Merge branch 'js/diff-notice-has-drive-prefix' into maint
[git/git.git] / mailinfo.c
1 #include "cache.h"
2 #include "config.h"
3 #include "utf8.h"
4 #include "strbuf.h"
5 #include "mailinfo.h"
6
7 static void cleanup_space(struct strbuf *sb)
8 {
9 size_t pos, cnt;
10 for (pos = 0; pos < sb->len; pos++) {
11 if (isspace(sb->buf[pos])) {
12 sb->buf[pos] = ' ';
13 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
14 strbuf_remove(sb, pos + 1, cnt);
15 }
16 }
17 }
18
19 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
20 {
21 struct strbuf *src = name;
22 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
23 strchr(name->buf, '<') || strchr(name->buf, '>'))
24 src = email;
25 else if (name == out)
26 return;
27 strbuf_reset(out);
28 strbuf_addbuf(out, src);
29 }
30
31 static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
32 {
33 /* John Doe <johndoe> */
34
35 char *bra, *ket;
36 /* This is fallback, so do not bother if we already have an
37 * e-mail address.
38 */
39 if (mi->email.len)
40 return;
41
42 bra = strchr(line->buf, '<');
43 if (!bra)
44 return;
45 ket = strchr(bra, '>');
46 if (!ket)
47 return;
48
49 strbuf_reset(&mi->email);
50 strbuf_add(&mi->email, bra + 1, ket - bra - 1);
51
52 strbuf_reset(&mi->name);
53 strbuf_add(&mi->name, line->buf, bra - line->buf);
54 strbuf_trim(&mi->name);
55 get_sane_name(&mi->name, &mi->name, &mi->email);
56 }
57
58 static const char *unquote_comment(struct strbuf *outbuf, const char *in)
59 {
60 int c;
61 int take_next_literally = 0;
62
63 strbuf_addch(outbuf, '(');
64
65 while ((c = *in++) != 0) {
66 if (take_next_literally == 1) {
67 take_next_literally = 0;
68 } else {
69 switch (c) {
70 case '\\':
71 take_next_literally = 1;
72 continue;
73 case '(':
74 in = unquote_comment(outbuf, in);
75 continue;
76 case ')':
77 strbuf_addch(outbuf, ')');
78 return in;
79 }
80 }
81
82 strbuf_addch(outbuf, c);
83 }
84
85 return in;
86 }
87
88 static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
89 {
90 int c;
91 int take_next_literally = 0;
92
93 while ((c = *in++) != 0) {
94 if (take_next_literally == 1) {
95 take_next_literally = 0;
96 } else {
97 switch (c) {
98 case '\\':
99 take_next_literally = 1;
100 continue;
101 case '"':
102 return in;
103 }
104 }
105
106 strbuf_addch(outbuf, c);
107 }
108
109 return in;
110 }
111
112 static void unquote_quoted_pair(struct strbuf *line)
113 {
114 struct strbuf outbuf;
115 const char *in = line->buf;
116 int c;
117
118 strbuf_init(&outbuf, line->len);
119
120 while ((c = *in++) != 0) {
121 switch (c) {
122 case '"':
123 in = unquote_quoted_string(&outbuf, in);
124 continue;
125 case '(':
126 in = unquote_comment(&outbuf, in);
127 continue;
128 }
129
130 strbuf_addch(&outbuf, c);
131 }
132
133 strbuf_swap(&outbuf, line);
134 strbuf_release(&outbuf);
135
136 }
137
138 static void handle_from(struct mailinfo *mi, const struct strbuf *from)
139 {
140 char *at;
141 size_t el;
142 struct strbuf f;
143
144 strbuf_init(&f, from->len);
145 strbuf_addbuf(&f, from);
146
147 unquote_quoted_pair(&f);
148
149 at = strchr(f.buf, '@');
150 if (!at) {
151 parse_bogus_from(mi, from);
152 goto out;
153 }
154
155 /*
156 * If we already have one email, don't take any confusing lines
157 */
158 if (mi->email.len && strchr(at + 1, '@'))
159 goto out;
160
161 /* Pick up the string around '@', possibly delimited with <>
162 * pair; that is the email part.
163 */
164 while (at > f.buf) {
165 char c = at[-1];
166 if (isspace(c))
167 break;
168 if (c == '<') {
169 at[-1] = ' ';
170 break;
171 }
172 at--;
173 }
174 el = strcspn(at, " \n\t\r\v\f>");
175 strbuf_reset(&mi->email);
176 strbuf_add(&mi->email, at, el);
177 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
178
179 /* The remainder is name. It could be
180 *
181 * - "John Doe <john.doe@xz>" (a), or
182 * - "john.doe@xz (John Doe)" (b), or
183 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
184 *
185 * but we have removed the email part, so
186 *
187 * - remove extra spaces which could stay after email (case 'c'), and
188 * - trim from both ends, possibly removing the () pair at the end
189 * (cases 'a' and 'b').
190 */
191 cleanup_space(&f);
192 strbuf_trim(&f);
193 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
194 strbuf_remove(&f, 0, 1);
195 strbuf_setlen(&f, f.len - 1);
196 }
197
198 get_sane_name(&mi->name, &f, &mi->email);
199 out:
200 strbuf_release(&f);
201 }
202
203 static void handle_header(struct strbuf **out, const struct strbuf *line)
204 {
205 if (!*out) {
206 *out = xmalloc(sizeof(struct strbuf));
207 strbuf_init(*out, line->len);
208 } else
209 strbuf_reset(*out);
210
211 strbuf_addbuf(*out, line);
212 }
213
214 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
215 * to have enough heuristics to grok MIME encoded patches often found
216 * on our mailing lists. For example, we do not even treat header lines
217 * case insensitively.
218 */
219
220 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
221 {
222 const char *ends, *ap = strcasestr(line, name);
223 size_t sz;
224
225 strbuf_setlen(attr, 0);
226 if (!ap)
227 return 0;
228 ap += strlen(name);
229 if (*ap == '"') {
230 ap++;
231 ends = "\"";
232 }
233 else
234 ends = "; \t";
235 sz = strcspn(ap, ends);
236 strbuf_add(attr, ap, sz);
237 return 1;
238 }
239
240 static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
241 {
242 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
243 strbuf_init(boundary, line->len);
244
245 if (slurp_attr(line->buf, "boundary=", boundary)) {
246 strbuf_insert(boundary, 0, "--", 2);
247 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
248 error("Too many boundaries to handle");
249 mi->input_error = -1;
250 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
251 return;
252 }
253 *(mi->content_top) = boundary;
254 boundary = NULL;
255 }
256 slurp_attr(line->buf, "charset=", &mi->charset);
257
258 if (boundary) {
259 strbuf_release(boundary);
260 free(boundary);
261 }
262 }
263
264 static void handle_content_transfer_encoding(struct mailinfo *mi,
265 const struct strbuf *line)
266 {
267 if (strcasestr(line->buf, "base64"))
268 mi->transfer_encoding = TE_BASE64;
269 else if (strcasestr(line->buf, "quoted-printable"))
270 mi->transfer_encoding = TE_QP;
271 else
272 mi->transfer_encoding = TE_DONTCARE;
273 }
274
275 static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
276 {
277 struct strbuf *content_top = *(mi->content_top);
278
279 return ((content_top->len <= line->len) &&
280 !memcmp(line->buf, content_top->buf, content_top->len));
281 }
282
283 static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
284 {
285 size_t at = 0;
286
287 while (at < subject->len) {
288 char *pos;
289 size_t remove;
290
291 switch (subject->buf[at]) {
292 case 'r': case 'R':
293 if (subject->len <= at + 3)
294 break;
295 if ((subject->buf[at + 1] == 'e' ||
296 subject->buf[at + 1] == 'E') &&
297 subject->buf[at + 2] == ':') {
298 strbuf_remove(subject, at, 3);
299 continue;
300 }
301 at++;
302 break;
303 case ' ': case '\t': case ':':
304 strbuf_remove(subject, at, 1);
305 continue;
306 case '[':
307 pos = strchr(subject->buf + at, ']');
308 if (!pos)
309 break;
310 remove = pos - subject->buf + at + 1;
311 if (!mi->keep_non_patch_brackets_in_subject ||
312 (7 <= remove &&
313 memmem(subject->buf + at, remove, "PATCH", 5)))
314 strbuf_remove(subject, at, remove);
315 else {
316 at += remove;
317 /*
318 * If the input had a space after the ], keep
319 * it. We don't bother with finding the end of
320 * the space, since we later normalize it
321 * anyway.
322 */
323 if (isspace(subject->buf[at]))
324 at += 1;
325 }
326 continue;
327 }
328 break;
329 }
330 strbuf_trim(subject);
331 }
332
333 #define MAX_HDR_PARSED 10
334 static const char *header[MAX_HDR_PARSED] = {
335 "From","Subject","Date",
336 };
337
338 static inline int cmp_header(const struct strbuf *line, const char *hdr)
339 {
340 int len = strlen(hdr);
341 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
342 line->buf[len] == ':' && isspace(line->buf[len + 1]);
343 }
344
345 static int is_format_patch_separator(const char *line, int len)
346 {
347 static const char SAMPLE[] =
348 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
349 const char *cp;
350
351 if (len != strlen(SAMPLE))
352 return 0;
353 if (!skip_prefix(line, "From ", &cp))
354 return 0;
355 if (strspn(cp, "0123456789abcdef") != 40)
356 return 0;
357 cp += 40;
358 return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
359 }
360
361 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
362 {
363 const char *in = q_seg->buf;
364 int c;
365 struct strbuf *out = xmalloc(sizeof(struct strbuf));
366 strbuf_init(out, q_seg->len);
367
368 while ((c = *in++) != 0) {
369 if (c == '=') {
370 int ch, d = *in;
371 if (d == '\n' || !d)
372 break; /* drop trailing newline */
373 ch = hex2chr(in);
374 if (ch >= 0) {
375 strbuf_addch(out, ch);
376 in += 2;
377 continue;
378 }
379 /* garbage -- fall through */
380 }
381 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
382 c = 0x20;
383 strbuf_addch(out, c);
384 }
385 return out;
386 }
387
388 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
389 {
390 /* Decode in..ep, possibly in-place to ot */
391 int c, pos = 0, acc = 0;
392 const char *in = b_seg->buf;
393 struct strbuf *out = xmalloc(sizeof(struct strbuf));
394 strbuf_init(out, b_seg->len);
395
396 while ((c = *in++) != 0) {
397 if (c == '+')
398 c = 62;
399 else if (c == '/')
400 c = 63;
401 else if ('A' <= c && c <= 'Z')
402 c -= 'A';
403 else if ('a' <= c && c <= 'z')
404 c -= 'a' - 26;
405 else if ('0' <= c && c <= '9')
406 c -= '0' - 52;
407 else
408 continue; /* garbage */
409 switch (pos++) {
410 case 0:
411 acc = (c << 2);
412 break;
413 case 1:
414 strbuf_addch(out, (acc | (c >> 4)));
415 acc = (c & 15) << 4;
416 break;
417 case 2:
418 strbuf_addch(out, (acc | (c >> 2)));
419 acc = (c & 3) << 6;
420 break;
421 case 3:
422 strbuf_addch(out, (acc | c));
423 acc = pos = 0;
424 break;
425 }
426 }
427 return out;
428 }
429
430 static int convert_to_utf8(struct mailinfo *mi,
431 struct strbuf *line, const char *charset)
432 {
433 char *out;
434
435 if (!mi->metainfo_charset || !charset || !*charset)
436 return 0;
437
438 if (same_encoding(mi->metainfo_charset, charset))
439 return 0;
440 out = reencode_string(line->buf, mi->metainfo_charset, charset);
441 if (!out) {
442 mi->input_error = -1;
443 return error("cannot convert from %s to %s",
444 charset, mi->metainfo_charset);
445 }
446 strbuf_attach(line, out, strlen(out), strlen(out));
447 return 0;
448 }
449
450 static void decode_header(struct mailinfo *mi, struct strbuf *it)
451 {
452 char *in, *ep, *cp;
453 struct strbuf outbuf = STRBUF_INIT, *dec;
454 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
455 int found_error = 1; /* pessimism */
456
457 in = it->buf;
458 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
459 int encoding;
460 strbuf_reset(&charset_q);
461 strbuf_reset(&piecebuf);
462
463 if (in != ep) {
464 /*
465 * We are about to process an encoded-word
466 * that begins at ep, but there is something
467 * before the encoded word.
468 */
469 char *scan;
470 for (scan = in; scan < ep; scan++)
471 if (!isspace(*scan))
472 break;
473
474 if (scan != ep || in == it->buf) {
475 /*
476 * We should not lose that "something",
477 * unless we have just processed an
478 * encoded-word, and there is only LWS
479 * before the one we are about to process.
480 */
481 strbuf_add(&outbuf, in, ep - in);
482 }
483 }
484 /* E.g.
485 * ep : "=?iso-2022-jp?B?GyR...?= foo"
486 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
487 */
488 ep += 2;
489
490 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
491 goto release_return;
492
493 if (cp + 3 - it->buf > it->len)
494 goto release_return;
495 strbuf_add(&charset_q, ep, cp - ep);
496
497 encoding = cp[1];
498 if (!encoding || cp[2] != '?')
499 goto release_return;
500 ep = strstr(cp + 3, "?=");
501 if (!ep)
502 goto release_return;
503 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
504 switch (tolower(encoding)) {
505 default:
506 goto release_return;
507 case 'b':
508 dec = decode_b_segment(&piecebuf);
509 break;
510 case 'q':
511 dec = decode_q_segment(&piecebuf, 1);
512 break;
513 }
514 if (convert_to_utf8(mi, dec, charset_q.buf))
515 goto release_return;
516
517 strbuf_addbuf(&outbuf, dec);
518 strbuf_release(dec);
519 free(dec);
520 in = ep + 2;
521 }
522 strbuf_addstr(&outbuf, in);
523 strbuf_reset(it);
524 strbuf_addbuf(it, &outbuf);
525 found_error = 0;
526 release_return:
527 strbuf_release(&outbuf);
528 strbuf_release(&charset_q);
529 strbuf_release(&piecebuf);
530
531 if (found_error)
532 mi->input_error = -1;
533 }
534
535 static int check_header(struct mailinfo *mi,
536 const struct strbuf *line,
537 struct strbuf *hdr_data[], int overwrite)
538 {
539 int i, ret = 0, len;
540 struct strbuf sb = STRBUF_INIT;
541
542 /* search for the interesting parts */
543 for (i = 0; header[i]; i++) {
544 int len = strlen(header[i]);
545 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
546 /* Unwrap inline B and Q encoding, and optionally
547 * normalize the meta information to utf8.
548 */
549 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
550 decode_header(mi, &sb);
551 handle_header(&hdr_data[i], &sb);
552 ret = 1;
553 goto check_header_out;
554 }
555 }
556
557 /* Content stuff */
558 if (cmp_header(line, "Content-Type")) {
559 len = strlen("Content-Type: ");
560 strbuf_add(&sb, line->buf + len, line->len - len);
561 decode_header(mi, &sb);
562 strbuf_insert(&sb, 0, "Content-Type: ", len);
563 handle_content_type(mi, &sb);
564 ret = 1;
565 goto check_header_out;
566 }
567 if (cmp_header(line, "Content-Transfer-Encoding")) {
568 len = strlen("Content-Transfer-Encoding: ");
569 strbuf_add(&sb, line->buf + len, line->len - len);
570 decode_header(mi, &sb);
571 handle_content_transfer_encoding(mi, &sb);
572 ret = 1;
573 goto check_header_out;
574 }
575 if (cmp_header(line, "Message-Id")) {
576 len = strlen("Message-Id: ");
577 strbuf_add(&sb, line->buf + len, line->len - len);
578 decode_header(mi, &sb);
579 if (mi->add_message_id)
580 mi->message_id = strbuf_detach(&sb, NULL);
581 ret = 1;
582 goto check_header_out;
583 }
584
585 check_header_out:
586 strbuf_release(&sb);
587 return ret;
588 }
589
590 /*
591 * Returns 1 if the given line or any line beginning with the given line is an
592 * in-body header (that is, check_header will succeed when passed
593 * mi->s_hdr_data).
594 */
595 static int is_inbody_header(const struct mailinfo *mi,
596 const struct strbuf *line)
597 {
598 int i;
599 for (i = 0; header[i]; i++)
600 if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
601 return 1;
602 return 0;
603 }
604
605 static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
606 {
607 struct strbuf *ret;
608
609 switch (mi->transfer_encoding) {
610 case TE_QP:
611 ret = decode_q_segment(line, 0);
612 break;
613 case TE_BASE64:
614 ret = decode_b_segment(line);
615 break;
616 case TE_DONTCARE:
617 default:
618 return;
619 }
620 strbuf_reset(line);
621 strbuf_addbuf(line, ret);
622 strbuf_release(ret);
623 free(ret);
624 }
625
626 static inline int patchbreak(const struct strbuf *line)
627 {
628 size_t i;
629
630 /* Beginning of a "diff -" header? */
631 if (starts_with(line->buf, "diff -"))
632 return 1;
633
634 /* CVS "Index: " line? */
635 if (starts_with(line->buf, "Index: "))
636 return 1;
637
638 /*
639 * "--- <filename>" starts patches without headers
640 * "---<sp>*" is a manual separator
641 */
642 if (line->len < 4)
643 return 0;
644
645 if (starts_with(line->buf, "---")) {
646 /* space followed by a filename? */
647 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
648 return 1;
649 /* Just whitespace? */
650 for (i = 3; i < line->len; i++) {
651 unsigned char c = line->buf[i];
652 if (c == '\n')
653 return 1;
654 if (!isspace(c))
655 break;
656 }
657 return 0;
658 }
659 return 0;
660 }
661
662 static int is_scissors_line(const char *line)
663 {
664 const char *c;
665 int scissors = 0, gap = 0;
666 const char *first_nonblank = NULL, *last_nonblank = NULL;
667 int visible, perforation = 0, in_perforation = 0;
668
669 for (c = line; *c; c++) {
670 if (isspace(*c)) {
671 if (in_perforation) {
672 perforation++;
673 gap++;
674 }
675 continue;
676 }
677 last_nonblank = c;
678 if (first_nonblank == NULL)
679 first_nonblank = c;
680 if (*c == '-') {
681 in_perforation = 1;
682 perforation++;
683 continue;
684 }
685 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
686 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
687 in_perforation = 1;
688 perforation += 2;
689 scissors += 2;
690 c++;
691 continue;
692 }
693 in_perforation = 0;
694 }
695
696 /*
697 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
698 * Even though there can be arbitrary cruft on the same line
699 * (e.g. "cut here"), in order to avoid misidentification, the
700 * perforation must occupy more than a third of the visible
701 * width of the line, and dashes and scissors must occupy more
702 * than half of the perforation.
703 */
704
705 if (first_nonblank && last_nonblank)
706 visible = last_nonblank - first_nonblank + 1;
707 else
708 visible = 0;
709 return (scissors && 8 <= visible &&
710 visible < perforation * 3 &&
711 gap * 2 < perforation);
712 }
713
714 static void flush_inbody_header_accum(struct mailinfo *mi)
715 {
716 if (!mi->inbody_header_accum.len)
717 return;
718 if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
719 BUG("inbody_header_accum, if not empty, must always contain a valid in-body header");
720 strbuf_reset(&mi->inbody_header_accum);
721 }
722
723 static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
724 {
725 if (mi->inbody_header_accum.len &&
726 (line->buf[0] == ' ' || line->buf[0] == '\t')) {
727 if (mi->use_scissors && is_scissors_line(line->buf)) {
728 /*
729 * This is a scissors line; do not consider this line
730 * as a header continuation line.
731 */
732 flush_inbody_header_accum(mi);
733 return 0;
734 }
735 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
736 strbuf_addbuf(&mi->inbody_header_accum, line);
737 return 1;
738 }
739
740 flush_inbody_header_accum(mi);
741
742 if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
743 return is_format_patch_separator(line->buf + 1, line->len - 1);
744 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
745 int i;
746 for (i = 0; header[i]; i++)
747 if (!strcmp("Subject", header[i])) {
748 handle_header(&mi->s_hdr_data[i], line);
749 return 1;
750 }
751 return 0;
752 }
753 if (is_inbody_header(mi, line)) {
754 strbuf_addbuf(&mi->inbody_header_accum, line);
755 return 1;
756 }
757 return 0;
758 }
759
760 static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
761 {
762 assert(!mi->filter_stage);
763
764 if (mi->header_stage) {
765 if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
766 if (mi->inbody_header_accum.len) {
767 flush_inbody_header_accum(mi);
768 mi->header_stage = 0;
769 }
770 return 0;
771 }
772 }
773
774 if (mi->use_inbody_headers && mi->header_stage) {
775 mi->header_stage = check_inbody_header(mi, line);
776 if (mi->header_stage)
777 return 0;
778 } else
779 /* Only trim the first (blank) line of the commit message
780 * when ignoring in-body headers.
781 */
782 mi->header_stage = 0;
783
784 /* normalize the log message to UTF-8. */
785 if (convert_to_utf8(mi, line, mi->charset.buf))
786 return 0; /* mi->input_error already set */
787
788 if (mi->use_scissors && is_scissors_line(line->buf)) {
789 int i;
790
791 strbuf_setlen(&mi->log_message, 0);
792 mi->header_stage = 1;
793
794 /*
795 * We may have already read "secondary headers"; purge
796 * them to give ourselves a clean restart.
797 */
798 for (i = 0; header[i]; i++) {
799 if (mi->s_hdr_data[i])
800 strbuf_release(mi->s_hdr_data[i]);
801 mi->s_hdr_data[i] = NULL;
802 }
803 return 0;
804 }
805
806 if (patchbreak(line)) {
807 if (mi->message_id)
808 strbuf_addf(&mi->log_message,
809 "Message-Id: %s\n", mi->message_id);
810 return 1;
811 }
812
813 strbuf_addbuf(&mi->log_message, line);
814 return 0;
815 }
816
817 static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
818 {
819 fwrite(line->buf, 1, line->len, mi->patchfile);
820 mi->patch_lines++;
821 }
822
823 static void handle_filter(struct mailinfo *mi, struct strbuf *line)
824 {
825 switch (mi->filter_stage) {
826 case 0:
827 if (!handle_commit_msg(mi, line))
828 break;
829 mi->filter_stage++;
830 /* fallthrough */
831 case 1:
832 handle_patch(mi, line);
833 break;
834 }
835 }
836
837 static int is_rfc2822_header(const struct strbuf *line)
838 {
839 /*
840 * The section that defines the loosest possible
841 * field name is "3.6.8 Optional fields".
842 *
843 * optional-field = field-name ":" unstructured CRLF
844 * field-name = 1*ftext
845 * ftext = %d33-57 / %59-126
846 */
847 int ch;
848 char *cp = line->buf;
849
850 /* Count mbox From headers as headers */
851 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
852 return 1;
853
854 while ((ch = *cp++)) {
855 if (ch == ':')
856 return 1;
857 if ((33 <= ch && ch <= 57) ||
858 (59 <= ch && ch <= 126))
859 continue;
860 break;
861 }
862 return 0;
863 }
864
865 static int read_one_header_line(struct strbuf *line, FILE *in)
866 {
867 struct strbuf continuation = STRBUF_INIT;
868
869 /* Get the first part of the line. */
870 if (strbuf_getline_lf(line, in))
871 return 0;
872
873 /*
874 * Is it an empty line or not a valid rfc2822 header?
875 * If so, stop here, and return false ("not a header")
876 */
877 strbuf_rtrim(line);
878 if (!line->len || !is_rfc2822_header(line)) {
879 /* Re-add the newline */
880 strbuf_addch(line, '\n');
881 return 0;
882 }
883
884 /*
885 * Now we need to eat all the continuation lines..
886 * Yuck, 2822 header "folding"
887 */
888 for (;;) {
889 int peek;
890
891 peek = fgetc(in);
892 if (peek == EOF)
893 break;
894 ungetc(peek, in);
895 if (peek != ' ' && peek != '\t')
896 break;
897 if (strbuf_getline_lf(&continuation, in))
898 break;
899 continuation.buf[0] = ' ';
900 strbuf_rtrim(&continuation);
901 strbuf_addbuf(line, &continuation);
902 }
903 strbuf_release(&continuation);
904
905 return 1;
906 }
907
908 static int find_boundary(struct mailinfo *mi, struct strbuf *line)
909 {
910 while (!strbuf_getline_lf(line, mi->input)) {
911 if (*(mi->content_top) && is_multipart_boundary(mi, line))
912 return 1;
913 }
914 return 0;
915 }
916
917 static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
918 {
919 struct strbuf newline = STRBUF_INIT;
920
921 strbuf_addch(&newline, '\n');
922 again:
923 if (line->len >= (*(mi->content_top))->len + 2 &&
924 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
925 /* we hit an end boundary */
926 /* pop the current boundary off the stack */
927 strbuf_release(*(mi->content_top));
928 FREE_AND_NULL(*(mi->content_top));
929
930 /* technically won't happen as is_multipart_boundary()
931 will fail first. But just in case..
932 */
933 if (--mi->content_top < mi->content) {
934 error("Detected mismatched boundaries, can't recover");
935 mi->input_error = -1;
936 mi->content_top = mi->content;
937 strbuf_release(&newline);
938 return 0;
939 }
940 handle_filter(mi, &newline);
941 strbuf_release(&newline);
942 if (mi->input_error)
943 return 0;
944
945 /* skip to the next boundary */
946 if (!find_boundary(mi, line))
947 return 0;
948 goto again;
949 }
950
951 /* set some defaults */
952 mi->transfer_encoding = TE_DONTCARE;
953 strbuf_reset(&mi->charset);
954
955 /* slurp in this section's info */
956 while (read_one_header_line(line, mi->input))
957 check_header(mi, line, mi->p_hdr_data, 0);
958
959 strbuf_release(&newline);
960 /* replenish line */
961 if (strbuf_getline_lf(line, mi->input))
962 return 0;
963 strbuf_addch(line, '\n');
964 return 1;
965 }
966
967 static void handle_body(struct mailinfo *mi, struct strbuf *line)
968 {
969 struct strbuf prev = STRBUF_INIT;
970
971 /* Skip up to the first boundary */
972 if (*(mi->content_top)) {
973 if (!find_boundary(mi, line))
974 goto handle_body_out;
975 }
976
977 do {
978 /* process any boundary lines */
979 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
980 /* flush any leftover */
981 if (prev.len) {
982 handle_filter(mi, &prev);
983 strbuf_reset(&prev);
984 }
985 if (!handle_boundary(mi, line))
986 goto handle_body_out;
987 }
988
989 /* Unwrap transfer encoding */
990 decode_transfer_encoding(mi, line);
991
992 switch (mi->transfer_encoding) {
993 case TE_BASE64:
994 case TE_QP:
995 {
996 struct strbuf **lines, **it, *sb;
997
998 /* Prepend any previous partial lines */
999 strbuf_insert(line, 0, prev.buf, prev.len);
1000 strbuf_reset(&prev);
1001
1002 /*
1003 * This is a decoded line that may contain
1004 * multiple new lines. Pass only one chunk
1005 * at a time to handle_filter()
1006 */
1007 lines = strbuf_split(line, '\n');
1008 for (it = lines; (sb = *it); it++) {
1009 if (*(it + 1) == NULL) /* The last line */
1010 if (sb->buf[sb->len - 1] != '\n') {
1011 /* Partial line, save it for later. */
1012 strbuf_addbuf(&prev, sb);
1013 break;
1014 }
1015 handle_filter(mi, sb);
1016 }
1017 /*
1018 * The partial chunk is saved in "prev" and will be
1019 * appended by the next iteration of read_line_with_nul().
1020 */
1021 strbuf_list_free(lines);
1022 break;
1023 }
1024 default:
1025 handle_filter(mi, line);
1026 }
1027
1028 if (mi->input_error)
1029 break;
1030 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1031
1032 flush_inbody_header_accum(mi);
1033
1034 handle_body_out:
1035 strbuf_release(&prev);
1036 }
1037
1038 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1039 {
1040 const char *sp = data->buf;
1041 while (1) {
1042 char *ep = strchr(sp, '\n');
1043 int len;
1044 if (!ep)
1045 len = strlen(sp);
1046 else
1047 len = ep - sp;
1048 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1049 if (!ep)
1050 break;
1051 sp = ep + 1;
1052 }
1053 }
1054
1055 static void handle_info(struct mailinfo *mi)
1056 {
1057 struct strbuf *hdr;
1058 int i;
1059
1060 for (i = 0; header[i]; i++) {
1061 /* only print inbody headers if we output a patch file */
1062 if (mi->patch_lines && mi->s_hdr_data[i])
1063 hdr = mi->s_hdr_data[i];
1064 else if (mi->p_hdr_data[i])
1065 hdr = mi->p_hdr_data[i];
1066 else
1067 continue;
1068
1069 if (!strcmp(header[i], "Subject")) {
1070 if (!mi->keep_subject) {
1071 cleanup_subject(mi, hdr);
1072 cleanup_space(hdr);
1073 }
1074 output_header_lines(mi->output, "Subject", hdr);
1075 } else if (!strcmp(header[i], "From")) {
1076 cleanup_space(hdr);
1077 handle_from(mi, hdr);
1078 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1079 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1080 } else {
1081 cleanup_space(hdr);
1082 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1083 }
1084 }
1085 fprintf(mi->output, "\n");
1086 }
1087
1088 int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1089 {
1090 FILE *cmitmsg;
1091 int peek;
1092 struct strbuf line = STRBUF_INIT;
1093
1094 cmitmsg = fopen(msg, "w");
1095 if (!cmitmsg) {
1096 perror(msg);
1097 return -1;
1098 }
1099 mi->patchfile = fopen(patch, "w");
1100 if (!mi->patchfile) {
1101 perror(patch);
1102 fclose(cmitmsg);
1103 return -1;
1104 }
1105
1106 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1107 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1108
1109 do {
1110 peek = fgetc(mi->input);
1111 if (peek == EOF) {
1112 fclose(cmitmsg);
1113 return error("empty patch: '%s'", patch);
1114 }
1115 } while (isspace(peek));
1116 ungetc(peek, mi->input);
1117
1118 /* process the email header */
1119 while (read_one_header_line(&line, mi->input))
1120 check_header(mi, &line, mi->p_hdr_data, 1);
1121
1122 handle_body(mi, &line);
1123 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1124 fclose(cmitmsg);
1125 fclose(mi->patchfile);
1126
1127 handle_info(mi);
1128 strbuf_release(&line);
1129 return mi->input_error;
1130 }
1131
1132 static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1133 {
1134 struct mailinfo *mi = mi_;
1135
1136 if (!starts_with(var, "mailinfo."))
1137 return git_default_config(var, value, NULL);
1138 if (!strcmp(var, "mailinfo.scissors")) {
1139 mi->use_scissors = git_config_bool(var, value);
1140 return 0;
1141 }
1142 /* perhaps others here */
1143 return 0;
1144 }
1145
1146 void setup_mailinfo(struct mailinfo *mi)
1147 {
1148 memset(mi, 0, sizeof(*mi));
1149 strbuf_init(&mi->name, 0);
1150 strbuf_init(&mi->email, 0);
1151 strbuf_init(&mi->charset, 0);
1152 strbuf_init(&mi->log_message, 0);
1153 strbuf_init(&mi->inbody_header_accum, 0);
1154 mi->header_stage = 1;
1155 mi->use_inbody_headers = 1;
1156 mi->content_top = mi->content;
1157 git_config(git_mailinfo_config, mi);
1158 }
1159
1160 void clear_mailinfo(struct mailinfo *mi)
1161 {
1162 int i;
1163
1164 strbuf_release(&mi->name);
1165 strbuf_release(&mi->email);
1166 strbuf_release(&mi->charset);
1167 strbuf_release(&mi->inbody_header_accum);
1168 free(mi->message_id);
1169
1170 if (mi->p_hdr_data)
1171 for (i = 0; mi->p_hdr_data[i]; i++)
1172 strbuf_release(mi->p_hdr_data[i]);
1173 free(mi->p_hdr_data);
1174 if (mi->s_hdr_data)
1175 for (i = 0; mi->s_hdr_data[i]; i++)
1176 strbuf_release(mi->s_hdr_data[i]);
1177 free(mi->s_hdr_data);
1178
1179 while (mi->content < mi->content_top) {
1180 free(*(mi->content_top));
1181 mi->content_top--;
1182 }
1183
1184 strbuf_release(&mi->log_message);
1185 }