status: close file descriptor after reading git-rebase-todo
[git/git.git] / mailinfo.c
CommitLineData
c6905e45
JH
1#include "cache.h"
2#include "utf8.h"
3#include "strbuf.h"
4#include "mailinfo.h"
5
6static void cleanup_space(struct strbuf *sb)
7{
8 size_t pos, cnt;
9 for (pos = 0; pos < sb->len; pos++) {
10 if (isspace(sb->buf[pos])) {
11 sb->buf[pos] = ' ';
12 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
13 strbuf_remove(sb, pos + 1, cnt);
14 }
15 }
16}
17
18static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
19{
20 struct strbuf *src = name;
21 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
22 strchr(name->buf, '<') || strchr(name->buf, '>'))
23 src = email;
24 else if (name == out)
25 return;
26 strbuf_reset(out);
27 strbuf_addbuf(out, src);
28}
29
30static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
31{
32 /* John Doe <johndoe> */
33
34 char *bra, *ket;
35 /* This is fallback, so do not bother if we already have an
36 * e-mail address.
37 */
38 if (mi->email.len)
39 return;
40
41 bra = strchr(line->buf, '<');
42 if (!bra)
43 return;
44 ket = strchr(bra, '>');
45 if (!ket)
46 return;
47
48 strbuf_reset(&mi->email);
49 strbuf_add(&mi->email, bra + 1, ket - bra - 1);
50
51 strbuf_reset(&mi->name);
52 strbuf_add(&mi->name, line->buf, bra - line->buf);
53 strbuf_trim(&mi->name);
54 get_sane_name(&mi->name, &mi->name, &mi->email);
55}
56
f357e5de
KD
57static const char *unquote_comment(struct strbuf *outbuf, const char *in)
58{
59 int c;
60 int take_next_litterally = 0;
61
62 strbuf_addch(outbuf, '(');
63
64 while ((c = *in++) != 0) {
65 if (take_next_litterally == 1) {
66 take_next_litterally = 0;
67 } else {
68 switch (c) {
69 case '\\':
70 take_next_litterally = 1;
71 continue;
72 case '(':
73 in = unquote_comment(outbuf, in);
74 continue;
75 case ')':
76 strbuf_addch(outbuf, ')');
77 return in;
78 }
79 }
80
81 strbuf_addch(outbuf, c);
82 }
83
84 return in;
85}
86
87static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
88{
89 int c;
90 int take_next_litterally = 0;
91
92 while ((c = *in++) != 0) {
93 if (take_next_litterally == 1) {
94 take_next_litterally = 0;
95 } else {
96 switch (c) {
97 case '\\':
98 take_next_litterally = 1;
99 continue;
100 case '"':
101 return in;
102 }
103 }
104
105 strbuf_addch(outbuf, c);
106 }
107
108 return in;
109}
110
111static void unquote_quoted_pair(struct strbuf *line)
112{
113 struct strbuf outbuf;
114 const char *in = line->buf;
115 int c;
116
117 strbuf_init(&outbuf, line->len);
118
119 while ((c = *in++) != 0) {
120 switch (c) {
121 case '"':
122 in = unquote_quoted_string(&outbuf, in);
123 continue;
124 case '(':
125 in = unquote_comment(&outbuf, in);
126 continue;
127 }
128
129 strbuf_addch(&outbuf, c);
130 }
131
132 strbuf_swap(&outbuf, line);
133 strbuf_release(&outbuf);
134
135}
136
c6905e45
JH
137static void handle_from(struct mailinfo *mi, const struct strbuf *from)
138{
139 char *at;
140 size_t el;
141 struct strbuf f;
142
143 strbuf_init(&f, from->len);
144 strbuf_addbuf(&f, from);
145
f357e5de
KD
146 unquote_quoted_pair(&f);
147
c6905e45
JH
148 at = strchr(f.buf, '@');
149 if (!at) {
150 parse_bogus_from(mi, from);
151 return;
152 }
153
154 /*
155 * If we already have one email, don't take any confusing lines
156 */
157 if (mi->email.len && strchr(at + 1, '@')) {
158 strbuf_release(&f);
159 return;
160 }
161
162 /* Pick up the string around '@', possibly delimited with <>
163 * pair; that is the email part.
164 */
165 while (at > f.buf) {
166 char c = at[-1];
167 if (isspace(c))
168 break;
169 if (c == '<') {
170 at[-1] = ' ';
171 break;
172 }
173 at--;
174 }
175 el = strcspn(at, " \n\t\r\v\f>");
176 strbuf_reset(&mi->email);
177 strbuf_add(&mi->email, at, el);
178 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
179
180 /* The remainder is name. It could be
181 *
182 * - "John Doe <john.doe@xz>" (a), or
183 * - "john.doe@xz (John Doe)" (b), or
184 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
185 *
186 * but we have removed the email part, so
187 *
188 * - remove extra spaces which could stay after email (case 'c'), and
189 * - trim from both ends, possibly removing the () pair at the end
190 * (cases 'a' and 'b').
191 */
192 cleanup_space(&f);
193 strbuf_trim(&f);
194 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
195 strbuf_remove(&f, 0, 1);
196 strbuf_setlen(&f, f.len - 1);
197 }
198
199 get_sane_name(&mi->name, &f, &mi->email);
200 strbuf_release(&f);
201}
202
203static 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
220static 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
240static 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]) {
6ac617a3
JH
248 error("Too many boundaries to handle");
249 mi->input_error = -1;
250 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
251 return;
c6905e45
JH
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
c6905e45
JH
264static 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
275static 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
283static 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
334static const char *header[MAX_HDR_PARSED] = {
335 "From","Subject","Date",
336};
337
338static 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
345static 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
361static 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 d = *in++;
371 if (d == '\n' || !d)
372 break; /* drop trailing newline */
373 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
374 continue;
375 }
376 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
377 c = 0x20;
378 strbuf_addch(out, c);
379 }
380 return out;
381}
382
383static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
384{
385 /* Decode in..ep, possibly in-place to ot */
386 int c, pos = 0, acc = 0;
387 const char *in = b_seg->buf;
388 struct strbuf *out = xmalloc(sizeof(struct strbuf));
389 strbuf_init(out, b_seg->len);
390
391 while ((c = *in++) != 0) {
392 if (c == '+')
393 c = 62;
394 else if (c == '/')
395 c = 63;
396 else if ('A' <= c && c <= 'Z')
397 c -= 'A';
398 else if ('a' <= c && c <= 'z')
399 c -= 'a' - 26;
400 else if ('0' <= c && c <= '9')
401 c -= '0' - 52;
402 else
403 continue; /* garbage */
404 switch (pos++) {
405 case 0:
406 acc = (c << 2);
407 break;
408 case 1:
409 strbuf_addch(out, (acc | (c >> 4)));
410 acc = (c & 15) << 4;
411 break;
412 case 2:
413 strbuf_addch(out, (acc | (c >> 2)));
414 acc = (c & 3) << 6;
415 break;
416 case 3:
417 strbuf_addch(out, (acc | c));
418 acc = pos = 0;
419 break;
420 }
421 }
422 return out;
423}
424
669b963a
JH
425static int convert_to_utf8(struct mailinfo *mi,
426 struct strbuf *line, const char *charset)
c6905e45
JH
427{
428 char *out;
429
430 if (!mi->metainfo_charset || !charset || !*charset)
669b963a 431 return 0;
c6905e45
JH
432
433 if (same_encoding(mi->metainfo_charset, charset))
669b963a 434 return 0;
c6905e45 435 out = reencode_string(line->buf, mi->metainfo_charset, charset);
6ac617a3
JH
436 if (!out) {
437 mi->input_error = -1;
669b963a
JH
438 return error("cannot convert from %s to %s",
439 charset, mi->metainfo_charset);
6ac617a3 440 }
c6905e45 441 strbuf_attach(line, out, strlen(out), strlen(out));
669b963a 442 return 0;
c6905e45
JH
443}
444
445static void decode_header(struct mailinfo *mi, struct strbuf *it)
446{
447 char *in, *ep, *cp;
448 struct strbuf outbuf = STRBUF_INIT, *dec;
449 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
6ac617a3 450 int found_error = 1; /* pessimism */
c6905e45
JH
451
452 in = it->buf;
453 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
454 int encoding;
455 strbuf_reset(&charset_q);
456 strbuf_reset(&piecebuf);
457
458 if (in != ep) {
459 /*
460 * We are about to process an encoded-word
461 * that begins at ep, but there is something
462 * before the encoded word.
463 */
464 char *scan;
465 for (scan = in; scan < ep; scan++)
466 if (!isspace(*scan))
467 break;
468
469 if (scan != ep || in == it->buf) {
470 /*
471 * We should not lose that "something",
472 * unless we have just processed an
473 * encoded-word, and there is only LWS
474 * before the one we are about to process.
475 */
476 strbuf_add(&outbuf, in, ep - in);
477 }
478 }
479 /* E.g.
480 * ep : "=?iso-2022-jp?B?GyR...?= foo"
481 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
482 */
483 ep += 2;
484
485 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
486 goto release_return;
487
488 if (cp + 3 - it->buf > it->len)
489 goto release_return;
490 strbuf_add(&charset_q, ep, cp - ep);
491
492 encoding = cp[1];
493 if (!encoding || cp[2] != '?')
494 goto release_return;
495 ep = strstr(cp + 3, "?=");
496 if (!ep)
497 goto release_return;
498 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
499 switch (tolower(encoding)) {
500 default:
501 goto release_return;
502 case 'b':
503 dec = decode_b_segment(&piecebuf);
504 break;
505 case 'q':
506 dec = decode_q_segment(&piecebuf, 1);
507 break;
508 }
669b963a
JH
509 if (convert_to_utf8(mi, dec, charset_q.buf))
510 goto release_return;
c6905e45
JH
511
512 strbuf_addbuf(&outbuf, dec);
513 strbuf_release(dec);
514 free(dec);
515 in = ep + 2;
516 }
517 strbuf_addstr(&outbuf, in);
518 strbuf_reset(it);
519 strbuf_addbuf(it, &outbuf);
6ac617a3 520 found_error = 0;
c6905e45
JH
521release_return:
522 strbuf_release(&outbuf);
523 strbuf_release(&charset_q);
524 strbuf_release(&piecebuf);
6ac617a3
JH
525
526 if (found_error)
527 mi->input_error = -1;
c6905e45
JH
528}
529
530static int check_header(struct mailinfo *mi,
531 const struct strbuf *line,
532 struct strbuf *hdr_data[], int overwrite)
533{
534 int i, ret = 0, len;
535 struct strbuf sb = STRBUF_INIT;
536
537 /* search for the interesting parts */
538 for (i = 0; header[i]; i++) {
539 int len = strlen(header[i]);
540 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
541 /* Unwrap inline B and Q encoding, and optionally
542 * normalize the meta information to utf8.
543 */
544 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
545 decode_header(mi, &sb);
546 handle_header(&hdr_data[i], &sb);
547 ret = 1;
548 goto check_header_out;
549 }
550 }
551
552 /* Content stuff */
553 if (cmp_header(line, "Content-Type")) {
554 len = strlen("Content-Type: ");
555 strbuf_add(&sb, line->buf + len, line->len - len);
556 decode_header(mi, &sb);
557 strbuf_insert(&sb, 0, "Content-Type: ", len);
558 handle_content_type(mi, &sb);
559 ret = 1;
560 goto check_header_out;
561 }
562 if (cmp_header(line, "Content-Transfer-Encoding")) {
563 len = strlen("Content-Transfer-Encoding: ");
564 strbuf_add(&sb, line->buf + len, line->len - len);
565 decode_header(mi, &sb);
566 handle_content_transfer_encoding(mi, &sb);
567 ret = 1;
568 goto check_header_out;
569 }
570 if (cmp_header(line, "Message-Id")) {
571 len = strlen("Message-Id: ");
572 strbuf_add(&sb, line->buf + len, line->len - len);
573 decode_header(mi, &sb);
ecf30b23
RS
574 if (mi->add_message_id)
575 mi->message_id = strbuf_detach(&sb, NULL);
c6905e45
JH
576 ret = 1;
577 goto check_header_out;
578 }
579
c6905e45
JH
580check_header_out:
581 strbuf_release(&sb);
582 return ret;
583}
584
6b4b013f
JT
585/*
586 * Returns 1 if the given line or any line beginning with the given line is an
587 * in-body header (that is, check_header will succeed when passed
588 * mi->s_hdr_data).
589 */
590static int is_inbody_header(const struct mailinfo *mi,
591 const struct strbuf *line)
592{
593 int i;
594 for (i = 0; header[i]; i++)
595 if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
596 return 1;
597 return 0;
598}
599
c6905e45
JH
600static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
601{
602 struct strbuf *ret;
603
604 switch (mi->transfer_encoding) {
605 case TE_QP:
606 ret = decode_q_segment(line, 0);
607 break;
608 case TE_BASE64:
609 ret = decode_b_segment(line);
610 break;
611 case TE_DONTCARE:
612 default:
613 return;
614 }
615 strbuf_reset(line);
616 strbuf_addbuf(line, ret);
617 strbuf_release(ret);
618 free(ret);
619}
620
621static inline int patchbreak(const struct strbuf *line)
622{
623 size_t i;
624
625 /* Beginning of a "diff -" header? */
626 if (starts_with(line->buf, "diff -"))
627 return 1;
628
629 /* CVS "Index: " line? */
630 if (starts_with(line->buf, "Index: "))
631 return 1;
632
633 /*
634 * "--- <filename>" starts patches without headers
635 * "---<sp>*" is a manual separator
636 */
637 if (line->len < 4)
638 return 0;
639
640 if (starts_with(line->buf, "---")) {
641 /* space followed by a filename? */
642 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
643 return 1;
644 /* Just whitespace? */
645 for (i = 3; i < line->len; i++) {
646 unsigned char c = line->buf[i];
647 if (c == '\n')
648 return 1;
649 if (!isspace(c))
650 break;
651 }
652 return 0;
653 }
654 return 0;
655}
656
9c5681da 657static int is_scissors_line(const char *line)
c6905e45 658{
9c5681da 659 const char *c;
c6905e45 660 int scissors = 0, gap = 0;
9c5681da
JT
661 const char *first_nonblank = NULL, *last_nonblank = NULL;
662 int visible, perforation = 0, in_perforation = 0;
c6905e45 663
9c5681da
JT
664 for (c = line; *c; c++) {
665 if (isspace(*c)) {
c6905e45
JH
666 if (in_perforation) {
667 perforation++;
668 gap++;
669 }
670 continue;
671 }
9c5681da
JT
672 last_nonblank = c;
673 if (first_nonblank == NULL)
674 first_nonblank = c;
675 if (*c == '-') {
c6905e45
JH
676 in_perforation = 1;
677 perforation++;
678 continue;
679 }
9c5681da
JT
680 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
681 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
c6905e45
JH
682 in_perforation = 1;
683 perforation += 2;
684 scissors += 2;
9c5681da 685 c++;
c6905e45
JH
686 continue;
687 }
688 in_perforation = 0;
689 }
690
691 /*
692 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
693 * Even though there can be arbitrary cruft on the same line
694 * (e.g. "cut here"), in order to avoid misidentification, the
695 * perforation must occupy more than a third of the visible
696 * width of the line, and dashes and scissors must occupy more
697 * than half of the perforation.
698 */
699
9c5681da
JT
700 if (first_nonblank && last_nonblank)
701 visible = last_nonblank - first_nonblank + 1;
702 else
703 visible = 0;
c6905e45
JH
704 return (scissors && 8 <= visible &&
705 visible < perforation * 3 &&
706 gap * 2 < perforation);
707}
708
6b4b013f
JT
709static void flush_inbody_header_accum(struct mailinfo *mi)
710{
711 if (!mi->inbody_header_accum.len)
712 return;
08414938
KM
713 if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
714 die("BUG: inbody_header_accum, if not empty, must always contain a valid in-body header");
6b4b013f
JT
715 strbuf_reset(&mi->inbody_header_accum);
716}
717
334192b4
JT
718static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
719{
6b4b013f
JT
720 if (mi->inbody_header_accum.len &&
721 (line->buf[0] == ' ' || line->buf[0] == '\t')) {
722 if (mi->use_scissors && is_scissors_line(line->buf)) {
723 /*
724 * This is a scissors line; do not consider this line
725 * as a header continuation line.
726 */
727 flush_inbody_header_accum(mi);
728 return 0;
729 }
730 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
731 strbuf_addbuf(&mi->inbody_header_accum, line);
732 return 1;
733 }
734
735 flush_inbody_header_accum(mi);
736
334192b4
JT
737 if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
738 return is_format_patch_separator(line->buf + 1, line->len - 1);
739 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
740 int i;
741 for (i = 0; header[i]; i++)
742 if (!strcmp("Subject", header[i])) {
743 handle_header(&mi->s_hdr_data[i], line);
744 return 1;
745 }
746 return 0;
747 }
6b4b013f
JT
748 if (is_inbody_header(mi, line)) {
749 strbuf_addbuf(&mi->inbody_header_accum, line);
750 return 1;
751 }
752 return 0;
334192b4
JT
753}
754
c6905e45
JH
755static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
756{
757 assert(!mi->filter_stage);
758
759 if (mi->header_stage) {
fd1062e5
LT
760 if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
761 if (mi->inbody_header_accum.len) {
762 flush_inbody_header_accum(mi);
763 mi->header_stage = 0;
764 }
c6905e45 765 return 0;
fd1062e5 766 }
c6905e45
JH
767 }
768
769 if (mi->use_inbody_headers && mi->header_stage) {
334192b4 770 mi->header_stage = check_inbody_header(mi, line);
c6905e45
JH
771 if (mi->header_stage)
772 return 0;
773 } else
774 /* Only trim the first (blank) line of the commit message
775 * when ignoring in-body headers.
776 */
777 mi->header_stage = 0;
778
779 /* normalize the log message to UTF-8. */
669b963a 780 if (convert_to_utf8(mi, line, mi->charset.buf))
6ac617a3 781 return 0; /* mi->input_error already set */
c6905e45 782
9c5681da 783 if (mi->use_scissors && is_scissors_line(line->buf)) {
c6905e45
JH
784 int i;
785
786 strbuf_setlen(&mi->log_message, 0);
787 mi->header_stage = 1;
788
789 /*
790 * We may have already read "secondary headers"; purge
791 * them to give ourselves a clean restart.
792 */
793 for (i = 0; header[i]; i++) {
794 if (mi->s_hdr_data[i])
795 strbuf_release(mi->s_hdr_data[i]);
796 mi->s_hdr_data[i] = NULL;
797 }
798 return 0;
799 }
800
801 if (patchbreak(line)) {
802 if (mi->message_id)
803 strbuf_addf(&mi->log_message,
804 "Message-Id: %s\n", mi->message_id);
805 return 1;
806 }
807
808 strbuf_addbuf(&mi->log_message, line);
809 return 0;
810}
811
812static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
813{
814 fwrite(line->buf, 1, line->len, mi->patchfile);
815 mi->patch_lines++;
816}
817
818static void handle_filter(struct mailinfo *mi, struct strbuf *line)
819{
820 switch (mi->filter_stage) {
821 case 0:
822 if (!handle_commit_msg(mi, line))
823 break;
824 mi->filter_stage++;
825 case 1:
826 handle_patch(mi, line);
827 break;
828 }
829}
830
831static int is_rfc2822_header(const struct strbuf *line)
832{
833 /*
834 * The section that defines the loosest possible
835 * field name is "3.6.8 Optional fields".
836 *
837 * optional-field = field-name ":" unstructured CRLF
838 * field-name = 1*ftext
839 * ftext = %d33-57 / %59-126
840 */
841 int ch;
842 char *cp = line->buf;
843
844 /* Count mbox From headers as headers */
845 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
846 return 1;
847
848 while ((ch = *cp++)) {
849 if (ch == ':')
850 return 1;
851 if ((33 <= ch && ch <= 57) ||
852 (59 <= ch && ch <= 126))
853 continue;
854 break;
855 }
856 return 0;
857}
858
859static int read_one_header_line(struct strbuf *line, FILE *in)
860{
861 struct strbuf continuation = STRBUF_INIT;
862
863 /* Get the first part of the line. */
8f309aeb 864 if (strbuf_getline_lf(line, in))
c6905e45
JH
865 return 0;
866
867 /*
868 * Is it an empty line or not a valid rfc2822 header?
869 * If so, stop here, and return false ("not a header")
870 */
871 strbuf_rtrim(line);
872 if (!line->len || !is_rfc2822_header(line)) {
873 /* Re-add the newline */
874 strbuf_addch(line, '\n');
875 return 0;
876 }
877
878 /*
879 * Now we need to eat all the continuation lines..
880 * Yuck, 2822 header "folding"
881 */
882 for (;;) {
883 int peek;
884
885 peek = fgetc(in); ungetc(peek, in);
886 if (peek != ' ' && peek != '\t')
887 break;
8f309aeb 888 if (strbuf_getline_lf(&continuation, in))
c6905e45
JH
889 break;
890 continuation.buf[0] = ' ';
891 strbuf_rtrim(&continuation);
892 strbuf_addbuf(line, &continuation);
893 }
894 strbuf_release(&continuation);
895
896 return 1;
897}
898
899static int find_boundary(struct mailinfo *mi, struct strbuf *line)
900{
8f309aeb 901 while (!strbuf_getline_lf(line, mi->input)) {
c6905e45
JH
902 if (*(mi->content_top) && is_multipart_boundary(mi, line))
903 return 1;
904 }
905 return 0;
906}
907
908static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
909{
910 struct strbuf newline = STRBUF_INIT;
911
912 strbuf_addch(&newline, '\n');
913again:
914 if (line->len >= (*(mi->content_top))->len + 2 &&
915 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
916 /* we hit an end boundary */
917 /* pop the current boundary off the stack */
918 strbuf_release(*(mi->content_top));
919 free(*(mi->content_top));
920 *(mi->content_top) = NULL;
921
922 /* technically won't happen as is_multipart_boundary()
923 will fail first. But just in case..
924 */
925 if (--mi->content_top < mi->content) {
6ac617a3
JH
926 error("Detected mismatched boundaries, can't recover");
927 mi->input_error = -1;
928 mi->content_top = mi->content;
929 return 0;
c6905e45
JH
930 }
931 handle_filter(mi, &newline);
932 strbuf_release(&newline);
6ac617a3
JH
933 if (mi->input_error)
934 return 0;
c6905e45
JH
935
936 /* skip to the next boundary */
937 if (!find_boundary(mi, line))
938 return 0;
939 goto again;
940 }
941
942 /* set some defaults */
943 mi->transfer_encoding = TE_DONTCARE;
944 strbuf_reset(&mi->charset);
945
946 /* slurp in this section's info */
947 while (read_one_header_line(line, mi->input))
948 check_header(mi, line, mi->p_hdr_data, 0);
949
950 strbuf_release(&newline);
951 /* replenish line */
8f309aeb 952 if (strbuf_getline_lf(line, mi->input))
c6905e45
JH
953 return 0;
954 strbuf_addch(line, '\n');
955 return 1;
956}
957
958static void handle_body(struct mailinfo *mi, struct strbuf *line)
959{
960 struct strbuf prev = STRBUF_INIT;
961
962 /* Skip up to the first boundary */
963 if (*(mi->content_top)) {
964 if (!find_boundary(mi, line))
965 goto handle_body_out;
966 }
967
968 do {
969 /* process any boundary lines */
970 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
971 /* flush any leftover */
972 if (prev.len) {
973 handle_filter(mi, &prev);
974 strbuf_reset(&prev);
975 }
976 if (!handle_boundary(mi, line))
977 goto handle_body_out;
978 }
979
980 /* Unwrap transfer encoding */
981 decode_transfer_encoding(mi, line);
982
983 switch (mi->transfer_encoding) {
984 case TE_BASE64:
985 case TE_QP:
986 {
987 struct strbuf **lines, **it, *sb;
988
989 /* Prepend any previous partial lines */
990 strbuf_insert(line, 0, prev.buf, prev.len);
991 strbuf_reset(&prev);
992
993 /*
994 * This is a decoded line that may contain
995 * multiple new lines. Pass only one chunk
996 * at a time to handle_filter()
997 */
998 lines = strbuf_split(line, '\n');
999 for (it = lines; (sb = *it); it++) {
1000 if (*(it + 1) == NULL) /* The last line */
1001 if (sb->buf[sb->len - 1] != '\n') {
1002 /* Partial line, save it for later. */
1003 strbuf_addbuf(&prev, sb);
1004 break;
1005 }
1006 handle_filter(mi, sb);
1007 }
1008 /*
1009 * The partial chunk is saved in "prev" and will be
1010 * appended by the next iteration of read_line_with_nul().
1011 */
1012 strbuf_list_free(lines);
1013 break;
1014 }
1015 default:
1016 handle_filter(mi, line);
1017 }
1018
6ac617a3
JH
1019 if (mi->input_error)
1020 break;
c6905e45
JH
1021 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1022
6b4b013f
JT
1023 flush_inbody_header_accum(mi);
1024
c6905e45
JH
1025handle_body_out:
1026 strbuf_release(&prev);
1027}
1028
1029static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1030{
1031 const char *sp = data->buf;
1032 while (1) {
1033 char *ep = strchr(sp, '\n');
1034 int len;
1035 if (!ep)
1036 len = strlen(sp);
1037 else
1038 len = ep - sp;
1039 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1040 if (!ep)
1041 break;
1042 sp = ep + 1;
1043 }
1044}
1045
1046static void handle_info(struct mailinfo *mi)
1047{
1048 struct strbuf *hdr;
1049 int i;
1050
1051 for (i = 0; header[i]; i++) {
1052 /* only print inbody headers if we output a patch file */
1053 if (mi->patch_lines && mi->s_hdr_data[i])
1054 hdr = mi->s_hdr_data[i];
1055 else if (mi->p_hdr_data[i])
1056 hdr = mi->p_hdr_data[i];
1057 else
1058 continue;
1059
1060 if (!strcmp(header[i], "Subject")) {
1061 if (!mi->keep_subject) {
1062 cleanup_subject(mi, hdr);
1063 cleanup_space(hdr);
1064 }
1065 output_header_lines(mi->output, "Subject", hdr);
1066 } else if (!strcmp(header[i], "From")) {
1067 cleanup_space(hdr);
1068 handle_from(mi, hdr);
1069 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1070 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1071 } else {
1072 cleanup_space(hdr);
1073 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1074 }
1075 }
1076 fprintf(mi->output, "\n");
1077}
1078
1079int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1080{
1081 FILE *cmitmsg;
1082 int peek;
1083 struct strbuf line = STRBUF_INIT;
1084
1085 cmitmsg = fopen(msg, "w");
1086 if (!cmitmsg) {
1087 perror(msg);
1088 return -1;
1089 }
1090 mi->patchfile = fopen(patch, "w");
1091 if (!mi->patchfile) {
1092 perror(patch);
1093 fclose(cmitmsg);
1094 return -1;
1095 }
1096
1097 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1098 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1099
1100 do {
1101 peek = fgetc(mi->input);
1102 } while (isspace(peek));
1103 ungetc(peek, mi->input);
1104
1105 /* process the email header */
1106 while (read_one_header_line(&line, mi->input))
1107 check_header(mi, &line, mi->p_hdr_data, 1);
1108
1109 handle_body(mi, &line);
1110 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1111 fclose(cmitmsg);
1112 fclose(mi->patchfile);
1113
1114 handle_info(mi);
1115 strbuf_release(&line);
6ac617a3 1116 return mi->input_error;
c6905e45
JH
1117}
1118
1119static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1120{
1121 struct mailinfo *mi = mi_;
1122
1123 if (!starts_with(var, "mailinfo."))
1124 return git_default_config(var, value, NULL);
1125 if (!strcmp(var, "mailinfo.scissors")) {
1126 mi->use_scissors = git_config_bool(var, value);
1127 return 0;
1128 }
1129 /* perhaps others here */
1130 return 0;
1131}
1132
1133void setup_mailinfo(struct mailinfo *mi)
1134{
1135 memset(mi, 0, sizeof(*mi));
1136 strbuf_init(&mi->name, 0);
1137 strbuf_init(&mi->email, 0);
1138 strbuf_init(&mi->charset, 0);
1139 strbuf_init(&mi->log_message, 0);
6b4b013f 1140 strbuf_init(&mi->inbody_header_accum, 0);
c6905e45
JH
1141 mi->header_stage = 1;
1142 mi->use_inbody_headers = 1;
1143 mi->content_top = mi->content;
85d9d9dd 1144 git_config(git_mailinfo_config, mi);
c6905e45
JH
1145}
1146
1147void clear_mailinfo(struct mailinfo *mi)
1148{
1149 int i;
1150
1151 strbuf_release(&mi->name);
1152 strbuf_release(&mi->email);
1153 strbuf_release(&mi->charset);
6b4b013f 1154 strbuf_release(&mi->inbody_header_accum);
c6905e45
JH
1155 free(mi->message_id);
1156
1157 for (i = 0; mi->p_hdr_data[i]; i++)
1158 strbuf_release(mi->p_hdr_data[i]);
1159 free(mi->p_hdr_data);
1160 for (i = 0; mi->s_hdr_data[i]; i++)
1161 strbuf_release(mi->s_hdr_data[i]);
1162 free(mi->s_hdr_data);
1163
1164 while (mi->content < mi->content_top) {
1165 free(*(mi->content_top));
1166 mi->content_top--;
1167 }
1168
1169 strbuf_release(&mi->log_message);
1170}