97e5cb8d70c81017ce3c73fb3a70cedbe07053d7
   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                        fprintf(stderr, "Too many boundaries to handle\n");
 167                        exit(1);
 168                }
 169                *(mi->content_top) = boundary;
 170                boundary = NULL;
 171        }
 172        slurp_attr(line->buf, "charset=", &mi->charset);
 173
 174        if (boundary) {
 175                strbuf_release(boundary);
 176                free(boundary);
 177        }
 178}
 179
 180static void handle_message_id(struct mailinfo *mi, const struct strbuf *line)
 181{
 182        if (mi->add_message_id)
 183                mi->message_id = strdup(line->buf);
 184}
 185
 186static void handle_content_transfer_encoding(struct mailinfo *mi,
 187                                             const struct strbuf *line)
 188{
 189        if (strcasestr(line->buf, "base64"))
 190                mi->transfer_encoding = TE_BASE64;
 191        else if (strcasestr(line->buf, "quoted-printable"))
 192                mi->transfer_encoding = TE_QP;
 193        else
 194                mi->transfer_encoding = TE_DONTCARE;
 195}
 196
 197static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
 198{
 199        struct strbuf *content_top = *(mi->content_top);
 200
 201        return ((content_top->len <= line->len) &&
 202                !memcmp(line->buf, content_top->buf, content_top->len));
 203}
 204
 205static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
 206{
 207        size_t at = 0;
 208
 209        while (at < subject->len) {
 210                char *pos;
 211                size_t remove;
 212
 213                switch (subject->buf[at]) {
 214                case 'r': case 'R':
 215                        if (subject->len <= at + 3)
 216                                break;
 217                        if ((subject->buf[at + 1] == 'e' ||
 218                             subject->buf[at + 1] == 'E') &&
 219                            subject->buf[at + 2] == ':') {
 220                                strbuf_remove(subject, at, 3);
 221                                continue;
 222                        }
 223                        at++;
 224                        break;
 225                case ' ': case '\t': case ':':
 226                        strbuf_remove(subject, at, 1);
 227                        continue;
 228                case '[':
 229                        pos = strchr(subject->buf + at, ']');
 230                        if (!pos)
 231                                break;
 232                        remove = pos - subject->buf + at + 1;
 233                        if (!mi->keep_non_patch_brackets_in_subject ||
 234                            (7 <= remove &&
 235                             memmem(subject->buf + at, remove, "PATCH", 5)))
 236                                strbuf_remove(subject, at, remove);
 237                        else {
 238                                at += remove;
 239                                /*
 240                                 * If the input had a space after the ], keep
 241                                 * it.  We don't bother with finding the end of
 242                                 * the space, since we later normalize it
 243                                 * anyway.
 244                                 */
 245                                if (isspace(subject->buf[at]))
 246                                        at += 1;
 247                        }
 248                        continue;
 249                }
 250                break;
 251        }
 252        strbuf_trim(subject);
 253}
 254
 255#define MAX_HDR_PARSED 10
 256static const char *header[MAX_HDR_PARSED] = {
 257        "From","Subject","Date",
 258};
 259
 260static inline int cmp_header(const struct strbuf *line, const char *hdr)
 261{
 262        int len = strlen(hdr);
 263        return !strncasecmp(line->buf, hdr, len) && line->len > len &&
 264                        line->buf[len] == ':' && isspace(line->buf[len + 1]);
 265}
 266
 267static int is_format_patch_separator(const char *line, int len)
 268{
 269        static const char SAMPLE[] =
 270                "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
 271        const char *cp;
 272
 273        if (len != strlen(SAMPLE))
 274                return 0;
 275        if (!skip_prefix(line, "From ", &cp))
 276                return 0;
 277        if (strspn(cp, "0123456789abcdef") != 40)
 278                return 0;
 279        cp += 40;
 280        return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
 281}
 282
 283static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
 284{
 285        const char *in = q_seg->buf;
 286        int c;
 287        struct strbuf *out = xmalloc(sizeof(struct strbuf));
 288        strbuf_init(out, q_seg->len);
 289
 290        while ((c = *in++) != 0) {
 291                if (c == '=') {
 292                        int d = *in++;
 293                        if (d == '\n' || !d)
 294                                break; /* drop trailing newline */
 295                        strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
 296                        continue;
 297                }
 298                if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 299                        c = 0x20;
 300                strbuf_addch(out, c);
 301        }
 302        return out;
 303}
 304
 305static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
 306{
 307        /* Decode in..ep, possibly in-place to ot */
 308        int c, pos = 0, acc = 0;
 309        const char *in = b_seg->buf;
 310        struct strbuf *out = xmalloc(sizeof(struct strbuf));
 311        strbuf_init(out, b_seg->len);
 312
 313        while ((c = *in++) != 0) {
 314                if (c == '+')
 315                        c = 62;
 316                else if (c == '/')
 317                        c = 63;
 318                else if ('A' <= c && c <= 'Z')
 319                        c -= 'A';
 320                else if ('a' <= c && c <= 'z')
 321                        c -= 'a' - 26;
 322                else if ('0' <= c && c <= '9')
 323                        c -= '0' - 52;
 324                else
 325                        continue; /* garbage */
 326                switch (pos++) {
 327                case 0:
 328                        acc = (c << 2);
 329                        break;
 330                case 1:
 331                        strbuf_addch(out, (acc | (c >> 4)));
 332                        acc = (c & 15) << 4;
 333                        break;
 334                case 2:
 335                        strbuf_addch(out, (acc | (c >> 2)));
 336                        acc = (c & 3) << 6;
 337                        break;
 338                case 3:
 339                        strbuf_addch(out, (acc | c));
 340                        acc = pos = 0;
 341                        break;
 342                }
 343        }
 344        return out;
 345}
 346
 347static int convert_to_utf8(struct mailinfo *mi,
 348                           struct strbuf *line, const char *charset)
 349{
 350        char *out;
 351
 352        if (!mi->metainfo_charset || !charset || !*charset)
 353                return 0;
 354
 355        if (same_encoding(mi->metainfo_charset, charset))
 356                return 0;
 357        out = reencode_string(line->buf, mi->metainfo_charset, charset);
 358        if (!out)
 359                return error("cannot convert from %s to %s",
 360                             charset, mi->metainfo_charset);
 361        strbuf_attach(line, out, strlen(out), strlen(out));
 362        return 0;
 363}
 364
 365static void decode_header(struct mailinfo *mi, struct strbuf *it)
 366{
 367        char *in, *ep, *cp;
 368        struct strbuf outbuf = STRBUF_INIT, *dec;
 369        struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
 370
 371        in = it->buf;
 372        while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
 373                int encoding;
 374                strbuf_reset(&charset_q);
 375                strbuf_reset(&piecebuf);
 376
 377                if (in != ep) {
 378                        /*
 379                         * We are about to process an encoded-word
 380                         * that begins at ep, but there is something
 381                         * before the encoded word.
 382                         */
 383                        char *scan;
 384                        for (scan = in; scan < ep; scan++)
 385                                if (!isspace(*scan))
 386                                        break;
 387
 388                        if (scan != ep || in == it->buf) {
 389                                /*
 390                                 * We should not lose that "something",
 391                                 * unless we have just processed an
 392                                 * encoded-word, and there is only LWS
 393                                 * before the one we are about to process.
 394                                 */
 395                                strbuf_add(&outbuf, in, ep - in);
 396                        }
 397                }
 398                /* E.g.
 399                 * ep : "=?iso-2022-jp?B?GyR...?= foo"
 400                 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 401                 */
 402                ep += 2;
 403
 404                if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
 405                        goto release_return;
 406
 407                if (cp + 3 - it->buf > it->len)
 408                        goto release_return;
 409                strbuf_add(&charset_q, ep, cp - ep);
 410
 411                encoding = cp[1];
 412                if (!encoding || cp[2] != '?')
 413                        goto release_return;
 414                ep = strstr(cp + 3, "?=");
 415                if (!ep)
 416                        goto release_return;
 417                strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
 418                switch (tolower(encoding)) {
 419                default:
 420                        goto release_return;
 421                case 'b':
 422                        dec = decode_b_segment(&piecebuf);
 423                        break;
 424                case 'q':
 425                        dec = decode_q_segment(&piecebuf, 1);
 426                        break;
 427                }
 428                if (convert_to_utf8(mi, dec, charset_q.buf))
 429                        goto release_return;
 430
 431                strbuf_addbuf(&outbuf, dec);
 432                strbuf_release(dec);
 433                free(dec);
 434                in = ep + 2;
 435        }
 436        strbuf_addstr(&outbuf, in);
 437        strbuf_reset(it);
 438        strbuf_addbuf(it, &outbuf);
 439release_return:
 440        strbuf_release(&outbuf);
 441        strbuf_release(&charset_q);
 442        strbuf_release(&piecebuf);
 443}
 444
 445static int check_header(struct mailinfo *mi,
 446                        const struct strbuf *line,
 447                        struct strbuf *hdr_data[], int overwrite)
 448{
 449        int i, ret = 0, len;
 450        struct strbuf sb = STRBUF_INIT;
 451
 452        /* search for the interesting parts */
 453        for (i = 0; header[i]; i++) {
 454                int len = strlen(header[i]);
 455                if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
 456                        /* Unwrap inline B and Q encoding, and optionally
 457                         * normalize the meta information to utf8.
 458                         */
 459                        strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
 460                        decode_header(mi, &sb);
 461                        handle_header(&hdr_data[i], &sb);
 462                        ret = 1;
 463                        goto check_header_out;
 464                }
 465        }
 466
 467        /* Content stuff */
 468        if (cmp_header(line, "Content-Type")) {
 469                len = strlen("Content-Type: ");
 470                strbuf_add(&sb, line->buf + len, line->len - len);
 471                decode_header(mi, &sb);
 472                strbuf_insert(&sb, 0, "Content-Type: ", len);
 473                handle_content_type(mi, &sb);
 474                ret = 1;
 475                goto check_header_out;
 476        }
 477        if (cmp_header(line, "Content-Transfer-Encoding")) {
 478                len = strlen("Content-Transfer-Encoding: ");
 479                strbuf_add(&sb, line->buf + len, line->len - len);
 480                decode_header(mi, &sb);
 481                handle_content_transfer_encoding(mi, &sb);
 482                ret = 1;
 483                goto check_header_out;
 484        }
 485        if (cmp_header(line, "Message-Id")) {
 486                len = strlen("Message-Id: ");
 487                strbuf_add(&sb, line->buf + len, line->len - len);
 488                decode_header(mi, &sb);
 489                handle_message_id(mi, &sb);
 490                ret = 1;
 491                goto check_header_out;
 492        }
 493
 494        /* for inbody stuff */
 495        if (starts_with(line->buf, ">From") && isspace(line->buf[5])) {
 496                ret = is_format_patch_separator(line->buf + 1, line->len - 1);
 497                goto check_header_out;
 498        }
 499        if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
 500                for (i = 0; header[i]; i++) {
 501                        if (!strcmp("Subject", header[i])) {
 502                                handle_header(&hdr_data[i], line);
 503                                ret = 1;
 504                                goto check_header_out;
 505                        }
 506                }
 507        }
 508
 509check_header_out:
 510        strbuf_release(&sb);
 511        return ret;
 512}
 513
 514static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
 515{
 516        struct strbuf *ret;
 517
 518        switch (mi->transfer_encoding) {
 519        case TE_QP:
 520                ret = decode_q_segment(line, 0);
 521                break;
 522        case TE_BASE64:
 523                ret = decode_b_segment(line);
 524                break;
 525        case TE_DONTCARE:
 526        default:
 527                return;
 528        }
 529        strbuf_reset(line);
 530        strbuf_addbuf(line, ret);
 531        strbuf_release(ret);
 532        free(ret);
 533}
 534
 535static inline int patchbreak(const struct strbuf *line)
 536{
 537        size_t i;
 538
 539        /* Beginning of a "diff -" header? */
 540        if (starts_with(line->buf, "diff -"))
 541                return 1;
 542
 543        /* CVS "Index: " line? */
 544        if (starts_with(line->buf, "Index: "))
 545                return 1;
 546
 547        /*
 548         * "--- <filename>" starts patches without headers
 549         * "---<sp>*" is a manual separator
 550         */
 551        if (line->len < 4)
 552                return 0;
 553
 554        if (starts_with(line->buf, "---")) {
 555                /* space followed by a filename? */
 556                if (line->buf[3] == ' ' && !isspace(line->buf[4]))
 557                        return 1;
 558                /* Just whitespace? */
 559                for (i = 3; i < line->len; i++) {
 560                        unsigned char c = line->buf[i];
 561                        if (c == '\n')
 562                                return 1;
 563                        if (!isspace(c))
 564                                break;
 565                }
 566                return 0;
 567        }
 568        return 0;
 569}
 570
 571static int is_scissors_line(const struct strbuf *line)
 572{
 573        size_t i, len = line->len;
 574        int scissors = 0, gap = 0;
 575        int first_nonblank = -1;
 576        int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
 577        const char *buf = line->buf;
 578
 579        for (i = 0; i < len; i++) {
 580                if (isspace(buf[i])) {
 581                        if (in_perforation) {
 582                                perforation++;
 583                                gap++;
 584                        }
 585                        continue;
 586                }
 587                last_nonblank = i;
 588                if (first_nonblank < 0)
 589                        first_nonblank = i;
 590                if (buf[i] == '-') {
 591                        in_perforation = 1;
 592                        perforation++;
 593                        continue;
 594                }
 595                if (i + 1 < len &&
 596                    (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
 597                     !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
 598                        in_perforation = 1;
 599                        perforation += 2;
 600                        scissors += 2;
 601                        i++;
 602                        continue;
 603                }
 604                in_perforation = 0;
 605        }
 606
 607        /*
 608         * The mark must be at least 8 bytes long (e.g. "-- >8 --").
 609         * Even though there can be arbitrary cruft on the same line
 610         * (e.g. "cut here"), in order to avoid misidentification, the
 611         * perforation must occupy more than a third of the visible
 612         * width of the line, and dashes and scissors must occupy more
 613         * than half of the perforation.
 614         */
 615
 616        visible = last_nonblank - first_nonblank + 1;
 617        return (scissors && 8 <= visible &&
 618                visible < perforation * 3 &&
 619                gap * 2 < perforation);
 620}
 621
 622static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
 623{
 624        assert(!mi->filter_stage);
 625
 626        if (mi->header_stage) {
 627                if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
 628                        return 0;
 629        }
 630
 631        if (mi->use_inbody_headers && mi->header_stage) {
 632                mi->header_stage = check_header(mi, line, mi->s_hdr_data, 0);
 633                if (mi->header_stage)
 634                        return 0;
 635        } else
 636                /* Only trim the first (blank) line of the commit message
 637                 * when ignoring in-body headers.
 638                 */
 639                mi->header_stage = 0;
 640
 641        /* normalize the log message to UTF-8. */
 642        if (convert_to_utf8(mi, line, mi->charset.buf))
 643                exit(128);
 644
 645        if (mi->use_scissors && is_scissors_line(line)) {
 646                int i;
 647
 648                strbuf_setlen(&mi->log_message, 0);
 649                mi->header_stage = 1;
 650
 651                /*
 652                 * We may have already read "secondary headers"; purge
 653                 * them to give ourselves a clean restart.
 654                 */
 655                for (i = 0; header[i]; i++) {
 656                        if (mi->s_hdr_data[i])
 657                                strbuf_release(mi->s_hdr_data[i]);
 658                        mi->s_hdr_data[i] = NULL;
 659                }
 660                return 0;
 661        }
 662
 663        if (patchbreak(line)) {
 664                if (mi->message_id)
 665                        strbuf_addf(&mi->log_message,
 666                                    "Message-Id: %s\n", mi->message_id);
 667                return 1;
 668        }
 669
 670        strbuf_addbuf(&mi->log_message, line);
 671        return 0;
 672}
 673
 674static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
 675{
 676        fwrite(line->buf, 1, line->len, mi->patchfile);
 677        mi->patch_lines++;
 678}
 679
 680static void handle_filter(struct mailinfo *mi, struct strbuf *line)
 681{
 682        switch (mi->filter_stage) {
 683        case 0:
 684                if (!handle_commit_msg(mi, line))
 685                        break;
 686                mi->filter_stage++;
 687        case 1:
 688                handle_patch(mi, line);
 689                break;
 690        }
 691}
 692
 693static int is_rfc2822_header(const struct strbuf *line)
 694{
 695        /*
 696         * The section that defines the loosest possible
 697         * field name is "3.6.8 Optional fields".
 698         *
 699         * optional-field = field-name ":" unstructured CRLF
 700         * field-name = 1*ftext
 701         * ftext = %d33-57 / %59-126
 702         */
 703        int ch;
 704        char *cp = line->buf;
 705
 706        /* Count mbox From headers as headers */
 707        if (starts_with(cp, "From ") || starts_with(cp, ">From "))
 708                return 1;
 709
 710        while ((ch = *cp++)) {
 711                if (ch == ':')
 712                        return 1;
 713                if ((33 <= ch && ch <= 57) ||
 714                    (59 <= ch && ch <= 126))
 715                        continue;
 716                break;
 717        }
 718        return 0;
 719}
 720
 721static int read_one_header_line(struct strbuf *line, FILE *in)
 722{
 723        struct strbuf continuation = STRBUF_INIT;
 724
 725        /* Get the first part of the line. */
 726        if (strbuf_getline(line, in, '\n'))
 727                return 0;
 728
 729        /*
 730         * Is it an empty line or not a valid rfc2822 header?
 731         * If so, stop here, and return false ("not a header")
 732         */
 733        strbuf_rtrim(line);
 734        if (!line->len || !is_rfc2822_header(line)) {
 735                /* Re-add the newline */
 736                strbuf_addch(line, '\n');
 737                return 0;
 738        }
 739
 740        /*
 741         * Now we need to eat all the continuation lines..
 742         * Yuck, 2822 header "folding"
 743         */
 744        for (;;) {
 745                int peek;
 746
 747                peek = fgetc(in); ungetc(peek, in);
 748                if (peek != ' ' && peek != '\t')
 749                        break;
 750                if (strbuf_getline(&continuation, in, '\n'))
 751                        break;
 752                continuation.buf[0] = ' ';
 753                strbuf_rtrim(&continuation);
 754                strbuf_addbuf(line, &continuation);
 755        }
 756        strbuf_release(&continuation);
 757
 758        return 1;
 759}
 760
 761static int find_boundary(struct mailinfo *mi, struct strbuf *line)
 762{
 763        while (!strbuf_getline(line, mi->input, '\n')) {
 764                if (*(mi->content_top) && is_multipart_boundary(mi, line))
 765                        return 1;
 766        }
 767        return 0;
 768}
 769
 770static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
 771{
 772        struct strbuf newline = STRBUF_INIT;
 773
 774        strbuf_addch(&newline, '\n');
 775again:
 776        if (line->len >= (*(mi->content_top))->len + 2 &&
 777            !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
 778                /* we hit an end boundary */
 779                /* pop the current boundary off the stack */
 780                strbuf_release(*(mi->content_top));
 781                free(*(mi->content_top));
 782                *(mi->content_top) = NULL;
 783
 784                /* technically won't happen as is_multipart_boundary()
 785                   will fail first.  But just in case..
 786                 */
 787                if (--mi->content_top < mi->content) {
 788                        fprintf(stderr, "Detected mismatched boundaries, "
 789                                        "can't recover\n");
 790                        exit(1);
 791                }
 792                handle_filter(mi, &newline);
 793                strbuf_release(&newline);
 794
 795                /* skip to the next boundary */
 796                if (!find_boundary(mi, line))
 797                        return 0;
 798                goto again;
 799        }
 800
 801        /* set some defaults */
 802        mi->transfer_encoding = TE_DONTCARE;
 803        strbuf_reset(&mi->charset);
 804
 805        /* slurp in this section's info */
 806        while (read_one_header_line(line, mi->input))
 807                check_header(mi, line, mi->p_hdr_data, 0);
 808
 809        strbuf_release(&newline);
 810        /* replenish line */
 811        if (strbuf_getline(line, mi->input, '\n'))
 812                return 0;
 813        strbuf_addch(line, '\n');
 814        return 1;
 815}
 816
 817static void handle_body(struct mailinfo *mi, struct strbuf *line)
 818{
 819        struct strbuf prev = STRBUF_INIT;
 820
 821        /* Skip up to the first boundary */
 822        if (*(mi->content_top)) {
 823                if (!find_boundary(mi, line))
 824                        goto handle_body_out;
 825        }
 826
 827        do {
 828                /* process any boundary lines */
 829                if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
 830                        /* flush any leftover */
 831                        if (prev.len) {
 832                                handle_filter(mi, &prev);
 833                                strbuf_reset(&prev);
 834                        }
 835                        if (!handle_boundary(mi, line))
 836                                goto handle_body_out;
 837                }
 838
 839                /* Unwrap transfer encoding */
 840                decode_transfer_encoding(mi, line);
 841
 842                switch (mi->transfer_encoding) {
 843                case TE_BASE64:
 844                case TE_QP:
 845                {
 846                        struct strbuf **lines, **it, *sb;
 847
 848                        /* Prepend any previous partial lines */
 849                        strbuf_insert(line, 0, prev.buf, prev.len);
 850                        strbuf_reset(&prev);
 851
 852                        /*
 853                         * This is a decoded line that may contain
 854                         * multiple new lines.  Pass only one chunk
 855                         * at a time to handle_filter()
 856                         */
 857                        lines = strbuf_split(line, '\n');
 858                        for (it = lines; (sb = *it); it++) {
 859                                if (*(it + 1) == NULL) /* The last line */
 860                                        if (sb->buf[sb->len - 1] != '\n') {
 861                                                /* Partial line, save it for later. */
 862                                                strbuf_addbuf(&prev, sb);
 863                                                break;
 864                                        }
 865                                handle_filter(mi, sb);
 866                        }
 867                        /*
 868                         * The partial chunk is saved in "prev" and will be
 869                         * appended by the next iteration of read_line_with_nul().
 870                         */
 871                        strbuf_list_free(lines);
 872                        break;
 873                }
 874                default:
 875                        handle_filter(mi, line);
 876                }
 877
 878        } while (!strbuf_getwholeline(line, mi->input, '\n'));
 879
 880handle_body_out:
 881        strbuf_release(&prev);
 882}
 883
 884static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
 885{
 886        const char *sp = data->buf;
 887        while (1) {
 888                char *ep = strchr(sp, '\n');
 889                int len;
 890                if (!ep)
 891                        len = strlen(sp);
 892                else
 893                        len = ep - sp;
 894                fprintf(fout, "%s: %.*s\n", hdr, len, sp);
 895                if (!ep)
 896                        break;
 897                sp = ep + 1;
 898        }
 899}
 900
 901static void handle_info(struct mailinfo *mi)
 902{
 903        struct strbuf *hdr;
 904        int i;
 905
 906        for (i = 0; header[i]; i++) {
 907                /* only print inbody headers if we output a patch file */
 908                if (mi->patch_lines && mi->s_hdr_data[i])
 909                        hdr = mi->s_hdr_data[i];
 910                else if (mi->p_hdr_data[i])
 911                        hdr = mi->p_hdr_data[i];
 912                else
 913                        continue;
 914
 915                if (!strcmp(header[i], "Subject")) {
 916                        if (!mi->keep_subject) {
 917                                cleanup_subject(mi, hdr);
 918                                cleanup_space(hdr);
 919                        }
 920                        output_header_lines(mi->output, "Subject", hdr);
 921                } else if (!strcmp(header[i], "From")) {
 922                        cleanup_space(hdr);
 923                        handle_from(mi, hdr);
 924                        fprintf(mi->output, "Author: %s\n", mi->name.buf);
 925                        fprintf(mi->output, "Email: %s\n", mi->email.buf);
 926                } else {
 927                        cleanup_space(hdr);
 928                        fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
 929                }
 930        }
 931        fprintf(mi->output, "\n");
 932}
 933
 934int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
 935{
 936        FILE *cmitmsg;
 937        int peek;
 938        struct strbuf line = STRBUF_INIT;
 939
 940        cmitmsg = fopen(msg, "w");
 941        if (!cmitmsg) {
 942                perror(msg);
 943                return -1;
 944        }
 945        mi->patchfile = fopen(patch, "w");
 946        if (!mi->patchfile) {
 947                perror(patch);
 948                fclose(cmitmsg);
 949                return -1;
 950        }
 951
 952        mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
 953        mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
 954
 955        do {
 956                peek = fgetc(mi->input);
 957        } while (isspace(peek));
 958        ungetc(peek, mi->input);
 959
 960        /* process the email header */
 961        while (read_one_header_line(&line, mi->input))
 962                check_header(mi, &line, mi->p_hdr_data, 1);
 963
 964        handle_body(mi, &line);
 965        fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
 966        fclose(cmitmsg);
 967        fclose(mi->patchfile);
 968
 969        handle_info(mi);
 970        strbuf_release(&line);
 971        return 0;
 972}
 973
 974static int git_mailinfo_config(const char *var, const char *value, void *mi_)
 975{
 976        struct mailinfo *mi = mi_;
 977
 978        if (!starts_with(var, "mailinfo."))
 979                return git_default_config(var, value, NULL);
 980        if (!strcmp(var, "mailinfo.scissors")) {
 981                mi->use_scissors = git_config_bool(var, value);
 982                return 0;
 983        }
 984        /* perhaps others here */
 985        return 0;
 986}
 987
 988void setup_mailinfo(struct mailinfo *mi)
 989{
 990        memset(mi, 0, sizeof(*mi));
 991        strbuf_init(&mi->name, 0);
 992        strbuf_init(&mi->email, 0);
 993        strbuf_init(&mi->charset, 0);
 994        strbuf_init(&mi->log_message, 0);
 995        mi->header_stage = 1;
 996        mi->use_inbody_headers = 1;
 997        mi->content_top = mi->content;
 998        git_config(git_mailinfo_config, &mi);
 999}
1000
1001void clear_mailinfo(struct mailinfo *mi)
1002{
1003        int i;
1004
1005        strbuf_release(&mi->name);
1006        strbuf_release(&mi->email);
1007        strbuf_release(&mi->charset);
1008        free(mi->message_id);
1009
1010        for (i = 0; mi->p_hdr_data[i]; i++)
1011                strbuf_release(mi->p_hdr_data[i]);
1012        free(mi->p_hdr_data);
1013        for (i = 0; mi->s_hdr_data[i]; i++)
1014                strbuf_release(mi->s_hdr_data[i]);
1015        free(mi->s_hdr_data);
1016
1017        while (mi->content < mi->content_top) {
1018                free(*(mi->content_top));
1019                mi->content_top--;
1020        }
1021
1022        strbuf_release(&mi->log_message);
1023}