Twelfth batch for 2.14
[git/git.git] / mailinfo.c
CommitLineData
c6905e45 1#include "cache.h"
b2141fc1 2#include "config.h"
c6905e45
JH
3#include "utf8.h"
4#include "strbuf.h"
5#include "mailinfo.h"
6
7static 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
19static 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
31static 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
f357e5de
KD
58static const char *unquote_comment(struct strbuf *outbuf, const char *in)
59{
60 int c;
61 int take_next_litterally = 0;
62
63 strbuf_addch(outbuf, '(');
64
65 while ((c = *in++) != 0) {
66 if (take_next_litterally == 1) {
67 take_next_litterally = 0;
68 } else {
69 switch (c) {
70 case '\\':
71 take_next_litterally = 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
88static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
89{
90 int c;
91 int take_next_litterally = 0;
92
93 while ((c = *in++) != 0) {
94 if (take_next_litterally == 1) {
95 take_next_litterally = 0;
96 } else {
97 switch (c) {
98 case '\\':
99 take_next_litterally = 1;
100 continue;
101 case '"':
102 return in;
103 }
104 }
105
106 strbuf_addch(outbuf, c);
107 }
108
109 return in;
110}
111
112static 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
c6905e45
JH
138static 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
f357e5de
KD
147 unquote_quoted_pair(&f);
148
c6905e45
JH
149 at = strchr(f.buf, '@');
150 if (!at) {
151 parse_bogus_from(mi, from);
152 return;
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 strbuf_release(&f);
160 return;
161 }
162
163 /* Pick up the string around '@', possibly delimited with <>
164 * pair; that is the email part.
165 */
166 while (at > f.buf) {
167 char c = at[-1];
168 if (isspace(c))
169 break;
170 if (c == '<') {
171 at[-1] = ' ';
172 break;
173 }
174 at--;
175 }
176 el = strcspn(at, " \n\t\r\v\f>");
177 strbuf_reset(&mi->email);
178 strbuf_add(&mi->email, at, el);
179 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
180
181 /* The remainder is name. It could be
182 *
183 * - "John Doe <john.doe@xz>" (a), or
184 * - "john.doe@xz (John Doe)" (b), or
185 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
186 *
187 * but we have removed the email part, so
188 *
189 * - remove extra spaces which could stay after email (case 'c'), and
190 * - trim from both ends, possibly removing the () pair at the end
191 * (cases 'a' and 'b').
192 */
193 cleanup_space(&f);
194 strbuf_trim(&f);
195 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
196 strbuf_remove(&f, 0, 1);
197 strbuf_setlen(&f, f.len - 1);
198 }
199
200 get_sane_name(&mi->name, &f, &mi->email);
201 strbuf_release(&f);
202}
203
204static void handle_header(struct strbuf **out, const struct strbuf *line)
205{
206 if (!*out) {
207 *out = xmalloc(sizeof(struct strbuf));
208 strbuf_init(*out, line->len);
209 } else
210 strbuf_reset(*out);
211
212 strbuf_addbuf(*out, line);
213}
214
215/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
216 * to have enough heuristics to grok MIME encoded patches often found
217 * on our mailing lists. For example, we do not even treat header lines
218 * case insensitively.
219 */
220
221static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
222{
223 const char *ends, *ap = strcasestr(line, name);
224 size_t sz;
225
226 strbuf_setlen(attr, 0);
227 if (!ap)
228 return 0;
229 ap += strlen(name);
230 if (*ap == '"') {
231 ap++;
232 ends = "\"";
233 }
234 else
235 ends = "; \t";
236 sz = strcspn(ap, ends);
237 strbuf_add(attr, ap, sz);
238 return 1;
239}
240
241static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
242{
243 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
244 strbuf_init(boundary, line->len);
245
246 if (slurp_attr(line->buf, "boundary=", boundary)) {
247 strbuf_insert(boundary, 0, "--", 2);
248 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
6ac617a3
JH
249 error("Too many boundaries to handle");
250 mi->input_error = -1;
251 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
252 return;
c6905e45
JH
253 }
254 *(mi->content_top) = boundary;
255 boundary = NULL;
256 }
257 slurp_attr(line->buf, "charset=", &mi->charset);
258
259 if (boundary) {
260 strbuf_release(boundary);
261 free(boundary);
262 }
263}
264
c6905e45
JH
265static void handle_content_transfer_encoding(struct mailinfo *mi,
266 const struct strbuf *line)
267{
268 if (strcasestr(line->buf, "base64"))
269 mi->transfer_encoding = TE_BASE64;
270 else if (strcasestr(line->buf, "quoted-printable"))
271 mi->transfer_encoding = TE_QP;
272 else
273 mi->transfer_encoding = TE_DONTCARE;
274}
275
276static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
277{
278 struct strbuf *content_top = *(mi->content_top);
279
280 return ((content_top->len <= line->len) &&
281 !memcmp(line->buf, content_top->buf, content_top->len));
282}
283
284static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
285{
286 size_t at = 0;
287
288 while (at < subject->len) {
289 char *pos;
290 size_t remove;
291
292 switch (subject->buf[at]) {
293 case 'r': case 'R':
294 if (subject->len <= at + 3)
295 break;
296 if ((subject->buf[at + 1] == 'e' ||
297 subject->buf[at + 1] == 'E') &&
298 subject->buf[at + 2] == ':') {
299 strbuf_remove(subject, at, 3);
300 continue;
301 }
302 at++;
303 break;
304 case ' ': case '\t': case ':':
305 strbuf_remove(subject, at, 1);
306 continue;
307 case '[':
308 pos = strchr(subject->buf + at, ']');
309 if (!pos)
310 break;
311 remove = pos - subject->buf + at + 1;
312 if (!mi->keep_non_patch_brackets_in_subject ||
313 (7 <= remove &&
314 memmem(subject->buf + at, remove, "PATCH", 5)))
315 strbuf_remove(subject, at, remove);
316 else {
317 at += remove;
318 /*
319 * If the input had a space after the ], keep
320 * it. We don't bother with finding the end of
321 * the space, since we later normalize it
322 * anyway.
323 */
324 if (isspace(subject->buf[at]))
325 at += 1;
326 }
327 continue;
328 }
329 break;
330 }
331 strbuf_trim(subject);
332}
333
334#define MAX_HDR_PARSED 10
335static const char *header[MAX_HDR_PARSED] = {
336 "From","Subject","Date",
337};
338
339static inline int cmp_header(const struct strbuf *line, const char *hdr)
340{
341 int len = strlen(hdr);
342 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
343 line->buf[len] == ':' && isspace(line->buf[len + 1]);
344}
345
346static int is_format_patch_separator(const char *line, int len)
347{
348 static const char SAMPLE[] =
349 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
350 const char *cp;
351
352 if (len != strlen(SAMPLE))
353 return 0;
354 if (!skip_prefix(line, "From ", &cp))
355 return 0;
356 if (strspn(cp, "0123456789abcdef") != 40)
357 return 0;
358 cp += 40;
359 return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
360}
361
362static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
363{
364 const char *in = q_seg->buf;
365 int c;
366 struct strbuf *out = xmalloc(sizeof(struct strbuf));
367 strbuf_init(out, q_seg->len);
368
369 while ((c = *in++) != 0) {
370 if (c == '=') {
371 int d = *in++;
372 if (d == '\n' || !d)
373 break; /* drop trailing newline */
374 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
375 continue;
376 }
377 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
378 c = 0x20;
379 strbuf_addch(out, c);
380 }
381 return out;
382}
383
384static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
385{
386 /* Decode in..ep, possibly in-place to ot */
387 int c, pos = 0, acc = 0;
388 const char *in = b_seg->buf;
389 struct strbuf *out = xmalloc(sizeof(struct strbuf));
390 strbuf_init(out, b_seg->len);
391
392 while ((c = *in++) != 0) {
393 if (c == '+')
394 c = 62;
395 else if (c == '/')
396 c = 63;
397 else if ('A' <= c && c <= 'Z')
398 c -= 'A';
399 else if ('a' <= c && c <= 'z')
400 c -= 'a' - 26;
401 else if ('0' <= c && c <= '9')
402 c -= '0' - 52;
403 else
404 continue; /* garbage */
405 switch (pos++) {
406 case 0:
407 acc = (c << 2);
408 break;
409 case 1:
410 strbuf_addch(out, (acc | (c >> 4)));
411 acc = (c & 15) << 4;
412 break;
413 case 2:
414 strbuf_addch(out, (acc | (c >> 2)));
415 acc = (c & 3) << 6;
416 break;
417 case 3:
418 strbuf_addch(out, (acc | c));
419 acc = pos = 0;
420 break;
421 }
422 }
423 return out;
424}
425
669b963a
JH
426static int convert_to_utf8(struct mailinfo *mi,
427 struct strbuf *line, const char *charset)
c6905e45
JH
428{
429 char *out;
430
431 if (!mi->metainfo_charset || !charset || !*charset)
669b963a 432 return 0;
c6905e45
JH
433
434 if (same_encoding(mi->metainfo_charset, charset))
669b963a 435 return 0;
c6905e45 436 out = reencode_string(line->buf, mi->metainfo_charset, charset);
6ac617a3
JH
437 if (!out) {
438 mi->input_error = -1;
669b963a
JH
439 return error("cannot convert from %s to %s",
440 charset, mi->metainfo_charset);
6ac617a3 441 }
c6905e45 442 strbuf_attach(line, out, strlen(out), strlen(out));
669b963a 443 return 0;
c6905e45
JH
444}
445
446static void decode_header(struct mailinfo *mi, struct strbuf *it)
447{
448 char *in, *ep, *cp;
449 struct strbuf outbuf = STRBUF_INIT, *dec;
450 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
6ac617a3 451 int found_error = 1; /* pessimism */
c6905e45
JH
452
453 in = it->buf;
454 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
455 int encoding;
456 strbuf_reset(&charset_q);
457 strbuf_reset(&piecebuf);
458
459 if (in != ep) {
460 /*
461 * We are about to process an encoded-word
462 * that begins at ep, but there is something
463 * before the encoded word.
464 */
465 char *scan;
466 for (scan = in; scan < ep; scan++)
467 if (!isspace(*scan))
468 break;
469
470 if (scan != ep || in == it->buf) {
471 /*
472 * We should not lose that "something",
473 * unless we have just processed an
474 * encoded-word, and there is only LWS
475 * before the one we are about to process.
476 */
477 strbuf_add(&outbuf, in, ep - in);
478 }
479 }
480 /* E.g.
481 * ep : "=?iso-2022-jp?B?GyR...?= foo"
482 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
483 */
484 ep += 2;
485
486 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
487 goto release_return;
488
489 if (cp + 3 - it->buf > it->len)
490 goto release_return;
491 strbuf_add(&charset_q, ep, cp - ep);
492
493 encoding = cp[1];
494 if (!encoding || cp[2] != '?')
495 goto release_return;
496 ep = strstr(cp + 3, "?=");
497 if (!ep)
498 goto release_return;
499 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
500 switch (tolower(encoding)) {
501 default:
502 goto release_return;
503 case 'b':
504 dec = decode_b_segment(&piecebuf);
505 break;
506 case 'q':
507 dec = decode_q_segment(&piecebuf, 1);
508 break;
509 }
669b963a
JH
510 if (convert_to_utf8(mi, dec, charset_q.buf))
511 goto release_return;
c6905e45
JH
512
513 strbuf_addbuf(&outbuf, dec);
514 strbuf_release(dec);
515 free(dec);
516 in = ep + 2;
517 }
518 strbuf_addstr(&outbuf, in);
519 strbuf_reset(it);
520 strbuf_addbuf(it, &outbuf);
6ac617a3 521 found_error = 0;
c6905e45
JH
522release_return:
523 strbuf_release(&outbuf);
524 strbuf_release(&charset_q);
525 strbuf_release(&piecebuf);
6ac617a3
JH
526
527 if (found_error)
528 mi->input_error = -1;
c6905e45
JH
529}
530
531static int check_header(struct mailinfo *mi,
532 const struct strbuf *line,
533 struct strbuf *hdr_data[], int overwrite)
534{
535 int i, ret = 0, len;
536 struct strbuf sb = STRBUF_INIT;
537
538 /* search for the interesting parts */
539 for (i = 0; header[i]; i++) {
540 int len = strlen(header[i]);
541 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
542 /* Unwrap inline B and Q encoding, and optionally
543 * normalize the meta information to utf8.
544 */
545 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
546 decode_header(mi, &sb);
547 handle_header(&hdr_data[i], &sb);
548 ret = 1;
549 goto check_header_out;
550 }
551 }
552
553 /* Content stuff */
554 if (cmp_header(line, "Content-Type")) {
555 len = strlen("Content-Type: ");
556 strbuf_add(&sb, line->buf + len, line->len - len);
557 decode_header(mi, &sb);
558 strbuf_insert(&sb, 0, "Content-Type: ", len);
559 handle_content_type(mi, &sb);
560 ret = 1;
561 goto check_header_out;
562 }
563 if (cmp_header(line, "Content-Transfer-Encoding")) {
564 len = strlen("Content-Transfer-Encoding: ");
565 strbuf_add(&sb, line->buf + len, line->len - len);
566 decode_header(mi, &sb);
567 handle_content_transfer_encoding(mi, &sb);
568 ret = 1;
569 goto check_header_out;
570 }
571 if (cmp_header(line, "Message-Id")) {
572 len = strlen("Message-Id: ");
573 strbuf_add(&sb, line->buf + len, line->len - len);
574 decode_header(mi, &sb);
ecf30b23
RS
575 if (mi->add_message_id)
576 mi->message_id = strbuf_detach(&sb, NULL);
c6905e45
JH
577 ret = 1;
578 goto check_header_out;
579 }
580
c6905e45
JH
581check_header_out:
582 strbuf_release(&sb);
583 return ret;
584}
585
6b4b013f
JT
586/*
587 * Returns 1 if the given line or any line beginning with the given line is an
588 * in-body header (that is, check_header will succeed when passed
589 * mi->s_hdr_data).
590 */
591static int is_inbody_header(const struct mailinfo *mi,
592 const struct strbuf *line)
593{
594 int i;
595 for (i = 0; header[i]; i++)
596 if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
597 return 1;
598 return 0;
599}
600
c6905e45
JH
601static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
602{
603 struct strbuf *ret;
604
605 switch (mi->transfer_encoding) {
606 case TE_QP:
607 ret = decode_q_segment(line, 0);
608 break;
609 case TE_BASE64:
610 ret = decode_b_segment(line);
611 break;
612 case TE_DONTCARE:
613 default:
614 return;
615 }
616 strbuf_reset(line);
617 strbuf_addbuf(line, ret);
618 strbuf_release(ret);
619 free(ret);
620}
621
622static inline int patchbreak(const struct strbuf *line)
623{
624 size_t i;
625
626 /* Beginning of a "diff -" header? */
627 if (starts_with(line->buf, "diff -"))
628 return 1;
629
630 /* CVS "Index: " line? */
631 if (starts_with(line->buf, "Index: "))
632 return 1;
633
634 /*
635 * "--- <filename>" starts patches without headers
636 * "---<sp>*" is a manual separator
637 */
638 if (line->len < 4)
639 return 0;
640
641 if (starts_with(line->buf, "---")) {
642 /* space followed by a filename? */
643 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
644 return 1;
645 /* Just whitespace? */
646 for (i = 3; i < line->len; i++) {
647 unsigned char c = line->buf[i];
648 if (c == '\n')
649 return 1;
650 if (!isspace(c))
651 break;
652 }
653 return 0;
654 }
655 return 0;
656}
657
9c5681da 658static int is_scissors_line(const char *line)
c6905e45 659{
9c5681da 660 const char *c;
c6905e45 661 int scissors = 0, gap = 0;
9c5681da
JT
662 const char *first_nonblank = NULL, *last_nonblank = NULL;
663 int visible, perforation = 0, in_perforation = 0;
c6905e45 664
9c5681da
JT
665 for (c = line; *c; c++) {
666 if (isspace(*c)) {
c6905e45
JH
667 if (in_perforation) {
668 perforation++;
669 gap++;
670 }
671 continue;
672 }
9c5681da
JT
673 last_nonblank = c;
674 if (first_nonblank == NULL)
675 first_nonblank = c;
676 if (*c == '-') {
c6905e45
JH
677 in_perforation = 1;
678 perforation++;
679 continue;
680 }
9c5681da
JT
681 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
682 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
c6905e45
JH
683 in_perforation = 1;
684 perforation += 2;
685 scissors += 2;
9c5681da 686 c++;
c6905e45
JH
687 continue;
688 }
689 in_perforation = 0;
690 }
691
692 /*
693 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
694 * Even though there can be arbitrary cruft on the same line
695 * (e.g. "cut here"), in order to avoid misidentification, the
696 * perforation must occupy more than a third of the visible
697 * width of the line, and dashes and scissors must occupy more
698 * than half of the perforation.
699 */
700
9c5681da
JT
701 if (first_nonblank && last_nonblank)
702 visible = last_nonblank - first_nonblank + 1;
703 else
704 visible = 0;
c6905e45
JH
705 return (scissors && 8 <= visible &&
706 visible < perforation * 3 &&
707 gap * 2 < perforation);
708}
709
6b4b013f
JT
710static void flush_inbody_header_accum(struct mailinfo *mi)
711{
712 if (!mi->inbody_header_accum.len)
713 return;
08414938
KM
714 if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
715 die("BUG: inbody_header_accum, if not empty, must always contain a valid in-body header");
6b4b013f
JT
716 strbuf_reset(&mi->inbody_header_accum);
717}
718
334192b4
JT
719static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
720{
6b4b013f
JT
721 if (mi->inbody_header_accum.len &&
722 (line->buf[0] == ' ' || line->buf[0] == '\t')) {
723 if (mi->use_scissors && is_scissors_line(line->buf)) {
724 /*
725 * This is a scissors line; do not consider this line
726 * as a header continuation line.
727 */
728 flush_inbody_header_accum(mi);
729 return 0;
730 }
731 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
732 strbuf_addbuf(&mi->inbody_header_accum, line);
733 return 1;
734 }
735
736 flush_inbody_header_accum(mi);
737
334192b4
JT
738 if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
739 return is_format_patch_separator(line->buf + 1, line->len - 1);
740 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
741 int i;
742 for (i = 0; header[i]; i++)
743 if (!strcmp("Subject", header[i])) {
744 handle_header(&mi->s_hdr_data[i], line);
745 return 1;
746 }
747 return 0;
748 }
6b4b013f
JT
749 if (is_inbody_header(mi, line)) {
750 strbuf_addbuf(&mi->inbody_header_accum, line);
751 return 1;
752 }
753 return 0;
334192b4
JT
754}
755
c6905e45
JH
756static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
757{
758 assert(!mi->filter_stage);
759
760 if (mi->header_stage) {
fd1062e5
LT
761 if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
762 if (mi->inbody_header_accum.len) {
763 flush_inbody_header_accum(mi);
764 mi->header_stage = 0;
765 }
c6905e45 766 return 0;
fd1062e5 767 }
c6905e45
JH
768 }
769
770 if (mi->use_inbody_headers && mi->header_stage) {
334192b4 771 mi->header_stage = check_inbody_header(mi, line);
c6905e45
JH
772 if (mi->header_stage)
773 return 0;
774 } else
775 /* Only trim the first (blank) line of the commit message
776 * when ignoring in-body headers.
777 */
778 mi->header_stage = 0;
779
780 /* normalize the log message to UTF-8. */
669b963a 781 if (convert_to_utf8(mi, line, mi->charset.buf))
6ac617a3 782 return 0; /* mi->input_error already set */
c6905e45 783
9c5681da 784 if (mi->use_scissors && is_scissors_line(line->buf)) {
c6905e45
JH
785 int i;
786
787 strbuf_setlen(&mi->log_message, 0);
788 mi->header_stage = 1;
789
790 /*
791 * We may have already read "secondary headers"; purge
792 * them to give ourselves a clean restart.
793 */
794 for (i = 0; header[i]; i++) {
795 if (mi->s_hdr_data[i])
796 strbuf_release(mi->s_hdr_data[i]);
797 mi->s_hdr_data[i] = NULL;
798 }
799 return 0;
800 }
801
802 if (patchbreak(line)) {
803 if (mi->message_id)
804 strbuf_addf(&mi->log_message,
805 "Message-Id: %s\n", mi->message_id);
806 return 1;
807 }
808
809 strbuf_addbuf(&mi->log_message, line);
810 return 0;
811}
812
813static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
814{
815 fwrite(line->buf, 1, line->len, mi->patchfile);
816 mi->patch_lines++;
817}
818
819static void handle_filter(struct mailinfo *mi, struct strbuf *line)
820{
821 switch (mi->filter_stage) {
822 case 0:
823 if (!handle_commit_msg(mi, line))
824 break;
825 mi->filter_stage++;
826 case 1:
827 handle_patch(mi, line);
828 break;
829 }
830}
831
832static int is_rfc2822_header(const struct strbuf *line)
833{
834 /*
835 * The section that defines the loosest possible
836 * field name is "3.6.8 Optional fields".
837 *
838 * optional-field = field-name ":" unstructured CRLF
839 * field-name = 1*ftext
840 * ftext = %d33-57 / %59-126
841 */
842 int ch;
843 char *cp = line->buf;
844
845 /* Count mbox From headers as headers */
846 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
847 return 1;
848
849 while ((ch = *cp++)) {
850 if (ch == ':')
851 return 1;
852 if ((33 <= ch && ch <= 57) ||
853 (59 <= ch && ch <= 126))
854 continue;
855 break;
856 }
857 return 0;
858}
859
860static int read_one_header_line(struct strbuf *line, FILE *in)
861{
862 struct strbuf continuation = STRBUF_INIT;
863
864 /* Get the first part of the line. */
8f309aeb 865 if (strbuf_getline_lf(line, in))
c6905e45
JH
866 return 0;
867
868 /*
869 * Is it an empty line or not a valid rfc2822 header?
870 * If so, stop here, and return false ("not a header")
871 */
872 strbuf_rtrim(line);
873 if (!line->len || !is_rfc2822_header(line)) {
874 /* Re-add the newline */
875 strbuf_addch(line, '\n');
876 return 0;
877 }
878
879 /*
880 * Now we need to eat all the continuation lines..
881 * Yuck, 2822 header "folding"
882 */
883 for (;;) {
884 int peek;
885
f0733c13
JS
886 peek = fgetc(in);
887 if (peek == EOF)
888 break;
889 ungetc(peek, in);
c6905e45
JH
890 if (peek != ' ' && peek != '\t')
891 break;
8f309aeb 892 if (strbuf_getline_lf(&continuation, in))
c6905e45
JH
893 break;
894 continuation.buf[0] = ' ';
895 strbuf_rtrim(&continuation);
896 strbuf_addbuf(line, &continuation);
897 }
898 strbuf_release(&continuation);
899
900 return 1;
901}
902
903static int find_boundary(struct mailinfo *mi, struct strbuf *line)
904{
8f309aeb 905 while (!strbuf_getline_lf(line, mi->input)) {
c6905e45
JH
906 if (*(mi->content_top) && is_multipart_boundary(mi, line))
907 return 1;
908 }
909 return 0;
910}
911
912static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
913{
914 struct strbuf newline = STRBUF_INIT;
915
916 strbuf_addch(&newline, '\n');
917again:
918 if (line->len >= (*(mi->content_top))->len + 2 &&
919 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
920 /* we hit an end boundary */
921 /* pop the current boundary off the stack */
922 strbuf_release(*(mi->content_top));
6a83d902 923 FREE_AND_NULL(*(mi->content_top));
c6905e45
JH
924
925 /* technically won't happen as is_multipart_boundary()
926 will fail first. But just in case..
927 */
928 if (--mi->content_top < mi->content) {
6ac617a3
JH
929 error("Detected mismatched boundaries, can't recover");
930 mi->input_error = -1;
931 mi->content_top = mi->content;
932 return 0;
c6905e45
JH
933 }
934 handle_filter(mi, &newline);
935 strbuf_release(&newline);
6ac617a3
JH
936 if (mi->input_error)
937 return 0;
c6905e45
JH
938
939 /* skip to the next boundary */
940 if (!find_boundary(mi, line))
941 return 0;
942 goto again;
943 }
944
945 /* set some defaults */
946 mi->transfer_encoding = TE_DONTCARE;
947 strbuf_reset(&mi->charset);
948
949 /* slurp in this section's info */
950 while (read_one_header_line(line, mi->input))
951 check_header(mi, line, mi->p_hdr_data, 0);
952
953 strbuf_release(&newline);
954 /* replenish line */
8f309aeb 955 if (strbuf_getline_lf(line, mi->input))
c6905e45
JH
956 return 0;
957 strbuf_addch(line, '\n');
958 return 1;
959}
960
961static void handle_body(struct mailinfo *mi, struct strbuf *line)
962{
963 struct strbuf prev = STRBUF_INIT;
964
965 /* Skip up to the first boundary */
966 if (*(mi->content_top)) {
967 if (!find_boundary(mi, line))
968 goto handle_body_out;
969 }
970
971 do {
972 /* process any boundary lines */
973 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
974 /* flush any leftover */
975 if (prev.len) {
976 handle_filter(mi, &prev);
977 strbuf_reset(&prev);
978 }
979 if (!handle_boundary(mi, line))
980 goto handle_body_out;
981 }
982
983 /* Unwrap transfer encoding */
984 decode_transfer_encoding(mi, line);
985
986 switch (mi->transfer_encoding) {
987 case TE_BASE64:
988 case TE_QP:
989 {
990 struct strbuf **lines, **it, *sb;
991
992 /* Prepend any previous partial lines */
993 strbuf_insert(line, 0, prev.buf, prev.len);
994 strbuf_reset(&prev);
995
996 /*
997 * This is a decoded line that may contain
998 * multiple new lines. Pass only one chunk
999 * at a time to handle_filter()
1000 */
1001 lines = strbuf_split(line, '\n');
1002 for (it = lines; (sb = *it); it++) {
1003 if (*(it + 1) == NULL) /* The last line */
1004 if (sb->buf[sb->len - 1] != '\n') {
1005 /* Partial line, save it for later. */
1006 strbuf_addbuf(&prev, sb);
1007 break;
1008 }
1009 handle_filter(mi, sb);
1010 }
1011 /*
1012 * The partial chunk is saved in "prev" and will be
1013 * appended by the next iteration of read_line_with_nul().
1014 */
1015 strbuf_list_free(lines);
1016 break;
1017 }
1018 default:
1019 handle_filter(mi, line);
1020 }
1021
6ac617a3
JH
1022 if (mi->input_error)
1023 break;
c6905e45
JH
1024 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1025
6b4b013f
JT
1026 flush_inbody_header_accum(mi);
1027
c6905e45
JH
1028handle_body_out:
1029 strbuf_release(&prev);
1030}
1031
1032static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1033{
1034 const char *sp = data->buf;
1035 while (1) {
1036 char *ep = strchr(sp, '\n');
1037 int len;
1038 if (!ep)
1039 len = strlen(sp);
1040 else
1041 len = ep - sp;
1042 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1043 if (!ep)
1044 break;
1045 sp = ep + 1;
1046 }
1047}
1048
1049static void handle_info(struct mailinfo *mi)
1050{
1051 struct strbuf *hdr;
1052 int i;
1053
1054 for (i = 0; header[i]; i++) {
1055 /* only print inbody headers if we output a patch file */
1056 if (mi->patch_lines && mi->s_hdr_data[i])
1057 hdr = mi->s_hdr_data[i];
1058 else if (mi->p_hdr_data[i])
1059 hdr = mi->p_hdr_data[i];
1060 else
1061 continue;
1062
1063 if (!strcmp(header[i], "Subject")) {
1064 if (!mi->keep_subject) {
1065 cleanup_subject(mi, hdr);
1066 cleanup_space(hdr);
1067 }
1068 output_header_lines(mi->output, "Subject", hdr);
1069 } else if (!strcmp(header[i], "From")) {
1070 cleanup_space(hdr);
1071 handle_from(mi, hdr);
1072 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1073 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1074 } else {
1075 cleanup_space(hdr);
1076 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1077 }
1078 }
1079 fprintf(mi->output, "\n");
1080}
1081
1082int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1083{
1084 FILE *cmitmsg;
1085 int peek;
1086 struct strbuf line = STRBUF_INIT;
1087
1088 cmitmsg = fopen(msg, "w");
1089 if (!cmitmsg) {
1090 perror(msg);
1091 return -1;
1092 }
1093 mi->patchfile = fopen(patch, "w");
1094 if (!mi->patchfile) {
1095 perror(patch);
1096 fclose(cmitmsg);
1097 return -1;
1098 }
1099
1100 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1101 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1102
1103 do {
1104 peek = fgetc(mi->input);
f0733c13
JS
1105 if (peek == EOF) {
1106 fclose(cmitmsg);
1107 return error("empty patch: '%s'", patch);
1108 }
c6905e45
JH
1109 } while (isspace(peek));
1110 ungetc(peek, mi->input);
1111
1112 /* process the email header */
1113 while (read_one_header_line(&line, mi->input))
1114 check_header(mi, &line, mi->p_hdr_data, 1);
1115
1116 handle_body(mi, &line);
1117 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1118 fclose(cmitmsg);
1119 fclose(mi->patchfile);
1120
1121 handle_info(mi);
1122 strbuf_release(&line);
6ac617a3 1123 return mi->input_error;
c6905e45
JH
1124}
1125
1126static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1127{
1128 struct mailinfo *mi = mi_;
1129
1130 if (!starts_with(var, "mailinfo."))
1131 return git_default_config(var, value, NULL);
1132 if (!strcmp(var, "mailinfo.scissors")) {
1133 mi->use_scissors = git_config_bool(var, value);
1134 return 0;
1135 }
1136 /* perhaps others here */
1137 return 0;
1138}
1139
1140void setup_mailinfo(struct mailinfo *mi)
1141{
1142 memset(mi, 0, sizeof(*mi));
1143 strbuf_init(&mi->name, 0);
1144 strbuf_init(&mi->email, 0);
1145 strbuf_init(&mi->charset, 0);
1146 strbuf_init(&mi->log_message, 0);
6b4b013f 1147 strbuf_init(&mi->inbody_header_accum, 0);
c6905e45
JH
1148 mi->header_stage = 1;
1149 mi->use_inbody_headers = 1;
1150 mi->content_top = mi->content;
85d9d9dd 1151 git_config(git_mailinfo_config, mi);
c6905e45
JH
1152}
1153
1154void clear_mailinfo(struct mailinfo *mi)
1155{
1156 int i;
1157
1158 strbuf_release(&mi->name);
1159 strbuf_release(&mi->email);
1160 strbuf_release(&mi->charset);
6b4b013f 1161 strbuf_release(&mi->inbody_header_accum);
c6905e45
JH
1162 free(mi->message_id);
1163
1164 for (i = 0; mi->p_hdr_data[i]; i++)
1165 strbuf_release(mi->p_hdr_data[i]);
1166 free(mi->p_hdr_data);
1167 for (i = 0; mi->s_hdr_data[i]; i++)
1168 strbuf_release(mi->s_hdr_data[i]);
1169 free(mi->s_hdr_data);
1170
1171 while (mi->content < mi->content_top) {
1172 free(*(mi->content_top));
1173 mi->content_top--;
1174 }
1175
1176 strbuf_release(&mi->log_message);
1177}