mailinfo.con commit Merge branch 'rs/strbuf-remove-fix' (3ba0bbb)
   1#include "cache.h"
   2#include "utf8.h"
   3#include "strbuf.h"
   4#include "mailinfo.h"
   5
   6static void cleanup_space(struct strbuf *sb)
   7{
   8        size_t pos, cnt;
   9        for (pos = 0; pos < sb->len; pos++) {
  10                if (isspace(sb->buf[pos])) {
  11                        sb->buf[pos] = ' ';
  12                        for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
  13                        strbuf_remove(sb, pos + 1, cnt);
  14                }
  15        }
  16}
  17
  18static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
  19{
  20        struct strbuf *src = name;
  21        if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
  22                strchr(name->buf, '<') || strchr(name->buf, '>'))
  23                src = email;
  24        else if (name == out)
  25                return;
  26        strbuf_reset(out);
  27        strbuf_addbuf(out, src);
  28}
  29
  30static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
  31{
  32        /* John Doe <johndoe> */
  33
  34        char *bra, *ket;
  35        /* This is fallback, so do not bother if we already have an
  36         * e-mail address.
  37         */
  38        if (mi->email.len)
  39                return;
  40
  41        bra = strchr(line->buf, '<');
  42        if (!bra)
  43                return;
  44        ket = strchr(bra, '>');
  45        if (!ket)
  46                return;
  47
  48        strbuf_reset(&mi->email);
  49        strbuf_add(&mi->email, bra + 1, ket - bra - 1);
  50
  51        strbuf_reset(&mi->name);
  52        strbuf_add(&mi->name, line->buf, bra - line->buf);
  53        strbuf_trim(&mi->name);
  54        get_sane_name(&mi->name, &mi->name, &mi->email);
  55}
  56
  57static void handle_from(struct mailinfo *mi, const struct strbuf *from)
  58{
  59        char *at;
  60        size_t el;
  61        struct strbuf f;
  62
  63        strbuf_init(&f, from->len);
  64        strbuf_addbuf(&f, from);
  65
  66        at = strchr(f.buf, '@');
  67        if (!at) {
  68                parse_bogus_from(mi, from);
  69                return;
  70        }
  71
  72        /*
  73         * If we already have one email, don't take any confusing lines
  74         */
  75        if (mi->email.len && strchr(at + 1, '@')) {
  76                strbuf_release(&f);
  77                return;
  78        }
  79
  80        /* Pick up the string around '@', possibly delimited with <>
  81         * pair; that is the email part.
  82         */
  83        while (at > f.buf) {
  84                char c = at[-1];
  85                if (isspace(c))
  86                        break;
  87                if (c == '<') {
  88                        at[-1] = ' ';
  89                        break;
  90                }
  91                at--;
  92        }
  93        el = strcspn(at, " \n\t\r\v\f>");
  94        strbuf_reset(&mi->email);
  95        strbuf_add(&mi->email, at, el);
  96        strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
  97
  98        /* The remainder is name.  It could be
  99         *
 100         * - "John Doe <john.doe@xz>"                   (a), or
 101         * - "john.doe@xz (John Doe)"                   (b), or
 102         * - "John (zzz) Doe <john.doe@xz> (Comment)"   (c)
 103         *
 104         * but we have removed the email part, so
 105         *
 106         * - remove extra spaces which could stay after email (case 'c'), and
 107         * - trim from both ends, possibly removing the () pair at the end
 108         *   (cases 'a' and 'b').
 109         */
 110        cleanup_space(&f);
 111        strbuf_trim(&f);
 112        if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
 113                strbuf_remove(&f, 0, 1);
 114                strbuf_setlen(&f, f.len - 1);
 115        }
 116
 117        get_sane_name(&mi->name, &f, &mi->email);
 118        strbuf_release(&f);
 119}
 120
 121static void handle_header(struct strbuf **out, const struct strbuf *line)
 122{
 123        if (!*out) {
 124                *out = xmalloc(sizeof(struct strbuf));
 125                strbuf_init(*out, line->len);
 126        } else
 127                strbuf_reset(*out);
 128
 129        strbuf_addbuf(*out, line);
 130}
 131
 132/* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
 133 * to have enough heuristics to grok MIME encoded patches often found
 134 * on our mailing lists.  For example, we do not even treat header lines
 135 * case insensitively.
 136 */
 137
 138static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
 139{
 140        const char *ends, *ap = strcasestr(line, name);
 141        size_t sz;
 142
 143        strbuf_setlen(attr, 0);
 144        if (!ap)
 145                return 0;
 146        ap += strlen(name);
 147        if (*ap == '"') {
 148                ap++;
 149                ends = "\"";
 150        }
 151        else
 152                ends = "; \t";
 153        sz = strcspn(ap, ends);
 154        strbuf_add(attr, ap, sz);
 155        return 1;
 156}
 157
 158static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
 159{
 160        struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
 161        strbuf_init(boundary, line->len);
 162
 163        if (slurp_attr(line->buf, "boundary=", boundary)) {
 164                strbuf_insert(boundary, 0, "--", 2);
 165                if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
 166                        error("Too many boundaries to handle");
 167                        mi->input_error = -1;
 168                        mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
 169                        return;
 170                }
 171                *(mi->content_top) = boundary;
 172                boundary = NULL;
 173        }
 174        slurp_attr(line->buf, "charset=", &mi->charset);
 175
 176        if (boundary) {
 177                strbuf_release(boundary);
 178                free(boundary);
 179        }
 180}
 181
 182static void handle_content_transfer_encoding(struct mailinfo *mi,
 183                                             const struct strbuf *line)
 184{
 185        if (strcasestr(line->buf, "base64"))
 186                mi->transfer_encoding = TE_BASE64;
 187        else if (strcasestr(line->buf, "quoted-printable"))
 188                mi->transfer_encoding = TE_QP;
 189        else
 190                mi->transfer_encoding = TE_DONTCARE;
 191}
 192
 193static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
 194{
 195        struct strbuf *content_top = *(mi->content_top);
 196
 197        return ((content_top->len <= line->len) &&
 198                !memcmp(line->buf, content_top->buf, content_top->len));
 199}
 200
 201static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
 202{
 203        size_t at = 0;
 204
 205        while (at < subject->len) {
 206                char *pos;
 207                size_t remove;
 208
 209                switch (subject->buf[at]) {
 210                case 'r': case 'R':
 211                        if (subject->len <= at + 3)
 212                                break;
 213                        if ((subject->buf[at + 1] == 'e' ||
 214                             subject->buf[at + 1] == 'E') &&
 215                            subject->buf[at + 2] == ':') {
 216                                strbuf_remove(subject, at, 3);
 217                                continue;
 218                        }
 219                        at++;
 220                        break;
 221                case ' ': case '\t': case ':':
 222                        strbuf_remove(subject, at, 1);
 223                        continue;
 224                case '[':
 225                        pos = strchr(subject->buf + at, ']');
 226                        if (!pos)
 227                                break;
 228                        remove = pos - subject->buf + at + 1;
 229                        if (!mi->keep_non_patch_brackets_in_subject ||
 230                            (7 <= remove &&
 231                             memmem(subject->buf + at, remove, "PATCH", 5)))
 232                                strbuf_remove(subject, at, remove);
 233                        else {
 234                                at += remove;
 235                                /*
 236                                 * If the input had a space after the ], keep
 237                                 * it.  We don't bother with finding the end of
 238                                 * the space, since we later normalize it
 239                                 * anyway.
 240                                 */
 241                                if (isspace(subject->buf[at]))
 242                                        at += 1;
 243                        }
 244                        continue;
 245                }
 246                break;
 247        }
 248        strbuf_trim(subject);
 249}
 250
 251#define MAX_HDR_PARSED 10
 252static const char *header[MAX_HDR_PARSED] = {
 253        "From","Subject","Date",
 254};
 255
 256static inline int cmp_header(const struct strbuf *line, const char *hdr)
 257{
 258        int len = strlen(hdr);
 259        return !strncasecmp(line->buf, hdr, len) && line->len > len &&
 260                        line->buf[len] == ':' && isspace(line->buf[len + 1]);
 261}
 262
 263static int is_format_patch_separator(const char *line, int len)
 264{
 265        static const char SAMPLE[] =
 266                "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
 267        const char *cp;
 268
 269        if (len != strlen(SAMPLE))
 270                return 0;
 271        if (!skip_prefix(line, "From ", &cp))
 272                return 0;
 273        if (strspn(cp, "0123456789abcdef") != 40)
 274                return 0;
 275        cp += 40;
 276        return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
 277}
 278
 279static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
 280{
 281        const char *in = q_seg->buf;
 282        int c;
 283        struct strbuf *out = xmalloc(sizeof(struct strbuf));
 284        strbuf_init(out, q_seg->len);
 285
 286        while ((c = *in++) != 0) {
 287                if (c == '=') {
 288                        int d = *in++;
 289                        if (d == '\n' || !d)
 290                                break; /* drop trailing newline */
 291                        strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
 292                        continue;
 293                }
 294                if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 295                        c = 0x20;
 296                strbuf_addch(out, c);
 297        }
 298        return out;
 299}
 300
 301static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
 302{
 303        /* Decode in..ep, possibly in-place to ot */
 304        int c, pos = 0, acc = 0;
 305        const char *in = b_seg->buf;
 306        struct strbuf *out = xmalloc(sizeof(struct strbuf));
 307        strbuf_init(out, b_seg->len);
 308
 309        while ((c = *in++) != 0) {
 310                if (c == '+')
 311                        c = 62;
 312                else if (c == '/')
 313                        c = 63;
 314                else if ('A' <= c && c <= 'Z')
 315                        c -= 'A';
 316                else if ('a' <= c && c <= 'z')
 317                        c -= 'a' - 26;
 318                else if ('0' <= c && c <= '9')
 319                        c -= '0' - 52;
 320                else
 321                        continue; /* garbage */
 322                switch (pos++) {
 323                case 0:
 324                        acc = (c << 2);
 325                        break;
 326                case 1:
 327                        strbuf_addch(out, (acc | (c >> 4)));
 328                        acc = (c & 15) << 4;
 329                        break;
 330                case 2:
 331                        strbuf_addch(out, (acc | (c >> 2)));
 332                        acc = (c & 3) << 6;
 333                        break;
 334                case 3:
 335                        strbuf_addch(out, (acc | c));
 336                        acc = pos = 0;
 337                        break;
 338                }
 339        }
 340        return out;
 341}
 342
 343static int convert_to_utf8(struct mailinfo *mi,
 344                           struct strbuf *line, const char *charset)
 345{
 346        char *out;
 347
 348        if (!mi->metainfo_charset || !charset || !*charset)
 349                return 0;
 350
 351        if (same_encoding(mi->metainfo_charset, charset))
 352                return 0;
 353        out = reencode_string(line->buf, mi->metainfo_charset, charset);
 354        if (!out) {
 355                mi->input_error = -1;
 356                return error("cannot convert from %s to %s",
 357                             charset, mi->metainfo_charset);
 358        }
 359        strbuf_attach(line, out, strlen(out), strlen(out));
 360        return 0;
 361}
 362
 363static void decode_header(struct mailinfo *mi, struct strbuf *it)
 364{
 365        char *in, *ep, *cp;
 366        struct strbuf outbuf = STRBUF_INIT, *dec;
 367        struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
 368        int found_error = 1; /* pessimism */
 369
 370        in = it->buf;
 371        while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
 372                int encoding;
 373                strbuf_reset(&charset_q);
 374                strbuf_reset(&piecebuf);
 375
 376                if (in != ep) {
 377                        /*
 378                         * We are about to process an encoded-word
 379                         * that begins at ep, but there is something
 380                         * before the encoded word.
 381                         */
 382                        char *scan;
 383                        for (scan = in; scan < ep; scan++)
 384                                if (!isspace(*scan))
 385                                        break;
 386
 387                        if (scan != ep || in == it->buf) {
 388                                /*
 389                                 * We should not lose that "something",
 390                                 * unless we have just processed an
 391                                 * encoded-word, and there is only LWS
 392                                 * before the one we are about to process.
 393                                 */
 394                                strbuf_add(&outbuf, in, ep - in);
 395                        }
 396                }
 397                /* E.g.
 398                 * ep : "=?iso-2022-jp?B?GyR...?= foo"
 399                 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 400                 */
 401                ep += 2;
 402
 403                if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
 404                        goto release_return;
 405
 406                if (cp + 3 - it->buf > it->len)
 407                        goto release_return;
 408                strbuf_add(&charset_q, ep, cp - ep);
 409
 410                encoding = cp[1];
 411                if (!encoding || cp[2] != '?')
 412                        goto release_return;
 413                ep = strstr(cp + 3, "?=");
 414                if (!ep)
 415                        goto release_return;
 416                strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
 417                switch (tolower(encoding)) {
 418                default:
 419                        goto release_return;
 420                case 'b':
 421                        dec = decode_b_segment(&piecebuf);
 422                        break;
 423                case 'q':
 424                        dec = decode_q_segment(&piecebuf, 1);
 425                        break;
 426                }
 427                if (convert_to_utf8(mi, dec, charset_q.buf))
 428                        goto release_return;
 429
 430                strbuf_addbuf(&outbuf, dec);
 431                strbuf_release(dec);
 432                free(dec);
 433                in = ep + 2;
 434        }
 435        strbuf_addstr(&outbuf, in);
 436        strbuf_reset(it);
 437        strbuf_addbuf(it, &outbuf);
 438        found_error = 0;
 439release_return:
 440        strbuf_release(&outbuf);
 441        strbuf_release(&charset_q);
 442        strbuf_release(&piecebuf);
 443
 444        if (found_error)
 445                mi->input_error = -1;
 446}
 447
 448static int check_header(struct mailinfo *mi,
 449                        const struct strbuf *line,
 450                        struct strbuf *hdr_data[], int overwrite)
 451{
 452        int i, ret = 0, len;
 453        struct strbuf sb = STRBUF_INIT;
 454
 455        /* search for the interesting parts */
 456        for (i = 0; header[i]; i++) {
 457                int len = strlen(header[i]);
 458                if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
 459                        /* Unwrap inline B and Q encoding, and optionally
 460                         * normalize the meta information to utf8.
 461                         */
 462                        strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
 463                        decode_header(mi, &sb);
 464                        handle_header(&hdr_data[i], &sb);
 465                        ret = 1;
 466                        goto check_header_out;
 467                }
 468        }
 469
 470        /* Content stuff */
 471        if (cmp_header(line, "Content-Type")) {
 472                len = strlen("Content-Type: ");
 473                strbuf_add(&sb, line->buf + len, line->len - len);
 474                decode_header(mi, &sb);
 475                strbuf_insert(&sb, 0, "Content-Type: ", len);
 476                handle_content_type(mi, &sb);
 477                ret = 1;
 478                goto check_header_out;
 479        }
 480        if (cmp_header(line, "Content-Transfer-Encoding")) {
 481                len = strlen("Content-Transfer-Encoding: ");
 482                strbuf_add(&sb, line->buf + len, line->len - len);
 483                decode_header(mi, &sb);
 484                handle_content_transfer_encoding(mi, &sb);
 485                ret = 1;
 486                goto check_header_out;
 487        }
 488        if (cmp_header(line, "Message-Id")) {
 489                len = strlen("Message-Id: ");
 490                strbuf_add(&sb, line->buf + len, line->len - len);
 491                decode_header(mi, &sb);
 492                if (mi->add_message_id)
 493                        mi->message_id = strbuf_detach(&sb, NULL);
 494                ret = 1;
 495                goto check_header_out;
 496        }
 497
 498        /* for inbody stuff */
 499        if (starts_with(line->buf, ">From") && isspace(line->buf[5])) {
 500                ret = is_format_patch_separator(line->buf + 1, line->len - 1);
 501                goto check_header_out;
 502        }
 503        if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
 504                for (i = 0; header[i]; i++) {
 505                        if (!strcmp("Subject", header[i])) {
 506                                handle_header(&hdr_data[i], line);
 507                                ret = 1;
 508                                goto check_header_out;
 509                        }
 510                }
 511        }
 512
 513check_header_out:
 514        strbuf_release(&sb);
 515        return ret;
 516}
 517
 518static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
 519{
 520        struct strbuf *ret;
 521
 522        switch (mi->transfer_encoding) {
 523        case TE_QP:
 524                ret = decode_q_segment(line, 0);
 525                break;
 526        case TE_BASE64:
 527                ret = decode_b_segment(line);
 528                break;
 529        case TE_DONTCARE:
 530        default:
 531                return;
 532        }
 533        strbuf_reset(line);
 534        strbuf_addbuf(line, ret);
 535        strbuf_release(ret);
 536        free(ret);
 537}
 538
 539static inline int patchbreak(const struct strbuf *line)
 540{
 541        size_t i;
 542
 543        /* Beginning of a "diff -" header? */
 544        if (starts_with(line->buf, "diff -"))
 545                return 1;
 546
 547        /* CVS "Index: " line? */
 548        if (starts_with(line->buf, "Index: "))
 549                return 1;
 550
 551        /*
 552         * "--- <filename>" starts patches without headers
 553         * "---<sp>*" is a manual separator
 554         */
 555        if (line->len < 4)
 556                return 0;
 557
 558        if (starts_with(line->buf, "---")) {
 559                /* space followed by a filename? */
 560                if (line->buf[3] == ' ' && !isspace(line->buf[4]))
 561                        return 1;
 562                /* Just whitespace? */
 563                for (i = 3; i < line->len; i++) {
 564                        unsigned char c = line->buf[i];
 565                        if (c == '\n')
 566                                return 1;
 567                        if (!isspace(c))
 568                                break;
 569                }
 570                return 0;
 571        }
 572        return 0;
 573}
 574
 575static int is_scissors_line(const struct strbuf *line)
 576{
 577        size_t i, len = line->len;
 578        int scissors = 0, gap = 0;
 579        int first_nonblank = -1;
 580        int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
 581        const char *buf = line->buf;
 582
 583        for (i = 0; i < len; i++) {
 584                if (isspace(buf[i])) {
 585                        if (in_perforation) {
 586                                perforation++;
 587                                gap++;
 588                        }
 589                        continue;
 590                }
 591                last_nonblank = i;
 592                if (first_nonblank < 0)
 593                        first_nonblank = i;
 594                if (buf[i] == '-') {
 595                        in_perforation = 1;
 596                        perforation++;
 597                        continue;
 598                }
 599                if (i + 1 < len &&
 600                    (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
 601                     !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
 602                        in_perforation = 1;
 603                        perforation += 2;
 604                        scissors += 2;
 605                        i++;
 606                        continue;
 607                }
 608                in_perforation = 0;
 609        }
 610
 611        /*
 612         * The mark must be at least 8 bytes long (e.g. "-- >8 --").
 613         * Even though there can be arbitrary cruft on the same line
 614         * (e.g. "cut here"), in order to avoid misidentification, the
 615         * perforation must occupy more than a third of the visible
 616         * width of the line, and dashes and scissors must occupy more
 617         * than half of the perforation.
 618         */
 619
 620        visible = last_nonblank - first_nonblank + 1;
 621        return (scissors && 8 <= visible &&
 622                visible < perforation * 3 &&
 623                gap * 2 < perforation);
 624}
 625
 626static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
 627{
 628        assert(!mi->filter_stage);
 629
 630        if (mi->header_stage) {
 631                if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
 632                        return 0;
 633        }
 634
 635        if (mi->use_inbody_headers && mi->header_stage) {
 636                mi->header_stage = check_header(mi, line, mi->s_hdr_data, 0);
 637                if (mi->header_stage)
 638                        return 0;
 639        } else
 640                /* Only trim the first (blank) line of the commit message
 641                 * when ignoring in-body headers.
 642                 */
 643                mi->header_stage = 0;
 644
 645        /* normalize the log message to UTF-8. */
 646        if (convert_to_utf8(mi, line, mi->charset.buf))
 647                return 0; /* mi->input_error already set */
 648
 649        if (mi->use_scissors && is_scissors_line(line)) {
 650                int i;
 651
 652                strbuf_setlen(&mi->log_message, 0);
 653                mi->header_stage = 1;
 654
 655                /*
 656                 * We may have already read "secondary headers"; purge
 657                 * them to give ourselves a clean restart.
 658                 */
 659                for (i = 0; header[i]; i++) {
 660                        if (mi->s_hdr_data[i])
 661                                strbuf_release(mi->s_hdr_data[i]);
 662                        mi->s_hdr_data[i] = NULL;
 663                }
 664                return 0;
 665        }
 666
 667        if (patchbreak(line)) {
 668                if (mi->message_id)
 669                        strbuf_addf(&mi->log_message,
 670                                    "Message-Id: %s\n", mi->message_id);
 671                return 1;
 672        }
 673
 674        strbuf_addbuf(&mi->log_message, line);
 675        return 0;
 676}
 677
 678static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
 679{
 680        fwrite(line->buf, 1, line->len, mi->patchfile);
 681        mi->patch_lines++;
 682}
 683
 684static void handle_filter(struct mailinfo *mi, struct strbuf *line)
 685{
 686        switch (mi->filter_stage) {
 687        case 0:
 688                if (!handle_commit_msg(mi, line))
 689                        break;
 690                mi->filter_stage++;
 691        case 1:
 692                handle_patch(mi, line);
 693                break;
 694        }
 695}
 696
 697static int is_rfc2822_header(const struct strbuf *line)
 698{
 699        /*
 700         * The section that defines the loosest possible
 701         * field name is "3.6.8 Optional fields".
 702         *
 703         * optional-field = field-name ":" unstructured CRLF
 704         * field-name = 1*ftext
 705         * ftext = %d33-57 / %59-126
 706         */
 707        int ch;
 708        char *cp = line->buf;
 709
 710        /* Count mbox From headers as headers */
 711        if (starts_with(cp, "From ") || starts_with(cp, ">From "))
 712                return 1;
 713
 714        while ((ch = *cp++)) {
 715                if (ch == ':')
 716                        return 1;
 717                if ((33 <= ch && ch <= 57) ||
 718                    (59 <= ch && ch <= 126))
 719                        continue;
 720                break;
 721        }
 722        return 0;
 723}
 724
 725static int read_one_header_line(struct strbuf *line, FILE *in)
 726{
 727        struct strbuf continuation = STRBUF_INIT;
 728
 729        /* Get the first part of the line. */
 730        if (strbuf_getline_lf(line, in))
 731                return 0;
 732
 733        /*
 734         * Is it an empty line or not a valid rfc2822 header?
 735         * If so, stop here, and return false ("not a header")
 736         */
 737        strbuf_rtrim(line);
 738        if (!line->len || !is_rfc2822_header(line)) {
 739                /* Re-add the newline */
 740                strbuf_addch(line, '\n');
 741                return 0;
 742        }
 743
 744        /*
 745         * Now we need to eat all the continuation lines..
 746         * Yuck, 2822 header "folding"
 747         */
 748        for (;;) {
 749                int peek;
 750
 751                peek = fgetc(in); ungetc(peek, in);
 752                if (peek != ' ' && peek != '\t')
 753                        break;
 754                if (strbuf_getline_lf(&continuation, in))
 755                        break;
 756                continuation.buf[0] = ' ';
 757                strbuf_rtrim(&continuation);
 758                strbuf_addbuf(line, &continuation);
 759        }
 760        strbuf_release(&continuation);
 761
 762        return 1;
 763}
 764
 765static int find_boundary(struct mailinfo *mi, struct strbuf *line)
 766{
 767        while (!strbuf_getline_lf(line, mi->input)) {
 768                if (*(mi->content_top) && is_multipart_boundary(mi, line))
 769                        return 1;
 770        }
 771        return 0;
 772}
 773
 774static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
 775{
 776        struct strbuf newline = STRBUF_INIT;
 777
 778        strbuf_addch(&newline, '\n');
 779again:
 780        if (line->len >= (*(mi->content_top))->len + 2 &&
 781            !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
 782                /* we hit an end boundary */
 783                /* pop the current boundary off the stack */
 784                strbuf_release(*(mi->content_top));
 785                free(*(mi->content_top));
 786                *(mi->content_top) = NULL;
 787
 788                /* technically won't happen as is_multipart_boundary()
 789                   will fail first.  But just in case..
 790                 */
 791                if (--mi->content_top < mi->content) {
 792                        error("Detected mismatched boundaries, can't recover");
 793                        mi->input_error = -1;
 794                        mi->content_top = mi->content;
 795                        return 0;
 796                }
 797                handle_filter(mi, &newline);
 798                strbuf_release(&newline);
 799                if (mi->input_error)
 800                        return 0;
 801
 802                /* skip to the next boundary */
 803                if (!find_boundary(mi, line))
 804                        return 0;
 805                goto again;
 806        }
 807
 808        /* set some defaults */
 809        mi->transfer_encoding = TE_DONTCARE;
 810        strbuf_reset(&mi->charset);
 811
 812        /* slurp in this section's info */
 813        while (read_one_header_line(line, mi->input))
 814                check_header(mi, line, mi->p_hdr_data, 0);
 815
 816        strbuf_release(&newline);
 817        /* replenish line */
 818        if (strbuf_getline_lf(line, mi->input))
 819                return 0;
 820        strbuf_addch(line, '\n');
 821        return 1;
 822}
 823
 824static void handle_body(struct mailinfo *mi, struct strbuf *line)
 825{
 826        struct strbuf prev = STRBUF_INIT;
 827
 828        /* Skip up to the first boundary */
 829        if (*(mi->content_top)) {
 830                if (!find_boundary(mi, line))
 831                        goto handle_body_out;
 832        }
 833
 834        do {
 835                /* process any boundary lines */
 836                if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
 837                        /* flush any leftover */
 838                        if (prev.len) {
 839                                handle_filter(mi, &prev);
 840                                strbuf_reset(&prev);
 841                        }
 842                        if (!handle_boundary(mi, line))
 843                                goto handle_body_out;
 844                }
 845
 846                /* Unwrap transfer encoding */
 847                decode_transfer_encoding(mi, line);
 848
 849                switch (mi->transfer_encoding) {
 850                case TE_BASE64:
 851                case TE_QP:
 852                {
 853                        struct strbuf **lines, **it, *sb;
 854
 855                        /* Prepend any previous partial lines */
 856                        strbuf_insert(line, 0, prev.buf, prev.len);
 857                        strbuf_reset(&prev);
 858
 859                        /*
 860                         * This is a decoded line that may contain
 861                         * multiple new lines.  Pass only one chunk
 862                         * at a time to handle_filter()
 863                         */
 864                        lines = strbuf_split(line, '\n');
 865                        for (it = lines; (sb = *it); it++) {
 866                                if (*(it + 1) == NULL) /* The last line */
 867                                        if (sb->buf[sb->len - 1] != '\n') {
 868                                                /* Partial line, save it for later. */
 869                                                strbuf_addbuf(&prev, sb);
 870                                                break;
 871                                        }
 872                                handle_filter(mi, sb);
 873                        }
 874                        /*
 875                         * The partial chunk is saved in "prev" and will be
 876                         * appended by the next iteration of read_line_with_nul().
 877                         */
 878                        strbuf_list_free(lines);
 879                        break;
 880                }
 881                default:
 882                        handle_filter(mi, line);
 883                }
 884
 885                if (mi->input_error)
 886                        break;
 887        } while (!strbuf_getwholeline(line, mi->input, '\n'));
 888
 889handle_body_out:
 890        strbuf_release(&prev);
 891}
 892
 893static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
 894{
 895        const char *sp = data->buf;
 896        while (1) {
 897                char *ep = strchr(sp, '\n');
 898                int len;
 899                if (!ep)
 900                        len = strlen(sp);
 901                else
 902                        len = ep - sp;
 903                fprintf(fout, "%s: %.*s\n", hdr, len, sp);
 904                if (!ep)
 905                        break;
 906                sp = ep + 1;
 907        }
 908}
 909
 910static void handle_info(struct mailinfo *mi)
 911{
 912        struct strbuf *hdr;
 913        int i;
 914
 915        for (i = 0; header[i]; i++) {
 916                /* only print inbody headers if we output a patch file */
 917                if (mi->patch_lines && mi->s_hdr_data[i])
 918                        hdr = mi->s_hdr_data[i];
 919                else if (mi->p_hdr_data[i])
 920                        hdr = mi->p_hdr_data[i];
 921                else
 922                        continue;
 923
 924                if (!strcmp(header[i], "Subject")) {
 925                        if (!mi->keep_subject) {
 926                                cleanup_subject(mi, hdr);
 927                                cleanup_space(hdr);
 928                        }
 929                        output_header_lines(mi->output, "Subject", hdr);
 930                } else if (!strcmp(header[i], "From")) {
 931                        cleanup_space(hdr);
 932                        handle_from(mi, hdr);
 933                        fprintf(mi->output, "Author: %s\n", mi->name.buf);
 934                        fprintf(mi->output, "Email: %s\n", mi->email.buf);
 935                } else {
 936                        cleanup_space(hdr);
 937                        fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
 938                }
 939        }
 940        fprintf(mi->output, "\n");
 941}
 942
 943int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
 944{
 945        FILE *cmitmsg;
 946        int peek;
 947        struct strbuf line = STRBUF_INIT;
 948
 949        cmitmsg = fopen(msg, "w");
 950        if (!cmitmsg) {
 951                perror(msg);
 952                return -1;
 953        }
 954        mi->patchfile = fopen(patch, "w");
 955        if (!mi->patchfile) {
 956                perror(patch);
 957                fclose(cmitmsg);
 958                return -1;
 959        }
 960
 961        mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
 962        mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
 963
 964        do {
 965                peek = fgetc(mi->input);
 966        } while (isspace(peek));
 967        ungetc(peek, mi->input);
 968
 969        /* process the email header */
 970        while (read_one_header_line(&line, mi->input))
 971                check_header(mi, &line, mi->p_hdr_data, 1);
 972
 973        handle_body(mi, &line);
 974        fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
 975        fclose(cmitmsg);
 976        fclose(mi->patchfile);
 977
 978        handle_info(mi);
 979        strbuf_release(&line);
 980        return mi->input_error;
 981}
 982
 983static int git_mailinfo_config(const char *var, const char *value, void *mi_)
 984{
 985        struct mailinfo *mi = mi_;
 986
 987        if (!starts_with(var, "mailinfo."))
 988                return git_default_config(var, value, NULL);
 989        if (!strcmp(var, "mailinfo.scissors")) {
 990                mi->use_scissors = git_config_bool(var, value);
 991                return 0;
 992        }
 993        /* perhaps others here */
 994        return 0;
 995}
 996
 997void setup_mailinfo(struct mailinfo *mi)
 998{
 999        memset(mi, 0, sizeof(*mi));
1000        strbuf_init(&mi->name, 0);
1001        strbuf_init(&mi->email, 0);
1002        strbuf_init(&mi->charset, 0);
1003        strbuf_init(&mi->log_message, 0);
1004        mi->header_stage = 1;
1005        mi->use_inbody_headers = 1;
1006        mi->content_top = mi->content;
1007        git_config(git_mailinfo_config, mi);
1008}
1009
1010void clear_mailinfo(struct mailinfo *mi)
1011{
1012        int i;
1013
1014        strbuf_release(&mi->name);
1015        strbuf_release(&mi->email);
1016        strbuf_release(&mi->charset);
1017        free(mi->message_id);
1018
1019        for (i = 0; mi->p_hdr_data[i]; i++)
1020                strbuf_release(mi->p_hdr_data[i]);
1021        free(mi->p_hdr_data);
1022        for (i = 0; mi->s_hdr_data[i]; i++)
1023                strbuf_release(mi->s_hdr_data[i]);
1024        free(mi->s_hdr_data);
1025
1026        while (mi->content < mi->content_top) {
1027                free(*(mi->content_top));
1028                mi->content_top--;
1029        }
1030
1031        strbuf_release(&mi->log_message);
1032}