mailinfo: re-fix MIME multipart boundary parsing
[git/git.git] / 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 #include "cache.h"
6 #include "builtin.h"
7 #include "utf8.h"
8 #include "strbuf.h"
9
10 static FILE *cmitmsg, *patchfile, *fin, *fout;
11
12 static int keep_subject;
13 static const char *metainfo_charset;
14 static struct strbuf line = STRBUF_INIT;
15 static struct strbuf name = STRBUF_INIT;
16 static struct strbuf email = STRBUF_INIT;
17
18 static enum {
19 TE_DONTCARE, TE_QP, TE_BASE64,
20 } transfer_encoding;
21 static enum {
22 TYPE_TEXT, TYPE_OTHER,
23 } message_type;
24
25 static struct strbuf charset = STRBUF_INIT;
26 static int patch_lines;
27 static struct strbuf **p_hdr_data, **s_hdr_data;
28
29 #define MAX_HDR_PARSED 10
30 #define MAX_BOUNDARIES 5
31
32 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
33 {
34 struct strbuf *src = name;
35 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
36 strchr(name->buf, '<') || strchr(name->buf, '>'))
37 src = email;
38 else if (name == out)
39 return;
40 strbuf_reset(out);
41 strbuf_addbuf(out, src);
42 }
43
44 static void parse_bogus_from(const struct strbuf *line)
45 {
46 /* John Doe <johndoe> */
47
48 char *bra, *ket;
49 /* This is fallback, so do not bother if we already have an
50 * e-mail address.
51 */
52 if (email.len)
53 return;
54
55 bra = strchr(line->buf, '<');
56 if (!bra)
57 return;
58 ket = strchr(bra, '>');
59 if (!ket)
60 return;
61
62 strbuf_reset(&email);
63 strbuf_add(&email, bra + 1, ket - bra - 1);
64
65 strbuf_reset(&name);
66 strbuf_add(&name, line->buf, bra - line->buf);
67 strbuf_trim(&name);
68 get_sane_name(&name, &name, &email);
69 }
70
71 static void handle_from(const struct strbuf *from)
72 {
73 char *at;
74 size_t el;
75 struct strbuf f;
76
77 strbuf_init(&f, from->len);
78 strbuf_addbuf(&f, from);
79
80 at = strchr(f.buf, '@');
81 if (!at) {
82 parse_bogus_from(from);
83 return;
84 }
85
86 /*
87 * If we already have one email, don't take any confusing lines
88 */
89 if (email.len && strchr(at + 1, '@')) {
90 strbuf_release(&f);
91 return;
92 }
93
94 /* Pick up the string around '@', possibly delimited with <>
95 * pair; that is the email part.
96 */
97 while (at > f.buf) {
98 char c = at[-1];
99 if (isspace(c))
100 break;
101 if (c == '<') {
102 at[-1] = ' ';
103 break;
104 }
105 at--;
106 }
107 el = strcspn(at, " \n\t\r\v\f>");
108 strbuf_reset(&email);
109 strbuf_add(&email, at, el);
110 strbuf_remove(&f, at - f.buf, el + 1);
111
112 /* The remainder is name. It could be "John Doe <john.doe@xz>"
113 * or "john.doe@xz (John Doe)", but we have removed the
114 * email part, so trim from both ends, possibly removing
115 * the () pair at the end.
116 */
117 strbuf_trim(&f);
118 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
119 strbuf_remove(&f, 0, 1);
120 strbuf_setlen(&f, f.len - 1);
121 }
122
123 get_sane_name(&name, &f, &email);
124 strbuf_release(&f);
125 }
126
127 static void handle_header(struct strbuf **out, const struct strbuf *line)
128 {
129 if (!*out) {
130 *out = xmalloc(sizeof(struct strbuf));
131 strbuf_init(*out, line->len);
132 } else
133 strbuf_reset(*out);
134
135 strbuf_addbuf(*out, line);
136 }
137
138 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
139 * to have enough heuristics to grok MIME encoded patches often found
140 * on our mailing lists. For example, we do not even treat header lines
141 * case insensitively.
142 */
143
144 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
145 {
146 const char *ends, *ap = strcasestr(line, name);
147 size_t sz;
148
149 if (!ap) {
150 strbuf_setlen(attr, 0);
151 return 0;
152 }
153 ap += strlen(name);
154 if (*ap == '"') {
155 ap++;
156 ends = "\"";
157 }
158 else
159 ends = "; \t";
160 sz = strcspn(ap, ends);
161 strbuf_add(attr, ap, sz);
162 return 1;
163 }
164
165 static struct strbuf *content[MAX_BOUNDARIES];
166
167 static struct strbuf **content_top = content;
168
169 static void handle_content_type(struct strbuf *line)
170 {
171 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
172 strbuf_init(boundary, line->len);
173
174 if (!strcasestr(line->buf, "text/"))
175 message_type = TYPE_OTHER;
176 if (slurp_attr(line->buf, "boundary=", boundary)) {
177 strbuf_insert(boundary, 0, "--", 2);
178 if (++content_top > &content[MAX_BOUNDARIES]) {
179 fprintf(stderr, "Too many boundaries to handle\n");
180 exit(1);
181 }
182 *content_top = boundary;
183 boundary = NULL;
184 }
185 if (slurp_attr(line->buf, "charset=", &charset))
186 strbuf_tolower(&charset);
187
188 if (boundary) {
189 strbuf_release(boundary);
190 free(boundary);
191 }
192 }
193
194 static void handle_content_transfer_encoding(const struct strbuf *line)
195 {
196 if (strcasestr(line->buf, "base64"))
197 transfer_encoding = TE_BASE64;
198 else if (strcasestr(line->buf, "quoted-printable"))
199 transfer_encoding = TE_QP;
200 else
201 transfer_encoding = TE_DONTCARE;
202 }
203
204 static int is_multipart_boundary(const struct strbuf *line)
205 {
206 return (((*content_top)->len <= line->len) &&
207 !memcmp(line->buf, (*content_top)->buf, (*content_top)->len));
208 }
209
210 static void cleanup_subject(struct strbuf *subject)
211 {
212 char *pos;
213 size_t remove;
214 while (subject->len) {
215 switch (*subject->buf) {
216 case 'r': case 'R':
217 if (subject->len <= 3)
218 break;
219 if (!memcmp(subject->buf + 1, "e:", 2)) {
220 strbuf_remove(subject, 0, 3);
221 continue;
222 }
223 break;
224 case ' ': case '\t': case ':':
225 strbuf_remove(subject, 0, 1);
226 continue;
227 case '[':
228 if ((pos = strchr(subject->buf, ']'))) {
229 remove = pos - subject->buf;
230 if (remove <= (subject->len - remove) * 2) {
231 strbuf_remove(subject, 0, remove + 1);
232 continue;
233 }
234 } else
235 strbuf_remove(subject, 0, 1);
236 break;
237 }
238 strbuf_trim(subject);
239 return;
240 }
241 }
242
243 static void cleanup_space(struct strbuf *sb)
244 {
245 size_t pos, cnt;
246 for (pos = 0; pos < sb->len; pos++) {
247 if (isspace(sb->buf[pos])) {
248 sb->buf[pos] = ' ';
249 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
250 strbuf_remove(sb, pos + 1, cnt);
251 }
252 }
253 }
254
255 static void decode_header(struct strbuf *line);
256 static const char *header[MAX_HDR_PARSED] = {
257 "From","Subject","Date",
258 };
259
260 static 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
267 static int check_header(const struct strbuf *line,
268 struct strbuf *hdr_data[], int overwrite)
269 {
270 int i, ret = 0, len;
271 struct strbuf sb = STRBUF_INIT;
272 /* search for the interesting parts */
273 for (i = 0; header[i]; i++) {
274 int len = strlen(header[i]);
275 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
276 /* Unwrap inline B and Q encoding, and optionally
277 * normalize the meta information to utf8.
278 */
279 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
280 decode_header(&sb);
281 handle_header(&hdr_data[i], &sb);
282 ret = 1;
283 goto check_header_out;
284 }
285 }
286
287 /* Content stuff */
288 if (cmp_header(line, "Content-Type")) {
289 len = strlen("Content-Type: ");
290 strbuf_add(&sb, line->buf + len, line->len - len);
291 decode_header(&sb);
292 strbuf_insert(&sb, 0, "Content-Type: ", len);
293 handle_content_type(&sb);
294 ret = 1;
295 goto check_header_out;
296 }
297 if (cmp_header(line, "Content-Transfer-Encoding")) {
298 len = strlen("Content-Transfer-Encoding: ");
299 strbuf_add(&sb, line->buf + len, line->len - len);
300 decode_header(&sb);
301 handle_content_transfer_encoding(&sb);
302 ret = 1;
303 goto check_header_out;
304 }
305
306 /* for inbody stuff */
307 if (!prefixcmp(line->buf, ">From") && isspace(line->buf[5])) {
308 ret = 1; /* Should this return 0? */
309 goto check_header_out;
310 }
311 if (!prefixcmp(line->buf, "[PATCH]") && isspace(line->buf[7])) {
312 for (i = 0; header[i]; i++) {
313 if (!memcmp("Subject", header[i], 7)) {
314 handle_header(&hdr_data[i], line);
315 ret = 1;
316 goto check_header_out;
317 }
318 }
319 }
320
321 check_header_out:
322 strbuf_release(&sb);
323 return ret;
324 }
325
326 static int is_rfc2822_header(const struct strbuf *line)
327 {
328 /*
329 * The section that defines the loosest possible
330 * field name is "3.6.8 Optional fields".
331 *
332 * optional-field = field-name ":" unstructured CRLF
333 * field-name = 1*ftext
334 * ftext = %d33-57 / %59-126
335 */
336 int ch;
337 char *cp = line->buf;
338
339 /* Count mbox From headers as headers */
340 if (!prefixcmp(cp, "From ") || !prefixcmp(cp, ">From "))
341 return 1;
342
343 while ((ch = *cp++)) {
344 if (ch == ':')
345 return 1;
346 if ((33 <= ch && ch <= 57) ||
347 (59 <= ch && ch <= 126))
348 continue;
349 break;
350 }
351 return 0;
352 }
353
354 static int read_one_header_line(struct strbuf *line, FILE *in)
355 {
356 /* Get the first part of the line. */
357 if (strbuf_getline(line, in, '\n'))
358 return 0;
359
360 /*
361 * Is it an empty line or not a valid rfc2822 header?
362 * If so, stop here, and return false ("not a header")
363 */
364 strbuf_rtrim(line);
365 if (!line->len || !is_rfc2822_header(line)) {
366 /* Re-add the newline */
367 strbuf_addch(line, '\n');
368 return 0;
369 }
370
371 /*
372 * Now we need to eat all the continuation lines..
373 * Yuck, 2822 header "folding"
374 */
375 for (;;) {
376 int peek;
377 struct strbuf continuation = STRBUF_INIT;
378
379 peek = fgetc(in); ungetc(peek, in);
380 if (peek != ' ' && peek != '\t')
381 break;
382 if (strbuf_getline(&continuation, in, '\n'))
383 break;
384 continuation.buf[0] = '\n';
385 strbuf_rtrim(&continuation);
386 strbuf_addbuf(line, &continuation);
387 }
388
389 return 1;
390 }
391
392 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
393 {
394 const char *in = q_seg->buf;
395 int c;
396 struct strbuf *out = xmalloc(sizeof(struct strbuf));
397 strbuf_init(out, q_seg->len);
398
399 while ((c = *in++) != 0) {
400 if (c == '=') {
401 int d = *in++;
402 if (d == '\n' || !d)
403 break; /* drop trailing newline */
404 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
405 continue;
406 }
407 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
408 c = 0x20;
409 strbuf_addch(out, c);
410 }
411 return out;
412 }
413
414 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
415 {
416 /* Decode in..ep, possibly in-place to ot */
417 int c, pos = 0, acc = 0;
418 const char *in = b_seg->buf;
419 struct strbuf *out = xmalloc(sizeof(struct strbuf));
420 strbuf_init(out, b_seg->len);
421
422 while ((c = *in++) != 0) {
423 if (c == '+')
424 c = 62;
425 else if (c == '/')
426 c = 63;
427 else if ('A' <= c && c <= 'Z')
428 c -= 'A';
429 else if ('a' <= c && c <= 'z')
430 c -= 'a' - 26;
431 else if ('0' <= c && c <= '9')
432 c -= '0' - 52;
433 else if (c == '=') {
434 /* padding is almost like (c == 0), except we do
435 * not output NUL resulting only from it;
436 * for now we just trust the data.
437 */
438 c = 0;
439 }
440 else
441 continue; /* garbage */
442 switch (pos++) {
443 case 0:
444 acc = (c << 2);
445 break;
446 case 1:
447 strbuf_addch(out, (acc | (c >> 4)));
448 acc = (c & 15) << 4;
449 break;
450 case 2:
451 strbuf_addch(out, (acc | (c >> 2)));
452 acc = (c & 3) << 6;
453 break;
454 case 3:
455 strbuf_addch(out, (acc | c));
456 acc = pos = 0;
457 break;
458 }
459 }
460 return out;
461 }
462
463 /*
464 * When there is no known charset, guess.
465 *
466 * Right now we assume that if the target is UTF-8 (the default),
467 * and it already looks like UTF-8 (which includes US-ASCII as its
468 * subset, of course) then that is what it is and there is nothing
469 * to do.
470 *
471 * Otherwise, we default to assuming it is Latin1 for historical
472 * reasons.
473 */
474 static const char *guess_charset(const struct strbuf *line, const char *target_charset)
475 {
476 if (is_encoding_utf8(target_charset)) {
477 if (is_utf8(line->buf))
478 return NULL;
479 }
480 return "latin1";
481 }
482
483 static void convert_to_utf8(struct strbuf *line, const char *charset)
484 {
485 char *out;
486
487 if (!charset || !*charset) {
488 charset = guess_charset(line, metainfo_charset);
489 if (!charset)
490 return;
491 }
492
493 if (!strcmp(metainfo_charset, charset))
494 return;
495 out = reencode_string(line->buf, metainfo_charset, charset);
496 if (!out)
497 die("cannot convert from %s to %s\n",
498 charset, metainfo_charset);
499 strbuf_attach(line, out, strlen(out), strlen(out));
500 }
501
502 static int decode_header_bq(struct strbuf *it)
503 {
504 char *in, *ep, *cp;
505 struct strbuf outbuf = STRBUF_INIT, *dec;
506 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
507 int rfc2047 = 0;
508
509 in = it->buf;
510 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
511 int encoding;
512 strbuf_reset(&charset_q);
513 strbuf_reset(&piecebuf);
514 rfc2047 = 1;
515
516 if (in != ep) {
517 strbuf_add(&outbuf, in, ep - in);
518 in = ep;
519 }
520 /* E.g.
521 * ep : "=?iso-2022-jp?B?GyR...?= foo"
522 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
523 */
524 ep += 2;
525
526 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
527 goto decode_header_bq_out;
528
529 if (cp + 3 - it->buf > it->len)
530 goto decode_header_bq_out;
531 strbuf_add(&charset_q, ep, cp - ep);
532 strbuf_tolower(&charset_q);
533
534 encoding = cp[1];
535 if (!encoding || cp[2] != '?')
536 goto decode_header_bq_out;
537 ep = strstr(cp + 3, "?=");
538 if (!ep)
539 goto decode_header_bq_out;
540 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
541 switch (tolower(encoding)) {
542 default:
543 goto decode_header_bq_out;
544 case 'b':
545 dec = decode_b_segment(&piecebuf);
546 break;
547 case 'q':
548 dec = decode_q_segment(&piecebuf, 1);
549 break;
550 }
551 if (metainfo_charset)
552 convert_to_utf8(dec, charset_q.buf);
553
554 strbuf_addbuf(&outbuf, dec);
555 strbuf_release(dec);
556 free(dec);
557 in = ep + 2;
558 }
559 strbuf_addstr(&outbuf, in);
560 strbuf_reset(it);
561 strbuf_addbuf(it, &outbuf);
562 decode_header_bq_out:
563 strbuf_release(&outbuf);
564 strbuf_release(&charset_q);
565 strbuf_release(&piecebuf);
566 return rfc2047;
567 }
568
569 static void decode_header(struct strbuf *it)
570 {
571 if (decode_header_bq(it))
572 return;
573 /* otherwise "it" is a straight copy of the input.
574 * This can be binary guck but there is no charset specified.
575 */
576 if (metainfo_charset)
577 convert_to_utf8(it, "");
578 }
579
580 static void decode_transfer_encoding(struct strbuf *line)
581 {
582 struct strbuf *ret;
583
584 switch (transfer_encoding) {
585 case TE_QP:
586 ret = decode_q_segment(line, 0);
587 break;
588 case TE_BASE64:
589 ret = decode_b_segment(line);
590 break;
591 case TE_DONTCARE:
592 default:
593 return;
594 }
595 strbuf_reset(line);
596 strbuf_addbuf(line, ret);
597 strbuf_release(ret);
598 free(ret);
599 }
600
601 static void handle_filter(struct strbuf *line);
602
603 static int find_boundary(void)
604 {
605 while (!strbuf_getline(&line, fin, '\n')) {
606 if (*content_top && is_multipart_boundary(&line))
607 return 1;
608 }
609 return 0;
610 }
611
612 static int handle_boundary(void)
613 {
614 struct strbuf newline = STRBUF_INIT;
615
616 strbuf_addch(&newline, '\n');
617 again:
618 if (line.len >= (*content_top)->len + 2 &&
619 !memcmp(line.buf + (*content_top)->len, "--", 2)) {
620 /* we hit an end boundary */
621 /* pop the current boundary off the stack */
622 strbuf_release(*content_top);
623 free(*content_top);
624 *content_top = NULL;
625
626 /* technically won't happen as is_multipart_boundary()
627 will fail first. But just in case..
628 */
629 if (--content_top < content) {
630 fprintf(stderr, "Detected mismatched boundaries, "
631 "can't recover\n");
632 exit(1);
633 }
634 handle_filter(&newline);
635 strbuf_release(&newline);
636
637 /* skip to the next boundary */
638 if (!find_boundary())
639 return 0;
640 goto again;
641 }
642
643 /* set some defaults */
644 transfer_encoding = TE_DONTCARE;
645 strbuf_reset(&charset);
646 message_type = TYPE_TEXT;
647
648 /* slurp in this section's info */
649 while (read_one_header_line(&line, fin))
650 check_header(&line, p_hdr_data, 0);
651
652 strbuf_release(&newline);
653 /* replenish line */
654 if (strbuf_getline(&line, fin, '\n'))
655 return 0;
656 strbuf_addch(&line, '\n');
657 return 1;
658 }
659
660 static inline int patchbreak(const struct strbuf *line)
661 {
662 size_t i;
663
664 /* Beginning of a "diff -" header? */
665 if (!prefixcmp(line->buf, "diff -"))
666 return 1;
667
668 /* CVS "Index: " line? */
669 if (!prefixcmp(line->buf, "Index: "))
670 return 1;
671
672 /*
673 * "--- <filename>" starts patches without headers
674 * "---<sp>*" is a manual separator
675 */
676 if (line->len < 4)
677 return 0;
678
679 if (!prefixcmp(line->buf, "---")) {
680 /* space followed by a filename? */
681 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
682 return 1;
683 /* Just whitespace? */
684 for (i = 3; i < line->len; i++) {
685 unsigned char c = line->buf[i];
686 if (c == '\n')
687 return 1;
688 if (!isspace(c))
689 break;
690 }
691 return 0;
692 }
693 return 0;
694 }
695
696 static int handle_commit_msg(struct strbuf *line)
697 {
698 static int still_looking = 1;
699
700 if (!cmitmsg)
701 return 0;
702
703 if (still_looking) {
704 strbuf_ltrim(line);
705 if (!line->len)
706 return 0;
707 if ((still_looking = check_header(line, s_hdr_data, 0)) != 0)
708 return 0;
709 }
710
711 /* normalize the log message to UTF-8. */
712 if (metainfo_charset)
713 convert_to_utf8(line, charset.buf);
714
715 if (patchbreak(line)) {
716 fclose(cmitmsg);
717 cmitmsg = NULL;
718 return 1;
719 }
720
721 fputs(line->buf, cmitmsg);
722 return 0;
723 }
724
725 static void handle_patch(const struct strbuf *line)
726 {
727 fwrite(line->buf, 1, line->len, patchfile);
728 patch_lines++;
729 }
730
731 static void handle_filter(struct strbuf *line)
732 {
733 static int filter = 0;
734
735 /* filter tells us which part we left off on */
736 switch (filter) {
737 case 0:
738 if (!handle_commit_msg(line))
739 break;
740 filter++;
741 case 1:
742 handle_patch(line);
743 break;
744 }
745 }
746
747 static void handle_body(void)
748 {
749 int len = 0;
750 struct strbuf prev = STRBUF_INIT;
751
752 /* Skip up to the first boundary */
753 if (*content_top) {
754 if (!find_boundary())
755 goto handle_body_out;
756 }
757
758 do {
759 strbuf_setlen(&line, line.len + len);
760
761 /* process any boundary lines */
762 if (*content_top && is_multipart_boundary(&line)) {
763 /* flush any leftover */
764 if (prev.len) {
765 handle_filter(&prev);
766 strbuf_reset(&prev);
767 }
768 if (!handle_boundary())
769 goto handle_body_out;
770 }
771
772 /* Unwrap transfer encoding */
773 decode_transfer_encoding(&line);
774
775 switch (transfer_encoding) {
776 case TE_BASE64:
777 case TE_QP:
778 {
779 struct strbuf **lines, **it, *sb;
780
781 /* Prepend any previous partial lines */
782 strbuf_insert(&line, 0, prev.buf, prev.len);
783 strbuf_reset(&prev);
784
785 /* binary data most likely doesn't have newlines */
786 if (message_type != TYPE_TEXT) {
787 handle_filter(&line);
788 break;
789 }
790 /*
791 * This is a decoded line that may contain
792 * multiple new lines. Pass only one chunk
793 * at a time to handle_filter()
794 */
795 lines = strbuf_split(&line, '\n');
796 for (it = lines; (sb = *it); it++) {
797 if (*(it + 1) == NULL) /* The last line */
798 if (sb->buf[sb->len - 1] != '\n') {
799 /* Partial line, save it for later. */
800 strbuf_addbuf(&prev, sb);
801 break;
802 }
803 handle_filter(sb);
804 }
805 /*
806 * The partial chunk is saved in "prev" and will be
807 * appended by the next iteration of read_line_with_nul().
808 */
809 strbuf_list_free(lines);
810 break;
811 }
812 default:
813 handle_filter(&line);
814 }
815
816 strbuf_reset(&line);
817 if (strbuf_avail(&line) < 100)
818 strbuf_grow(&line, 100);
819 } while ((len = read_line_with_nul(line.buf, strbuf_avail(&line), fin)));
820
821 handle_body_out:
822 strbuf_release(&prev);
823 }
824
825 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
826 {
827 const char *sp = data->buf;
828 while (1) {
829 char *ep = strchr(sp, '\n');
830 int len;
831 if (!ep)
832 len = strlen(sp);
833 else
834 len = ep - sp;
835 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
836 if (!ep)
837 break;
838 sp = ep + 1;
839 }
840 }
841
842 static void handle_info(void)
843 {
844 struct strbuf *hdr;
845 int i;
846
847 for (i = 0; header[i]; i++) {
848 /* only print inbody headers if we output a patch file */
849 if (patch_lines && s_hdr_data[i])
850 hdr = s_hdr_data[i];
851 else if (p_hdr_data[i])
852 hdr = p_hdr_data[i];
853 else
854 continue;
855
856 if (!memcmp(header[i], "Subject", 7)) {
857 if (!keep_subject) {
858 cleanup_subject(hdr);
859 cleanup_space(hdr);
860 }
861 output_header_lines(fout, "Subject", hdr);
862 } else if (!memcmp(header[i], "From", 4)) {
863 handle_from(hdr);
864 fprintf(fout, "Author: %s\n", name.buf);
865 fprintf(fout, "Email: %s\n", email.buf);
866 } else {
867 cleanup_space(hdr);
868 fprintf(fout, "%s: %s\n", header[i], hdr->buf);
869 }
870 }
871 fprintf(fout, "\n");
872 }
873
874 static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
875 const char *msg, const char *patch)
876 {
877 int peek;
878 keep_subject = ks;
879 metainfo_charset = encoding;
880 fin = in;
881 fout = out;
882
883 cmitmsg = fopen(msg, "w");
884 if (!cmitmsg) {
885 perror(msg);
886 return -1;
887 }
888 patchfile = fopen(patch, "w");
889 if (!patchfile) {
890 perror(patch);
891 fclose(cmitmsg);
892 return -1;
893 }
894
895 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));
896 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));
897
898 do {
899 peek = fgetc(in);
900 } while (isspace(peek));
901 ungetc(peek, in);
902
903 /* process the email header */
904 while (read_one_header_line(&line, fin))
905 check_header(&line, p_hdr_data, 1);
906
907 handle_body();
908 handle_info();
909
910 return 0;
911 }
912
913 static const char mailinfo_usage[] =
914 "git mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info";
915
916 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
917 {
918 const char *def_charset;
919
920 /* NEEDSWORK: might want to do the optional .git/ directory
921 * discovery
922 */
923 git_config(git_default_config, NULL);
924
925 def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
926 metainfo_charset = def_charset;
927
928 while (1 < argc && argv[1][0] == '-') {
929 if (!strcmp(argv[1], "-k"))
930 keep_subject = 1;
931 else if (!strcmp(argv[1], "-u"))
932 metainfo_charset = def_charset;
933 else if (!strcmp(argv[1], "-n"))
934 metainfo_charset = NULL;
935 else if (!prefixcmp(argv[1], "--encoding="))
936 metainfo_charset = argv[1] + 11;
937 else
938 usage(mailinfo_usage);
939 argc--; argv++;
940 }
941
942 if (argc != 3)
943 usage(mailinfo_usage);
944
945 return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
946 }