builtin-apply.con commit submodule: use git rev-parse -q (30353a4)
   1/*
   2 * apply.c
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 *
   6 * This applies patches on top of some (arbitrary) version of the SCM.
   7 *
   8 */
   9#include "cache.h"
  10#include "cache-tree.h"
  11#include "quote.h"
  12#include "blob.h"
  13#include "delta.h"
  14#include "builtin.h"
  15#include "string-list.h"
  16#include "dir.h"
  17
  18/*
  19 *  --check turns on checking that the working tree matches the
  20 *    files that are being modified, but doesn't apply the patch
  21 *  --stat does just a diffstat, and doesn't actually apply
  22 *  --numstat does numeric diffstat, and doesn't actually apply
  23 *  --index-info shows the old and new index info for paths if available.
  24 *  --index updates the cache as well.
  25 *  --cached updates only the cache without ever touching the working tree.
  26 */
  27static const char *prefix;
  28static int prefix_length = -1;
  29static int newfd = -1;
  30
  31static int unidiff_zero;
  32static int p_value = 1;
  33static int p_value_known;
  34static int check_index;
  35static int update_index;
  36static int cached;
  37static int diffstat;
  38static int numstat;
  39static int summary;
  40static int check;
  41static int apply = 1;
  42static int apply_in_reverse;
  43static int apply_with_reject;
  44static int apply_verbosely;
  45static int no_add;
  46static const char *fake_ancestor;
  47static int line_termination = '\n';
  48static unsigned long p_context = ULONG_MAX;
  49static const char apply_usage[] =
  50"git apply [--stat] [--numstat] [--summary] [--check] [--index] [--cached] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [--reverse] [--reject] [--verbose] [-z] [-pNUM] [-CNUM] [--whitespace=<nowarn|warn|fix|error|error-all>] <patch>...";
  51
  52static enum ws_error_action {
  53        nowarn_ws_error,
  54        warn_on_ws_error,
  55        die_on_ws_error,
  56        correct_ws_error,
  57} ws_error_action = warn_on_ws_error;
  58static int whitespace_error;
  59static int squelch_whitespace_errors = 5;
  60static int applied_after_fixing_ws;
  61static const char *patch_input_file;
  62static const char *root;
  63static int root_len;
  64
  65static void parse_whitespace_option(const char *option)
  66{
  67        if (!option) {
  68                ws_error_action = warn_on_ws_error;
  69                return;
  70        }
  71        if (!strcmp(option, "warn")) {
  72                ws_error_action = warn_on_ws_error;
  73                return;
  74        }
  75        if (!strcmp(option, "nowarn")) {
  76                ws_error_action = nowarn_ws_error;
  77                return;
  78        }
  79        if (!strcmp(option, "error")) {
  80                ws_error_action = die_on_ws_error;
  81                return;
  82        }
  83        if (!strcmp(option, "error-all")) {
  84                ws_error_action = die_on_ws_error;
  85                squelch_whitespace_errors = 0;
  86                return;
  87        }
  88        if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
  89                ws_error_action = correct_ws_error;
  90                return;
  91        }
  92        die("unrecognized whitespace option '%s'", option);
  93}
  94
  95static void set_default_whitespace_mode(const char *whitespace_option)
  96{
  97        if (!whitespace_option && !apply_default_whitespace)
  98                ws_error_action = (apply ? warn_on_ws_error : nowarn_ws_error);
  99}
 100
 101/*
 102 * For "diff-stat" like behaviour, we keep track of the biggest change
 103 * we've seen, and the longest filename. That allows us to do simple
 104 * scaling.
 105 */
 106static int max_change, max_len;
 107
 108/*
 109 * Various "current state", notably line numbers and what
 110 * file (and how) we're patching right now.. The "is_xxxx"
 111 * things are flags, where -1 means "don't know yet".
 112 */
 113static int linenr = 1;
 114
 115/*
 116 * This represents one "hunk" from a patch, starting with
 117 * "@@ -oldpos,oldlines +newpos,newlines @@" marker.  The
 118 * patch text is pointed at by patch, and its byte length
 119 * is stored in size.  leading and trailing are the number
 120 * of context lines.
 121 */
 122struct fragment {
 123        unsigned long leading, trailing;
 124        unsigned long oldpos, oldlines;
 125        unsigned long newpos, newlines;
 126        const char *patch;
 127        int size;
 128        int rejected;
 129        struct fragment *next;
 130};
 131
 132/*
 133 * When dealing with a binary patch, we reuse "leading" field
 134 * to store the type of the binary hunk, either deflated "delta"
 135 * or deflated "literal".
 136 */
 137#define binary_patch_method leading
 138#define BINARY_DELTA_DEFLATED   1
 139#define BINARY_LITERAL_DEFLATED 2
 140
 141/*
 142 * This represents a "patch" to a file, both metainfo changes
 143 * such as creation/deletion, filemode and content changes represented
 144 * as a series of fragments.
 145 */
 146struct patch {
 147        char *new_name, *old_name, *def_name;
 148        unsigned int old_mode, new_mode;
 149        int is_new, is_delete;  /* -1 = unknown, 0 = false, 1 = true */
 150        int rejected;
 151        unsigned ws_rule;
 152        unsigned long deflate_origlen;
 153        int lines_added, lines_deleted;
 154        int score;
 155        unsigned int is_toplevel_relative:1;
 156        unsigned int inaccurate_eof:1;
 157        unsigned int is_binary:1;
 158        unsigned int is_copy:1;
 159        unsigned int is_rename:1;
 160        unsigned int recount:1;
 161        struct fragment *fragments;
 162        char *result;
 163        size_t resultsize;
 164        char old_sha1_prefix[41];
 165        char new_sha1_prefix[41];
 166        struct patch *next;
 167};
 168
 169/*
 170 * A line in a file, len-bytes long (includes the terminating LF,
 171 * except for an incomplete line at the end if the file ends with
 172 * one), and its contents hashes to 'hash'.
 173 */
 174struct line {
 175        size_t len;
 176        unsigned hash : 24;
 177        unsigned flag : 8;
 178#define LINE_COMMON     1
 179};
 180
 181/*
 182 * This represents a "file", which is an array of "lines".
 183 */
 184struct image {
 185        char *buf;
 186        size_t len;
 187        size_t nr;
 188        size_t alloc;
 189        struct line *line_allocated;
 190        struct line *line;
 191};
 192
 193/*
 194 * Records filenames that have been touched, in order to handle
 195 * the case where more than one patches touch the same file.
 196 */
 197
 198static struct string_list fn_table;
 199
 200static uint32_t hash_line(const char *cp, size_t len)
 201{
 202        size_t i;
 203        uint32_t h;
 204        for (i = 0, h = 0; i < len; i++) {
 205                if (!isspace(cp[i])) {
 206                        h = h * 3 + (cp[i] & 0xff);
 207                }
 208        }
 209        return h;
 210}
 211
 212static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
 213{
 214        ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
 215        img->line_allocated[img->nr].len = len;
 216        img->line_allocated[img->nr].hash = hash_line(bol, len);
 217        img->line_allocated[img->nr].flag = flag;
 218        img->nr++;
 219}
 220
 221static void prepare_image(struct image *image, char *buf, size_t len,
 222                          int prepare_linetable)
 223{
 224        const char *cp, *ep;
 225
 226        memset(image, 0, sizeof(*image));
 227        image->buf = buf;
 228        image->len = len;
 229
 230        if (!prepare_linetable)
 231                return;
 232
 233        ep = image->buf + image->len;
 234        cp = image->buf;
 235        while (cp < ep) {
 236                const char *next;
 237                for (next = cp; next < ep && *next != '\n'; next++)
 238                        ;
 239                if (next < ep)
 240                        next++;
 241                add_line_info(image, cp, next - cp, 0);
 242                cp = next;
 243        }
 244        image->line = image->line_allocated;
 245}
 246
 247static void clear_image(struct image *image)
 248{
 249        free(image->buf);
 250        image->buf = NULL;
 251        image->len = 0;
 252}
 253
 254static void say_patch_name(FILE *output, const char *pre,
 255                           struct patch *patch, const char *post)
 256{
 257        fputs(pre, output);
 258        if (patch->old_name && patch->new_name &&
 259            strcmp(patch->old_name, patch->new_name)) {
 260                quote_c_style(patch->old_name, NULL, output, 0);
 261                fputs(" => ", output);
 262                quote_c_style(patch->new_name, NULL, output, 0);
 263        } else {
 264                const char *n = patch->new_name;
 265                if (!n)
 266                        n = patch->old_name;
 267                quote_c_style(n, NULL, output, 0);
 268        }
 269        fputs(post, output);
 270}
 271
 272#define CHUNKSIZE (8192)
 273#define SLOP (16)
 274
 275static void read_patch_file(struct strbuf *sb, int fd)
 276{
 277        if (strbuf_read(sb, fd, 0) < 0)
 278                die("git apply: read returned %s", strerror(errno));
 279
 280        /*
 281         * Make sure that we have some slop in the buffer
 282         * so that we can do speculative "memcmp" etc, and
 283         * see to it that it is NUL-filled.
 284         */
 285        strbuf_grow(sb, SLOP);
 286        memset(sb->buf + sb->len, 0, SLOP);
 287}
 288
 289static unsigned long linelen(const char *buffer, unsigned long size)
 290{
 291        unsigned long len = 0;
 292        while (size--) {
 293                len++;
 294                if (*buffer++ == '\n')
 295                        break;
 296        }
 297        return len;
 298}
 299
 300static int is_dev_null(const char *str)
 301{
 302        return !memcmp("/dev/null", str, 9) && isspace(str[9]);
 303}
 304
 305#define TERM_SPACE      1
 306#define TERM_TAB        2
 307
 308static int name_terminate(const char *name, int namelen, int c, int terminate)
 309{
 310        if (c == ' ' && !(terminate & TERM_SPACE))
 311                return 0;
 312        if (c == '\t' && !(terminate & TERM_TAB))
 313                return 0;
 314
 315        return 1;
 316}
 317
 318static char *find_name(const char *line, char *def, int p_value, int terminate)
 319{
 320        int len;
 321        const char *start = line;
 322
 323        if (*line == '"') {
 324                struct strbuf name = STRBUF_INIT;
 325
 326                /*
 327                 * Proposed "new-style" GNU patch/diff format; see
 328                 * http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
 329                 */
 330                if (!unquote_c_style(&name, line, NULL)) {
 331                        char *cp;
 332
 333                        for (cp = name.buf; p_value; p_value--) {
 334                                cp = strchr(cp, '/');
 335                                if (!cp)
 336                                        break;
 337                                cp++;
 338                        }
 339                        if (cp) {
 340                                /* name can later be freed, so we need
 341                                 * to memmove, not just return cp
 342                                 */
 343                                strbuf_remove(&name, 0, cp - name.buf);
 344                                free(def);
 345                                if (root)
 346                                        strbuf_insert(&name, 0, root, root_len);
 347                                return strbuf_detach(&name, NULL);
 348                        }
 349                }
 350                strbuf_release(&name);
 351        }
 352
 353        for (;;) {
 354                char c = *line;
 355
 356                if (isspace(c)) {
 357                        if (c == '\n')
 358                                break;
 359                        if (name_terminate(start, line-start, c, terminate))
 360                                break;
 361                }
 362                line++;
 363                if (c == '/' && !--p_value)
 364                        start = line;
 365        }
 366        if (!start)
 367                return def;
 368        len = line - start;
 369        if (!len)
 370                return def;
 371
 372        /*
 373         * Generally we prefer the shorter name, especially
 374         * if the other one is just a variation of that with
 375         * something else tacked on to the end (ie "file.orig"
 376         * or "file~").
 377         */
 378        if (def) {
 379                int deflen = strlen(def);
 380                if (deflen < len && !strncmp(start, def, deflen))
 381                        return def;
 382                free(def);
 383        }
 384
 385        if (root) {
 386                char *ret = xmalloc(root_len + len + 1);
 387                strcpy(ret, root);
 388                memcpy(ret + root_len, start, len);
 389                ret[root_len + len] = '\0';
 390                return ret;
 391        }
 392
 393        return xmemdupz(start, len);
 394}
 395
 396static int count_slashes(const char *cp)
 397{
 398        int cnt = 0;
 399        char ch;
 400
 401        while ((ch = *cp++))
 402                if (ch == '/')
 403                        cnt++;
 404        return cnt;
 405}
 406
 407/*
 408 * Given the string after "--- " or "+++ ", guess the appropriate
 409 * p_value for the given patch.
 410 */
 411static int guess_p_value(const char *nameline)
 412{
 413        char *name, *cp;
 414        int val = -1;
 415
 416        if (is_dev_null(nameline))
 417                return -1;
 418        name = find_name(nameline, NULL, 0, TERM_SPACE | TERM_TAB);
 419        if (!name)
 420                return -1;
 421        cp = strchr(name, '/');
 422        if (!cp)
 423                val = 0;
 424        else if (prefix) {
 425                /*
 426                 * Does it begin with "a/$our-prefix" and such?  Then this is
 427                 * very likely to apply to our directory.
 428                 */
 429                if (!strncmp(name, prefix, prefix_length))
 430                        val = count_slashes(prefix);
 431                else {
 432                        cp++;
 433                        if (!strncmp(cp, prefix, prefix_length))
 434                                val = count_slashes(prefix) + 1;
 435                }
 436        }
 437        free(name);
 438        return val;
 439}
 440
 441/*
 442 * Get the name etc info from the ---/+++ lines of a traditional patch header
 443 *
 444 * FIXME! The end-of-filename heuristics are kind of screwy. For existing
 445 * files, we can happily check the index for a match, but for creating a
 446 * new file we should try to match whatever "patch" does. I have no idea.
 447 */
 448static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
 449{
 450        char *name;
 451
 452        first += 4;     /* skip "--- " */
 453        second += 4;    /* skip "+++ " */
 454        if (!p_value_known) {
 455                int p, q;
 456                p = guess_p_value(first);
 457                q = guess_p_value(second);
 458                if (p < 0) p = q;
 459                if (0 <= p && p == q) {
 460                        p_value = p;
 461                        p_value_known = 1;
 462                }
 463        }
 464        if (is_dev_null(first)) {
 465                patch->is_new = 1;
 466                patch->is_delete = 0;
 467                name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
 468                patch->new_name = name;
 469        } else if (is_dev_null(second)) {
 470                patch->is_new = 0;
 471                patch->is_delete = 1;
 472                name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
 473                patch->old_name = name;
 474        } else {
 475                name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
 476                name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
 477                patch->old_name = patch->new_name = name;
 478        }
 479        if (!name)
 480                die("unable to find filename in patch at line %d", linenr);
 481}
 482
 483static int gitdiff_hdrend(const char *line, struct patch *patch)
 484{
 485        return -1;
 486}
 487
 488/*
 489 * We're anal about diff header consistency, to make
 490 * sure that we don't end up having strange ambiguous
 491 * patches floating around.
 492 *
 493 * As a result, gitdiff_{old|new}name() will check
 494 * their names against any previous information, just
 495 * to make sure..
 496 */
 497static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
 498{
 499        if (!orig_name && !isnull)
 500                return find_name(line, NULL, p_value, TERM_TAB);
 501
 502        if (orig_name) {
 503                int len;
 504                const char *name;
 505                char *another;
 506                name = orig_name;
 507                len = strlen(name);
 508                if (isnull)
 509                        die("git apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
 510                another = find_name(line, NULL, p_value, TERM_TAB);
 511                if (!another || memcmp(another, name, len))
 512                        die("git apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
 513                free(another);
 514                return orig_name;
 515        }
 516        else {
 517                /* expect "/dev/null" */
 518                if (memcmp("/dev/null", line, 9) || line[9] != '\n')
 519                        die("git apply: bad git-diff - expected /dev/null on line %d", linenr);
 520                return NULL;
 521        }
 522}
 523
 524static int gitdiff_oldname(const char *line, struct patch *patch)
 525{
 526        patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
 527        return 0;
 528}
 529
 530static int gitdiff_newname(const char *line, struct patch *patch)
 531{
 532        patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
 533        return 0;
 534}
 535
 536static int gitdiff_oldmode(const char *line, struct patch *patch)
 537{
 538        patch->old_mode = strtoul(line, NULL, 8);
 539        return 0;
 540}
 541
 542static int gitdiff_newmode(const char *line, struct patch *patch)
 543{
 544        patch->new_mode = strtoul(line, NULL, 8);
 545        return 0;
 546}
 547
 548static int gitdiff_delete(const char *line, struct patch *patch)
 549{
 550        patch->is_delete = 1;
 551        patch->old_name = patch->def_name;
 552        return gitdiff_oldmode(line, patch);
 553}
 554
 555static int gitdiff_newfile(const char *line, struct patch *patch)
 556{
 557        patch->is_new = 1;
 558        patch->new_name = patch->def_name;
 559        return gitdiff_newmode(line, patch);
 560}
 561
 562static int gitdiff_copysrc(const char *line, struct patch *patch)
 563{
 564        patch->is_copy = 1;
 565        patch->old_name = find_name(line, NULL, 0, 0);
 566        return 0;
 567}
 568
 569static int gitdiff_copydst(const char *line, struct patch *patch)
 570{
 571        patch->is_copy = 1;
 572        patch->new_name = find_name(line, NULL, 0, 0);
 573        return 0;
 574}
 575
 576static int gitdiff_renamesrc(const char *line, struct patch *patch)
 577{
 578        patch->is_rename = 1;
 579        patch->old_name = find_name(line, NULL, 0, 0);
 580        return 0;
 581}
 582
 583static int gitdiff_renamedst(const char *line, struct patch *patch)
 584{
 585        patch->is_rename = 1;
 586        patch->new_name = find_name(line, NULL, 0, 0);
 587        return 0;
 588}
 589
 590static int gitdiff_similarity(const char *line, struct patch *patch)
 591{
 592        if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
 593                patch->score = 0;
 594        return 0;
 595}
 596
 597static int gitdiff_dissimilarity(const char *line, struct patch *patch)
 598{
 599        if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
 600                patch->score = 0;
 601        return 0;
 602}
 603
 604static int gitdiff_index(const char *line, struct patch *patch)
 605{
 606        /*
 607         * index line is N hexadecimal, "..", N hexadecimal,
 608         * and optional space with octal mode.
 609         */
 610        const char *ptr, *eol;
 611        int len;
 612
 613        ptr = strchr(line, '.');
 614        if (!ptr || ptr[1] != '.' || 40 < ptr - line)
 615                return 0;
 616        len = ptr - line;
 617        memcpy(patch->old_sha1_prefix, line, len);
 618        patch->old_sha1_prefix[len] = 0;
 619
 620        line = ptr + 2;
 621        ptr = strchr(line, ' ');
 622        eol = strchr(line, '\n');
 623
 624        if (!ptr || eol < ptr)
 625                ptr = eol;
 626        len = ptr - line;
 627
 628        if (40 < len)
 629                return 0;
 630        memcpy(patch->new_sha1_prefix, line, len);
 631        patch->new_sha1_prefix[len] = 0;
 632        if (*ptr == ' ')
 633                patch->new_mode = patch->old_mode = strtoul(ptr+1, NULL, 8);
 634        return 0;
 635}
 636
 637/*
 638 * This is normal for a diff that doesn't change anything: we'll fall through
 639 * into the next diff. Tell the parser to break out.
 640 */
 641static int gitdiff_unrecognized(const char *line, struct patch *patch)
 642{
 643        return -1;
 644}
 645
 646static const char *stop_at_slash(const char *line, int llen)
 647{
 648        int i;
 649
 650        for (i = 0; i < llen; i++) {
 651                int ch = line[i];
 652                if (ch == '/')
 653                        return line + i;
 654        }
 655        return NULL;
 656}
 657
 658/*
 659 * This is to extract the same name that appears on "diff --git"
 660 * line.  We do not find and return anything if it is a rename
 661 * patch, and it is OK because we will find the name elsewhere.
 662 * We need to reliably find name only when it is mode-change only,
 663 * creation or deletion of an empty file.  In any of these cases,
 664 * both sides are the same name under a/ and b/ respectively.
 665 */
 666static char *git_header_name(char *line, int llen)
 667{
 668        const char *name;
 669        const char *second = NULL;
 670        size_t len;
 671
 672        line += strlen("diff --git ");
 673        llen -= strlen("diff --git ");
 674
 675        if (*line == '"') {
 676                const char *cp;
 677                struct strbuf first = STRBUF_INIT;
 678                struct strbuf sp = STRBUF_INIT;
 679
 680                if (unquote_c_style(&first, line, &second))
 681                        goto free_and_fail1;
 682
 683                /* advance to the first slash */
 684                cp = stop_at_slash(first.buf, first.len);
 685                /* we do not accept absolute paths */
 686                if (!cp || cp == first.buf)
 687                        goto free_and_fail1;
 688                strbuf_remove(&first, 0, cp + 1 - first.buf);
 689
 690                /*
 691                 * second points at one past closing dq of name.
 692                 * find the second name.
 693                 */
 694                while ((second < line + llen) && isspace(*second))
 695                        second++;
 696
 697                if (line + llen <= second)
 698                        goto free_and_fail1;
 699                if (*second == '"') {
 700                        if (unquote_c_style(&sp, second, NULL))
 701                                goto free_and_fail1;
 702                        cp = stop_at_slash(sp.buf, sp.len);
 703                        if (!cp || cp == sp.buf)
 704                                goto free_and_fail1;
 705                        /* They must match, otherwise ignore */
 706                        if (strcmp(cp + 1, first.buf))
 707                                goto free_and_fail1;
 708                        strbuf_release(&sp);
 709                        return strbuf_detach(&first, NULL);
 710                }
 711
 712                /* unquoted second */
 713                cp = stop_at_slash(second, line + llen - second);
 714                if (!cp || cp == second)
 715                        goto free_and_fail1;
 716                cp++;
 717                if (line + llen - cp != first.len + 1 ||
 718                    memcmp(first.buf, cp, first.len))
 719                        goto free_and_fail1;
 720                return strbuf_detach(&first, NULL);
 721
 722        free_and_fail1:
 723                strbuf_release(&first);
 724                strbuf_release(&sp);
 725                return NULL;
 726        }
 727
 728        /* unquoted first name */
 729        name = stop_at_slash(line, llen);
 730        if (!name || name == line)
 731                return NULL;
 732        name++;
 733
 734        /*
 735         * since the first name is unquoted, a dq if exists must be
 736         * the beginning of the second name.
 737         */
 738        for (second = name; second < line + llen; second++) {
 739                if (*second == '"') {
 740                        struct strbuf sp = STRBUF_INIT;
 741                        const char *np;
 742
 743                        if (unquote_c_style(&sp, second, NULL))
 744                                goto free_and_fail2;
 745
 746                        np = stop_at_slash(sp.buf, sp.len);
 747                        if (!np || np == sp.buf)
 748                                goto free_and_fail2;
 749                        np++;
 750
 751                        len = sp.buf + sp.len - np;
 752                        if (len < second - name &&
 753                            !strncmp(np, name, len) &&
 754                            isspace(name[len])) {
 755                                /* Good */
 756                                strbuf_remove(&sp, 0, np - sp.buf);
 757                                return strbuf_detach(&sp, NULL);
 758                        }
 759
 760                free_and_fail2:
 761                        strbuf_release(&sp);
 762                        return NULL;
 763                }
 764        }
 765
 766        /*
 767         * Accept a name only if it shows up twice, exactly the same
 768         * form.
 769         */
 770        for (len = 0 ; ; len++) {
 771                switch (name[len]) {
 772                default:
 773                        continue;
 774                case '\n':
 775                        return NULL;
 776                case '\t': case ' ':
 777                        second = name+len;
 778                        for (;;) {
 779                                char c = *second++;
 780                                if (c == '\n')
 781                                        return NULL;
 782                                if (c == '/')
 783                                        break;
 784                        }
 785                        if (second[len] == '\n' && !memcmp(name, second, len)) {
 786                                return xmemdupz(name, len);
 787                        }
 788                }
 789        }
 790}
 791
 792/* Verify that we recognize the lines following a git header */
 793static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
 794{
 795        unsigned long offset;
 796
 797        /* A git diff has explicit new/delete information, so we don't guess */
 798        patch->is_new = 0;
 799        patch->is_delete = 0;
 800
 801        /*
 802         * Some things may not have the old name in the
 803         * rest of the headers anywhere (pure mode changes,
 804         * or removing or adding empty files), so we get
 805         * the default name from the header.
 806         */
 807        patch->def_name = git_header_name(line, len);
 808        if (patch->def_name && root) {
 809                char *s = xmalloc(root_len + strlen(patch->def_name) + 1);
 810                strcpy(s, root);
 811                strcpy(s + root_len, patch->def_name);
 812                free(patch->def_name);
 813                patch->def_name = s;
 814        }
 815
 816        line += len;
 817        size -= len;
 818        linenr++;
 819        for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
 820                static const struct opentry {
 821                        const char *str;
 822                        int (*fn)(const char *, struct patch *);
 823                } optable[] = {
 824                        { "@@ -", gitdiff_hdrend },
 825                        { "--- ", gitdiff_oldname },
 826                        { "+++ ", gitdiff_newname },
 827                        { "old mode ", gitdiff_oldmode },
 828                        { "new mode ", gitdiff_newmode },
 829                        { "deleted file mode ", gitdiff_delete },
 830                        { "new file mode ", gitdiff_newfile },
 831                        { "copy from ", gitdiff_copysrc },
 832                        { "copy to ", gitdiff_copydst },
 833                        { "rename old ", gitdiff_renamesrc },
 834                        { "rename new ", gitdiff_renamedst },
 835                        { "rename from ", gitdiff_renamesrc },
 836                        { "rename to ", gitdiff_renamedst },
 837                        { "similarity index ", gitdiff_similarity },
 838                        { "dissimilarity index ", gitdiff_dissimilarity },
 839                        { "index ", gitdiff_index },
 840                        { "", gitdiff_unrecognized },
 841                };
 842                int i;
 843
 844                len = linelen(line, size);
 845                if (!len || line[len-1] != '\n')
 846                        break;
 847                for (i = 0; i < ARRAY_SIZE(optable); i++) {
 848                        const struct opentry *p = optable + i;
 849                        int oplen = strlen(p->str);
 850                        if (len < oplen || memcmp(p->str, line, oplen))
 851                                continue;
 852                        if (p->fn(line + oplen, patch) < 0)
 853                                return offset;
 854                        break;
 855                }
 856        }
 857
 858        return offset;
 859}
 860
 861static int parse_num(const char *line, unsigned long *p)
 862{
 863        char *ptr;
 864
 865        if (!isdigit(*line))
 866                return 0;
 867        *p = strtoul(line, &ptr, 10);
 868        return ptr - line;
 869}
 870
 871static int parse_range(const char *line, int len, int offset, const char *expect,
 872                       unsigned long *p1, unsigned long *p2)
 873{
 874        int digits, ex;
 875
 876        if (offset < 0 || offset >= len)
 877                return -1;
 878        line += offset;
 879        len -= offset;
 880
 881        digits = parse_num(line, p1);
 882        if (!digits)
 883                return -1;
 884
 885        offset += digits;
 886        line += digits;
 887        len -= digits;
 888
 889        *p2 = 1;
 890        if (*line == ',') {
 891                digits = parse_num(line+1, p2);
 892                if (!digits)
 893                        return -1;
 894
 895                offset += digits+1;
 896                line += digits+1;
 897                len -= digits+1;
 898        }
 899
 900        ex = strlen(expect);
 901        if (ex > len)
 902                return -1;
 903        if (memcmp(line, expect, ex))
 904                return -1;
 905
 906        return offset + ex;
 907}
 908
 909static void recount_diff(char *line, int size, struct fragment *fragment)
 910{
 911        int oldlines = 0, newlines = 0, ret = 0;
 912
 913        if (size < 1) {
 914                warning("recount: ignore empty hunk");
 915                return;
 916        }
 917
 918        for (;;) {
 919                int len = linelen(line, size);
 920                size -= len;
 921                line += len;
 922
 923                if (size < 1)
 924                        break;
 925
 926                switch (*line) {
 927                case ' ': case '\n':
 928                        newlines++;
 929                        /* fall through */
 930                case '-':
 931                        oldlines++;
 932                        continue;
 933                case '+':
 934                        newlines++;
 935                        continue;
 936                case '\\':
 937                        continue;
 938                case '@':
 939                        ret = size < 3 || prefixcmp(line, "@@ ");
 940                        break;
 941                case 'd':
 942                        ret = size < 5 || prefixcmp(line, "diff ");
 943                        break;
 944                default:
 945                        ret = -1;
 946                        break;
 947                }
 948                if (ret) {
 949                        warning("recount: unexpected line: %.*s",
 950                                (int)linelen(line, size), line);
 951                        return;
 952                }
 953                break;
 954        }
 955        fragment->oldlines = oldlines;
 956        fragment->newlines = newlines;
 957}
 958
 959/*
 960 * Parse a unified diff fragment header of the
 961 * form "@@ -a,b +c,d @@"
 962 */
 963static int parse_fragment_header(char *line, int len, struct fragment *fragment)
 964{
 965        int offset;
 966
 967        if (!len || line[len-1] != '\n')
 968                return -1;
 969
 970        /* Figure out the number of lines in a fragment */
 971        offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
 972        offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
 973
 974        return offset;
 975}
 976
 977static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
 978{
 979        unsigned long offset, len;
 980
 981        patch->is_toplevel_relative = 0;
 982        patch->is_rename = patch->is_copy = 0;
 983        patch->is_new = patch->is_delete = -1;
 984        patch->old_mode = patch->new_mode = 0;
 985        patch->old_name = patch->new_name = NULL;
 986        for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
 987                unsigned long nextlen;
 988
 989                len = linelen(line, size);
 990                if (!len)
 991                        break;
 992
 993                /* Testing this early allows us to take a few shortcuts.. */
 994                if (len < 6)
 995                        continue;
 996
 997                /*
 998                 * Make sure we don't find any unconnected patch fragments.
 999                 * That's a sign that we didn't find a header, and that a
1000                 * patch has become corrupted/broken up.
1001                 */
1002                if (!memcmp("@@ -", line, 4)) {
1003                        struct fragment dummy;
1004                        if (parse_fragment_header(line, len, &dummy) < 0)
1005                                continue;
1006                        die("patch fragment without header at line %d: %.*s",
1007                            linenr, (int)len-1, line);
1008                }
1009
1010                if (size < len + 6)
1011                        break;
1012
1013                /*
1014                 * Git patch? It might not have a real patch, just a rename
1015                 * or mode change, so we handle that specially
1016                 */
1017                if (!memcmp("diff --git ", line, 11)) {
1018                        int git_hdr_len = parse_git_header(line, len, size, patch);
1019                        if (git_hdr_len <= len)
1020                                continue;
1021                        if (!patch->old_name && !patch->new_name) {
1022                                if (!patch->def_name)
1023                                        die("git diff header lacks filename information (line %d)", linenr);
1024                                patch->old_name = patch->new_name = patch->def_name;
1025                        }
1026                        patch->is_toplevel_relative = 1;
1027                        *hdrsize = git_hdr_len;
1028                        return offset;
1029                }
1030
1031                /* --- followed by +++ ? */
1032                if (memcmp("--- ", line,  4) || memcmp("+++ ", line + len, 4))
1033                        continue;
1034
1035                /*
1036                 * We only accept unified patches, so we want it to
1037                 * at least have "@@ -a,b +c,d @@\n", which is 14 chars
1038                 * minimum ("@@ -0,0 +1 @@\n" is the shortest).
1039                 */
1040                nextlen = linelen(line + len, size - len);
1041                if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
1042                        continue;
1043
1044                /* Ok, we'll consider it a patch */
1045                parse_traditional_patch(line, line+len, patch);
1046                *hdrsize = len + nextlen;
1047                linenr += 2;
1048                return offset;
1049        }
1050        return -1;
1051}
1052
1053static void check_whitespace(const char *line, int len, unsigned ws_rule)
1054{
1055        char *err;
1056        unsigned result = ws_check(line + 1, len - 1, ws_rule);
1057        if (!result)
1058                return;
1059
1060        whitespace_error++;
1061        if (squelch_whitespace_errors &&
1062            squelch_whitespace_errors < whitespace_error)
1063                ;
1064        else {
1065                err = whitespace_error_string(result);
1066                fprintf(stderr, "%s:%d: %s.\n%.*s\n",
1067                        patch_input_file, linenr, err, len - 2, line + 1);
1068                free(err);
1069        }
1070}
1071
1072/*
1073 * Parse a unified diff. Note that this really needs to parse each
1074 * fragment separately, since the only way to know the difference
1075 * between a "---" that is part of a patch, and a "---" that starts
1076 * the next patch is to look at the line counts..
1077 */
1078static int parse_fragment(char *line, unsigned long size,
1079                          struct patch *patch, struct fragment *fragment)
1080{
1081        int added, deleted;
1082        int len = linelen(line, size), offset;
1083        unsigned long oldlines, newlines;
1084        unsigned long leading, trailing;
1085
1086        offset = parse_fragment_header(line, len, fragment);
1087        if (offset < 0)
1088                return -1;
1089        if (offset > 0 && patch->recount)
1090                recount_diff(line + offset, size - offset, fragment);
1091        oldlines = fragment->oldlines;
1092        newlines = fragment->newlines;
1093        leading = 0;
1094        trailing = 0;
1095
1096        /* Parse the thing.. */
1097        line += len;
1098        size -= len;
1099        linenr++;
1100        added = deleted = 0;
1101        for (offset = len;
1102             0 < size;
1103             offset += len, size -= len, line += len, linenr++) {
1104                if (!oldlines && !newlines)
1105                        break;
1106                len = linelen(line, size);
1107                if (!len || line[len-1] != '\n')
1108                        return -1;
1109                switch (*line) {
1110                default:
1111                        return -1;
1112                case '\n': /* newer GNU diff, an empty context line */
1113                case ' ':
1114                        oldlines--;
1115                        newlines--;
1116                        if (!deleted && !added)
1117                                leading++;
1118                        trailing++;
1119                        break;
1120                case '-':
1121                        if (apply_in_reverse &&
1122                            ws_error_action != nowarn_ws_error)
1123                                check_whitespace(line, len, patch->ws_rule);
1124                        deleted++;
1125                        oldlines--;
1126                        trailing = 0;
1127                        break;
1128                case '+':
1129                        if (!apply_in_reverse &&
1130                            ws_error_action != nowarn_ws_error)
1131                                check_whitespace(line, len, patch->ws_rule);
1132                        added++;
1133                        newlines--;
1134                        trailing = 0;
1135                        break;
1136
1137                /*
1138                 * We allow "\ No newline at end of file". Depending
1139                 * on locale settings when the patch was produced we
1140                 * don't know what this line looks like. The only
1141                 * thing we do know is that it begins with "\ ".
1142                 * Checking for 12 is just for sanity check -- any
1143                 * l10n of "\ No newline..." is at least that long.
1144                 */
1145                case '\\':
1146                        if (len < 12 || memcmp(line, "\\ ", 2))
1147                                return -1;
1148                        break;
1149                }
1150        }
1151        if (oldlines || newlines)
1152                return -1;
1153        fragment->leading = leading;
1154        fragment->trailing = trailing;
1155
1156        /*
1157         * If a fragment ends with an incomplete line, we failed to include
1158         * it in the above loop because we hit oldlines == newlines == 0
1159         * before seeing it.
1160         */
1161        if (12 < size && !memcmp(line, "\\ ", 2))
1162                offset += linelen(line, size);
1163
1164        patch->lines_added += added;
1165        patch->lines_deleted += deleted;
1166
1167        if (0 < patch->is_new && oldlines)
1168                return error("new file depends on old contents");
1169        if (0 < patch->is_delete && newlines)
1170                return error("deleted file still has contents");
1171        return offset;
1172}
1173
1174static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
1175{
1176        unsigned long offset = 0;
1177        unsigned long oldlines = 0, newlines = 0, context = 0;
1178        struct fragment **fragp = &patch->fragments;
1179
1180        while (size > 4 && !memcmp(line, "@@ -", 4)) {
1181                struct fragment *fragment;
1182                int len;
1183
1184                fragment = xcalloc(1, sizeof(*fragment));
1185                len = parse_fragment(line, size, patch, fragment);
1186                if (len <= 0)
1187                        die("corrupt patch at line %d", linenr);
1188                fragment->patch = line;
1189                fragment->size = len;
1190                oldlines += fragment->oldlines;
1191                newlines += fragment->newlines;
1192                context += fragment->leading + fragment->trailing;
1193
1194                *fragp = fragment;
1195                fragp = &fragment->next;
1196
1197                offset += len;
1198                line += len;
1199                size -= len;
1200        }
1201
1202        /*
1203         * If something was removed (i.e. we have old-lines) it cannot
1204         * be creation, and if something was added it cannot be
1205         * deletion.  However, the reverse is not true; --unified=0
1206         * patches that only add are not necessarily creation even
1207         * though they do not have any old lines, and ones that only
1208         * delete are not necessarily deletion.
1209         *
1210         * Unfortunately, a real creation/deletion patch do _not_ have
1211         * any context line by definition, so we cannot safely tell it
1212         * apart with --unified=0 insanity.  At least if the patch has
1213         * more than one hunk it is not creation or deletion.
1214         */
1215        if (patch->is_new < 0 &&
1216            (oldlines || (patch->fragments && patch->fragments->next)))
1217                patch->is_new = 0;
1218        if (patch->is_delete < 0 &&
1219            (newlines || (patch->fragments && patch->fragments->next)))
1220                patch->is_delete = 0;
1221
1222        if (0 < patch->is_new && oldlines)
1223                die("new file %s depends on old contents", patch->new_name);
1224        if (0 < patch->is_delete && newlines)
1225                die("deleted file %s still has contents", patch->old_name);
1226        if (!patch->is_delete && !newlines && context)
1227                fprintf(stderr, "** warning: file %s becomes empty but "
1228                        "is not deleted\n", patch->new_name);
1229
1230        return offset;
1231}
1232
1233static inline int metadata_changes(struct patch *patch)
1234{
1235        return  patch->is_rename > 0 ||
1236                patch->is_copy > 0 ||
1237                patch->is_new > 0 ||
1238                patch->is_delete ||
1239                (patch->old_mode && patch->new_mode &&
1240                 patch->old_mode != patch->new_mode);
1241}
1242
1243static char *inflate_it(const void *data, unsigned long size,
1244                        unsigned long inflated_size)
1245{
1246        z_stream stream;
1247        void *out;
1248        int st;
1249
1250        memset(&stream, 0, sizeof(stream));
1251
1252        stream.next_in = (unsigned char *)data;
1253        stream.avail_in = size;
1254        stream.next_out = out = xmalloc(inflated_size);
1255        stream.avail_out = inflated_size;
1256        inflateInit(&stream);
1257        st = inflate(&stream, Z_FINISH);
1258        if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
1259                free(out);
1260                return NULL;
1261        }
1262        return out;
1263}
1264
1265static struct fragment *parse_binary_hunk(char **buf_p,
1266                                          unsigned long *sz_p,
1267                                          int *status_p,
1268                                          int *used_p)
1269{
1270        /*
1271         * Expect a line that begins with binary patch method ("literal"
1272         * or "delta"), followed by the length of data before deflating.
1273         * a sequence of 'length-byte' followed by base-85 encoded data
1274         * should follow, terminated by a newline.
1275         *
1276         * Each 5-byte sequence of base-85 encodes up to 4 bytes,
1277         * and we would limit the patch line to 66 characters,
1278         * so one line can fit up to 13 groups that would decode
1279         * to 52 bytes max.  The length byte 'A'-'Z' corresponds
1280         * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
1281         */
1282        int llen, used;
1283        unsigned long size = *sz_p;
1284        char *buffer = *buf_p;
1285        int patch_method;
1286        unsigned long origlen;
1287        char *data = NULL;
1288        int hunk_size = 0;
1289        struct fragment *frag;
1290
1291        llen = linelen(buffer, size);
1292        used = llen;
1293
1294        *status_p = 0;
1295
1296        if (!prefixcmp(buffer, "delta ")) {
1297                patch_method = BINARY_DELTA_DEFLATED;
1298                origlen = strtoul(buffer + 6, NULL, 10);
1299        }
1300        else if (!prefixcmp(buffer, "literal ")) {
1301                patch_method = BINARY_LITERAL_DEFLATED;
1302                origlen = strtoul(buffer + 8, NULL, 10);
1303        }
1304        else
1305                return NULL;
1306
1307        linenr++;
1308        buffer += llen;
1309        while (1) {
1310                int byte_length, max_byte_length, newsize;
1311                llen = linelen(buffer, size);
1312                used += llen;
1313                linenr++;
1314                if (llen == 1) {
1315                        /* consume the blank line */
1316                        buffer++;
1317                        size--;
1318                        break;
1319                }
1320                /*
1321                 * Minimum line is "A00000\n" which is 7-byte long,
1322                 * and the line length must be multiple of 5 plus 2.
1323                 */
1324                if ((llen < 7) || (llen-2) % 5)
1325                        goto corrupt;
1326                max_byte_length = (llen - 2) / 5 * 4;
1327                byte_length = *buffer;
1328                if ('A' <= byte_length && byte_length <= 'Z')
1329                        byte_length = byte_length - 'A' + 1;
1330                else if ('a' <= byte_length && byte_length <= 'z')
1331                        byte_length = byte_length - 'a' + 27;
1332                else
1333                        goto corrupt;
1334                /* if the input length was not multiple of 4, we would
1335                 * have filler at the end but the filler should never
1336                 * exceed 3 bytes
1337                 */
1338                if (max_byte_length < byte_length ||
1339                    byte_length <= max_byte_length - 4)
1340                        goto corrupt;
1341                newsize = hunk_size + byte_length;
1342                data = xrealloc(data, newsize);
1343                if (decode_85(data + hunk_size, buffer + 1, byte_length))
1344                        goto corrupt;
1345                hunk_size = newsize;
1346                buffer += llen;
1347                size -= llen;
1348        }
1349
1350        frag = xcalloc(1, sizeof(*frag));
1351        frag->patch = inflate_it(data, hunk_size, origlen);
1352        if (!frag->patch)
1353                goto corrupt;
1354        free(data);
1355        frag->size = origlen;
1356        *buf_p = buffer;
1357        *sz_p = size;
1358        *used_p = used;
1359        frag->binary_patch_method = patch_method;
1360        return frag;
1361
1362 corrupt:
1363        free(data);
1364        *status_p = -1;
1365        error("corrupt binary patch at line %d: %.*s",
1366              linenr-1, llen-1, buffer);
1367        return NULL;
1368}
1369
1370static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
1371{
1372        /*
1373         * We have read "GIT binary patch\n"; what follows is a line
1374         * that says the patch method (currently, either "literal" or
1375         * "delta") and the length of data before deflating; a
1376         * sequence of 'length-byte' followed by base-85 encoded data
1377         * follows.
1378         *
1379         * When a binary patch is reversible, there is another binary
1380         * hunk in the same format, starting with patch method (either
1381         * "literal" or "delta") with the length of data, and a sequence
1382         * of length-byte + base-85 encoded data, terminated with another
1383         * empty line.  This data, when applied to the postimage, produces
1384         * the preimage.
1385         */
1386        struct fragment *forward;
1387        struct fragment *reverse;
1388        int status;
1389        int used, used_1;
1390
1391        forward = parse_binary_hunk(&buffer, &size, &status, &used);
1392        if (!forward && !status)
1393                /* there has to be one hunk (forward hunk) */
1394                return error("unrecognized binary patch at line %d", linenr-1);
1395        if (status)
1396                /* otherwise we already gave an error message */
1397                return status;
1398
1399        reverse = parse_binary_hunk(&buffer, &size, &status, &used_1);
1400        if (reverse)
1401                used += used_1;
1402        else if (status) {
1403                /*
1404                 * Not having reverse hunk is not an error, but having
1405                 * a corrupt reverse hunk is.
1406                 */
1407                free((void*) forward->patch);
1408                free(forward);
1409                return status;
1410        }
1411        forward->next = reverse;
1412        patch->fragments = forward;
1413        patch->is_binary = 1;
1414        return used;
1415}
1416
1417static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
1418{
1419        int hdrsize, patchsize;
1420        int offset = find_header(buffer, size, &hdrsize, patch);
1421
1422        if (offset < 0)
1423                return offset;
1424
1425        patch->ws_rule = whitespace_rule(patch->new_name
1426                                         ? patch->new_name
1427                                         : patch->old_name);
1428
1429        patchsize = parse_single_patch(buffer + offset + hdrsize,
1430                                       size - offset - hdrsize, patch);
1431
1432        if (!patchsize) {
1433                static const char *binhdr[] = {
1434                        "Binary files ",
1435                        "Files ",
1436                        NULL,
1437                };
1438                static const char git_binary[] = "GIT binary patch\n";
1439                int i;
1440                int hd = hdrsize + offset;
1441                unsigned long llen = linelen(buffer + hd, size - hd);
1442
1443                if (llen == sizeof(git_binary) - 1 &&
1444                    !memcmp(git_binary, buffer + hd, llen)) {
1445                        int used;
1446                        linenr++;
1447                        used = parse_binary(buffer + hd + llen,
1448                                            size - hd - llen, patch);
1449                        if (used)
1450                                patchsize = used + llen;
1451                        else
1452                                patchsize = 0;
1453                }
1454                else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
1455                        for (i = 0; binhdr[i]; i++) {
1456                                int len = strlen(binhdr[i]);
1457                                if (len < size - hd &&
1458                                    !memcmp(binhdr[i], buffer + hd, len)) {
1459                                        linenr++;
1460                                        patch->is_binary = 1;
1461                                        patchsize = llen;
1462                                        break;
1463                                }
1464                        }
1465                }
1466
1467                /* Empty patch cannot be applied if it is a text patch
1468                 * without metadata change.  A binary patch appears
1469                 * empty to us here.
1470                 */
1471                if ((apply || check) &&
1472                    (!patch->is_binary && !metadata_changes(patch)))
1473                        die("patch with only garbage at line %d", linenr);
1474        }
1475
1476        return offset + hdrsize + patchsize;
1477}
1478
1479#define swap(a,b) myswap((a),(b),sizeof(a))
1480
1481#define myswap(a, b, size) do {         \
1482        unsigned char mytmp[size];      \
1483        memcpy(mytmp, &a, size);                \
1484        memcpy(&a, &b, size);           \
1485        memcpy(&b, mytmp, size);                \
1486} while (0)
1487
1488static void reverse_patches(struct patch *p)
1489{
1490        for (; p; p = p->next) {
1491                struct fragment *frag = p->fragments;
1492
1493                swap(p->new_name, p->old_name);
1494                swap(p->new_mode, p->old_mode);
1495                swap(p->is_new, p->is_delete);
1496                swap(p->lines_added, p->lines_deleted);
1497                swap(p->old_sha1_prefix, p->new_sha1_prefix);
1498
1499                for (; frag; frag = frag->next) {
1500                        swap(frag->newpos, frag->oldpos);
1501                        swap(frag->newlines, frag->oldlines);
1502                }
1503        }
1504}
1505
1506static const char pluses[] =
1507"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
1508static const char minuses[]=
1509"----------------------------------------------------------------------";
1510
1511static void show_stats(struct patch *patch)
1512{
1513        struct strbuf qname = STRBUF_INIT;
1514        char *cp = patch->new_name ? patch->new_name : patch->old_name;
1515        int max, add, del;
1516
1517        quote_c_style(cp, &qname, NULL, 0);
1518
1519        /*
1520         * "scale" the filename
1521         */
1522        max = max_len;
1523        if (max > 50)
1524                max = 50;
1525
1526        if (qname.len > max) {
1527                cp = strchr(qname.buf + qname.len + 3 - max, '/');
1528                if (!cp)
1529                        cp = qname.buf + qname.len + 3 - max;
1530                strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
1531        }
1532
1533        if (patch->is_binary) {
1534                printf(" %-*s |  Bin\n", max, qname.buf);
1535                strbuf_release(&qname);
1536                return;
1537        }
1538
1539        printf(" %-*s |", max, qname.buf);
1540        strbuf_release(&qname);
1541
1542        /*
1543         * scale the add/delete
1544         */
1545        max = max + max_change > 70 ? 70 - max : max_change;
1546        add = patch->lines_added;
1547        del = patch->lines_deleted;
1548
1549        if (max_change > 0) {
1550                int total = ((add + del) * max + max_change / 2) / max_change;
1551                add = (add * max + max_change / 2) / max_change;
1552                del = total - add;
1553        }
1554        printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
1555                add, pluses, del, minuses);
1556}
1557
1558static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
1559{
1560        switch (st->st_mode & S_IFMT) {
1561        case S_IFLNK:
1562                strbuf_grow(buf, st->st_size);
1563                if (readlink(path, buf->buf, st->st_size) != st->st_size)
1564                        return -1;
1565                strbuf_setlen(buf, st->st_size);
1566                return 0;
1567        case S_IFREG:
1568                if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
1569                        return error("unable to open or read %s", path);
1570                convert_to_git(path, buf->buf, buf->len, buf, 0);
1571                return 0;
1572        default:
1573                return -1;
1574        }
1575}
1576
1577static void update_pre_post_images(struct image *preimage,
1578                                   struct image *postimage,
1579                                   char *buf,
1580                                   size_t len)
1581{
1582        int i, ctx;
1583        char *new, *old, *fixed;
1584        struct image fixed_preimage;
1585
1586        /*
1587         * Update the preimage with whitespace fixes.  Note that we
1588         * are not losing preimage->buf -- apply_one_fragment() will
1589         * free "oldlines".
1590         */
1591        prepare_image(&fixed_preimage, buf, len, 1);
1592        assert(fixed_preimage.nr == preimage->nr);
1593        for (i = 0; i < preimage->nr; i++)
1594                fixed_preimage.line[i].flag = preimage->line[i].flag;
1595        free(preimage->line_allocated);
1596        *preimage = fixed_preimage;
1597
1598        /*
1599         * Adjust the common context lines in postimage, in place.
1600         * This is possible because whitespace fixing does not make
1601         * the string grow.
1602         */
1603        new = old = postimage->buf;
1604        fixed = preimage->buf;
1605        for (i = ctx = 0; i < postimage->nr; i++) {
1606                size_t len = postimage->line[i].len;
1607                if (!(postimage->line[i].flag & LINE_COMMON)) {
1608                        /* an added line -- no counterparts in preimage */
1609                        memmove(new, old, len);
1610                        old += len;
1611                        new += len;
1612                        continue;
1613                }
1614
1615                /* a common context -- skip it in the original postimage */
1616                old += len;
1617
1618                /* and find the corresponding one in the fixed preimage */
1619                while (ctx < preimage->nr &&
1620                       !(preimage->line[ctx].flag & LINE_COMMON)) {
1621                        fixed += preimage->line[ctx].len;
1622                        ctx++;
1623                }
1624                if (preimage->nr <= ctx)
1625                        die("oops");
1626
1627                /* and copy it in, while fixing the line length */
1628                len = preimage->line[ctx].len;
1629                memcpy(new, fixed, len);
1630                new += len;
1631                fixed += len;
1632                postimage->line[i].len = len;
1633                ctx++;
1634        }
1635
1636        /* Fix the length of the whole thing */
1637        postimage->len = new - postimage->buf;
1638}
1639
1640static int match_fragment(struct image *img,
1641                          struct image *preimage,
1642                          struct image *postimage,
1643                          unsigned long try,
1644                          int try_lno,
1645                          unsigned ws_rule,
1646                          int match_beginning, int match_end)
1647{
1648        int i;
1649        char *fixed_buf, *buf, *orig, *target;
1650
1651        if (preimage->nr + try_lno > img->nr)
1652                return 0;
1653
1654        if (match_beginning && try_lno)
1655                return 0;
1656
1657        if (match_end && preimage->nr + try_lno != img->nr)
1658                return 0;
1659
1660        /* Quick hash check */
1661        for (i = 0; i < preimage->nr; i++)
1662                if (preimage->line[i].hash != img->line[try_lno + i].hash)
1663                        return 0;
1664
1665        /*
1666         * Do we have an exact match?  If we were told to match
1667         * at the end, size must be exactly at try+fragsize,
1668         * otherwise try+fragsize must be still within the preimage,
1669         * and either case, the old piece should match the preimage
1670         * exactly.
1671         */
1672        if ((match_end
1673             ? (try + preimage->len == img->len)
1674             : (try + preimage->len <= img->len)) &&
1675            !memcmp(img->buf + try, preimage->buf, preimage->len))
1676                return 1;
1677
1678        if (ws_error_action != correct_ws_error)
1679                return 0;
1680
1681        /*
1682         * The hunk does not apply byte-by-byte, but the hash says
1683         * it might with whitespace fuzz.
1684         */
1685        fixed_buf = xmalloc(preimage->len + 1);
1686        buf = fixed_buf;
1687        orig = preimage->buf;
1688        target = img->buf + try;
1689        for (i = 0; i < preimage->nr; i++) {
1690                size_t fixlen; /* length after fixing the preimage */
1691                size_t oldlen = preimage->line[i].len;
1692                size_t tgtlen = img->line[try_lno + i].len;
1693                size_t tgtfixlen; /* length after fixing the target line */
1694                char tgtfixbuf[1024], *tgtfix;
1695                int match;
1696
1697                /* Try fixing the line in the preimage */
1698                fixlen = ws_fix_copy(buf, orig, oldlen, ws_rule, NULL);
1699
1700                /* Try fixing the line in the target */
1701                if (sizeof(tgtfixbuf) > tgtlen)
1702                        tgtfix = tgtfixbuf;
1703                else
1704                        tgtfix = xmalloc(tgtlen);
1705                tgtfixlen = ws_fix_copy(tgtfix, target, tgtlen, ws_rule, NULL);
1706
1707                /*
1708                 * If they match, either the preimage was based on
1709                 * a version before our tree fixed whitespace breakage,
1710                 * or we are lacking a whitespace-fix patch the tree
1711                 * the preimage was based on already had (i.e. target
1712                 * has whitespace breakage, the preimage doesn't).
1713                 * In either case, we are fixing the whitespace breakages
1714                 * so we might as well take the fix together with their
1715                 * real change.
1716                 */
1717                match = (tgtfixlen == fixlen && !memcmp(tgtfix, buf, fixlen));
1718
1719                if (tgtfix != tgtfixbuf)
1720                        free(tgtfix);
1721                if (!match)
1722                        goto unmatch_exit;
1723
1724                orig += oldlen;
1725                buf += fixlen;
1726                target += tgtlen;
1727        }
1728
1729        /*
1730         * Yes, the preimage is based on an older version that still
1731         * has whitespace breakages unfixed, and fixing them makes the
1732         * hunk match.  Update the context lines in the postimage.
1733         */
1734        update_pre_post_images(preimage, postimage,
1735                               fixed_buf, buf - fixed_buf);
1736        return 1;
1737
1738 unmatch_exit:
1739        free(fixed_buf);
1740        return 0;
1741}
1742
1743static int find_pos(struct image *img,
1744                    struct image *preimage,
1745                    struct image *postimage,
1746                    int line,
1747                    unsigned ws_rule,
1748                    int match_beginning, int match_end)
1749{
1750        int i;
1751        unsigned long backwards, forwards, try;
1752        int backwards_lno, forwards_lno, try_lno;
1753
1754        if (preimage->nr > img->nr)
1755                return -1;
1756
1757        /*
1758         * If match_begining or match_end is specified, there is no
1759         * point starting from a wrong line that will never match and
1760         * wander around and wait for a match at the specified end.
1761         */
1762        if (match_beginning)
1763                line = 0;
1764        else if (match_end)
1765                line = img->nr - preimage->nr;
1766
1767        if (line > img->nr)
1768                line = img->nr;
1769
1770        try = 0;
1771        for (i = 0; i < line; i++)
1772                try += img->line[i].len;
1773
1774        /*
1775         * There's probably some smart way to do this, but I'll leave
1776         * that to the smart and beautiful people. I'm simple and stupid.
1777         */
1778        backwards = try;
1779        backwards_lno = line;
1780        forwards = try;
1781        forwards_lno = line;
1782        try_lno = line;
1783
1784        for (i = 0; ; i++) {
1785                if (match_fragment(img, preimage, postimage,
1786                                   try, try_lno, ws_rule,
1787                                   match_beginning, match_end))
1788                        return try_lno;
1789
1790        again:
1791                if (backwards_lno == 0 && forwards_lno == img->nr)
1792                        break;
1793
1794                if (i & 1) {
1795                        if (backwards_lno == 0) {
1796                                i++;
1797                                goto again;
1798                        }
1799                        backwards_lno--;
1800                        backwards -= img->line[backwards_lno].len;
1801                        try = backwards;
1802                        try_lno = backwards_lno;
1803                } else {
1804                        if (forwards_lno == img->nr) {
1805                                i++;
1806                                goto again;
1807                        }
1808                        forwards += img->line[forwards_lno].len;
1809                        forwards_lno++;
1810                        try = forwards;
1811                        try_lno = forwards_lno;
1812                }
1813
1814        }
1815        return -1;
1816}
1817
1818static void remove_first_line(struct image *img)
1819{
1820        img->buf += img->line[0].len;
1821        img->len -= img->line[0].len;
1822        img->line++;
1823        img->nr--;
1824}
1825
1826static void remove_last_line(struct image *img)
1827{
1828        img->len -= img->line[--img->nr].len;
1829}
1830
1831static void update_image(struct image *img,
1832                         int applied_pos,
1833                         struct image *preimage,
1834                         struct image *postimage)
1835{
1836        /*
1837         * remove the copy of preimage at offset in img
1838         * and replace it with postimage
1839         */
1840        int i, nr;
1841        size_t remove_count, insert_count, applied_at = 0;
1842        char *result;
1843
1844        for (i = 0; i < applied_pos; i++)
1845                applied_at += img->line[i].len;
1846
1847        remove_count = 0;
1848        for (i = 0; i < preimage->nr; i++)
1849                remove_count += img->line[applied_pos + i].len;
1850        insert_count = postimage->len;
1851
1852        /* Adjust the contents */
1853        result = xmalloc(img->len + insert_count - remove_count + 1);
1854        memcpy(result, img->buf, applied_at);
1855        memcpy(result + applied_at, postimage->buf, postimage->len);
1856        memcpy(result + applied_at + postimage->len,
1857               img->buf + (applied_at + remove_count),
1858               img->len - (applied_at + remove_count));
1859        free(img->buf);
1860        img->buf = result;
1861        img->len += insert_count - remove_count;
1862        result[img->len] = '\0';
1863
1864        /* Adjust the line table */
1865        nr = img->nr + postimage->nr - preimage->nr;
1866        if (preimage->nr < postimage->nr) {
1867                /*
1868                 * NOTE: this knows that we never call remove_first_line()
1869                 * on anything other than pre/post image.
1870                 */
1871                img->line = xrealloc(img->line, nr * sizeof(*img->line));
1872                img->line_allocated = img->line;
1873        }
1874        if (preimage->nr != postimage->nr)
1875                memmove(img->line + applied_pos + postimage->nr,
1876                        img->line + applied_pos + preimage->nr,
1877                        (img->nr - (applied_pos + preimage->nr)) *
1878                        sizeof(*img->line));
1879        memcpy(img->line + applied_pos,
1880               postimage->line,
1881               postimage->nr * sizeof(*img->line));
1882        img->nr = nr;
1883}
1884
1885static int apply_one_fragment(struct image *img, struct fragment *frag,
1886                              int inaccurate_eof, unsigned ws_rule)
1887{
1888        int match_beginning, match_end;
1889        const char *patch = frag->patch;
1890        int size = frag->size;
1891        char *old, *new, *oldlines, *newlines;
1892        int new_blank_lines_at_end = 0;
1893        unsigned long leading, trailing;
1894        int pos, applied_pos;
1895        struct image preimage;
1896        struct image postimage;
1897
1898        memset(&preimage, 0, sizeof(preimage));
1899        memset(&postimage, 0, sizeof(postimage));
1900        oldlines = xmalloc(size);
1901        newlines = xmalloc(size);
1902
1903        old = oldlines;
1904        new = newlines;
1905        while (size > 0) {
1906                char first;
1907                int len = linelen(patch, size);
1908                int plen, added;
1909                int added_blank_line = 0;
1910
1911                if (!len)
1912                        break;
1913
1914                /*
1915                 * "plen" is how much of the line we should use for
1916                 * the actual patch data. Normally we just remove the
1917                 * first character on the line, but if the line is
1918                 * followed by "\ No newline", then we also remove the
1919                 * last one (which is the newline, of course).
1920                 */
1921                plen = len - 1;
1922                if (len < size && patch[len] == '\\')
1923                        plen--;
1924                first = *patch;
1925                if (apply_in_reverse) {
1926                        if (first == '-')
1927                                first = '+';
1928                        else if (first == '+')
1929                                first = '-';
1930                }
1931
1932                switch (first) {
1933                case '\n':
1934                        /* Newer GNU diff, empty context line */
1935                        if (plen < 0)
1936                                /* ... followed by '\No newline'; nothing */
1937                                break;
1938                        *old++ = '\n';
1939                        *new++ = '\n';
1940                        add_line_info(&preimage, "\n", 1, LINE_COMMON);
1941                        add_line_info(&postimage, "\n", 1, LINE_COMMON);
1942                        break;
1943                case ' ':
1944                case '-':
1945                        memcpy(old, patch + 1, plen);
1946                        add_line_info(&preimage, old, plen,
1947                                      (first == ' ' ? LINE_COMMON : 0));
1948                        old += plen;
1949                        if (first == '-')
1950                                break;
1951                /* Fall-through for ' ' */
1952                case '+':
1953                        /* --no-add does not add new lines */
1954                        if (first == '+' && no_add)
1955                                break;
1956
1957                        if (first != '+' ||
1958                            !whitespace_error ||
1959                            ws_error_action != correct_ws_error) {
1960                                memcpy(new, patch + 1, plen);
1961                                added = plen;
1962                        }
1963                        else {
1964                                added = ws_fix_copy(new, patch + 1, plen, ws_rule, &applied_after_fixing_ws);
1965                        }
1966                        add_line_info(&postimage, new, added,
1967                                      (first == '+' ? 0 : LINE_COMMON));
1968                        new += added;
1969                        if (first == '+' &&
1970                            added == 1 && new[-1] == '\n')
1971                                added_blank_line = 1;
1972                        break;
1973                case '@': case '\\':
1974                        /* Ignore it, we already handled it */
1975                        break;
1976                default:
1977                        if (apply_verbosely)
1978                                error("invalid start of line: '%c'", first);
1979                        return -1;
1980                }
1981                if (added_blank_line)
1982                        new_blank_lines_at_end++;
1983                else
1984                        new_blank_lines_at_end = 0;
1985                patch += len;
1986                size -= len;
1987        }
1988        if (inaccurate_eof &&
1989            old > oldlines && old[-1] == '\n' &&
1990            new > newlines && new[-1] == '\n') {
1991                old--;
1992                new--;
1993        }
1994
1995        leading = frag->leading;
1996        trailing = frag->trailing;
1997
1998        /*
1999         * A hunk to change lines at the beginning would begin with
2000         * @@ -1,L +N,M @@
2001         * but we need to be careful.  -U0 that inserts before the second
2002         * line also has this pattern.
2003         *
2004         * And a hunk to add to an empty file would begin with
2005         * @@ -0,0 +N,M @@
2006         *
2007         * In other words, a hunk that is (frag->oldpos <= 1) with or
2008         * without leading context must match at the beginning.
2009         */
2010        match_beginning = (!frag->oldpos ||
2011                           (frag->oldpos == 1 && !unidiff_zero));
2012
2013        /*
2014         * A hunk without trailing lines must match at the end.
2015         * However, we simply cannot tell if a hunk must match end
2016         * from the lack of trailing lines if the patch was generated
2017         * with unidiff without any context.
2018         */
2019        match_end = !unidiff_zero && !trailing;
2020
2021        pos = frag->newpos ? (frag->newpos - 1) : 0;
2022        preimage.buf = oldlines;
2023        preimage.len = old - oldlines;
2024        postimage.buf = newlines;
2025        postimage.len = new - newlines;
2026        preimage.line = preimage.line_allocated;
2027        postimage.line = postimage.line_allocated;
2028
2029        for (;;) {
2030
2031                applied_pos = find_pos(img, &preimage, &postimage, pos,
2032                                       ws_rule, match_beginning, match_end);
2033
2034                if (applied_pos >= 0)
2035                        break;
2036
2037                /* Am I at my context limits? */
2038                if ((leading <= p_context) && (trailing <= p_context))
2039                        break;
2040                if (match_beginning || match_end) {
2041                        match_beginning = match_end = 0;
2042                        continue;
2043                }
2044
2045                /*
2046                 * Reduce the number of context lines; reduce both
2047                 * leading and trailing if they are equal otherwise
2048                 * just reduce the larger context.
2049                 */
2050                if (leading >= trailing) {
2051                        remove_first_line(&preimage);
2052                        remove_first_line(&postimage);
2053                        pos--;
2054                        leading--;
2055                }
2056                if (trailing > leading) {
2057                        remove_last_line(&preimage);
2058                        remove_last_line(&postimage);
2059                        trailing--;
2060                }
2061        }
2062
2063        if (applied_pos >= 0) {
2064                if (ws_error_action == correct_ws_error &&
2065                    new_blank_lines_at_end &&
2066                    postimage.nr + applied_pos == img->nr) {
2067                        /*
2068                         * If the patch application adds blank lines
2069                         * at the end, and if the patch applies at the
2070                         * end of the image, remove those added blank
2071                         * lines.
2072                         */
2073                        while (new_blank_lines_at_end--)
2074                                remove_last_line(&postimage);
2075                }
2076
2077                /*
2078                 * Warn if it was necessary to reduce the number
2079                 * of context lines.
2080                 */
2081                if ((leading != frag->leading) ||
2082                    (trailing != frag->trailing))
2083                        fprintf(stderr, "Context reduced to (%ld/%ld)"
2084                                " to apply fragment at %d\n",
2085                                leading, trailing, applied_pos+1);
2086                update_image(img, applied_pos, &preimage, &postimage);
2087        } else {
2088                if (apply_verbosely)
2089                        error("while searching for:\n%.*s",
2090                              (int)(old - oldlines), oldlines);
2091        }
2092
2093        free(oldlines);
2094        free(newlines);
2095        free(preimage.line_allocated);
2096        free(postimage.line_allocated);
2097
2098        return (applied_pos < 0);
2099}
2100
2101static int apply_binary_fragment(struct image *img, struct patch *patch)
2102{
2103        struct fragment *fragment = patch->fragments;
2104        unsigned long len;
2105        void *dst;
2106
2107        /* Binary patch is irreversible without the optional second hunk */
2108        if (apply_in_reverse) {
2109                if (!fragment->next)
2110                        return error("cannot reverse-apply a binary patch "
2111                                     "without the reverse hunk to '%s'",
2112                                     patch->new_name
2113                                     ? patch->new_name : patch->old_name);
2114                fragment = fragment->next;
2115        }
2116        switch (fragment->binary_patch_method) {
2117        case BINARY_DELTA_DEFLATED:
2118                dst = patch_delta(img->buf, img->len, fragment->patch,
2119                                  fragment->size, &len);
2120                if (!dst)
2121                        return -1;
2122                clear_image(img);
2123                img->buf = dst;
2124                img->len = len;
2125                return 0;
2126        case BINARY_LITERAL_DEFLATED:
2127                clear_image(img);
2128                img->len = fragment->size;
2129                img->buf = xmalloc(img->len+1);
2130                memcpy(img->buf, fragment->patch, img->len);
2131                img->buf[img->len] = '\0';
2132                return 0;
2133        }
2134        return -1;
2135}
2136
2137static int apply_binary(struct image *img, struct patch *patch)
2138{
2139        const char *name = patch->old_name ? patch->old_name : patch->new_name;
2140        unsigned char sha1[20];
2141
2142        /*
2143         * For safety, we require patch index line to contain
2144         * full 40-byte textual SHA1 for old and new, at least for now.
2145         */
2146        if (strlen(patch->old_sha1_prefix) != 40 ||
2147            strlen(patch->new_sha1_prefix) != 40 ||
2148            get_sha1_hex(patch->old_sha1_prefix, sha1) ||
2149            get_sha1_hex(patch->new_sha1_prefix, sha1))
2150                return error("cannot apply binary patch to '%s' "
2151                             "without full index line", name);
2152
2153        if (patch->old_name) {
2154                /*
2155                 * See if the old one matches what the patch
2156                 * applies to.
2157                 */
2158                hash_sha1_file(img->buf, img->len, blob_type, sha1);
2159                if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
2160                        return error("the patch applies to '%s' (%s), "
2161                                     "which does not match the "
2162                                     "current contents.",
2163                                     name, sha1_to_hex(sha1));
2164        }
2165        else {
2166                /* Otherwise, the old one must be empty. */
2167                if (img->len)
2168                        return error("the patch applies to an empty "
2169                                     "'%s' but it is not empty", name);
2170        }
2171
2172        get_sha1_hex(patch->new_sha1_prefix, sha1);
2173        if (is_null_sha1(sha1)) {
2174                clear_image(img);
2175                return 0; /* deletion patch */
2176        }
2177
2178        if (has_sha1_file(sha1)) {
2179                /* We already have the postimage */
2180                enum object_type type;
2181                unsigned long size;
2182                char *result;
2183
2184                result = read_sha1_file(sha1, &type, &size);
2185                if (!result)
2186                        return error("the necessary postimage %s for "
2187                                     "'%s' cannot be read",
2188                                     patch->new_sha1_prefix, name);
2189                clear_image(img);
2190                img->buf = result;
2191                img->len = size;
2192        } else {
2193                /*
2194                 * We have verified buf matches the preimage;
2195                 * apply the patch data to it, which is stored
2196                 * in the patch->fragments->{patch,size}.
2197                 */
2198                if (apply_binary_fragment(img, patch))
2199                        return error("binary patch does not apply to '%s'",
2200                                     name);
2201
2202                /* verify that the result matches */
2203                hash_sha1_file(img->buf, img->len, blob_type, sha1);
2204                if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
2205                        return error("binary patch to '%s' creates incorrect result (expecting %s, got %s)",
2206                                name, patch->new_sha1_prefix, sha1_to_hex(sha1));
2207        }
2208
2209        return 0;
2210}
2211
2212static int apply_fragments(struct image *img, struct patch *patch)
2213{
2214        struct fragment *frag = patch->fragments;
2215        const char *name = patch->old_name ? patch->old_name : patch->new_name;
2216        unsigned ws_rule = patch->ws_rule;
2217        unsigned inaccurate_eof = patch->inaccurate_eof;
2218
2219        if (patch->is_binary)
2220                return apply_binary(img, patch);
2221
2222        while (frag) {
2223                if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule)) {
2224                        error("patch failed: %s:%ld", name, frag->oldpos);
2225                        if (!apply_with_reject)
2226                                return -1;
2227                        frag->rejected = 1;
2228                }
2229                frag = frag->next;
2230        }
2231        return 0;
2232}
2233
2234static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
2235{
2236        if (!ce)
2237                return 0;
2238
2239        if (S_ISGITLINK(ce->ce_mode)) {
2240                strbuf_grow(buf, 100);
2241                strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(ce->sha1));
2242        } else {
2243                enum object_type type;
2244                unsigned long sz;
2245                char *result;
2246
2247                result = read_sha1_file(ce->sha1, &type, &sz);
2248                if (!result)
2249                        return -1;
2250                /* XXX read_sha1_file NUL-terminates */
2251                strbuf_attach(buf, result, sz, sz + 1);
2252        }
2253        return 0;
2254}
2255
2256static struct patch *in_fn_table(const char *name)
2257{
2258        struct string_list_item *item;
2259
2260        if (name == NULL)
2261                return NULL;
2262
2263        item = string_list_lookup(name, &fn_table);
2264        if (item != NULL)
2265                return (struct patch *)item->util;
2266
2267        return NULL;
2268}
2269
2270static void add_to_fn_table(struct patch *patch)
2271{
2272        struct string_list_item *item;
2273
2274        /*
2275         * Always add new_name unless patch is a deletion
2276         * This should cover the cases for normal diffs,
2277         * file creations and copies
2278         */
2279        if (patch->new_name != NULL) {
2280                item = string_list_insert(patch->new_name, &fn_table);
2281                item->util = patch;
2282        }
2283
2284        /*
2285         * store a failure on rename/deletion cases because
2286         * later chunks shouldn't patch old names
2287         */
2288        if ((patch->new_name == NULL) || (patch->is_rename)) {
2289                item = string_list_insert(patch->old_name, &fn_table);
2290                item->util = (struct patch *) -1;
2291        }
2292}
2293
2294static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
2295{
2296        struct strbuf buf = STRBUF_INIT;
2297        struct image image;
2298        size_t len;
2299        char *img;
2300        struct patch *tpatch;
2301
2302        if (!(patch->is_copy || patch->is_rename) &&
2303            ((tpatch = in_fn_table(patch->old_name)) != NULL)) {
2304                if (tpatch == (struct patch *) -1) {
2305                        return error("patch %s has been renamed/deleted",
2306                                patch->old_name);
2307                }
2308                /* We have a patched copy in memory use that */
2309                strbuf_add(&buf, tpatch->result, tpatch->resultsize);
2310        } else if (cached) {
2311                if (read_file_or_gitlink(ce, &buf))
2312                        return error("read of %s failed", patch->old_name);
2313        } else if (patch->old_name) {
2314                if (S_ISGITLINK(patch->old_mode)) {
2315                        if (ce) {
2316                                read_file_or_gitlink(ce, &buf);
2317                        } else {
2318                                /*
2319                                 * There is no way to apply subproject
2320                                 * patch without looking at the index.
2321                                 */
2322                                patch->fragments = NULL;
2323                        }
2324                } else {
2325                        if (read_old_data(st, patch->old_name, &buf))
2326                                return error("read of %s failed", patch->old_name);
2327                }
2328        }
2329
2330        img = strbuf_detach(&buf, &len);
2331        prepare_image(&image, img, len, !patch->is_binary);
2332
2333        if (apply_fragments(&image, patch) < 0)
2334                return -1; /* note with --reject this succeeds. */
2335        patch->result = image.buf;
2336        patch->resultsize = image.len;
2337        add_to_fn_table(patch);
2338        free(image.line_allocated);
2339
2340        if (0 < patch->is_delete && patch->resultsize)
2341                return error("removal patch leaves file contents");
2342
2343        return 0;
2344}
2345
2346static int check_to_create_blob(const char *new_name, int ok_if_exists)
2347{
2348        struct stat nst;
2349        if (!lstat(new_name, &nst)) {
2350                if (S_ISDIR(nst.st_mode) || ok_if_exists)
2351                        return 0;
2352                /*
2353                 * A leading component of new_name might be a symlink
2354                 * that is going to be removed with this patch, but
2355                 * still pointing at somewhere that has the path.
2356                 * In such a case, path "new_name" does not exist as
2357                 * far as git is concerned.
2358                 */
2359                if (has_symlink_leading_path(strlen(new_name), new_name))
2360                        return 0;
2361
2362                return error("%s: already exists in working directory", new_name);
2363        }
2364        else if ((errno != ENOENT) && (errno != ENOTDIR))
2365                return error("%s: %s", new_name, strerror(errno));
2366        return 0;
2367}
2368
2369static int verify_index_match(struct cache_entry *ce, struct stat *st)
2370{
2371        if (S_ISGITLINK(ce->ce_mode)) {
2372                if (!S_ISDIR(st->st_mode))
2373                        return -1;
2374                return 0;
2375        }
2376        return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID);
2377}
2378
2379static int check_preimage(struct patch *patch, struct cache_entry **ce, struct stat *st)
2380{
2381        const char *old_name = patch->old_name;
2382        struct patch *tpatch = NULL;
2383        int stat_ret = 0;
2384        unsigned st_mode = 0;
2385
2386        /*
2387         * Make sure that we do not have local modifications from the
2388         * index when we are looking at the index.  Also make sure
2389         * we have the preimage file to be patched in the work tree,
2390         * unless --cached, which tells git to apply only in the index.
2391         */
2392        if (!old_name)
2393                return 0;
2394
2395        assert(patch->is_new <= 0);
2396
2397        if (!(patch->is_copy || patch->is_rename) &&
2398            (tpatch = in_fn_table(old_name)) != NULL) {
2399                if (tpatch == (struct patch *) -1) {
2400                        return error("%s: has been deleted/renamed", old_name);
2401                }
2402                st_mode = tpatch->new_mode;
2403        } else if (!cached) {
2404                stat_ret = lstat(old_name, st);
2405                if (stat_ret && errno != ENOENT)
2406                        return error("%s: %s", old_name, strerror(errno));
2407        }
2408
2409        if (check_index && !tpatch) {
2410                int pos = cache_name_pos(old_name, strlen(old_name));
2411                if (pos < 0) {
2412                        if (patch->is_new < 0)
2413                                goto is_new;
2414                        return error("%s: does not exist in index", old_name);
2415                }
2416                *ce = active_cache[pos];
2417                if (stat_ret < 0) {
2418                        struct checkout costate;
2419                        /* checkout */
2420                        costate.base_dir = "";
2421                        costate.base_dir_len = 0;
2422                        costate.force = 0;
2423                        costate.quiet = 0;
2424                        costate.not_new = 0;
2425                        costate.refresh_cache = 1;
2426                        if (checkout_entry(*ce, &costate, NULL) ||
2427                            lstat(old_name, st))
2428                                return -1;
2429                }
2430                if (!cached && verify_index_match(*ce, st))
2431                        return error("%s: does not match index", old_name);
2432                if (cached)
2433                        st_mode = (*ce)->ce_mode;
2434        } else if (stat_ret < 0) {
2435                if (patch->is_new < 0)
2436                        goto is_new;
2437                return error("%s: %s", old_name, strerror(errno));
2438        }
2439
2440        if (!cached)
2441                st_mode = ce_mode_from_stat(*ce, st->st_mode);
2442
2443        if (patch->is_new < 0)
2444                patch->is_new = 0;
2445        if (!patch->old_mode)
2446                patch->old_mode = st_mode;
2447        if ((st_mode ^ patch->old_mode) & S_IFMT)
2448                return error("%s: wrong type", old_name);
2449        if (st_mode != patch->old_mode)
2450                fprintf(stderr, "warning: %s has type %o, expected %o\n",
2451                        old_name, st_mode, patch->old_mode);
2452        return 0;
2453
2454 is_new:
2455        patch->is_new = 1;
2456        patch->is_delete = 0;
2457        patch->old_name = NULL;
2458        return 0;
2459}
2460
2461static int check_patch(struct patch *patch)
2462{
2463        struct stat st;
2464        const char *old_name = patch->old_name;
2465        const char *new_name = patch->new_name;
2466        const char *name = old_name ? old_name : new_name;
2467        struct cache_entry *ce = NULL;
2468        int ok_if_exists;
2469        int status;
2470
2471        patch->rejected = 1; /* we will drop this after we succeed */
2472
2473        status = check_preimage(patch, &ce, &st);
2474        if (status)
2475                return status;
2476        old_name = patch->old_name;
2477
2478        if (in_fn_table(new_name) == (struct patch *) -1)
2479                /*
2480                 * A type-change diff is always split into a patch to
2481                 * delete old, immediately followed by a patch to
2482                 * create new (see diff.c::run_diff()); in such a case
2483                 * it is Ok that the entry to be deleted by the
2484                 * previous patch is still in the working tree and in
2485                 * the index.
2486                 */
2487                ok_if_exists = 1;
2488        else
2489                ok_if_exists = 0;
2490
2491        if (new_name &&
2492            ((0 < patch->is_new) | (0 < patch->is_rename) | patch->is_copy)) {
2493                if (check_index &&
2494                    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
2495                    !ok_if_exists)
2496                        return error("%s: already exists in index", new_name);
2497                if (!cached) {
2498                        int err = check_to_create_blob(new_name, ok_if_exists);
2499                        if (err)
2500                                return err;
2501                }
2502                if (!patch->new_mode) {
2503                        if (0 < patch->is_new)
2504                                patch->new_mode = S_IFREG | 0644;
2505                        else
2506                                patch->new_mode = patch->old_mode;
2507                }
2508        }
2509
2510        if (new_name && old_name) {
2511                int same = !strcmp(old_name, new_name);
2512                if (!patch->new_mode)
2513                        patch->new_mode = patch->old_mode;
2514                if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
2515                        return error("new mode (%o) of %s does not match old mode (%o)%s%s",
2516                                patch->new_mode, new_name, patch->old_mode,
2517                                same ? "" : " of ", same ? "" : old_name);
2518        }
2519
2520        if (apply_data(patch, &st, ce) < 0)
2521                return error("%s: patch does not apply", name);
2522        patch->rejected = 0;
2523        return 0;
2524}
2525
2526static int check_patch_list(struct patch *patch)
2527{
2528        int err = 0;
2529
2530        while (patch) {
2531                if (apply_verbosely)
2532                        say_patch_name(stderr,
2533                                       "Checking patch ", patch, "...\n");
2534                err |= check_patch(patch);
2535                patch = patch->next;
2536        }
2537        return err;
2538}
2539
2540/* This function tries to read the sha1 from the current index */
2541static int get_current_sha1(const char *path, unsigned char *sha1)
2542{
2543        int pos;
2544
2545        if (read_cache() < 0)
2546                return -1;
2547        pos = cache_name_pos(path, strlen(path));
2548        if (pos < 0)
2549                return -1;
2550        hashcpy(sha1, active_cache[pos]->sha1);
2551        return 0;
2552}
2553
2554/* Build an index that contains the just the files needed for a 3way merge */
2555static void build_fake_ancestor(struct patch *list, const char *filename)
2556{
2557        struct patch *patch;
2558        struct index_state result = { 0 };
2559        int fd;
2560
2561        /* Once we start supporting the reverse patch, it may be
2562         * worth showing the new sha1 prefix, but until then...
2563         */
2564        for (patch = list; patch; patch = patch->next) {
2565                const unsigned char *sha1_ptr;
2566                unsigned char sha1[20];
2567                struct cache_entry *ce;
2568                const char *name;
2569
2570                name = patch->old_name ? patch->old_name : patch->new_name;
2571                if (0 < patch->is_new)
2572                        continue;
2573                else if (get_sha1(patch->old_sha1_prefix, sha1))
2574                        /* git diff has no index line for mode/type changes */
2575                        if (!patch->lines_added && !patch->lines_deleted) {
2576                                if (get_current_sha1(patch->new_name, sha1) ||
2577                                    get_current_sha1(patch->old_name, sha1))
2578                                        die("mode change for %s, which is not "
2579                                                "in current HEAD", name);
2580                                sha1_ptr = sha1;
2581                        } else
2582                                die("sha1 information is lacking or useless "
2583                                        "(%s).", name);
2584                else
2585                        sha1_ptr = sha1;
2586
2587                ce = make_cache_entry(patch->old_mode, sha1_ptr, name, 0, 0);
2588                if (!ce)
2589                        die("make_cache_entry failed for path '%s'", name);
2590                if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
2591                        die ("Could not add %s to temporary index", name);
2592        }
2593
2594        fd = open(filename, O_WRONLY | O_CREAT, 0666);
2595        if (fd < 0 || write_index(&result, fd) || close(fd))
2596                die ("Could not write temporary index to %s", filename);
2597
2598        discard_index(&result);
2599}
2600
2601static void stat_patch_list(struct patch *patch)
2602{
2603        int files, adds, dels;
2604
2605        for (files = adds = dels = 0 ; patch ; patch = patch->next) {
2606                files++;
2607                adds += patch->lines_added;
2608                dels += patch->lines_deleted;
2609                show_stats(patch);
2610        }
2611
2612        printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
2613}
2614
2615static void numstat_patch_list(struct patch *patch)
2616{
2617        for ( ; patch; patch = patch->next) {
2618                const char *name;
2619                name = patch->new_name ? patch->new_name : patch->old_name;
2620                if (patch->is_binary)
2621                        printf("-\t-\t");
2622                else
2623                        printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
2624                write_name_quoted(name, stdout, line_termination);
2625        }
2626}
2627
2628static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
2629{
2630        if (mode)
2631                printf(" %s mode %06o %s\n", newdelete, mode, name);
2632        else
2633                printf(" %s %s\n", newdelete, name);
2634}
2635
2636static void show_mode_change(struct patch *p, int show_name)
2637{
2638        if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
2639                if (show_name)
2640                        printf(" mode change %06o => %06o %s\n",
2641                               p->old_mode, p->new_mode, p->new_name);
2642                else
2643                        printf(" mode change %06o => %06o\n",
2644                               p->old_mode, p->new_mode);
2645        }
2646}
2647
2648static void show_rename_copy(struct patch *p)
2649{
2650        const char *renamecopy = p->is_rename ? "rename" : "copy";
2651        const char *old, *new;
2652
2653        /* Find common prefix */
2654        old = p->old_name;
2655        new = p->new_name;
2656        while (1) {
2657                const char *slash_old, *slash_new;
2658                slash_old = strchr(old, '/');
2659                slash_new = strchr(new, '/');
2660                if (!slash_old ||
2661                    !slash_new ||
2662                    slash_old - old != slash_new - new ||
2663                    memcmp(old, new, slash_new - new))
2664                        break;
2665                old = slash_old + 1;
2666                new = slash_new + 1;
2667        }
2668        /* p->old_name thru old is the common prefix, and old and new
2669         * through the end of names are renames
2670         */
2671        if (old != p->old_name)
2672                printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
2673                       (int)(old - p->old_name), p->old_name,
2674                       old, new, p->score);
2675        else
2676                printf(" %s %s => %s (%d%%)\n", renamecopy,
2677                       p->old_name, p->new_name, p->score);
2678        show_mode_change(p, 0);
2679}
2680
2681static void summary_patch_list(struct patch *patch)
2682{
2683        struct patch *p;
2684
2685        for (p = patch; p; p = p->next) {
2686                if (p->is_new)
2687                        show_file_mode_name("create", p->new_mode, p->new_name);
2688                else if (p->is_delete)
2689                        show_file_mode_name("delete", p->old_mode, p->old_name);
2690                else {
2691                        if (p->is_rename || p->is_copy)
2692                                show_rename_copy(p);
2693                        else {
2694                                if (p->score) {
2695                                        printf(" rewrite %s (%d%%)\n",
2696                                               p->new_name, p->score);
2697                                        show_mode_change(p, 0);
2698                                }
2699                                else
2700                                        show_mode_change(p, 1);
2701                        }
2702                }
2703        }
2704}
2705
2706static void patch_stats(struct patch *patch)
2707{
2708        int lines = patch->lines_added + patch->lines_deleted;
2709
2710        if (lines > max_change)
2711                max_change = lines;
2712        if (patch->old_name) {
2713                int len = quote_c_style(patch->old_name, NULL, NULL, 0);
2714                if (!len)
2715                        len = strlen(patch->old_name);
2716                if (len > max_len)
2717                        max_len = len;
2718        }
2719        if (patch->new_name) {
2720                int len = quote_c_style(patch->new_name, NULL, NULL, 0);
2721                if (!len)
2722                        len = strlen(patch->new_name);
2723                if (len > max_len)
2724                        max_len = len;
2725        }
2726}
2727
2728static void remove_file(struct patch *patch, int rmdir_empty)
2729{
2730        if (update_index) {
2731                if (remove_file_from_cache(patch->old_name) < 0)
2732                        die("unable to remove %s from index", patch->old_name);
2733        }
2734        if (!cached) {
2735                if (S_ISGITLINK(patch->old_mode)) {
2736                        if (rmdir(patch->old_name))
2737                                warning("unable to remove submodule %s",
2738                                        patch->old_name);
2739                } else if (!unlink(patch->old_name) && rmdir_empty) {
2740                        remove_path(patch->old_name);
2741                }
2742        }
2743}
2744
2745static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
2746{
2747        struct stat st;
2748        struct cache_entry *ce;
2749        int namelen = strlen(path);
2750        unsigned ce_size = cache_entry_size(namelen);
2751
2752        if (!update_index)
2753                return;
2754
2755        ce = xcalloc(1, ce_size);
2756        memcpy(ce->name, path, namelen);
2757        ce->ce_mode = create_ce_mode(mode);
2758        ce->ce_flags = namelen;
2759        if (S_ISGITLINK(mode)) {
2760                const char *s = buf;
2761
2762                if (get_sha1_hex(s + strlen("Subproject commit "), ce->sha1))
2763                        die("corrupt patch for subproject %s", path);
2764        } else {
2765                if (!cached) {
2766                        if (lstat(path, &st) < 0)
2767                                die("unable to stat newly created file %s",
2768                                    path);
2769                        fill_stat_cache_info(ce, &st);
2770                }
2771                if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
2772                        die("unable to create backing store for newly created file %s", path);
2773        }
2774        if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
2775                die("unable to add cache entry for %s", path);
2776}
2777
2778static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
2779{
2780        int fd;
2781        struct strbuf nbuf = STRBUF_INIT;
2782
2783        if (S_ISGITLINK(mode)) {
2784                struct stat st;
2785                if (!lstat(path, &st) && S_ISDIR(st.st_mode))
2786                        return 0;
2787                return mkdir(path, 0777);
2788        }
2789
2790        if (has_symlinks && S_ISLNK(mode))
2791                /* Although buf:size is counted string, it also is NUL
2792                 * terminated.
2793                 */
2794                return symlink(buf, path);
2795
2796        fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
2797        if (fd < 0)
2798                return -1;
2799
2800        if (convert_to_working_tree(path, buf, size, &nbuf)) {
2801                size = nbuf.len;
2802                buf  = nbuf.buf;
2803        }
2804        write_or_die(fd, buf, size);
2805        strbuf_release(&nbuf);
2806
2807        if (close(fd) < 0)
2808                die("closing file %s: %s", path, strerror(errno));
2809        return 0;
2810}
2811
2812/*
2813 * We optimistically assume that the directories exist,
2814 * which is true 99% of the time anyway. If they don't,
2815 * we create them and try again.
2816 */
2817static void create_one_file(char *path, unsigned mode, const char *buf, unsigned long size)
2818{
2819        if (cached)
2820                return;
2821        if (!try_create_file(path, mode, buf, size))
2822                return;
2823
2824        if (errno == ENOENT) {
2825                if (safe_create_leading_directories(path))
2826                        return;
2827                if (!try_create_file(path, mode, buf, size))
2828                        return;
2829        }
2830
2831        if (errno == EEXIST || errno == EACCES) {
2832                /* We may be trying to create a file where a directory
2833                 * used to be.
2834                 */
2835                struct stat st;
2836                if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
2837                        errno = EEXIST;
2838        }
2839
2840        if (errno == EEXIST) {
2841                unsigned int nr = getpid();
2842
2843                for (;;) {
2844                        char newpath[PATH_MAX];
2845                        mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
2846                        if (!try_create_file(newpath, mode, buf, size)) {
2847                                if (!rename(newpath, path))
2848                                        return;
2849                                unlink(newpath);
2850                                break;
2851                        }
2852                        if (errno != EEXIST)
2853                                break;
2854                        ++nr;
2855                }
2856        }
2857        die("unable to write file %s mode %o", path, mode);
2858}
2859
2860static void create_file(struct patch *patch)
2861{
2862        char *path = patch->new_name;
2863        unsigned mode = patch->new_mode;
2864        unsigned long size = patch->resultsize;
2865        char *buf = patch->result;
2866
2867        if (!mode)
2868                mode = S_IFREG | 0644;
2869        create_one_file(path, mode, buf, size);
2870        add_index_file(path, mode, buf, size);
2871}
2872
2873/* phase zero is to remove, phase one is to create */
2874static void write_out_one_result(struct patch *patch, int phase)
2875{
2876        if (patch->is_delete > 0) {
2877                if (phase == 0)
2878                        remove_file(patch, 1);
2879                return;
2880        }
2881        if (patch->is_new > 0 || patch->is_copy) {
2882                if (phase == 1)
2883                        create_file(patch);
2884                return;
2885        }
2886        /*
2887         * Rename or modification boils down to the same
2888         * thing: remove the old, write the new
2889         */
2890        if (phase == 0)
2891                remove_file(patch, patch->is_rename);
2892        if (phase == 1)
2893                create_file(patch);
2894}
2895
2896static int write_out_one_reject(struct patch *patch)
2897{
2898        FILE *rej;
2899        char namebuf[PATH_MAX];
2900        struct fragment *frag;
2901        int cnt = 0;
2902
2903        for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
2904                if (!frag->rejected)
2905                        continue;
2906                cnt++;
2907        }
2908
2909        if (!cnt) {
2910                if (apply_verbosely)
2911                        say_patch_name(stderr,
2912                                       "Applied patch ", patch, " cleanly.\n");
2913                return 0;
2914        }
2915
2916        /* This should not happen, because a removal patch that leaves
2917         * contents are marked "rejected" at the patch level.
2918         */
2919        if (!patch->new_name)
2920                die("internal error");
2921
2922        /* Say this even without --verbose */
2923        say_patch_name(stderr, "Applying patch ", patch, " with");
2924        fprintf(stderr, " %d rejects...\n", cnt);
2925
2926        cnt = strlen(patch->new_name);
2927        if (ARRAY_SIZE(namebuf) <= cnt + 5) {
2928                cnt = ARRAY_SIZE(namebuf) - 5;
2929                fprintf(stderr,
2930                        "warning: truncating .rej filename to %.*s.rej",
2931                        cnt - 1, patch->new_name);
2932        }
2933        memcpy(namebuf, patch->new_name, cnt);
2934        memcpy(namebuf + cnt, ".rej", 5);
2935
2936        rej = fopen(namebuf, "w");
2937        if (!rej)
2938                return error("cannot open %s: %s", namebuf, strerror(errno));
2939
2940        /* Normal git tools never deal with .rej, so do not pretend
2941         * this is a git patch by saying --git nor give extended
2942         * headers.  While at it, maybe please "kompare" that wants
2943         * the trailing TAB and some garbage at the end of line ;-).
2944         */
2945        fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
2946                patch->new_name, patch->new_name);
2947        for (cnt = 1, frag = patch->fragments;
2948             frag;
2949             cnt++, frag = frag->next) {
2950                if (!frag->rejected) {
2951                        fprintf(stderr, "Hunk #%d applied cleanly.\n", cnt);
2952                        continue;
2953                }
2954                fprintf(stderr, "Rejected hunk #%d.\n", cnt);
2955                fprintf(rej, "%.*s", frag->size, frag->patch);
2956                if (frag->patch[frag->size-1] != '\n')
2957                        fputc('\n', rej);
2958        }
2959        fclose(rej);
2960        return -1;
2961}
2962
2963static int write_out_results(struct patch *list, int skipped_patch)
2964{
2965        int phase;
2966        int errs = 0;
2967        struct patch *l;
2968
2969        if (!list && !skipped_patch)
2970                return error("No changes");
2971
2972        for (phase = 0; phase < 2; phase++) {
2973                l = list;
2974                while (l) {
2975                        if (l->rejected)
2976                                errs = 1;
2977                        else {
2978                                write_out_one_result(l, phase);
2979                                if (phase == 1 && write_out_one_reject(l))
2980                                        errs = 1;
2981                        }
2982                        l = l->next;
2983                }
2984        }
2985        return errs;
2986}
2987
2988static struct lock_file lock_file;
2989
2990static struct string_list limit_by_name;
2991static int has_include;
2992static void add_name_limit(const char *name, int exclude)
2993{
2994        struct string_list_item *it;
2995
2996        it = string_list_append(name, &limit_by_name);
2997        it->util = exclude ? NULL : (void *) 1;
2998}
2999
3000static int use_patch(struct patch *p)
3001{
3002        const char *pathname = p->new_name ? p->new_name : p->old_name;
3003        int i;
3004
3005        /* Paths outside are not touched regardless of "--include" */
3006        if (0 < prefix_length) {
3007                int pathlen = strlen(pathname);
3008                if (pathlen <= prefix_length ||
3009                    memcmp(prefix, pathname, prefix_length))
3010                        return 0;
3011        }
3012
3013        /* See if it matches any of exclude/include rule */
3014        for (i = 0; i < limit_by_name.nr; i++) {
3015                struct string_list_item *it = &limit_by_name.items[i];
3016                if (!fnmatch(it->string, pathname, 0))
3017                        return (it->util != NULL);
3018        }
3019
3020        /*
3021         * If we had any include, a path that does not match any rule is
3022         * not used.  Otherwise, we saw bunch of exclude rules (or none)
3023         * and such a path is used.
3024         */
3025        return !has_include;
3026}
3027
3028
3029static void prefix_one(char **name)
3030{
3031        char *old_name = *name;
3032        if (!old_name)
3033                return;
3034        *name = xstrdup(prefix_filename(prefix, prefix_length, *name));
3035        free(old_name);
3036}
3037
3038static void prefix_patches(struct patch *p)
3039{
3040        if (!prefix || p->is_toplevel_relative)
3041                return;
3042        for ( ; p; p = p->next) {
3043                if (p->new_name == p->old_name) {
3044                        char *prefixed = p->new_name;
3045                        prefix_one(&prefixed);
3046                        p->new_name = p->old_name = prefixed;
3047                }
3048                else {
3049                        prefix_one(&p->new_name);
3050                        prefix_one(&p->old_name);
3051                }
3052        }
3053}
3054
3055#define INACCURATE_EOF  (1<<0)
3056#define RECOUNT         (1<<1)
3057
3058static int apply_patch(int fd, const char *filename, int options)
3059{
3060        size_t offset;
3061        struct strbuf buf = STRBUF_INIT;
3062        struct patch *list = NULL, **listp = &list;
3063        int skipped_patch = 0;
3064
3065        /* FIXME - memory leak when using multiple patch files as inputs */
3066        memset(&fn_table, 0, sizeof(struct string_list));
3067        patch_input_file = filename;
3068        read_patch_file(&buf, fd);
3069        offset = 0;
3070        while (offset < buf.len) {
3071                struct patch *patch;
3072                int nr;
3073
3074                patch = xcalloc(1, sizeof(*patch));
3075                patch->inaccurate_eof = !!(options & INACCURATE_EOF);
3076                patch->recount =  !!(options & RECOUNT);
3077                nr = parse_chunk(buf.buf + offset, buf.len - offset, patch);
3078                if (nr < 0)
3079                        break;
3080                if (apply_in_reverse)
3081                        reverse_patches(patch);
3082                if (prefix)
3083                        prefix_patches(patch);
3084                if (use_patch(patch)) {
3085                        patch_stats(patch);
3086                        *listp = patch;
3087                        listp = &patch->next;
3088                }
3089                else {
3090                        /* perhaps free it a bit better? */
3091                        free(patch);
3092                        skipped_patch++;
3093                }
3094                offset += nr;
3095        }
3096
3097        if (whitespace_error && (ws_error_action == die_on_ws_error))
3098                apply = 0;
3099
3100        update_index = check_index && apply;
3101        if (update_index && newfd < 0)
3102                newfd = hold_locked_index(&lock_file, 1);
3103
3104        if (check_index) {
3105                if (read_cache() < 0)
3106                        die("unable to read index file");
3107        }
3108
3109        if ((check || apply) &&
3110            check_patch_list(list) < 0 &&
3111            !apply_with_reject)
3112                exit(1);
3113
3114        if (apply && write_out_results(list, skipped_patch))
3115                exit(1);
3116
3117        if (fake_ancestor)
3118                build_fake_ancestor(list, fake_ancestor);
3119
3120        if (diffstat)
3121                stat_patch_list(list);
3122
3123        if (numstat)
3124                numstat_patch_list(list);
3125
3126        if (summary)
3127                summary_patch_list(list);
3128
3129        strbuf_release(&buf);
3130        return 0;
3131}
3132
3133static int git_apply_config(const char *var, const char *value, void *cb)
3134{
3135        if (!strcmp(var, "apply.whitespace"))
3136                return git_config_string(&apply_default_whitespace, var, value);
3137        return git_default_config(var, value, cb);
3138}
3139
3140
3141int cmd_apply(int argc, const char **argv, const char *unused_prefix)
3142{
3143        int i;
3144        int read_stdin = 1;
3145        int options = 0;
3146        int errs = 0;
3147        int is_not_gitdir;
3148
3149        const char *whitespace_option = NULL;
3150
3151        prefix = setup_git_directory_gently(&is_not_gitdir);
3152        prefix_length = prefix ? strlen(prefix) : 0;
3153        git_config(git_apply_config, NULL);
3154        if (apply_default_whitespace)
3155                parse_whitespace_option(apply_default_whitespace);
3156
3157        for (i = 1; i < argc; i++) {
3158                const char *arg = argv[i];
3159                char *end;
3160                int fd;
3161
3162                if (!strcmp(arg, "-")) {
3163                        errs |= apply_patch(0, "<stdin>", options);
3164                        read_stdin = 0;
3165                        continue;
3166                }
3167                if (!prefixcmp(arg, "--exclude=")) {
3168                        add_name_limit(arg + 10, 1);
3169                        continue;
3170                }
3171                if (!prefixcmp(arg, "--include=")) {
3172                        add_name_limit(arg + 10, 0);
3173                        has_include = 1;
3174                        continue;
3175                }
3176                if (!prefixcmp(arg, "-p")) {
3177                        p_value = atoi(arg + 2);
3178                        p_value_known = 1;
3179                        continue;
3180                }
3181                if (!strcmp(arg, "--no-add")) {
3182                        no_add = 1;
3183                        continue;
3184                }
3185                if (!strcmp(arg, "--stat")) {
3186                        apply = 0;
3187                        diffstat = 1;
3188                        continue;
3189                }
3190                if (!strcmp(arg, "--allow-binary-replacement") ||
3191                    !strcmp(arg, "--binary")) {
3192                        continue; /* now no-op */
3193                }
3194                if (!strcmp(arg, "--numstat")) {
3195                        apply = 0;
3196                        numstat = 1;
3197                        continue;
3198                }
3199                if (!strcmp(arg, "--summary")) {
3200                        apply = 0;
3201                        summary = 1;
3202                        continue;
3203                }
3204                if (!strcmp(arg, "--check")) {
3205                        apply = 0;
3206                        check = 1;
3207                        continue;
3208                }
3209                if (!strcmp(arg, "--index")) {
3210                        if (is_not_gitdir)
3211                                die("--index outside a repository");
3212                        check_index = 1;
3213                        continue;
3214                }
3215                if (!strcmp(arg, "--cached")) {
3216                        if (is_not_gitdir)
3217                                die("--cached outside a repository");
3218                        check_index = 1;
3219                        cached = 1;
3220                        continue;
3221                }
3222                if (!strcmp(arg, "--apply")) {
3223                        apply = 1;
3224                        continue;
3225                }
3226                if (!strcmp(arg, "--build-fake-ancestor")) {
3227                        apply = 0;
3228                        if (++i >= argc)
3229                                die ("need a filename");
3230                        fake_ancestor = argv[i];
3231                        continue;
3232                }
3233                if (!strcmp(arg, "-z")) {
3234                        line_termination = 0;
3235                        continue;
3236                }
3237                if (!prefixcmp(arg, "-C")) {
3238                        p_context = strtoul(arg + 2, &end, 0);
3239                        if (*end != '\0')
3240                                die("unrecognized context count '%s'", arg + 2);
3241                        continue;
3242                }
3243                if (!prefixcmp(arg, "--whitespace=")) {
3244                        whitespace_option = arg + 13;
3245                        parse_whitespace_option(arg + 13);
3246                        continue;
3247                }
3248                if (!strcmp(arg, "-R") || !strcmp(arg, "--reverse")) {
3249                        apply_in_reverse = 1;
3250                        continue;
3251                }
3252                if (!strcmp(arg, "--unidiff-zero")) {
3253                        unidiff_zero = 1;
3254                        continue;
3255                }
3256                if (!strcmp(arg, "--reject")) {
3257                        apply = apply_with_reject = apply_verbosely = 1;
3258                        continue;
3259                }
3260                if (!strcmp(arg, "-v") || !strcmp(arg, "--verbose")) {
3261                        apply_verbosely = 1;
3262                        continue;
3263                }
3264                if (!strcmp(arg, "--inaccurate-eof")) {
3265                        options |= INACCURATE_EOF;
3266                        continue;
3267                }
3268                if (!strcmp(arg, "--recount")) {
3269                        options |= RECOUNT;
3270                        continue;
3271                }
3272                if (!prefixcmp(arg, "--directory=")) {
3273                        arg += strlen("--directory=");
3274                        root_len = strlen(arg);
3275                        if (root_len && arg[root_len - 1] != '/') {
3276                                char *new_root;
3277                                root = new_root = xmalloc(root_len + 2);
3278                                strcpy(new_root, arg);
3279                                strcpy(new_root + root_len++, "/");
3280                        } else
3281                                root = arg;
3282                        continue;
3283                }
3284                if (0 < prefix_length)
3285                        arg = prefix_filename(prefix, prefix_length, arg);
3286
3287                fd = open(arg, O_RDONLY);
3288                if (fd < 0)
3289                        die("can't open patch '%s': %s", arg, strerror(errno));
3290                read_stdin = 0;
3291                set_default_whitespace_mode(whitespace_option);
3292                errs |= apply_patch(fd, arg, options);
3293                close(fd);
3294        }
3295        set_default_whitespace_mode(whitespace_option);
3296        if (read_stdin)
3297                errs |= apply_patch(0, "<stdin>", options);
3298        if (whitespace_error) {
3299                if (squelch_whitespace_errors &&
3300                    squelch_whitespace_errors < whitespace_error) {
3301                        int squelched =
3302                                whitespace_error - squelch_whitespace_errors;
3303                        fprintf(stderr, "warning: squelched %d "
3304                                "whitespace error%s\n",
3305                                squelched,
3306                                squelched == 1 ? "" : "s");
3307                }
3308                if (ws_error_action == die_on_ws_error)
3309                        die("%d line%s add%s whitespace errors.",
3310                            whitespace_error,
3311                            whitespace_error == 1 ? "" : "s",
3312                            whitespace_error == 1 ? "s" : "");
3313                if (applied_after_fixing_ws && apply)
3314                        fprintf(stderr, "warning: %d line%s applied after"
3315                                " fixing whitespace errors.\n",
3316                                applied_after_fixing_ws,
3317                                applied_after_fixing_ws == 1 ? "" : "s");
3318                else if (whitespace_error)
3319                        fprintf(stderr, "warning: %d line%s add%s whitespace errors.\n",
3320                                whitespace_error,
3321                                whitespace_error == 1 ? "" : "s",
3322                                whitespace_error == 1 ? "s" : "");
3323        }
3324
3325        if (update_index) {
3326                if (write_cache(newfd, active_cache, active_nr) ||
3327                    commit_locked_index(&lock_file))
3328                        die("Unable to write new index file");
3329        }
3330
3331        return !!errs;
3332}