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_PREFIX  0x08
 244
 245 /* First lines of body can have From:, Date:, and Subject: */
 246 static void handle_inbody_header(int *seen, char *line)
 247 {
 248         if (!memcmp("From:", line, 5) && isspace(line[5])) {
 249                 if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 250                         *seen |= SEEN_FROM;
 251                         return;
 252                 }
 253         }
 254         if (!memcmp("Date:", line, 5) && isspace(line[5])) {
 255                 if (!(*seen & SEEN_DATE)) {
 256                         handle_date(line+6);
 257                         *seen |= SEEN_DATE;
 258                         return;
 259                 }
 260         }
 261         if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
 262                 if (!(*seen & SEEN_SUBJECT)) {
 263                         handle_subject(line+9);
 264                         *seen |= SEEN_SUBJECT;
 265                         return;
 266                 }
 267         }
 268         if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
 269                 if (!(*seen & SEEN_SUBJECT)) {
 270                         handle_subject(line);
 271                         *seen |= SEEN_SUBJECT;
 272                         return;
 273                 }
 274         }
 275         *seen |= SEEN_PREFIX;
 276 }
 277
 278 static char *cleanup_subject(char *subject)
 279 {
 280         if (keep_subject)
 281                 return subject;
 282         for (;;) {
 283                 char *p;
 284                 int len, remove;
 285                 switch (*subject) {
 286                 case 'r': case 'R':
 287                         if (!memcmp("e:", subject+1, 2)) {
 288                                 subject +=3;
 289                                 continue;
 290                         }
 291                         break;
 292                 case ' ': case '\t': case ':':
 293                         subject++;
 294                         continue;
 295
 296                 case '[':
 297                         p = strchr(subject, ']');
 298                         if (!p) {
 299                                 subject++;
 300                                 continue;
 301                         }
 302                         len = strlen(p);
 303                         remove = p - subject;
 304                         if (remove <= len *2) {
 305                                 subject = p+1;
 306                                 continue;
 307                         }
 308                         break;
 309                 }
 310                 return subject;
 311         }
 312 }
 313
 314 static void cleanup_space(char *buf)
 315 {
 316         unsigned char c;
 317         while ((c = *buf) != 0) {
 318                 buf++;
 319                 if (isspace(c)) {
 320                         buf[-1] = ' ';
 321                         c = *buf;
 322                         while (isspace(c)) {
 323                                 int len = strlen(buf);
 324                                 memmove(buf, buf+1, len);
 325                                 c = *buf;
 326                         }
 327                 }
 328         }
 329 }
 330
 331 static void decode_header_bq(char *it);
 332 typedef int (*header_fn_t)(char *);
 333 struct header_def {
 334         const char *name;
 335         header_fn_t func;
 336         int namelen;
 337 };
 338
 339 static void check_header(char *line, struct header_def *header)
 340 {
 341         int i;
 342
 343         if (header[0].namelen <= 0) {
 344                 for (i = 0; header[i].name; i++)
 345                         header[i].namelen = strlen(header[i].name);
 346         }
 347         for (i = 0; header[i].name; i++) {
 348                 int len = header[i].namelen;
 349                 if (!strncasecmp(line, header[i].name, len) &&
 350                     line[len] == ':' && isspace(line[len + 1])) {
 351                         /* Unwrap inline B and Q encoding, and optionally
 352                          * normalize the meta information to utf8.
 353                          */
 354                         decode_header_bq(line + len + 2);
 355                         header[i].func(line + len + 2);
 356                         break;
 357                 }
 358         }
 359 }
 360
 361 static void check_subheader_line(char *line)
 362 {
 363         static struct header_def header[] = {
 364                 { "Content-Type", handle_subcontent_type },
 365                 { "Content-Transfer-Encoding",
 366                   handle_content_transfer_encoding },
 367                 { NULL },
 368         };
 369         check_header(line, header);
 370 }
 371 static void check_header_line(char *line)
 372 {
 373         static struct header_def header[] = {
 374                 { "From", handle_from },
 375                 { "Date", handle_date },
 376                 { "Subject", handle_subject },
 377                 { "Content-Type", handle_content_type },
 378                 { "Content-Transfer-Encoding",
 379                   handle_content_transfer_encoding },
 380                 { NULL },
 381         };
 382         check_header(line, header);
 383 }
 384
 385 static int is_rfc2822_header(char *line)
 386 {
 387         /*
 388          * The section that defines the loosest possible
 389          * field name is "3.6.8 Optional fields".
 390          *
 391          * optional-field = field-name ":" unstructured CRLF
 392          * field-name = 1*ftext
 393          * ftext = %d33-57 / %59-126
 394          */
 395         int ch;
 396         char *cp = line;
 397         while ((ch = *cp++)) {
 398                 if (ch == ':')
 399                         return cp != line;
 400                 if ((33 <= ch && ch <= 57) ||
 401                     (59 <= ch && ch <= 126))
 402                         continue;
 403                 break;
 404         }
 405         return 0;
 406 }
 407
 408 static int read_one_header_line(char *line, int sz, FILE *in)
 409 {
 410         int ofs = 0;
 411         while (ofs < sz) {
 412                 int peek, len;
 413                 if (fgets(line + ofs, sz - ofs, in) == NULL)
 414                         break;
 415                 len = eatspace(line + ofs);
 416                 if (len == 0)
 417                         break;
 418                 if (!is_rfc2822_header(line)) {
 419                         /* Re-add the newline */
 420                         line[ofs + len] = '\n';
 421                         line[ofs + len + 1] = '\0';
 422                         break;
 423                 }
 424                 ofs += len;
 425                 /* Yuck, 2822 header "folding" */
 426                 peek = fgetc(in); ungetc(peek, in);
 427                 if (peek != ' ' && peek != '\t')
 428                         break;
 429         }
 430         /* Count mbox From headers as headers */
 431         if (!ofs && !memcmp(line, "From ", 5))
 432                 ofs = 1;
 433         return ofs;
 434 }
 435
 436 static unsigned hexval(int c)
 437 {
 438         if (c >= '0' && c <= '9')
 439                 return c - '0';
 440         if (c >= 'a' && c <= 'f')
 441                 return c - 'a' + 10;
 442         if (c >= 'A' && c <= 'F')
 443                 return c - 'A' + 10;
 444         return ~0;
 445 }
 446
 447 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 448 {
 449         int c;
 450         while ((c = *in++) != 0 && (in <= ep)) {
 451                 if (c == '=') {
 452                         int d = *in++;
 453                         if (d == '\n' || !d)
 454                                 break; /* drop trailing newline */
 455                         *ot++ = ((hexval(d) << 4) | hexval(*in++));
 456                         continue;
 457                 }
 458                 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 459                         c = 0x20;
 460                 *ot++ = c;
 461         }
 462         *ot = 0;
 463         return 0;
 464 }
 465
 466 static int decode_b_segment(char *in, char *ot, char *ep)
 467 {
 468         /* Decode in..ep, possibly in-place to ot */
 469         int c, pos = 0, acc = 0;
 470
 471         while ((c = *in++) != 0 && (in <= ep)) {
 472                 if (c == '+')
 473                         c = 62;
 474                 else if (c == '/')
 475                         c = 63;
 476                 else if ('A' <= c && c <= 'Z')
 477                         c -= 'A';
 478                 else if ('a' <= c && c <= 'z')
 479                         c -= 'a' - 26;
 480                 else if ('0' <= c && c <= '9')
 481                         c -= '0' - 52;
 482                 else if (c == '=') {
 483                         /* padding is almost like (c == 0), except we do
 484                          * not output NUL resulting only from it;
 485                          * for now we just trust the data.
 486                          */
 487                         c = 0;
 488                 }
 489                 else
 490                         continue; /* garbage */
 491                 switch (pos++) {
 492                 case 0:
 493                         acc = (c << 2);
 494                         break;
 495                 case 1:
 496                         *ot++ = (acc | (c >> 4));
 497                         acc = (c & 15) << 4;
 498                         break;
 499                 case 2:
 500                         *ot++ = (acc | (c >> 2));
 501                         acc = (c & 3) << 6;
 502                         break;
 503                 case 3:
 504                         *ot++ = (acc | c);
 505                         acc = pos = 0;
 506                         break;
 507                 }
 508         }
 509         *ot = 0;
 510         return 0;
 511 }
 512
 513 static void convert_to_utf8(char *line, char *charset)
 514 {
 515 #ifndef NO_ICONV
 516         char *in, *out;
 517         size_t insize, outsize, nrc;
 518         char outbuf[4096]; /* cheat */
 519         static char latin_one[] = "latin1";
 520         char *input_charset = *charset ? charset : latin_one;
 521         iconv_t conv = iconv_open(metainfo_charset, input_charset);
 522
 523         if (conv == (iconv_t) -1) {
 524                 static int warned_latin1_once = 0;
 525                 if (input_charset != latin_one) {
 526                         fprintf(stderr, "cannot convert from %s to %s\n",
 527                                 input_charset, metainfo_charset);
 528                         *charset = 0;
 529                 }
 530                 else if (!warned_latin1_once) {
 531                         warned_latin1_once = 1;
 532                         fprintf(stderr, "tried to convert from %s to %s, "
 533                                 "but your iconv does not work with it.\n",
 534                                 input_charset, metainfo_charset);
 535                 }
 536                 return;
 537         }
 538         in = line;
 539         insize = strlen(in);
 540         out = outbuf;
 541         outsize = sizeof(outbuf);
 542         nrc = iconv(conv, &in, &insize, &out, &outsize);
 543         iconv_close(conv);
 544         if (nrc == (size_t) -1)
 545                 return;
 546         *out = 0;
 547         strcpy(line, outbuf);
 548 #endif
 549 }
 550
 551 static void decode_header_bq(char *it)
 552 {
 553         char *in, *out, *ep, *cp, *sp;
 554         char outbuf[1000];
 555
 556         in = it;
 557         out = outbuf;
 558         while ((ep = strstr(in, "=?")) != NULL) {
 559                 int sz, encoding;
 560                 char charset_q[256], piecebuf[256];
 561                 if (in != ep) {
 562                         sz = ep - in;
 563                         memcpy(out, in, sz);
 564                         out += sz;
 565                         in += sz;
 566                 }
 567                 /* E.g.
 568                  * ep : "=?iso-2022-jp?B?GyR...?= foo"
 569                  * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 570                  */
 571                 ep += 2;
 572                 cp = strchr(ep, '?');
 573                 if (!cp)
 574                         return; /* no munging */
 575                 for (sp = ep; sp < cp; sp++)
 576                         charset_q[sp - ep] = tolower(*sp);
 577                 charset_q[cp - ep] = 0;
 578                 encoding = cp[1];
 579                 if (!encoding || cp[2] != '?')
 580                         return; /* no munging */
 581                 ep = strstr(cp + 3, "?=");
 582                 if (!ep)
 583                         return; /* no munging */
 584                 switch (tolower(encoding)) {
 585                 default:
 586                         return; /* no munging */
 587                 case 'b':
 588                         sz = decode_b_segment(cp + 3, piecebuf, ep);
 589                         break;
 590                 case 'q':
 591                         sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 592                         break;
 593                 }
 594                 if (sz < 0)
 595                         return;
 596                 if (metainfo_charset)
 597                         convert_to_utf8(piecebuf, charset_q);
 598                 strcpy(out, piecebuf);
 599                 out += strlen(out);
 600                 in = ep + 2;
 601         }
 602         strcpy(out, in);
 603         strcpy(it, outbuf);
 604 }
 605
 606 static void decode_transfer_encoding(char *line)
 607 {
 608         char *ep;
 609
 610         switch (transfer_encoding) {
 611         case TE_QP:
 612                 ep = line + strlen(line);
 613                 decode_q_segment(line, line, ep, 0);
 614                 break;
 615         case TE_BASE64:
 616                 ep = line + strlen(line);
 617                 decode_b_segment(line, line, ep);
 618                 break;
 619         case TE_DONTCARE:
 620                 break;
 621         }
 622 }
 623
 624 static void handle_info(void)
 625 {
 626         char *sub;
 627
 628         sub = cleanup_subject(subject);
 629         cleanup_space(name);
 630         cleanup_space(date);
 631         cleanup_space(email);
 632         cleanup_space(sub);
 633
 634         printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
 635                name, email, sub, date);
 636 }
 637
 638 /* We are inside message body and have read line[] already.
 639  * Spit out the commit log.
 640  */
 641 static int handle_commit_msg(int *seen)
 642 {
 643         if (!cmitmsg)
 644                 return 0;
 645         do {
 646                 if (!memcmp("diff -", line, 6) ||
 647                     !memcmp("---", line, 3) ||
 648                     !memcmp("Index: ", line, 7))
 649                         break;
 650                 if ((multipart_boundary[0] && is_multipart_boundary(line))) {
 651                         /* We come here when the first part had only
 652                          * the commit message without any patch.  We
 653                          * pretend we have not seen this line yet, and
 654                          * go back to the loop.
 655                          */
 656                         return 1;
 657                 }
 658
 659                 /* Unwrap transfer encoding and optionally
 660                  * normalize the log message to UTF-8.
 661                  */
 662                 decode_transfer_encoding(line);
 663                 if (metainfo_charset)
 664                         convert_to_utf8(line, charset);
 665
 666                 handle_inbody_header(seen, line);
 667                 if (!(*seen & SEEN_PREFIX))
 668                         continue;
 669
 670                 fputs(line, cmitmsg);
 671         } while (fgets(line, sizeof(line), stdin) != NULL);
 672         fclose(cmitmsg);
 673         cmitmsg = NULL;
 674         return 0;
 675 }
 676
 677 /* We have done the commit message and have the first
 678  * line of the patch in line[].
 679  */
 680 static void handle_patch(void)
 681 {
 682         do {
 683                 if (multipart_boundary[0] && is_multipart_boundary(line))
 684                         break;
 685                 /* Only unwrap transfer encoding but otherwise do not
 686                  * do anything.  We do *NOT* want UTF-8 conversion
 687                  * here; we are dealing with the user payload.
 688                  */
 689                 decode_transfer_encoding(line);
 690                 fputs(line, patchfile);
 691                 patch_lines++;
 692         } while (fgets(line, sizeof(line), stdin) != NULL);
 693 }
 694
 695 /* multipart boundary and transfer encoding are set up for us, and we
 696  * are at the end of the sub header.  do equivalent of handle_body up
 697  * to the next boundary without closing patchfile --- we will expect
 698  * that the first part to contain commit message and a patch, and
 699  * handle other parts as pure patches.
 700  */
 701 static int handle_multipart_one_part(int *seen)
 702 {
 703         int n = 0;
 704
 705         while (fgets(line, sizeof(line), stdin) != NULL) {
 706         again:
 707                 n++;
 708                 if (is_multipart_boundary(line))
 709                         break;
 710                 if (handle_commit_msg(seen))
 711                         goto again;
 712                 handle_patch();
 713                 break;
 714         }
 715         if (n == 0)
 716                 return -1;
 717         return 0;
 718 }
 719
 720 static void handle_multipart_body(void)
 721 {
 722         int seen = 0;
 723         int part_num = 0;
 724
 725         /* Skip up to the first boundary */
 726         while (fgets(line, sizeof(line), stdin) != NULL)
 727                 if (is_multipart_boundary(line)) {
 728                         part_num = 1;
 729                         break;
 730                 }
 731         if (!part_num)
 732                 return;
 733         /* We are on boundary line.  Start slurping the subhead. */
 734         while (1) {
 735                 int hdr = read_one_header_line(line, sizeof(line), stdin);
 736                 if (!hdr) {
 737                         if (handle_multipart_one_part(&seen) < 0)
 738                                 return;
 739                         /* Reset per part headers */
 740                         transfer_encoding = TE_DONTCARE;
 741                         charset[0] = 0;
 742                 }
 743                 else
 744                         check_subheader_line(line);
 745         }
 746         fclose(patchfile);
 747         if (!patch_lines) {
 748                 fprintf(stderr, "No patch found\n");
 749                 exit(1);
 750         }
 751 }
 752
 753 /* Non multipart message */
 754 static void handle_body(void)
 755 {
 756         int seen = 0;
 757
 758         if (line[0] || fgets(line, sizeof(line), stdin) != NULL) {
 759                 handle_commit_msg(&seen);
 760                 handle_patch();
 761         }
 762         fclose(patchfile);
 763         if (!patch_lines) {
 764                 fprintf(stderr, "No patch found\n");
 765                 exit(1);
 766         }
 767 }
 768
 769 static const char mailinfo_usage[] =
 770         "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
 771
 772 int main(int argc, char **argv)
 773 {
 774         /* NEEDSWORK: might want to do the optional .git/ directory
 775          * discovery
 776          */
 777         git_config(git_default_config);
 778
 779         while (1 < argc && argv[1][0] == '-') {
 780                 if (!strcmp(argv[1], "-k"))
 781                         keep_subject = 1;
 782                 else if (!strcmp(argv[1], "-u"))
 783                         metainfo_charset = git_commit_encoding;
 784                 else if (!strncmp(argv[1], "--encoding=", 11))
 785                         metainfo_charset = argv[1] + 11;
 786                 else
 787                         usage(mailinfo_usage);
 788                 argc--; argv++;
 789         }
 790
 791         if (argc != 3)
 792                 usage(mailinfo_usage);
 793         cmitmsg = fopen(argv[1], "w");
 794         if (!cmitmsg) {
 795                 perror(argv[1]);
 796                 exit(1);
 797         }
 798         patchfile = fopen(argv[2], "w");
 799         if (!patchfile) {
 800                 perror(argv[2]);
 801                 exit(1);
 802         }
 803         while (1) {
 804                 int hdr = read_one_header_line(line, sizeof(line), stdin);
 805                 if (!hdr) {
 806                         if (multipart_boundary[0])
 807                                 handle_multipart_body();
 808                         else
 809                                 handle_body();
 810                         handle_info();
 811                         break;
 812                 }
 813                 check_header_line(line);
 814         }
 815         return 0;
 816 }