mailinfo.c

   1 /*
   2  * Another stupid program, this one parsing the headers of an
   3  * email to figure out authorship and subject
   4  */
   5 #define _GNU_SOURCE
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <ctype.h>
  10 #ifndef NO_ICONV
  11 #include <iconv.h>
  12 #endif
  13 #include "git-compat-util.h"
  14 #include "cache.h"
  15
  16 static FILE *cmitmsg, *patchfile;
  17
  18 static int keep_subject = 0;
  19 static char *metainfo_charset = NULL;
  20 static char line[1000];
  21 static char date[1000];
  22 static char name[1000];
  23 static char email[1000];
  24 static char subject[1000];
  25
  26 static enum  {
  27         TE_DONTCARE, TE_QP, TE_BASE64,
  28 } transfer_encoding;
  29 static char charset[256];
  30
  31 static char multipart_boundary[1000];
  32 static int multipart_boundary_len;
  33 static int patch_lines = 0;
  34
  35 static char *sanity_check(char *name, char *email)
  36 {
  37         int len = strlen(name);
  38         if (len < 3 || len > 60)
  39                 return email;
  40         if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
  41                 return email;
  42         return name;
  43 }
  44
  45 static int bogus_from(char *line)
  46 {
  47         /* John Doe <johndoe> */
  48         char *bra, *ket, *dst, *cp;
  49
  50         /* This is fallback, so do not bother if we already have an
  51          * e-mail address.
  52          */
  53         if (*email)
  54                 return 0;
  55
  56         bra = strchr(line, '<');
  57         if (!bra)
  58                 return 0;
  59         ket = strchr(bra, '>');
  60         if (!ket)
  61                 return 0;
  62
  63         for (dst = email, cp = bra+1; cp < ket; )
  64                 *dst++ = *cp++;
  65         *dst = 0;
  66         for (cp = line; isspace(*cp); cp++)
  67                 ;
  68         for (bra--; isspace(*bra); bra--)
  69                 *bra = 0;
  70         cp = sanity_check(cp, email);
  71         strcpy(name, cp);
  72         return 1;
  73 }
  74
  75 static int handle_from(char *in_line)
  76 {
  77         char line[1000];
  78         char *at;
  79         char *dst;
  80
  81         strcpy(line, in_line);
  82         at = strchr(line, '@');
  83         if (!at)
  84                 return bogus_from(line);
  85
  86         /*
  87          * If we already have one email, don't take any confusing lines
  88          */
  89         if (*email && strchr(at+1, '@'))
  90                 return 0;
  91
  92         /* Pick up the string around '@', possibly delimited with <>
  93          * pair; that is the email part.  White them out while copying.
  94          */
  95         while (at > line) {
  96                 char c = at[-1];
  97                 if (isspace(c))
  98                         break;
  99                 if (c == '<') {
 100                         at[-1] = ' ';
 101                         break;
 102                 }
 103                 at--;
 104         }
 105         dst = email;
 106         for (;;) {
 107                 unsigned char c = *at;
 108                 if (!c || c == '>' || isspace(c)) {
 109                         if (c == '>')
 110                                 *at = ' ';
 111                         break;
 112                 }
 113                 *at++ = ' ';
 114                 *dst++ = c;
 115         }
 116         *dst++ = 0;
 117
 118         /* The remainder is name.  It could be "John Doe <john.doe@xz>"
 119          * or "john.doe@xz (John Doe)", but we have whited out the
 120          * email part, so trim from both ends, possibly removing
 121          * the () pair at the end.
 122          */
 123         at = line + strlen(line);
 124         while (at > line) {
 125                 unsigned char c = *--at;
 126                 if (!isspace(c)) {
 127                         at[(c == ')') ? 0 : 1] = 0;
 128                         break;
 129                 }
 130         }
 131
 132         at = line;
 133         for (;;) {
 134                 unsigned char c = *at;
 135                 if (!c || !isspace(c)) {
 136                         if (c == '(')
 137                                 at++;
 138                         break;
 139                 }
 140                 at++;
 141         }
 142         at = sanity_check(at, email);
 143         strcpy(name, at);
 144         return 1;
 145 }
 146
 147 static int handle_date(char *line)
 148 {
 149         strcpy(date, line);
 150         return 0;
 151 }
 152
 153 static int handle_subject(char *line)
 154 {
 155         strcpy(subject, line);
 156         return 0;
 157 }
 158
 159 /* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
 160  * to have enough heuristics to grok MIME encoded patches often found
 161  * on our mailing lists.  For example, we do not even treat header lines
 162  * case insensitively.
 163  */
 164
 165 static int slurp_attr(const char *line, const char *name, char *attr)
 166 {
 167         char *ends, *ap = strcasestr(line, name);
 168         size_t sz;
 169
 170         if (!ap) {
 171                 *attr = 0;
 172                 return 0;
 173         }
 174         ap += strlen(name);
 175         if (*ap == '"') {
 176                 ap++;
 177                 ends = "\"";
 178         }
 179         else
 180                 ends = "; \t";
 181         sz = strcspn(ap, ends);
 182         memcpy(attr, ap, sz);
 183         attr[sz] = 0;
 184         return 1;
 185 }
 186
 187 static int handle_subcontent_type(char *line)
 188 {
 189         /* We do not want to mess with boundary.  Note that we do not
 190          * handle nested multipart.
 191          */
 192         if (strcasestr(line, "boundary=")) {
 193                 fprintf(stderr, "Not handling nested multipart message.\n");
 194                 exit(1);
 195         }
 196         slurp_attr(line, "charset=", charset);
 197         if (*charset) {
 198                 int i, c;
 199                 for (i = 0; (c = charset[i]) != 0; i++)
 200                         charset[i] = tolower(c);
 201         }
 202         return 0;
 203 }
 204
 205 static int handle_content_type(char *line)
 206 {
 207         *multipart_boundary = 0;
 208         if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
 209                 memcpy(multipart_boundary, "--", 2);
 210                 multipart_boundary_len = strlen(multipart_boundary);
 211         }
 212         slurp_attr(line, "charset=", charset);
 213         return 0;
 214 }
 215
 216 static int handle_content_transfer_encoding(char *line)
 217 {
 218         if (strcasestr(line, "base64"))
 219                 transfer_encoding = TE_BASE64;
 220         else if (strcasestr(line, "quoted-printable"))
 221                 transfer_encoding = TE_QP;
 222         else
 223                 transfer_encoding = TE_DONTCARE;
 224         return 0;
 225 }
 226
 227 static int is_multipart_boundary(const char *line)
 228 {
 229         return (!memcmp(line, multipart_boundary, multipart_boundary_len));
 230 }
 231
 232 static int eatspace(char *line)
 233 {
 234         int len = strlen(line);
 235         while (len > 0 && isspace(line[len-1]))
 236                 line[--len] = 0;
 237         return len;
 238 }
 239
 240 #define SEEN_FROM 01
 241 #define SEEN_DATE 02
 242 #define SEEN_SUBJECT 04
 243 #define SEEN_BOGUS_UNIX_FROM 010
 244 #define SEEN_PREFIX  020
 245
 246 /* First lines of body can have From:, Date:, and Subject: */
 247 static void handle_inbody_header(int *seen, char *line)
 248 {
 249         if (!memcmp(">From", line, 5) && isspace(line[5])) {
 250                 if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
 251                         *seen |= SEEN_BOGUS_UNIX_FROM;
 252                         return;
 253                 }
 254         }
 255         if (!memcmp("From:", line, 5) && isspace(line[5])) {
 256                 if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 257                         *seen |= SEEN_FROM;
 258                         return;
 259                 }
 260         }
 261         if (!memcmp("Date:", line, 5) && isspace(line[5])) {
 262                 if (!(*seen & SEEN_DATE)) {
 263                         handle_date(line+6);
 264                         *seen |= SEEN_DATE;
 265                         return;
 266                 }
 267         }
 268         if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
 269                 if (!(*seen & SEEN_SUBJECT)) {
 270                         handle_subject(line+9);
 271                         *seen |= SEEN_SUBJECT;
 272                         return;
 273                 }
 274         }
 275         if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
 276                 if (!(*seen & SEEN_SUBJECT)) {
 277                         handle_subject(line);
 278                         *seen |= SEEN_SUBJECT;
 279                         return;
 280                 }
 281         }
 282         *seen |= SEEN_PREFIX;
 283 }
 284
 285 static char *cleanup_subject(char *subject)
 286 {
 287         if (keep_subject)
 288                 return subject;
 289         for (;;) {
 290                 char *p;
 291                 int len, remove;
 292                 switch (*subject) {
 293                 case 'r': case 'R':
 294                         if (!memcmp("e:", subject+1, 2)) {
 295                                 subject +=3;
 296                                 continue;
 297                         }
 298                         break;
 299                 case ' ': case '\t': case ':':
 300                         subject++;
 301                         continue;
 302
 303                 case '[':
 304                         p = strchr(subject, ']');
 305                         if (!p) {
 306                                 subject++;
 307                                 continue;
 308                         }
 309                         len = strlen(p);
 310                         remove = p - subject;
 311                         if (remove <= len *2) {
 312                                 subject = p+1;
 313                                 continue;
 314                         }
 315                         break;
 316                 }
 317                 return subject;
 318         }
 319 }
 320
 321 static void cleanup_space(char *buf)
 322 {
 323         unsigned char c;
 324         while ((c = *buf) != 0) {
 325                 buf++;
 326                 if (isspace(c)) {
 327                         buf[-1] = ' ';
 328                         c = *buf;
 329                         while (isspace(c)) {
 330                                 int len = strlen(buf);
 331                                 memmove(buf, buf+1, len);
 332                                 c = *buf;
 333                         }
 334                 }
 335         }
 336 }
 337
 338 static void decode_header_bq(char *it);
 339 typedef int (*header_fn_t)(char *);
 340 struct header_def {
 341         const char *name;
 342         header_fn_t func;
 343         int namelen;
 344 };
 345
 346 static void check_header(char *line, struct header_def *header)
 347 {
 348         int i;
 349
 350         if (header[0].namelen <= 0) {
 351                 for (i = 0; header[i].name; i++)
 352                         header[i].namelen = strlen(header[i].name);
 353         }
 354         for (i = 0; header[i].name; i++) {
 355                 int len = header[i].namelen;
 356                 if (!strncasecmp(line, header[i].name, len) &&
 357                     line[len] == ':' && isspace(line[len + 1])) {
 358                         /* Unwrap inline B and Q encoding, and optionally
 359                          * normalize the meta information to utf8.
 360                          */
 361                         decode_header_bq(line + len + 2);
 362                         header[i].func(line + len + 2);
 363                         break;
 364                 }
 365         }
 366 }
 367
 368 static void check_subheader_line(char *line)
 369 {
 370         static struct header_def header[] = {
 371                 { "Content-Type", handle_subcontent_type },
 372                 { "Content-Transfer-Encoding",
 373                   handle_content_transfer_encoding },
 374                 { NULL },
 375         };
 376         check_header(line, header);
 377 }
 378 static void check_header_line(char *line)
 379 {
 380         static struct header_def header[] = {
 381                 { "From", handle_from },
 382                 { "Date", handle_date },
 383                 { "Subject", handle_subject },
 384                 { "Content-Type", handle_content_type },
 385                 { "Content-Transfer-Encoding",
 386                   handle_content_transfer_encoding },
 387                 { NULL },
 388         };
 389         check_header(line, header);
 390 }
 391
 392 static int is_rfc2822_header(char *line)
 393 {
 394         /*
 395          * The section that defines the loosest possible
 396          * field name is "3.6.8 Optional fields".
 397          *
 398          * optional-field = field-name ":" unstructured CRLF
 399          * field-name = 1*ftext
 400          * ftext = %d33-57 / %59-126
 401          */
 402         int ch;
 403         char *cp = line;
 404         while ((ch = *cp++)) {
 405                 if (ch == ':')
 406                         return cp != line;
 407                 if ((33 <= ch && ch <= 57) ||
 408                     (59 <= ch && ch <= 126))
 409                         continue;
 410                 break;
 411         }
 412         return 0;
 413 }
 414
 415 static int read_one_header_line(char *line, int sz, FILE *in)
 416 {
 417         int ofs = 0;
 418         while (ofs < sz) {
 419                 int peek, len;
 420                 if (fgets(line + ofs, sz - ofs, in) == NULL)
 421                         break;
 422                 len = eatspace(line + ofs);
 423                 if (len == 0)
 424                         break;
 425                 if (!is_rfc2822_header(line)) {
 426                         /* Re-add the newline */
 427                         line[ofs + len] = '\n';
 428                         line[ofs + len + 1] = '\0';
 429                         break;
 430                 }
 431                 ofs += len;
 432                 /* Yuck, 2822 header "folding" */
 433                 peek = fgetc(in); ungetc(peek, in);
 434                 if (peek != ' ' && peek != '\t')
 435                         break;
 436         }
 437         /* Count mbox From headers as headers */
 438         if (!ofs && !memcmp(line, "From ", 5))
 439                 ofs = 1;
 440         return ofs;
 441 }
 442
 443 static unsigned hexval(int c)
 444 {
 445         if (c >= '0' && c <= '9')
 446                 return c - '0';
 447         if (c >= 'a' && c <= 'f')
 448                 return c - 'a' + 10;
 449         if (c >= 'A' && c <= 'F')
 450                 return c - 'A' + 10;
 451         return ~0;
 452 }
 453
 454 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 455 {
 456         int c;
 457         while ((c = *in++) != 0 && (in <= ep)) {
 458                 if (c == '=') {
 459                         int d = *in++;
 460                         if (d == '\n' || !d)
 461                                 break; /* drop trailing newline */
 462                         *ot++ = ((hexval(d) << 4) | hexval(*in++));
 463                         continue;
 464                 }
 465                 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 466                         c = 0x20;
 467                 *ot++ = c;
 468         }
 469         *ot = 0;
 470         return 0;
 471 }
 472
 473 static int decode_b_segment(char *in, char *ot, char *ep)
 474 {
 475         /* Decode in..ep, possibly in-place to ot */
 476         int c, pos = 0, acc = 0;
 477
 478         while ((c = *in++) != 0 && (in <= ep)) {
 479                 if (c == '+')
 480                         c = 62;
 481                 else if (c == '/')
 482                         c = 63;
 483                 else if ('A' <= c && c <= 'Z')
 484                         c -= 'A';
 485                 else if ('a' <= c && c <= 'z')
 486                         c -= 'a' - 26;
 487                 else if ('0' <= c && c <= '9')
 488                         c -= '0' - 52;
 489                 else if (c == '=') {
 490                         /* padding is almost like (c == 0), except we do
 491                          * not output NUL resulting only from it;
 492                          * for now we just trust the data.
 493                          */
 494                         c = 0;
 495                 }
 496                 else
 497                         continue; /* garbage */
 498                 switch (pos++) {
 499                 case 0:
 500                         acc = (c << 2);
 501                         break;
 502                 case 1:
 503                         *ot++ = (acc | (c >> 4));
 504                         acc = (c & 15) << 4;
 505                         break;
 506                 case 2:
 507                         *ot++ = (acc | (c >> 2));
 508                         acc = (c & 3) << 6;
 509                         break;
 510                 case 3:
 511                         *ot++ = (acc | c);
 512                         acc = pos = 0;
 513                         break;
 514                 }
 515         }
 516         *ot = 0;
 517         return 0;
 518 }
 519
 520 static void convert_to_utf8(char *line, char *charset)
 521 {
 522 #ifndef NO_ICONV
 523         char *in, *out;
 524         size_t insize, outsize, nrc;
 525         char outbuf[4096]; /* cheat */
 526         static char latin_one[] = "latin1";
 527         char *input_charset = *charset ? charset : latin_one;
 528         iconv_t conv = iconv_open(metainfo_charset, input_charset);
 529
 530         if (conv == (iconv_t) -1) {
 531                 static int warned_latin1_once = 0;
 532                 if (input_charset != latin_one) {
 533                         fprintf(stderr, "cannot convert from %s to %s\n",
 534                                 input_charset, metainfo_charset);
 535                         *charset = 0;
 536                 }
 537                 else if (!warned_latin1_once) {
 538                         warned_latin1_once = 1;
 539                         fprintf(stderr, "tried to convert from %s to %s, "
 540                                 "but your iconv does not work with it.\n",
 541                                 input_charset, metainfo_charset);
 542                 }
 543                 return;
 544         }
 545         in = line;
 546         insize = strlen(in);
 547         out = outbuf;
 548         outsize = sizeof(outbuf);
 549         nrc = iconv(conv, &in, &insize, &out, &outsize);
 550         iconv_close(conv);
 551         if (nrc == (size_t) -1)
 552                 return;
 553         *out = 0;
 554         strcpy(line, outbuf);
 555 #endif
 556 }
 557
 558 static void decode_header_bq(char *it)
 559 {
 560         char *in, *out, *ep, *cp, *sp;
 561         char outbuf[1000];
 562
 563         in = it;
 564         out = outbuf;
 565         while ((ep = strstr(in, "=?")) != NULL) {
 566                 int sz, encoding;
 567                 char charset_q[256], piecebuf[256];
 568                 if (in != ep) {
 569                         sz = ep - in;
 570                         memcpy(out, in, sz);
 571                         out += sz;
 572                         in += sz;
 573                 }
 574                 /* E.g.
 575                  * ep : "=?iso-2022-jp?B?GyR...?= foo"
 576                  * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 577                  */
 578                 ep += 2;
 579                 cp = strchr(ep, '?');
 580                 if (!cp)
 581                         return; /* no munging */
 582                 for (sp = ep; sp < cp; sp++)
 583                         charset_q[sp - ep] = tolower(*sp);
 584                 charset_q[cp - ep] = 0;
 585                 encoding = cp[1];
 586                 if (!encoding || cp[2] != '?')
 587                         return; /* no munging */
 588                 ep = strstr(cp + 3, "?=");
 589                 if (!ep)
 590                         return; /* no munging */
 591                 switch (tolower(encoding)) {
 592                 default:
 593                         return; /* no munging */
 594                 case 'b':
 595                         sz = decode_b_segment(cp + 3, piecebuf, ep);
 596                         break;
 597                 case 'q':
 598                         sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 599                         break;
 600                 }
 601                 if (sz < 0)
 602                         return;
 603                 if (metainfo_charset)
 604                         convert_to_utf8(piecebuf, charset_q);
 605                 strcpy(out, piecebuf);
 606                 out += strlen(out);
 607                 in = ep + 2;
 608         }
 609         strcpy(out, in);
 610         strcpy(it, outbuf);
 611 }
 612
 613 static void decode_transfer_encoding(char *line)
 614 {
 615         char *ep;
 616
 617         switch (transfer_encoding) {
 618         case TE_QP:
 619                 ep = line + strlen(line);
 620                 decode_q_segment(line, line, ep, 0);
 621                 break;
 622         case TE_BASE64:
 623                 ep = line + strlen(line);
 624                 decode_b_segment(line, line, ep);
 625                 break;
 626         case TE_DONTCARE:
 627                 break;
 628         }
 629 }
 630
 631 static void handle_info(void)
 632 {
 633         char *sub;
 634
 635         sub = cleanup_subject(subject);
 636         cleanup_space(name);
 637         cleanup_space(date);
 638         cleanup_space(email);
 639         cleanup_space(sub);
 640
 641         printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
 642                name, email, sub, date);
 643 }
 644
 645 /* We are inside message body and have read line[] already.
 646  * Spit out the commit log.
 647  */
 648 static int handle_commit_msg(int *seen)
 649 {
 650         if (!cmitmsg)
 651                 return 0;
 652         do {
 653                 if (!memcmp("diff -", line, 6) ||
 654                     !memcmp("---", line, 3) ||
 655                     !memcmp("Index: ", line, 7))
 656                         break;
 657                 if ((multipart_boundary[0] && is_multipart_boundary(line))) {
 658                         /* We come here when the first part had only
 659                          * the commit message without any patch.  We
 660                          * pretend we have not seen this line yet, and
 661                          * go back to the loop.
 662                          */
 663                         return 1;
 664                 }
 665
 666                 /* Unwrap transfer encoding and optionally
 667                  * normalize the log message to UTF-8.
 668                  */
 669                 decode_transfer_encoding(line);
 670                 if (metainfo_charset)
 671                         convert_to_utf8(line, charset);
 672
 673                 handle_inbody_header(seen, line);
 674                 if (!(*seen & SEEN_PREFIX))
 675                         continue;
 676
 677                 fputs(line, cmitmsg);
 678         } while (fgets(line, sizeof(line), stdin) != NULL);
 679         fclose(cmitmsg);
 680         cmitmsg = NULL;
 681         return 0;
 682 }
 683
 684 /* We have done the commit message and have the first
 685  * line of the patch in line[].
 686  */
 687 static void handle_patch(void)
 688 {
 689         do {
 690                 if (multipart_boundary[0] && is_multipart_boundary(line))
 691                         break;
 692                 /* Only unwrap transfer encoding but otherwise do not
 693                  * do anything.  We do *NOT* want UTF-8 conversion
 694                  * here; we are dealing with the user payload.
 695                  */
 696                 decode_transfer_encoding(line);
 697                 fputs(line, patchfile);
 698                 patch_lines++;
 699         } while (fgets(line, sizeof(line), stdin) != NULL);
 700 }
 701
 702 /* multipart boundary and transfer encoding are set up for us, and we
 703  * are at the end of the sub header.  do equivalent of handle_body up
 704  * to the next boundary without closing patchfile --- we will expect
 705  * that the first part to contain commit message and a patch, and
 706  * handle other parts as pure patches.
 707  */
 708 static int handle_multipart_one_part(int *seen)
 709 {
 710         int n = 0;
 711
 712         while (fgets(line, sizeof(line), stdin) != NULL) {
 713         again:
 714                 n++;
 715                 if (is_multipart_boundary(line))
 716                         break;
 717                 if (handle_commit_msg(seen))
 718                         goto again;
 719                 handle_patch();
 720                 break;
 721         }
 722         if (n == 0)
 723                 return -1;
 724         return 0;
 725 }
 726
 727 static void handle_multipart_body(void)
 728 {
 729         int seen = 0;
 730         int part_num = 0;
 731
 732         /* Skip up to the first boundary */
 733         while (fgets(line, sizeof(line), stdin) != NULL)
 734                 if (is_multipart_boundary(line)) {
 735                         part_num = 1;
 736                         break;
 737                 }
 738         if (!part_num)
 739                 return;
 740         /* We are on boundary line.  Start slurping the subhead. */
 741         while (1) {
 742                 int hdr = read_one_header_line(line, sizeof(line), stdin);
 743                 if (!hdr) {
 744                         if (handle_multipart_one_part(&seen) < 0)
 745                                 return;
 746                         /* Reset per part headers */
 747                         transfer_encoding = TE_DONTCARE;
 748                         charset[0] = 0;
 749                 }
 750                 else
 751                         check_subheader_line(line);
 752         }
 753         fclose(patchfile);
 754         if (!patch_lines) {
 755                 fprintf(stderr, "No patch found\n");
 756                 exit(1);
 757         }
 758 }
 759
 760 /* Non multipart message */
 761 static void handle_body(void)
 762 {
 763         int seen = 0;
 764
 765         if (line[0] || fgets(line, sizeof(line), stdin) != NULL) {
 766                 handle_commit_msg(&seen);
 767                 handle_patch();
 768         }
 769         fclose(patchfile);
 770         if (!patch_lines) {
 771                 fprintf(stderr, "No patch found\n");
 772                 exit(1);
 773         }
 774 }
 775
 776 static const char mailinfo_usage[] =
 777         "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
 778
 779 int main(int argc, char **argv)
 780 {
 781         /* NEEDSWORK: might want to do the optional .git/ directory
 782          * discovery
 783          */
 784         git_config(git_default_config);
 785
 786         while (1 < argc && argv[1][0] == '-') {
 787                 if (!strcmp(argv[1], "-k"))
 788                         keep_subject = 1;
 789                 else if (!strcmp(argv[1], "-u"))
 790                         metainfo_charset = git_commit_encoding;
 791                 else if (!strncmp(argv[1], "--encoding=", 11))
 792                         metainfo_charset = argv[1] + 11;
 793                 else
 794                         usage(mailinfo_usage);
 795                 argc--; argv++;
 796         }
 797
 798         if (argc != 3)
 799                 usage(mailinfo_usage);
 800         cmitmsg = fopen(argv[1], "w");
 801         if (!cmitmsg) {
 802                 perror(argv[1]);
 803                 exit(1);
 804         }
 805         patchfile = fopen(argv[2], "w");
 806         if (!patchfile) {
 807                 perror(argv[2]);
 808                 exit(1);
 809         }
 810         while (1) {
 811                 int hdr = read_one_header_line(line, sizeof(line), stdin);
 812                 if (!hdr) {
 813                         if (multipart_boundary[0])
 814                                 handle_multipart_body();
 815                         else
 816                                 handle_body();
 817                         handle_info();
 818                         break;
 819                 }
 820                 check_header_line(line);
 821         }
 822         return 0;
 823 }