builtin-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 #include "builtin.h"
  16
  17 static FILE *cmitmsg, *patchfile, *fin, *fout;
  18
  19 static int keep_subject = 0;
  20 static const char *metainfo_charset = NULL;
  21 static char line[1000];
  22 static char date[1000];
  23 static char name[1000];
  24 static char email[1000];
  25 static char subject[1000];
  26
  27 static enum  {
  28         TE_DONTCARE, TE_QP, TE_BASE64,
  29 } transfer_encoding;
  30 static char charset[256];
  31
  32 static char multipart_boundary[1000];
  33 static int multipart_boundary_len;
  34 static int patch_lines = 0;
  35
  36 static char *sanity_check(char *name, char *email)
  37 {
  38         int len = strlen(name);
  39         if (len < 3 || len > 60)
  40                 return email;
  41         if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
  42                 return email;
  43         return name;
  44 }
  45
  46 static int bogus_from(char *line)
  47 {
  48         /* John Doe <johndoe> */
  49         char *bra, *ket, *dst, *cp;
  50
  51         /* This is fallback, so do not bother if we already have an
  52          * e-mail address.
  53          */
  54         if (*email)
  55                 return 0;
  56
  57         bra = strchr(line, '<');
  58         if (!bra)
  59                 return 0;
  60         ket = strchr(bra, '>');
  61         if (!ket)
  62                 return 0;
  63
  64         for (dst = email, cp = bra+1; cp < ket; )
  65                 *dst++ = *cp++;
  66         *dst = 0;
  67         for (cp = line; isspace(*cp); cp++)
  68                 ;
  69         for (bra--; isspace(*bra); bra--)
  70                 *bra = 0;
  71         cp = sanity_check(cp, email);
  72         strcpy(name, cp);
  73         return 1;
  74 }
  75
  76 static int handle_from(char *in_line)
  77 {
  78         char line[1000];
  79         char *at;
  80         char *dst;
  81
  82         strcpy(line, in_line);
  83         at = strchr(line, '@');
  84         if (!at)
  85                 return bogus_from(line);
  86
  87         /*
  88          * If we already have one email, don't take any confusing lines
  89          */
  90         if (*email && strchr(at+1, '@'))
  91                 return 0;
  92
  93         /* Pick up the string around '@', possibly delimited with <>
  94          * pair; that is the email part.  White them out while copying.
  95          */
  96         while (at > line) {
  97                 char c = at[-1];
  98                 if (isspace(c))
  99                         break;
 100                 if (c == '<') {
 101                         at[-1] = ' ';
 102                         break;
 103                 }
 104                 at--;
 105         }
 106         dst = email;
 107         for (;;) {
 108                 unsigned char c = *at;
 109                 if (!c || c == '>' || isspace(c)) {
 110                         if (c == '>')
 111                                 *at = ' ';
 112                         break;
 113                 }
 114                 *at++ = ' ';
 115                 *dst++ = c;
 116         }
 117         *dst++ = 0;
 118
 119         /* The remainder is name.  It could be "John Doe <john.doe@xz>"
 120          * or "john.doe@xz (John Doe)", but we have whited out the
 121          * email part, so trim from both ends, possibly removing
 122          * the () pair at the end.
 123          */
 124         at = line + strlen(line);
 125         while (at > line) {
 126                 unsigned char c = *--at;
 127                 if (!isspace(c)) {
 128                         at[(c == ')') ? 0 : 1] = 0;
 129                         break;
 130                 }
 131         }
 132
 133         at = line;
 134         for (;;) {
 135                 unsigned char c = *at;
 136                 if (!c || !isspace(c)) {
 137                         if (c == '(')
 138                                 at++;
 139                         break;
 140                 }
 141                 at++;
 142         }
 143         at = sanity_check(at, email);
 144         strcpy(name, at);
 145         return 1;
 146 }
 147
 148 static int handle_date(char *line)
 149 {
 150         strcpy(date, line);
 151         return 0;
 152 }
 153
 154 static int handle_subject(char *line)
 155 {
 156         strcpy(subject, line);
 157         return 0;
 158 }
 159
 160 /* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
 161  * to have enough heuristics to grok MIME encoded patches often found
 162  * on our mailing lists.  For example, we do not even treat header lines
 163  * case insensitively.
 164  */
 165
 166 static int slurp_attr(const char *line, const char *name, char *attr)
 167 {
 168         const char *ends, *ap = strcasestr(line, name);
 169         size_t sz;
 170
 171         if (!ap) {
 172                 *attr = 0;
 173                 return 0;
 174         }
 175         ap += strlen(name);
 176         if (*ap == '"') {
 177                 ap++;
 178                 ends = "\"";
 179         }
 180         else
 181                 ends = "; \t";
 182         sz = strcspn(ap, ends);
 183         memcpy(attr, ap, sz);
 184         attr[sz] = 0;
 185         return 1;
 186 }
 187
 188 static int handle_subcontent_type(char *line)
 189 {
 190         /* We do not want to mess with boundary.  Note that we do not
 191          * handle nested multipart.
 192          */
 193         if (strcasestr(line, "boundary=")) {
 194                 fprintf(stderr, "Not handling nested multipart message.\n");
 195                 exit(1);
 196         }
 197         slurp_attr(line, "charset=", charset);
 198         if (*charset) {
 199                 int i, c;
 200                 for (i = 0; (c = charset[i]) != 0; i++)
 201                         charset[i] = tolower(c);
 202         }
 203         return 0;
 204 }
 205
 206 static int handle_content_type(char *line)
 207 {
 208         *multipart_boundary = 0;
 209         if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
 210                 memcpy(multipart_boundary, "--", 2);
 211                 multipart_boundary_len = strlen(multipart_boundary);
 212         }
 213         slurp_attr(line, "charset=", charset);
 214         return 0;
 215 }
 216
 217 static int handle_content_transfer_encoding(char *line)
 218 {
 219         if (strcasestr(line, "base64"))
 220                 transfer_encoding = TE_BASE64;
 221         else if (strcasestr(line, "quoted-printable"))
 222                 transfer_encoding = TE_QP;
 223         else
 224                 transfer_encoding = TE_DONTCARE;
 225         return 0;
 226 }
 227
 228 static int is_multipart_boundary(const char *line)
 229 {
 230         return (!memcmp(line, multipart_boundary, multipart_boundary_len));
 231 }
 232
 233 static int eatspace(char *line)
 234 {
 235         int len = strlen(line);
 236         while (len > 0 && isspace(line[len-1]))
 237                 line[--len] = 0;
 238         return len;
 239 }
 240
 241 #define SEEN_FROM 01
 242 #define SEEN_DATE 02
 243 #define SEEN_SUBJECT 04
 244 #define SEEN_BOGUS_UNIX_FROM 010
 245 #define SEEN_PREFIX  020
 246
 247 /* First lines of body can have From:, Date:, and Subject: or empty */
 248 static void handle_inbody_header(int *seen, char *line)
 249 {
 250         if (*seen & SEEN_PREFIX)
 251                 return;
 252         if (isspace(*line)) {
 253                 char *cp;
 254                 for (cp = line + 1; *cp; cp++) {
 255                         if (!isspace(*cp))
 256                                 break;
 257                 }
 258                 if (!*cp)
 259                         return;
 260         }
 261         if (!memcmp(">From", line, 5) && isspace(line[5])) {
 262                 if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
 263                         *seen |= SEEN_BOGUS_UNIX_FROM;
 264                         return;
 265                 }
 266         }
 267         if (!memcmp("From:", line, 5) && isspace(line[5])) {
 268                 if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 269                         *seen |= SEEN_FROM;
 270                         return;
 271                 }
 272         }
 273         if (!memcmp("Date:", line, 5) && isspace(line[5])) {
 274                 if (!(*seen & SEEN_DATE)) {
 275                         handle_date(line+6);
 276                         *seen |= SEEN_DATE;
 277                         return;
 278                 }
 279         }
 280         if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
 281                 if (!(*seen & SEEN_SUBJECT)) {
 282                         handle_subject(line+9);
 283                         *seen |= SEEN_SUBJECT;
 284                         return;
 285                 }
 286         }
 287         if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
 288                 if (!(*seen & SEEN_SUBJECT)) {
 289                         handle_subject(line);
 290                         *seen |= SEEN_SUBJECT;
 291                         return;
 292                 }
 293         }
 294         *seen |= SEEN_PREFIX;
 295 }
 296
 297 static char *cleanup_subject(char *subject)
 298 {
 299         if (keep_subject)
 300                 return subject;
 301         for (;;) {
 302                 char *p;
 303                 int len, remove;
 304                 switch (*subject) {
 305                 case 'r': case 'R':
 306                         if (!memcmp("e:", subject+1, 2)) {
 307                                 subject +=3;
 308                                 continue;
 309                         }
 310                         break;
 311                 case ' ': case '\t': case ':':
 312                         subject++;
 313                         continue;
 314
 315                 case '[':
 316                         p = strchr(subject, ']');
 317                         if (!p) {
 318                                 subject++;
 319                                 continue;
 320                         }
 321                         len = strlen(p);
 322                         remove = p - subject;
 323                         if (remove <= len *2) {
 324                                 subject = p+1;
 325                                 continue;
 326                         }
 327                         break;
 328                 }
 329                 eatspace(subject);
 330                 return subject;
 331         }
 332 }
 333
 334 static void cleanup_space(char *buf)
 335 {
 336         unsigned char c;
 337         while ((c = *buf) != 0) {
 338                 buf++;
 339                 if (isspace(c)) {
 340                         buf[-1] = ' ';
 341                         c = *buf;
 342                         while (isspace(c)) {
 343                                 int len = strlen(buf);
 344                                 memmove(buf, buf+1, len);
 345                                 c = *buf;
 346                         }
 347                 }
 348         }
 349 }
 350
 351 static void decode_header_bq(char *it);
 352 typedef int (*header_fn_t)(char *);
 353 struct header_def {
 354         const char *name;
 355         header_fn_t func;
 356         int namelen;
 357 };
 358
 359 static void check_header(char *line, struct header_def *header)
 360 {
 361         int i;
 362
 363         if (header[0].namelen <= 0) {
 364                 for (i = 0; header[i].name; i++)
 365                         header[i].namelen = strlen(header[i].name);
 366         }
 367         for (i = 0; header[i].name; i++) {
 368                 int len = header[i].namelen;
 369                 if (!strncasecmp(line, header[i].name, len) &&
 370                     line[len] == ':' && isspace(line[len + 1])) {
 371                         /* Unwrap inline B and Q encoding, and optionally
 372                          * normalize the meta information to utf8.
 373                          */
 374                         decode_header_bq(line + len + 2);
 375                         header[i].func(line + len + 2);
 376                         break;
 377                 }
 378         }
 379 }
 380
 381 static void check_subheader_line(char *line)
 382 {
 383         static struct header_def header[] = {
 384                 { "Content-Type", handle_subcontent_type },
 385                 { "Content-Transfer-Encoding",
 386                   handle_content_transfer_encoding },
 387                 { NULL },
 388         };
 389         check_header(line, header);
 390 }
 391 static void check_header_line(char *line)
 392 {
 393         static struct header_def header[] = {
 394                 { "From", handle_from },
 395                 { "Date", handle_date },
 396                 { "Subject", handle_subject },
 397                 { "Content-Type", handle_content_type },
 398                 { "Content-Transfer-Encoding",
 399                   handle_content_transfer_encoding },
 400                 { NULL },
 401         };
 402         check_header(line, header);
 403 }
 404
 405 static int is_rfc2822_header(char *line)
 406 {
 407         /*
 408          * The section that defines the loosest possible
 409          * field name is "3.6.8 Optional fields".
 410          *
 411          * optional-field = field-name ":" unstructured CRLF
 412          * field-name = 1*ftext
 413          * ftext = %d33-57 / %59-126
 414          */
 415         int ch;
 416         char *cp = line;
 417         while ((ch = *cp++)) {
 418                 if (ch == ':')
 419                         return cp != line;
 420                 if ((33 <= ch && ch <= 57) ||
 421                     (59 <= ch && ch <= 126))
 422                         continue;
 423                 break;
 424         }
 425         return 0;
 426 }
 427
 428 static int read_one_header_line(char *line, int sz, FILE *in)
 429 {
 430         int ofs = 0;
 431         while (ofs < sz) {
 432                 int peek, len;
 433                 if (fgets(line + ofs, sz - ofs, in) == NULL)
 434                         break;
 435                 len = eatspace(line + ofs);
 436                 if ((len == 0) || !is_rfc2822_header(line)) {
 437                         /* Re-add the newline */
 438                         line[ofs + len] = '\n';
 439                         line[ofs + len + 1] = '\0';
 440                         break;
 441                 }
 442                 ofs += len;
 443                 /* Yuck, 2822 header "folding" */
 444                 peek = fgetc(in); ungetc(peek, in);
 445                 if (peek != ' ' && peek != '\t')
 446                         break;
 447         }
 448         /* Count mbox From headers as headers */
 449         if (!ofs && !memcmp(line, "From ", 5))
 450                 ofs = 1;
 451         return ofs;
 452 }
 453
 454 static unsigned hexval(int c)
 455 {
 456         if (c >= '0' && c <= '9')
 457                 return c - '0';
 458         if (c >= 'a' && c <= 'f')
 459                 return c - 'a' + 10;
 460         if (c >= 'A' && c <= 'F')
 461                 return c - 'A' + 10;
 462         return ~0;
 463 }
 464
 465 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 466 {
 467         int c;
 468         while ((c = *in++) != 0 && (in <= ep)) {
 469                 if (c == '=') {
 470                         int d = *in++;
 471                         if (d == '\n' || !d)
 472                                 break; /* drop trailing newline */
 473                         *ot++ = ((hexval(d) << 4) | hexval(*in++));
 474                         continue;
 475                 }
 476                 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
 477                         c = 0x20;
 478                 *ot++ = c;
 479         }
 480         *ot = 0;
 481         return 0;
 482 }
 483
 484 static int decode_b_segment(char *in, char *ot, char *ep)
 485 {
 486         /* Decode in..ep, possibly in-place to ot */
 487         int c, pos = 0, acc = 0;
 488
 489         while ((c = *in++) != 0 && (in <= ep)) {
 490                 if (c == '+')
 491                         c = 62;
 492                 else if (c == '/')
 493                         c = 63;
 494                 else if ('A' <= c && c <= 'Z')
 495                         c -= 'A';
 496                 else if ('a' <= c && c <= 'z')
 497                         c -= 'a' - 26;
 498                 else if ('0' <= c && c <= '9')
 499                         c -= '0' - 52;
 500                 else if (c == '=') {
 501                         /* padding is almost like (c == 0), except we do
 502                          * not output NUL resulting only from it;
 503                          * for now we just trust the data.
 504                          */
 505                         c = 0;
 506                 }
 507                 else
 508                         continue; /* garbage */
 509                 switch (pos++) {
 510                 case 0:
 511                         acc = (c << 2);
 512                         break;
 513                 case 1:
 514                         *ot++ = (acc | (c >> 4));
 515                         acc = (c & 15) << 4;
 516                         break;
 517                 case 2:
 518                         *ot++ = (acc | (c >> 2));
 519                         acc = (c & 3) << 6;
 520                         break;
 521                 case 3:
 522                         *ot++ = (acc | c);
 523                         acc = pos = 0;
 524                         break;
 525                 }
 526         }
 527         *ot = 0;
 528         return 0;
 529 }
 530
 531 static void convert_to_utf8(char *line, char *charset)
 532 {
 533 #ifndef NO_ICONV
 534         char *in, *out;
 535         size_t insize, outsize, nrc;
 536         char outbuf[4096]; /* cheat */
 537         static char latin_one[] = "latin1";
 538         char *input_charset = *charset ? charset : latin_one;
 539         iconv_t conv = iconv_open(metainfo_charset, input_charset);
 540
 541         if (conv == (iconv_t) -1) {
 542                 static int warned_latin1_once = 0;
 543                 if (input_charset != latin_one) {
 544                         fprintf(stderr, "cannot convert from %s to %s\n",
 545                                 input_charset, metainfo_charset);
 546                         *charset = 0;
 547                 }
 548                 else if (!warned_latin1_once) {
 549                         warned_latin1_once = 1;
 550                         fprintf(stderr, "tried to convert from %s to %s, "
 551                                 "but your iconv does not work with it.\n",
 552                                 input_charset, metainfo_charset);
 553                 }
 554                 return;
 555         }
 556         in = line;
 557         insize = strlen(in);
 558         out = outbuf;
 559         outsize = sizeof(outbuf);
 560         nrc = iconv(conv, &in, &insize, &out, &outsize);
 561         iconv_close(conv);
 562         if (nrc == (size_t) -1)
 563                 return;
 564         *out = 0;
 565         strcpy(line, outbuf);
 566 #endif
 567 }
 568
 569 static void decode_header_bq(char *it)
 570 {
 571         char *in, *out, *ep, *cp, *sp;
 572         char outbuf[1000];
 573
 574         in = it;
 575         out = outbuf;
 576         while ((ep = strstr(in, "=?")) != NULL) {
 577                 int sz, encoding;
 578                 char charset_q[256], piecebuf[256];
 579                 if (in != ep) {
 580                         sz = ep - in;
 581                         memcpy(out, in, sz);
 582                         out += sz;
 583                         in += sz;
 584                 }
 585                 /* E.g.
 586                  * ep : "=?iso-2022-jp?B?GyR...?= foo"
 587                  * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
 588                  */
 589                 ep += 2;
 590                 cp = strchr(ep, '?');
 591                 if (!cp)
 592                         return; /* no munging */
 593                 for (sp = ep; sp < cp; sp++)
 594                         charset_q[sp - ep] = tolower(*sp);
 595                 charset_q[cp - ep] = 0;
 596                 encoding = cp[1];
 597                 if (!encoding || cp[2] != '?')
 598                         return; /* no munging */
 599                 ep = strstr(cp + 3, "?=");
 600                 if (!ep)
 601                         return; /* no munging */
 602                 switch (tolower(encoding)) {
 603                 default:
 604                         return; /* no munging */
 605                 case 'b':
 606                         sz = decode_b_segment(cp + 3, piecebuf, ep);
 607                         break;
 608                 case 'q':
 609                         sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 610                         break;
 611                 }
 612                 if (sz < 0)
 613                         return;
 614                 if (metainfo_charset)
 615                         convert_to_utf8(piecebuf, charset_q);
 616                 strcpy(out, piecebuf);
 617                 out += strlen(out);
 618                 in = ep + 2;
 619         }
 620         strcpy(out, in);
 621         strcpy(it, outbuf);
 622 }
 623
 624 static void decode_transfer_encoding(char *line)
 625 {
 626         char *ep;
 627
 628         switch (transfer_encoding) {
 629         case TE_QP:
 630                 ep = line + strlen(line);
 631                 decode_q_segment(line, line, ep, 0);
 632                 break;
 633         case TE_BASE64:
 634                 ep = line + strlen(line);
 635                 decode_b_segment(line, line, ep);
 636                 break;
 637         case TE_DONTCARE:
 638                 break;
 639         }
 640 }
 641
 642 static void handle_info(void)
 643 {
 644         char *sub;
 645
 646         sub = cleanup_subject(subject);
 647         cleanup_space(name);
 648         cleanup_space(date);
 649         cleanup_space(email);
 650         cleanup_space(sub);
 651
 652         fprintf(fout, "Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
 653                name, email, sub, date);
 654 }
 655
 656 /* We are inside message body and have read line[] already.
 657  * Spit out the commit log.
 658  */
 659 static int handle_commit_msg(int *seen)
 660 {
 661         if (!cmitmsg)
 662                 return 0;
 663         do {
 664                 if (!memcmp("diff -", line, 6) ||
 665                     !memcmp("---", line, 3) ||
 666                     !memcmp("Index: ", line, 7))
 667                         break;
 668                 if ((multipart_boundary[0] && is_multipart_boundary(line))) {
 669                         /* We come here when the first part had only
 670                          * the commit message without any patch.  We
 671                          * pretend we have not seen this line yet, and
 672                          * go back to the loop.
 673                          */
 674                         return 1;
 675                 }
 676
 677                 /* Unwrap transfer encoding and optionally
 678                  * normalize the log message to UTF-8.
 679                  */
 680                 decode_transfer_encoding(line);
 681                 if (metainfo_charset)
 682                         convert_to_utf8(line, charset);
 683
 684                 handle_inbody_header(seen, line);
 685                 if (!(*seen & SEEN_PREFIX))
 686                         continue;
 687
 688                 fputs(line, cmitmsg);
 689         } while (fgets(line, sizeof(line), fin) != NULL);
 690         fclose(cmitmsg);
 691         cmitmsg = NULL;
 692         return 0;
 693 }
 694
 695 /* We have done the commit message and have the first
 696  * line of the patch in line[].
 697  */
 698 static void handle_patch(void)
 699 {
 700         do {
 701                 if (multipart_boundary[0] && is_multipart_boundary(line))
 702                         break;
 703                 /* Only unwrap transfer encoding but otherwise do not
 704                  * do anything.  We do *NOT* want UTF-8 conversion
 705                  * here; we are dealing with the user payload.
 706                  */
 707                 decode_transfer_encoding(line);
 708                 fputs(line, patchfile);
 709                 patch_lines++;
 710         } while (fgets(line, sizeof(line), fin) != NULL);
 711 }
 712
 713 /* multipart boundary and transfer encoding are set up for us, and we
 714  * are at the end of the sub header.  do equivalent of handle_body up
 715  * to the next boundary without closing patchfile --- we will expect
 716  * that the first part to contain commit message and a patch, and
 717  * handle other parts as pure patches.
 718  */
 719 static int handle_multipart_one_part(int *seen)
 720 {
 721         int n = 0;
 722
 723         while (fgets(line, sizeof(line), fin) != NULL) {
 724         again:
 725                 n++;
 726                 if (is_multipart_boundary(line))
 727                         break;
 728                 if (handle_commit_msg(seen))
 729                         goto again;
 730                 handle_patch();
 731                 break;
 732         }
 733         if (n == 0)
 734                 return -1;
 735         return 0;
 736 }
 737
 738 static void handle_multipart_body(void)
 739 {
 740         int seen = 0;
 741         int part_num = 0;
 742
 743         /* Skip up to the first boundary */
 744         while (fgets(line, sizeof(line), fin) != NULL)
 745                 if (is_multipart_boundary(line)) {
 746                         part_num = 1;
 747                         break;
 748                 }
 749         if (!part_num)
 750                 return;
 751         /* We are on boundary line.  Start slurping the subhead. */
 752         while (1) {
 753                 int hdr = read_one_header_line(line, sizeof(line), fin);
 754                 if (!hdr) {
 755                         if (handle_multipart_one_part(&seen) < 0)
 756                                 return;
 757                         /* Reset per part headers */
 758                         transfer_encoding = TE_DONTCARE;
 759                         charset[0] = 0;
 760                 }
 761                 else
 762                         check_subheader_line(line);
 763         }
 764         fclose(patchfile);
 765         if (!patch_lines) {
 766                 fprintf(stderr, "No patch found\n");
 767                 exit(1);
 768         }
 769 }
 770
 771 /* Non multipart message */
 772 static void handle_body(void)
 773 {
 774         int seen = 0;
 775
 776         handle_commit_msg(&seen);
 777         handle_patch();
 778         fclose(patchfile);
 779         if (!patch_lines) {
 780                 fprintf(stderr, "No patch found\n");
 781                 exit(1);
 782         }
 783 }
 784
 785 int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
 786              const char *msg, const char *patch)
 787 {
 788         keep_subject = ks;
 789         metainfo_charset = encoding;
 790         fin = in;
 791         fout = out;
 792
 793         cmitmsg = fopen(msg, "w");
 794         if (!cmitmsg) {
 795                 perror(msg);
 796                 return -1;
 797         }
 798         patchfile = fopen(patch, "w");
 799         if (!patchfile) {
 800                 perror(patch);
 801                 fclose(cmitmsg);
 802                 return -1;
 803         }
 804         while (1) {
 805                 int hdr = read_one_header_line(line, sizeof(line), fin);
 806                 if (!hdr) {
 807                         if (multipart_boundary[0])
 808                                 handle_multipart_body();
 809                         else
 810                                 handle_body();
 811                         handle_info();
 812                         break;
 813                 }
 814                 check_header_line(line);
 815         }
 816
 817         return 0;
 818 }
 819
 820 static const char mailinfo_usage[] =
 821         "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
 822
 823 int cmd_mailinfo(int argc, const char **argv, char **envp)
 824 {
 825         /* NEEDSWORK: might want to do the optional .git/ directory
 826          * discovery
 827          */
 828         git_config(git_default_config);
 829
 830         while (1 < argc && argv[1][0] == '-') {
 831                 if (!strcmp(argv[1], "-k"))
 832                         keep_subject = 1;
 833                 else if (!strcmp(argv[1], "-u"))
 834                         metainfo_charset = git_commit_encoding;
 835                 else if (!strncmp(argv[1], "--encoding=", 11))
 836                         metainfo_charset = argv[1] + 11;
 837                 else
 838                         usage(mailinfo_usage);
 839                 argc--; argv++;
 840         }
 841
 842         if (argc != 3)
 843                 usage(mailinfo_usage);
 844
 845         return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
 846 }