Andrew's git / gitweb.git / commit.c
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commit.con commit Documentation/user-manual.txt: fix typo (5728329)
   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4#include "pkt-line.h"
   5#include "utf8.h"
   6#include "interpolate.h"
   7#include "diff.h"
   8#include "revision.h"
   9
  10int save_commit_buffer = 1;
  11
  12struct sort_node
  13{
  14        /*
  15         * the number of children of the associated commit
  16         * that also occur in the list being sorted.
  17         */
  18        unsigned int indegree;
  19
  20        /*
  21         * reference to original list item that we will re-use
  22         * on output.
  23         */
  24        struct commit_list * list_item;
  25
  26};
  27
  28const char *commit_type = "commit";
  29
  30static struct cmt_fmt_map {
  31        const char *n;
  32        size_t cmp_len;
  33        enum cmit_fmt v;
  34} cmt_fmts[] = {
  35        { "raw",        1,      CMIT_FMT_RAW },
  36        { "medium",     1,      CMIT_FMT_MEDIUM },
  37        { "short",      1,      CMIT_FMT_SHORT },
  38        { "email",      1,      CMIT_FMT_EMAIL },
  39        { "full",       5,      CMIT_FMT_FULL },
  40        { "fuller",     5,      CMIT_FMT_FULLER },
  41        { "oneline",    1,      CMIT_FMT_ONELINE },
  42        { "format:",    7,      CMIT_FMT_USERFORMAT},
  43};
  44
  45static char *user_format;
  46
  47enum cmit_fmt get_commit_format(const char *arg)
  48{
  49        int i;
  50
  51        if (!arg || !*arg)
  52                return CMIT_FMT_DEFAULT;
  53        if (*arg == '=')
  54                arg++;
  55        if (!prefixcmp(arg, "format:")) {
  56                if (user_format)
  57                        free(user_format);
  58                user_format = xstrdup(arg + 7);
  59                return CMIT_FMT_USERFORMAT;
  60        }
  61        for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
  62                if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) &&
  63                    !strncmp(arg, cmt_fmts[i].n, strlen(arg)))
  64                        return cmt_fmts[i].v;
  65        }
  66
  67        die("invalid --pretty format: %s", arg);
  68}
  69
  70static struct commit *check_commit(struct object *obj,
  71                                   const unsigned char *sha1,
  72                                   int quiet)
  73{
  74        if (obj->type != OBJ_COMMIT) {
  75                if (!quiet)
  76                        error("Object %s is a %s, not a commit",
  77                              sha1_to_hex(sha1), typename(obj->type));
  78                return NULL;
  79        }
  80        return (struct commit *) obj;
  81}
  82
  83struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
  84                                              int quiet)
  85{
  86        struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
  87
  88        if (!obj)
  89                return NULL;
  90        return check_commit(obj, sha1, quiet);
  91}
  92
  93struct commit *lookup_commit_reference(const unsigned char *sha1)
  94{
  95        return lookup_commit_reference_gently(sha1, 0);
  96}
  97
  98struct commit *lookup_commit(const unsigned char *sha1)
  99{
 100        struct object *obj = lookup_object(sha1);
 101        if (!obj)
 102                return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
 103        if (!obj->type)
 104                obj->type = OBJ_COMMIT;
 105        return check_commit(obj, sha1, 0);
 106}
 107
 108static unsigned long parse_commit_date(const char *buf)
 109{
 110        unsigned long date;
 111
 112        if (memcmp(buf, "author", 6))
 113                return 0;
 114        while (*buf++ != '\n')
 115                /* nada */;
 116        if (memcmp(buf, "committer", 9))
 117                return 0;
 118        while (*buf++ != '>')
 119                /* nada */;
 120        date = strtoul(buf, NULL, 10);
 121        if (date == ULONG_MAX)
 122                date = 0;
 123        return date;
 124}
 125
 126static struct commit_graft **commit_graft;
 127static int commit_graft_alloc, commit_graft_nr;
 128
 129static int commit_graft_pos(const unsigned char *sha1)
 130{
 131        int lo, hi;
 132        lo = 0;
 133        hi = commit_graft_nr;
 134        while (lo < hi) {
 135                int mi = (lo + hi) / 2;
 136                struct commit_graft *graft = commit_graft[mi];
 137                int cmp = hashcmp(sha1, graft->sha1);
 138                if (!cmp)
 139                        return mi;
 140                if (cmp < 0)
 141                        hi = mi;
 142                else
 143                        lo = mi + 1;
 144        }
 145        return -lo - 1;
 146}
 147
 148int register_commit_graft(struct commit_graft *graft, int ignore_dups)
 149{
 150        int pos = commit_graft_pos(graft->sha1);
 151
 152        if (0 <= pos) {
 153                if (ignore_dups)
 154                        free(graft);
 155                else {
 156                        free(commit_graft[pos]);
 157                        commit_graft[pos] = graft;
 158                }
 159                return 1;
 160        }
 161        pos = -pos - 1;
 162        if (commit_graft_alloc <= ++commit_graft_nr) {
 163                commit_graft_alloc = alloc_nr(commit_graft_alloc);
 164                commit_graft = xrealloc(commit_graft,
 165                                        sizeof(*commit_graft) *
 166                                        commit_graft_alloc);
 167        }
 168        if (pos < commit_graft_nr)
 169                memmove(commit_graft + pos + 1,
 170                        commit_graft + pos,
 171                        (commit_graft_nr - pos - 1) *
 172                        sizeof(*commit_graft));
 173        commit_graft[pos] = graft;
 174        return 0;
 175}
 176
 177struct commit_graft *read_graft_line(char *buf, int len)
 178{
 179        /* The format is just "Commit Parent1 Parent2 ...\n" */
 180        int i;
 181        struct commit_graft *graft = NULL;
 182
 183        if (buf[len-1] == '\n')
 184                buf[--len] = 0;
 185        if (buf[0] == '#' || buf[0] == '\0')
 186                return NULL;
 187        if ((len + 1) % 41) {
 188        bad_graft_data:
 189                error("bad graft data: %s", buf);
 190                free(graft);
 191                return NULL;
 192        }
 193        i = (len + 1) / 41 - 1;
 194        graft = xmalloc(sizeof(*graft) + 20 * i);
 195        graft->nr_parent = i;
 196        if (get_sha1_hex(buf, graft->sha1))
 197                goto bad_graft_data;
 198        for (i = 40; i < len; i += 41) {
 199                if (buf[i] != ' ')
 200                        goto bad_graft_data;
 201                if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
 202                        goto bad_graft_data;
 203        }
 204        return graft;
 205}
 206
 207int read_graft_file(const char *graft_file)
 208{
 209        FILE *fp = fopen(graft_file, "r");
 210        char buf[1024];
 211        if (!fp)
 212                return -1;
 213        while (fgets(buf, sizeof(buf), fp)) {
 214                /* The format is just "Commit Parent1 Parent2 ...\n" */
 215                int len = strlen(buf);
 216                struct commit_graft *graft = read_graft_line(buf, len);
 217                if (!graft)
 218                        continue;
 219                if (register_commit_graft(graft, 1))
 220                        error("duplicate graft data: %s", buf);
 221        }
 222        fclose(fp);
 223        return 0;
 224}
 225
 226static void prepare_commit_graft(void)
 227{
 228        static int commit_graft_prepared;
 229        char *graft_file;
 230
 231        if (commit_graft_prepared)
 232                return;
 233        graft_file = get_graft_file();
 234        read_graft_file(graft_file);
 235        /* make sure shallows are read */
 236        is_repository_shallow();
 237        commit_graft_prepared = 1;
 238}
 239
 240static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
 241{
 242        int pos;
 243        prepare_commit_graft();
 244        pos = commit_graft_pos(sha1);
 245        if (pos < 0)
 246                return NULL;
 247        return commit_graft[pos];
 248}
 249
 250int write_shallow_commits(int fd, int use_pack_protocol)
 251{
 252        int i, count = 0;
 253        for (i = 0; i < commit_graft_nr; i++)
 254                if (commit_graft[i]->nr_parent < 0) {
 255                        const char *hex =
 256                                sha1_to_hex(commit_graft[i]->sha1);
 257                        count++;
 258                        if (use_pack_protocol)
 259                                packet_write(fd, "shallow %s", hex);
 260                        else {
 261                                if (write_in_full(fd, hex,  40) != 40)
 262                                        break;
 263                                if (write_in_full(fd, "\n", 1) != 1)
 264                                        break;
 265                        }
 266                }
 267        return count;
 268}
 269
 270int unregister_shallow(const unsigned char *sha1)
 271{
 272        int pos = commit_graft_pos(sha1);
 273        if (pos < 0)
 274                return -1;
 275        if (pos + 1 < commit_graft_nr)
 276                memcpy(commit_graft + pos, commit_graft + pos + 1,
 277                                sizeof(struct commit_graft *)
 278                                * (commit_graft_nr - pos - 1));
 279        commit_graft_nr--;
 280        return 0;
 281}
 282
 283int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
 284{
 285        char *tail = buffer;
 286        char *bufptr = buffer;
 287        unsigned char parent[20];
 288        struct commit_list **pptr;
 289        struct commit_graft *graft;
 290        unsigned n_refs = 0;
 291
 292        if (item->object.parsed)
 293                return 0;
 294        item->object.parsed = 1;
 295        tail += size;
 296        if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
 297                return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
 298        if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
 299                return error("bad tree pointer in commit %s",
 300                             sha1_to_hex(item->object.sha1));
 301        item->tree = lookup_tree(parent);
 302        if (item->tree)
 303                n_refs++;
 304        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
 305        pptr = &item->parents;
 306
 307        graft = lookup_commit_graft(item->object.sha1);
 308        while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
 309                struct commit *new_parent;
 310
 311                if (tail <= bufptr + 48 ||
 312                    get_sha1_hex(bufptr + 7, parent) ||
 313                    bufptr[47] != '\n')
 314                        return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
 315                bufptr += 48;
 316                if (graft)
 317                        continue;
 318                new_parent = lookup_commit(parent);
 319                if (new_parent) {
 320                        pptr = &commit_list_insert(new_parent, pptr)->next;
 321                        n_refs++;
 322                }
 323        }
 324        if (graft) {
 325                int i;
 326                struct commit *new_parent;
 327                for (i = 0; i < graft->nr_parent; i++) {
 328                        new_parent = lookup_commit(graft->parent[i]);
 329                        if (!new_parent)
 330                                continue;
 331                        pptr = &commit_list_insert(new_parent, pptr)->next;
 332                        n_refs++;
 333                }
 334        }
 335        item->date = parse_commit_date(bufptr);
 336
 337        if (track_object_refs) {
 338                unsigned i = 0;
 339                struct commit_list *p;
 340                struct object_refs *refs = alloc_object_refs(n_refs);
 341                if (item->tree)
 342                        refs->ref[i++] = &item->tree->object;
 343                for (p = item->parents; p; p = p->next)
 344                        refs->ref[i++] = &p->item->object;
 345                set_object_refs(&item->object, refs);
 346        }
 347
 348        return 0;
 349}
 350
 351int parse_commit(struct commit *item)
 352{
 353        enum object_type type;
 354        void *buffer;
 355        unsigned long size;
 356        int ret;
 357
 358        if (item->object.parsed)
 359                return 0;
 360        buffer = read_sha1_file(item->object.sha1, &type, &size);
 361        if (!buffer)
 362                return error("Could not read %s",
 363                             sha1_to_hex(item->object.sha1));
 364        if (type != OBJ_COMMIT) {
 365                free(buffer);
 366                return error("Object %s not a commit",
 367                             sha1_to_hex(item->object.sha1));
 368        }
 369        ret = parse_commit_buffer(item, buffer, size);
 370        if (save_commit_buffer && !ret) {
 371                item->buffer = buffer;
 372                return 0;
 373        }
 374        free(buffer);
 375        return ret;
 376}
 377
 378struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 379{
 380        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 381        new_list->item = item;
 382        new_list->next = *list_p;
 383        *list_p = new_list;
 384        return new_list;
 385}
 386
 387void free_commit_list(struct commit_list *list)
 388{
 389        while (list) {
 390                struct commit_list *temp = list;
 391                list = temp->next;
 392                free(temp);
 393        }
 394}
 395
 396struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
 397{
 398        struct commit_list **pp = list;
 399        struct commit_list *p;
 400        while ((p = *pp) != NULL) {
 401                if (p->item->date < item->date) {
 402                        break;
 403                }
 404                pp = &p->next;
 405        }
 406        return commit_list_insert(item, pp);
 407}
 408
 409
 410void sort_by_date(struct commit_list **list)
 411{
 412        struct commit_list *ret = NULL;
 413        while (*list) {
 414                insert_by_date((*list)->item, &ret);
 415                *list = (*list)->next;
 416        }
 417        *list = ret;
 418}
 419
 420struct commit *pop_most_recent_commit(struct commit_list **list,
 421                                      unsigned int mark)
 422{
 423        struct commit *ret = (*list)->item;
 424        struct commit_list *parents = ret->parents;
 425        struct commit_list *old = *list;
 426
 427        *list = (*list)->next;
 428        free(old);
 429
 430        while (parents) {
 431                struct commit *commit = parents->item;
 432                parse_commit(commit);
 433                if (!(commit->object.flags & mark)) {
 434                        commit->object.flags |= mark;
 435                        insert_by_date(commit, list);
 436                }
 437                parents = parents->next;
 438        }
 439        return ret;
 440}
 441
 442void clear_commit_marks(struct commit *commit, unsigned int mark)
 443{
 444        while (commit) {
 445                struct commit_list *parents;
 446
 447                if (!(mark & commit->object.flags))
 448                        return;
 449
 450                commit->object.flags &= ~mark;
 451
 452                parents = commit->parents;
 453                if (!parents)
 454                        return;
 455
 456                while ((parents = parents->next))
 457                        clear_commit_marks(parents->item, mark);
 458
 459                commit = commit->parents->item;
 460        }
 461}
 462
 463/*
 464 * Generic support for pretty-printing the header
 465 */
 466static int get_one_line(const char *msg, unsigned long len)
 467{
 468        int ret = 0;
 469
 470        while (len--) {
 471                char c = *msg++;
 472                if (!c)
 473                        break;
 474                ret++;
 475                if (c == '\n')
 476                        break;
 477        }
 478        return ret;
 479}
 480
 481/* High bit set, or ISO-2022-INT */
 482int non_ascii(int ch)
 483{
 484        ch = (ch & 0xff);
 485        return ((ch & 0x80) || (ch == 0x1b));
 486}
 487
 488static int is_rfc2047_special(char ch)
 489{
 490        return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 491}
 492
 493static int add_rfc2047(char *buf, const char *line, int len,
 494                       const char *encoding)
 495{
 496        char *bp = buf;
 497        int i, needquote;
 498        char q_encoding[128];
 499        const char *q_encoding_fmt = "=?%s?q?";
 500
 501        for (i = needquote = 0; !needquote && i < len; i++) {
 502                int ch = line[i];
 503                if (non_ascii(ch))
 504                        needquote++;
 505                if ((i + 1 < len) &&
 506                    (ch == '=' && line[i+1] == '?'))
 507                        needquote++;
 508        }
 509        if (!needquote)
 510                return sprintf(buf, "%.*s", len, line);
 511
 512        i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
 513        if (sizeof(q_encoding) < i)
 514                die("Insanely long encoding name %s", encoding);
 515        memcpy(bp, q_encoding, i);
 516        bp += i;
 517        for (i = 0; i < len; i++) {
 518                unsigned ch = line[i] & 0xFF;
 519                /*
 520                 * We encode ' ' using '=20' even though rfc2047
 521                 * allows using '_' for readability.  Unfortunately,
 522                 * many programs do not understand this and just
 523                 * leave the underscore in place.
 524                 */
 525                if (is_rfc2047_special(ch) || ch == ' ') {
 526                        sprintf(bp, "=%02X", ch);
 527                        bp += 3;
 528                }
 529                else
 530                        *bp++ = ch;
 531        }
 532        memcpy(bp, "?=", 2);
 533        bp += 2;
 534        return bp - buf;
 535}
 536
 537static unsigned long bound_rfc2047(unsigned long len, const char *encoding)
 538{
 539        /* upper bound of q encoded string of length 'len' */
 540        unsigned long elen = strlen(encoding);
 541
 542        return len * 3 + elen + 100;
 543}
 544
 545static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
 546                         const char *line, enum date_mode dmode,
 547                         const char *encoding)
 548{
 549        char *date;
 550        int namelen;
 551        unsigned long time;
 552        int tz, ret;
 553        const char *filler = "    ";
 554
 555        if (fmt == CMIT_FMT_ONELINE)
 556                return 0;
 557        date = strchr(line, '>');
 558        if (!date)
 559                return 0;
 560        namelen = ++date - line;
 561        time = strtoul(date, &date, 10);
 562        tz = strtol(date, NULL, 10);
 563
 564        if (fmt == CMIT_FMT_EMAIL) {
 565                char *name_tail = strchr(line, '<');
 566                int display_name_length;
 567                if (!name_tail)
 568                        return 0;
 569                while (line < name_tail && isspace(name_tail[-1]))
 570                        name_tail--;
 571                display_name_length = name_tail - line;
 572                filler = "";
 573                strcpy(buf, "From: ");
 574                ret = strlen(buf);
 575                ret += add_rfc2047(buf + ret, line, display_name_length,
 576                                   encoding);
 577                memcpy(buf + ret, name_tail, namelen - display_name_length);
 578                ret += namelen - display_name_length;
 579                buf[ret++] = '\n';
 580        }
 581        else {
 582                ret = sprintf(buf, "%s: %.*s%.*s\n", what,
 583                              (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 584                              filler, namelen, line);
 585        }
 586        switch (fmt) {
 587        case CMIT_FMT_MEDIUM:
 588                ret += sprintf(buf + ret, "Date:   %s\n",
 589                               show_date(time, tz, dmode));
 590                break;
 591        case CMIT_FMT_EMAIL:
 592                ret += sprintf(buf + ret, "Date: %s\n",
 593                               show_date(time, tz, DATE_RFC2822));
 594                break;
 595        case CMIT_FMT_FULLER:
 596                ret += sprintf(buf + ret, "%sDate: %s\n", what,
 597                               show_date(time, tz, dmode));
 598                break;
 599        default:
 600                /* notin' */
 601                break;
 602        }
 603        return ret;
 604}
 605
 606static int is_empty_line(const char *line, int *len_p)
 607{
 608        int len = *len_p;
 609        while (len && isspace(line[len-1]))
 610                len--;
 611        *len_p = len;
 612        return !len;
 613}
 614
 615static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
 616{
 617        struct commit_list *parent = commit->parents;
 618        int offset;
 619
 620        if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 621            !parent || !parent->next)
 622                return 0;
 623
 624        offset = sprintf(buf, "Merge:");
 625
 626        while (parent) {
 627                struct commit *p = parent->item;
 628                const char *hex = NULL;
 629                const char *dots;
 630                if (abbrev)
 631                        hex = find_unique_abbrev(p->object.sha1, abbrev);
 632                if (!hex)
 633                        hex = sha1_to_hex(p->object.sha1);
 634                dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 635                parent = parent->next;
 636
 637                offset += sprintf(buf + offset, " %s%s", hex, dots);
 638        }
 639        buf[offset++] = '\n';
 640        return offset;
 641}
 642
 643static char *get_header(const struct commit *commit, const char *key)
 644{
 645        int key_len = strlen(key);
 646        const char *line = commit->buffer;
 647
 648        for (;;) {
 649                const char *eol = strchr(line, '\n'), *next;
 650
 651                if (line == eol)
 652                        return NULL;
 653                if (!eol) {
 654                        eol = line + strlen(line);
 655                        next = NULL;
 656                } else
 657                        next = eol + 1;
 658                if (eol - line > key_len &&
 659                    !strncmp(line, key, key_len) &&
 660                    line[key_len] == ' ') {
 661                        int len = eol - line - key_len;
 662                        char *ret = xmalloc(len);
 663                        memcpy(ret, line + key_len + 1, len - 1);
 664                        ret[len - 1] = '\0';
 665                        return ret;
 666                }
 667                line = next;
 668        }
 669}
 670
 671static char *replace_encoding_header(char *buf, const char *encoding)
 672{
 673        char *encoding_header = strstr(buf, "\nencoding ");
 674        char *header_end = strstr(buf, "\n\n");
 675        char *end_of_encoding_header;
 676        int encoding_header_pos;
 677        int encoding_header_len;
 678        int new_len;
 679        int need_len;
 680        int buflen = strlen(buf) + 1;
 681
 682        if (!header_end)
 683                header_end = buf + buflen;
 684        if (!encoding_header || encoding_header >= header_end)
 685                return buf;
 686        encoding_header++;
 687        end_of_encoding_header = strchr(encoding_header, '\n');
 688        if (!end_of_encoding_header)
 689                return buf; /* should not happen but be defensive */
 690        end_of_encoding_header++;
 691
 692        encoding_header_len = end_of_encoding_header - encoding_header;
 693        encoding_header_pos = encoding_header - buf;
 694
 695        if (is_encoding_utf8(encoding)) {
 696                /* we have re-coded to UTF-8; drop the header */
 697                memmove(encoding_header, end_of_encoding_header,
 698                        buflen - (encoding_header_pos + encoding_header_len));
 699                return buf;
 700        }
 701        new_len = strlen(encoding);
 702        need_len = new_len + strlen("encoding \n");
 703        if (encoding_header_len < need_len) {
 704                buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
 705                encoding_header = buf + encoding_header_pos;
 706                end_of_encoding_header = encoding_header + encoding_header_len;
 707        }
 708        memmove(end_of_encoding_header + (need_len - encoding_header_len),
 709                end_of_encoding_header,
 710                buflen - (encoding_header_pos + encoding_header_len));
 711        memcpy(encoding_header + 9, encoding, strlen(encoding));
 712        encoding_header[9 + new_len] = '\n';
 713        return buf;
 714}
 715
 716static char *logmsg_reencode(const struct commit *commit,
 717                             const char *output_encoding)
 718{
 719        static const char *utf8 = "utf-8";
 720        const char *use_encoding;
 721        char *encoding;
 722        char *out;
 723
 724        if (!*output_encoding)
 725                return NULL;
 726        encoding = get_header(commit, "encoding");
 727        use_encoding = encoding ? encoding : utf8;
 728        if (!strcmp(use_encoding, output_encoding))
 729                if (encoding) /* we'll strip encoding header later */
 730                        out = xstrdup(commit->buffer);
 731                else
 732                        return NULL; /* nothing to do */
 733        else
 734                out = reencode_string(commit->buffer,
 735                                      output_encoding, use_encoding);
 736        if (out)
 737                out = replace_encoding_header(out, output_encoding);
 738
 739        free(encoding);
 740        return out;
 741}
 742
 743static void fill_person(struct interp *table, const char *msg, int len)
 744{
 745        int start, end, tz = 0;
 746        unsigned long date;
 747        char *ep;
 748
 749        /* parse name */
 750        for (end = 0; end < len && msg[end] != '<'; end++)
 751                ; /* do nothing */
 752        start = end + 1;
 753        while (end > 0 && isspace(msg[end - 1]))
 754                end--;
 755        table[0].value = xstrndup(msg, end);
 756
 757        if (start >= len)
 758                return;
 759
 760        /* parse email */
 761        for (end = start + 1; end < len && msg[end] != '>'; end++)
 762                ; /* do nothing */
 763
 764        if (end >= len)
 765                return;
 766
 767        table[1].value = xstrndup(msg + start, end - start);
 768
 769        /* parse date */
 770        for (start = end + 1; start < len && isspace(msg[start]); start++)
 771                ; /* do nothing */
 772        if (start >= len)
 773                return;
 774        date = strtoul(msg + start, &ep, 10);
 775        if (msg + start == ep)
 776                return;
 777
 778        table[5].value = xstrndup(msg + start, ep - (msg + start));
 779
 780        /* parse tz */
 781        for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
 782                ; /* do nothing */
 783        if (start + 1 < len) {
 784                tz = strtoul(msg + start + 1, NULL, 10);
 785                if (msg[start] == '-')
 786                        tz = -tz;
 787        }
 788
 789        interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
 790        interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
 791        interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
 792        interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
 793}
 794
 795static long format_commit_message(const struct commit *commit,
 796                const char *msg, char **buf_p, unsigned long *space_p)
 797{
 798        struct interp table[] = {
 799                { "%H" },       /* commit hash */
 800                { "%h" },       /* abbreviated commit hash */
 801                { "%T" },       /* tree hash */
 802                { "%t" },       /* abbreviated tree hash */
 803                { "%P" },       /* parent hashes */
 804                { "%p" },       /* abbreviated parent hashes */
 805                { "%an" },      /* author name */
 806                { "%ae" },      /* author email */
 807                { "%ad" },      /* author date */
 808                { "%aD" },      /* author date, RFC2822 style */
 809                { "%ar" },      /* author date, relative */
 810                { "%at" },      /* author date, UNIX timestamp */
 811                { "%ai" },      /* author date, ISO 8601 */
 812                { "%cn" },      /* committer name */
 813                { "%ce" },      /* committer email */
 814                { "%cd" },      /* committer date */
 815                { "%cD" },      /* committer date, RFC2822 style */
 816                { "%cr" },      /* committer date, relative */
 817                { "%ct" },      /* committer date, UNIX timestamp */
 818                { "%ci" },      /* committer date, ISO 8601 */
 819                { "%e" },       /* encoding */
 820                { "%s" },       /* subject */
 821                { "%b" },       /* body */
 822                { "%Cred" },    /* red */
 823                { "%Cgreen" },  /* green */
 824                { "%Cblue" },   /* blue */
 825                { "%Creset" },  /* reset color */
 826                { "%n" },       /* newline */
 827                { "%m" },       /* left/right/bottom */
 828        };
 829        enum interp_index {
 830                IHASH = 0, IHASH_ABBREV,
 831                ITREE, ITREE_ABBREV,
 832                IPARENTS, IPARENTS_ABBREV,
 833                IAUTHOR_NAME, IAUTHOR_EMAIL,
 834                IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
 835                IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
 836                ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 837                ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 838                ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
 839                ICOMMITTER_ISO8601,
 840                IENCODING,
 841                ISUBJECT,
 842                IBODY,
 843                IRED, IGREEN, IBLUE, IRESET_COLOR,
 844                INEWLINE,
 845                ILEFT_RIGHT,
 846        };
 847        struct commit_list *p;
 848        char parents[1024];
 849        int i;
 850        enum { HEADER, SUBJECT, BODY } state;
 851
 852        if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 853                die("invalid interp table!");
 854
 855        /* these are independent of the commit */
 856        interp_set_entry(table, IRED, "\033[31m");
 857        interp_set_entry(table, IGREEN, "\033[32m");
 858        interp_set_entry(table, IBLUE, "\033[34m");
 859        interp_set_entry(table, IRESET_COLOR, "\033[m");
 860        interp_set_entry(table, INEWLINE, "\n");
 861
 862        /* these depend on the commit */
 863        if (!commit->object.parsed)
 864                parse_object(commit->object.sha1);
 865        interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1));
 866        interp_set_entry(table, IHASH_ABBREV,
 867                        find_unique_abbrev(commit->object.sha1,
 868                                DEFAULT_ABBREV));
 869        interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1));
 870        interp_set_entry(table, ITREE_ABBREV,
 871                        find_unique_abbrev(commit->tree->object.sha1,
 872                                DEFAULT_ABBREV));
 873        interp_set_entry(table, ILEFT_RIGHT,
 874                         (commit->object.flags & BOUNDARY)
 875                         ? "-"
 876                         : (commit->object.flags & SYMMETRIC_LEFT)
 877                         ? "<"
 878                         : ">");
 879
 880        parents[1] = 0;
 881        for (i = 0, p = commit->parents;
 882                        p && i < sizeof(parents) - 1;
 883                        p = p->next)
 884                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 885                        sha1_to_hex(p->item->object.sha1));
 886        interp_set_entry(table, IPARENTS, parents + 1);
 887
 888        parents[1] = 0;
 889        for (i = 0, p = commit->parents;
 890                        p && i < sizeof(parents) - 1;
 891                        p = p->next)
 892                i += snprintf(parents + i, sizeof(parents) - i - 1, " %s",
 893                        find_unique_abbrev(p->item->object.sha1,
 894                                DEFAULT_ABBREV));
 895        interp_set_entry(table, IPARENTS_ABBREV, parents + 1);
 896
 897        for (i = 0, state = HEADER; msg[i] && state < BODY; i++) {
 898                int eol;
 899                for (eol = i; msg[eol] && msg[eol] != '\n'; eol++)
 900                        ; /* do nothing */
 901
 902                if (state == SUBJECT) {
 903                        table[ISUBJECT].value = xstrndup(msg + i, eol - i);
 904                        i = eol;
 905                }
 906                if (i == eol) {
 907                        state++;
 908                        /* strip empty lines */
 909                        while (msg[eol + 1] == '\n')
 910                                eol++;
 911                } else if (!prefixcmp(msg + i, "author "))
 912                        fill_person(table + IAUTHOR_NAME,
 913                                        msg + i + 7, eol - i - 7);
 914                else if (!prefixcmp(msg + i, "committer "))
 915                        fill_person(table + ICOMMITTER_NAME,
 916                                        msg + i + 10, eol - i - 10);
 917                else if (!prefixcmp(msg + i, "encoding "))
 918                        table[IENCODING].value =
 919                                xstrndup(msg + i + 9, eol - i - 9);
 920                i = eol;
 921        }
 922        if (msg[i])
 923                table[IBODY].value = xstrdup(msg + i);
 924        for (i = 0; i < ARRAY_SIZE(table); i++)
 925                if (!table[i].value)
 926                        interp_set_entry(table, i, "<unknown>");
 927
 928        do {
 929                char *buf = *buf_p;
 930                unsigned long space = *space_p;
 931
 932                space = interpolate(buf, space, user_format,
 933                                    table, ARRAY_SIZE(table));
 934                if (!space)
 935                        break;
 936                buf = xrealloc(buf, space);
 937                *buf_p = buf;
 938                *space_p = space;
 939        } while (1);
 940        interp_clear_table(table, ARRAY_SIZE(table));
 941
 942        return strlen(*buf_p);
 943}
 944
 945static void pp_header(enum cmit_fmt fmt,
 946                      int abbrev,
 947                      enum date_mode dmode,
 948                      const char *encoding,
 949                      const struct commit *commit,
 950                      const char **msg_p,
 951                      unsigned long *len_p,
 952                      unsigned long *ofs_p,
 953                      char **buf_p,
 954                      unsigned long *space_p)
 955{
 956        int parents_shown = 0;
 957
 958        for (;;) {
 959                const char *line = *msg_p;
 960                char *dst;
 961                int linelen = get_one_line(*msg_p, *len_p);
 962                unsigned long len;
 963
 964                if (!linelen)
 965                        return;
 966                *msg_p += linelen;
 967                *len_p -= linelen;
 968
 969                if (linelen == 1)
 970                        /* End of header */
 971                        return;
 972
 973                ALLOC_GROW(*buf_p, linelen + *ofs_p + 20, *space_p);
 974                dst = *buf_p + *ofs_p;
 975
 976                if (fmt == CMIT_FMT_RAW) {
 977                        memcpy(dst, line, linelen);
 978                        *ofs_p += linelen;
 979                        continue;
 980                }
 981
 982                if (!memcmp(line, "parent ", 7)) {
 983                        if (linelen != 48)
 984                                die("bad parent line in commit");
 985                        continue;
 986                }
 987
 988                if (!parents_shown) {
 989                        struct commit_list *parent;
 990                        int num;
 991                        for (parent = commit->parents, num = 0;
 992                             parent;
 993                             parent = parent->next, num++)
 994                                ;
 995                        /* with enough slop */
 996                        num = *ofs_p + num * 50 + 20;
 997                        ALLOC_GROW(*buf_p, num, *space_p);
 998                        dst = *buf_p + *ofs_p;
 999                        *ofs_p += add_merge_info(fmt, dst, commit, abbrev);
1000                        parents_shown = 1;
1001                }
1002
1003                /*
1004                 * MEDIUM == DEFAULT shows only author with dates.
1005                 * FULL shows both authors but not dates.
1006                 * FULLER shows both authors and dates.
1007                 */
1008                if (!memcmp(line, "author ", 7)) {
1009                        len = linelen;
1010                        if (fmt == CMIT_FMT_EMAIL)
1011                                len = bound_rfc2047(linelen, encoding);
1012                        ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
1013                        dst = *buf_p + *ofs_p;
1014                        *ofs_p += add_user_info("Author", fmt, dst,
1015                                                line + 7, dmode, encoding);
1016                }
1017
1018                if (!memcmp(line, "committer ", 10) &&
1019                    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
1020                        len = linelen;
1021                        if (fmt == CMIT_FMT_EMAIL)
1022                                len = bound_rfc2047(linelen, encoding);
1023                        ALLOC_GROW(*buf_p, *ofs_p + len + 80, *space_p);
1024                        dst = *buf_p + *ofs_p;
1025                        *ofs_p += add_user_info("Commit", fmt, dst,
1026                                                line + 10, dmode, encoding);
1027                }
1028        }
1029}
1030
1031static void pp_title_line(enum cmit_fmt fmt,
1032                          const char **msg_p,
1033                          unsigned long *len_p,
1034                          unsigned long *ofs_p,
1035                          char **buf_p,
1036                          unsigned long *space_p,
1037                          int indent,
1038                          const char *subject,
1039                          const char *after_subject,
1040                          const char *encoding,
1041                          int plain_non_ascii)
1042{
1043        char *title;
1044        unsigned long title_alloc, title_len;
1045        unsigned long len;
1046
1047        title_len = 0;
1048        title_alloc = 80;
1049        title = xmalloc(title_alloc);
1050        for (;;) {
1051                const char *line = *msg_p;
1052                int linelen = get_one_line(line, *len_p);
1053                *msg_p += linelen;
1054                *len_p -= linelen;
1055
1056                if (!linelen || is_empty_line(line, &linelen))
1057                        break;
1058
1059                if (title_alloc <= title_len + linelen + 2) {
1060                        title_alloc = title_len + linelen + 80;
1061                        title = xrealloc(title, title_alloc);
1062                }
1063                len = 0;
1064                if (title_len) {
1065                        if (fmt == CMIT_FMT_EMAIL) {
1066                                len++;
1067                                title[title_len++] = '\n';
1068                        }
1069                        len++;
1070                        title[title_len++] = ' ';
1071                }
1072                memcpy(title + title_len, line, linelen);
1073                title_len += linelen;
1074        }
1075
1076        /* Enough slop for the MIME header and rfc2047 */
1077        len = bound_rfc2047(title_len, encoding)+ 1000;
1078        if (subject)
1079                len += strlen(subject);
1080        if (after_subject)
1081                len += strlen(after_subject);
1082        if (encoding)
1083                len += strlen(encoding);
1084        ALLOC_GROW(*buf_p, title_len + *ofs_p + len, *space_p);
1085
1086        if (subject) {
1087                len = strlen(subject);
1088                memcpy(*buf_p + *ofs_p, subject, len);
1089                *ofs_p += len;
1090                *ofs_p += add_rfc2047(*buf_p + *ofs_p,
1091                                      title, title_len, encoding);
1092        } else {
1093                memcpy(*buf_p + *ofs_p, title, title_len);
1094                *ofs_p += title_len;
1095        }
1096        (*buf_p)[(*ofs_p)++] = '\n';
1097        if (plain_non_ascii) {
1098                const char *header_fmt =
1099                        "MIME-Version: 1.0\n"
1100                        "Content-Type: text/plain; charset=%s\n"
1101                        "Content-Transfer-Encoding: 8bit\n";
1102                *ofs_p += snprintf(*buf_p + *ofs_p,
1103                                   *space_p - *ofs_p,
1104                                   header_fmt, encoding);
1105        }
1106        if (after_subject) {
1107                len = strlen(after_subject);
1108                memcpy(*buf_p + *ofs_p, after_subject, len);
1109                *ofs_p += len;
1110        }
1111        free(title);
1112        if (fmt == CMIT_FMT_EMAIL) {
1113                ALLOC_GROW(*buf_p, *ofs_p + 20, *space_p);
1114                (*buf_p)[(*ofs_p)++] = '\n';
1115        }
1116}
1117
1118static void pp_remainder(enum cmit_fmt fmt,
1119                         const char **msg_p,
1120                         unsigned long *len_p,
1121                         unsigned long *ofs_p,
1122                         char **buf_p,
1123                         unsigned long *space_p,
1124                         int indent)
1125{
1126        int first = 1;
1127        for (;;) {
1128                const char *line = *msg_p;
1129                int linelen = get_one_line(line, *len_p);
1130                *msg_p += linelen;
1131                *len_p -= linelen;
1132
1133                if (!linelen)
1134                        break;
1135
1136                if (is_empty_line(line, &linelen)) {
1137                        if (first)
1138                                continue;
1139                        if (fmt == CMIT_FMT_SHORT)
1140                                break;
1141                }
1142                first = 0;
1143
1144                ALLOC_GROW(*buf_p, *ofs_p + linelen + indent + 20, *space_p);
1145                if (indent) {
1146                        memset(*buf_p + *ofs_p, ' ', indent);
1147                        *ofs_p += indent;
1148                }
1149                memcpy(*buf_p + *ofs_p, line, linelen);
1150                *ofs_p += linelen;
1151                (*buf_p)[(*ofs_p)++] = '\n';
1152        }
1153}
1154
1155unsigned long pretty_print_commit(enum cmit_fmt fmt,
1156                                  const struct commit *commit,
1157                                  unsigned long len,
1158                                  char **buf_p, unsigned long *space_p,
1159                                  int abbrev, const char *subject,
1160                                  const char *after_subject,
1161                                  enum date_mode dmode,
1162                                  int plain_non_ascii)
1163{
1164        unsigned long offset = 0;
1165        unsigned long beginning_of_body;
1166        int indent = 4;
1167        const char *msg = commit->buffer;
1168        char *reencoded;
1169        const char *encoding;
1170        char *buf;
1171
1172        if (fmt == CMIT_FMT_USERFORMAT)
1173                return format_commit_message(commit, msg, buf_p, space_p);
1174
1175        encoding = (git_log_output_encoding
1176                    ? git_log_output_encoding
1177                    : git_commit_encoding);
1178        if (!encoding)
1179                encoding = "utf-8";
1180        reencoded = logmsg_reencode(commit, encoding);
1181        if (reencoded) {
1182                msg = reencoded;
1183                len = strlen(reencoded);
1184        }
1185
1186        if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
1187                indent = 0;
1188
1189        /* After-subject is used to pass in Content-Type: multipart
1190         * MIME header; in that case we do not have to do the
1191         * plaintext content type even if the commit message has
1192         * non 7-bit ASCII character.  Otherwise, check if we need
1193         * to say this is not a 7-bit ASCII.
1194         */
1195        if (fmt == CMIT_FMT_EMAIL && !after_subject) {
1196                int i, ch, in_body;
1197
1198                for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
1199                        if (!in_body) {
1200                                /* author could be non 7-bit ASCII but
1201                                 * the log may be so; skip over the
1202                                 * header part first.
1203                                 */
1204                                if (ch == '\n' &&
1205                                    i + 1 < len && msg[i+1] == '\n')
1206                                        in_body = 1;
1207                        }
1208                        else if (non_ascii(ch)) {
1209                                plain_non_ascii = 1;
1210                                break;
1211                        }
1212                }
1213        }
1214
1215        pp_header(fmt, abbrev, dmode, encoding,
1216                  commit, &msg, &len,
1217                  &offset, buf_p, space_p);
1218        if (fmt != CMIT_FMT_ONELINE && !subject) {
1219                ALLOC_GROW(*buf_p, offset + 20, *space_p);
1220                (*buf_p)[offset++] = '\n';
1221        }
1222
1223        /* Skip excess blank lines at the beginning of body, if any... */
1224        for (;;) {
1225                int linelen = get_one_line(msg, len);
1226                int ll = linelen;
1227                if (!linelen)
1228                        break;
1229                if (!is_empty_line(msg, &ll))
1230                        break;
1231                msg += linelen;
1232                len -= linelen;
1233        }
1234
1235        /* These formats treat the title line specially. */
1236        if (fmt == CMIT_FMT_ONELINE
1237            || fmt == CMIT_FMT_EMAIL)
1238                pp_title_line(fmt, &msg, &len, &offset,
1239                              buf_p, space_p, indent,
1240                              subject, after_subject, encoding,
1241                              plain_non_ascii);
1242
1243        beginning_of_body = offset;
1244        if (fmt != CMIT_FMT_ONELINE)
1245                pp_remainder(fmt, &msg, &len, &offset,
1246                             buf_p, space_p, indent);
1247
1248        while (offset && isspace((*buf_p)[offset-1]))
1249                offset--;
1250
1251        ALLOC_GROW(*buf_p, offset + 20, *space_p);
1252        buf = *buf_p;
1253
1254        /* Make sure there is an EOLN for the non-oneline case */
1255        if (fmt != CMIT_FMT_ONELINE)
1256                buf[offset++] = '\n';
1257
1258        /*
1259         * The caller may append additional body text in e-mail
1260         * format.  Make sure we did not strip the blank line
1261         * between the header and the body.
1262         */
1263        if (fmt == CMIT_FMT_EMAIL && offset <= beginning_of_body)
1264                buf[offset++] = '\n';
1265        buf[offset] = '\0';
1266        free(reencoded);
1267        return offset;
1268}
1269
1270struct commit *pop_commit(struct commit_list **stack)
1271{
1272        struct commit_list *top = *stack;
1273        struct commit *item = top ? top->item : NULL;
1274
1275        if (top) {
1276                *stack = top->next;
1277                free(top);
1278        }
1279        return item;
1280}
1281
1282void topo_sort_default_setter(struct commit *c, void *data)
1283{
1284        c->util = data;
1285}
1286
1287void *topo_sort_default_getter(struct commit *c)
1288{
1289        return c->util;
1290}
1291
1292/*
1293 * Performs an in-place topological sort on the list supplied.
1294 */
1295void sort_in_topological_order(struct commit_list ** list, int lifo)
1296{
1297        sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
1298                                     topo_sort_default_getter);
1299}
1300
1301void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
1302                                  topo_sort_set_fn_t setter,
1303                                  topo_sort_get_fn_t getter)
1304{
1305        struct commit_list * next = *list;
1306        struct commit_list * work = NULL, **insert;
1307        struct commit_list ** pptr = list;
1308        struct sort_node * nodes;
1309        struct sort_node * next_nodes;
1310        int count = 0;
1311
1312        /* determine the size of the list */
1313        while (next) {
1314                next = next->next;
1315                count++;
1316        }
1317
1318        if (!count)
1319                return;
1320        /* allocate an array to help sort the list */
1321        nodes = xcalloc(count, sizeof(*nodes));
1322        /* link the list to the array */
1323        next_nodes = nodes;
1324        next=*list;
1325        while (next) {
1326                next_nodes->list_item = next;
1327                setter(next->item, next_nodes);
1328                next_nodes++;
1329                next = next->next;
1330        }
1331        /* update the indegree */
1332        next=*list;
1333        while (next) {
1334                struct commit_list * parents = next->item->parents;
1335                while (parents) {
1336                        struct commit * parent=parents->item;
1337                        struct sort_node * pn = (struct sort_node *) getter(parent);
1338
1339                        if (pn)
1340                                pn->indegree++;
1341                        parents=parents->next;
1342                }
1343                next=next->next;
1344        }
1345        /*
1346         * find the tips
1347         *
1348         * tips are nodes not reachable from any other node in the list
1349         *
1350         * the tips serve as a starting set for the work queue.
1351         */
1352        next=*list;
1353        insert = &work;
1354        while (next) {
1355                struct sort_node * node = (struct sort_node *) getter(next->item);
1356
1357                if (node->indegree == 0) {
1358                        insert = &commit_list_insert(next->item, insert)->next;
1359                }
1360                next=next->next;
1361        }
1362
1363        /* process the list in topological order */
1364        if (!lifo)
1365                sort_by_date(&work);
1366        while (work) {
1367                struct commit * work_item = pop_commit(&work);
1368                struct sort_node * work_node = (struct sort_node *) getter(work_item);
1369                struct commit_list * parents = work_item->parents;
1370
1371                while (parents) {
1372                        struct commit * parent=parents->item;
1373                        struct sort_node * pn = (struct sort_node *) getter(parent);
1374
1375                        if (pn) {
1376                                /*
1377                                 * parents are only enqueued for emission
1378                                 * when all their children have been emitted thereby
1379                                 * guaranteeing topological order.
1380                                 */
1381                                pn->indegree--;
1382                                if (!pn->indegree) {
1383                                        if (!lifo)
1384                                                insert_by_date(parent, &work);
1385                                        else
1386                                                commit_list_insert(parent, &work);
1387                                }
1388                        }
1389                        parents=parents->next;
1390                }
1391                /*
1392                 * work_item is a commit all of whose children
1393                 * have already been emitted. we can emit it now.
1394                 */
1395                *pptr = work_node->list_item;
1396                pptr = &(*pptr)->next;
1397                *pptr = NULL;
1398                setter(work_item, NULL);
1399        }
1400        free(nodes);
1401}
1402
1403/* merge-base stuff */
1404
1405/* bits #0..15 in revision.h */
1406#define PARENT1         (1u<<16)
1407#define PARENT2         (1u<<17)
1408#define STALE           (1u<<18)
1409#define RESULT          (1u<<19)
1410
1411static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
1412
1413static struct commit *interesting(struct commit_list *list)
1414{
1415        while (list) {
1416                struct commit *commit = list->item;
1417                list = list->next;
1418                if (commit->object.flags & STALE)
1419                        continue;
1420                return commit;
1421        }
1422        return NULL;
1423}
1424
1425static struct commit_list *merge_bases(struct commit *one, struct commit *two)
1426{
1427        struct commit_list *list = NULL;
1428        struct commit_list *result = NULL;
1429
1430        if (one == two)
1431                /* We do not mark this even with RESULT so we do not
1432                 * have to clean it up.
1433                 */
1434                return commit_list_insert(one, &result);
1435
1436        parse_commit(one);
1437        parse_commit(two);
1438
1439        one->object.flags |= PARENT1;
1440        two->object.flags |= PARENT2;
1441        insert_by_date(one, &list);
1442        insert_by_date(two, &list);
1443
1444        while (interesting(list)) {
1445                struct commit *commit;
1446                struct commit_list *parents;
1447                struct commit_list *n;
1448                int flags;
1449
1450                commit = list->item;
1451                n = list->next;
1452                free(list);
1453                list = n;
1454
1455                flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
1456                if (flags == (PARENT1 | PARENT2)) {
1457                        if (!(commit->object.flags & RESULT)) {
1458                                commit->object.flags |= RESULT;
1459                                insert_by_date(commit, &result);
1460                        }
1461                        /* Mark parents of a found merge stale */
1462                        flags |= STALE;
1463                }
1464                parents = commit->parents;
1465                while (parents) {
1466                        struct commit *p = parents->item;
1467                        parents = parents->next;
1468                        if ((p->object.flags & flags) == flags)
1469                                continue;
1470                        parse_commit(p);
1471                        p->object.flags |= flags;
1472                        insert_by_date(p, &list);
1473                }
1474        }
1475
1476        /* Clean up the result to remove stale ones */
1477        free_commit_list(list);
1478        list = result; result = NULL;
1479        while (list) {
1480                struct commit_list *n = list->next;
1481                if (!(list->item->object.flags & STALE))
1482                        insert_by_date(list->item, &result);
1483                free(list);
1484                list = n;
1485        }
1486        return result;
1487}
1488
1489struct commit_list *get_merge_bases(struct commit *one,
1490                                    struct commit *two,
1491                                    int cleanup)
1492{
1493        struct commit_list *list;
1494        struct commit **rslt;
1495        struct commit_list *result;
1496        int cnt, i, j;
1497
1498        result = merge_bases(one, two);
1499        if (one == two)
1500                return result;
1501        if (!result || !result->next) {
1502                if (cleanup) {
1503                        clear_commit_marks(one, all_flags);
1504                        clear_commit_marks(two, all_flags);
1505                }
1506                return result;
1507        }
1508
1509        /* There are more than one */
1510        cnt = 0;
1511        list = result;
1512        while (list) {
1513                list = list->next;
1514                cnt++;
1515        }
1516        rslt = xcalloc(cnt, sizeof(*rslt));
1517        for (list = result, i = 0; list; list = list->next)
1518                rslt[i++] = list->item;
1519        free_commit_list(result);
1520
1521        clear_commit_marks(one, all_flags);
1522        clear_commit_marks(two, all_flags);
1523        for (i = 0; i < cnt - 1; i++) {
1524                for (j = i+1; j < cnt; j++) {
1525                        if (!rslt[i] || !rslt[j])
1526                                continue;
1527                        result = merge_bases(rslt[i], rslt[j]);
1528                        clear_commit_marks(rslt[i], all_flags);
1529                        clear_commit_marks(rslt[j], all_flags);
1530                        for (list = result; list; list = list->next) {
1531                                if (rslt[i] == list->item)
1532                                        rslt[i] = NULL;
1533                                if (rslt[j] == list->item)
1534                                        rslt[j] = NULL;
1535                        }
1536                }
1537        }
1538
1539        /* Surviving ones in rslt[] are the independent results */
1540        result = NULL;
1541        for (i = 0; i < cnt; i++) {
1542                if (rslt[i])
1543                        insert_by_date(rslt[i], &result);
1544        }
1545        free(rslt);
1546        return result;
1547}
1548
1549int in_merge_bases(struct commit *commit, struct commit **reference, int num)
1550{
1551        struct commit_list *bases, *b;
1552        int ret = 0;
1553
1554        if (num == 1)
1555                bases = get_merge_bases(commit, *reference, 1);
1556        else
1557                die("not yet");
1558        for (b = bases; b; b = b->next) {
1559                if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
1560                        ret = 1;
1561                        break;
1562                }
1563        }
1564
1565        free_commit_list(bases);
1566        return ret;
1567}