strbuf: introduce strbuf_getline_{lf,nul}()
[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
57static void handle_from(struct mailinfo *mi, const struct strbuf *from)
58{
59 char *at;
60 size_t el;
61 struct strbuf f;
62
63 strbuf_init(&f, from->len);
64 strbuf_addbuf(&f, from);
65
66 at = strchr(f.buf, '@');
67 if (!at) {
68 parse_bogus_from(mi, from);
69 return;
70 }
71
72 /*
73 * If we already have one email, don't take any confusing lines
74 */
75 if (mi->email.len && strchr(at + 1, '@')) {
76 strbuf_release(&f);
77 return;
78 }
79
80 /* Pick up the string around '@', possibly delimited with <>
81 * pair; that is the email part.
82 */
83 while (at > f.buf) {
84 char c = at[-1];
85 if (isspace(c))
86 break;
87 if (c == '<') {
88 at[-1] = ' ';
89 break;
90 }
91 at--;
92 }
93 el = strcspn(at, " \n\t\r\v\f>");
94 strbuf_reset(&mi->email);
95 strbuf_add(&mi->email, at, el);
96 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
97
98 /* The remainder is name. It could be
99 *
100 * - "John Doe <john.doe@xz>" (a), or
101 * - "john.doe@xz (John Doe)" (b), or
102 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
103 *
104 * but we have removed the email part, so
105 *
106 * - remove extra spaces which could stay after email (case 'c'), and
107 * - trim from both ends, possibly removing the () pair at the end
108 * (cases 'a' and 'b').
109 */
110 cleanup_space(&f);
111 strbuf_trim(&f);
112 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
113 strbuf_remove(&f, 0, 1);
114 strbuf_setlen(&f, f.len - 1);
115 }
116
117 get_sane_name(&mi->name, &f, &mi->email);
118 strbuf_release(&f);
119}
120
121static void handle_header(struct strbuf **out, const struct strbuf *line)
122{
123 if (!*out) {
124 *out = xmalloc(sizeof(struct strbuf));
125 strbuf_init(*out, line->len);
126 } else
127 strbuf_reset(*out);
128
129 strbuf_addbuf(*out, line);
130}
131
132/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
133 * to have enough heuristics to grok MIME encoded patches often found
134 * on our mailing lists. For example, we do not even treat header lines
135 * case insensitively.
136 */
137
138static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
139{
140 const char *ends, *ap = strcasestr(line, name);
141 size_t sz;
142
143 strbuf_setlen(attr, 0);
144 if (!ap)
145 return 0;
146 ap += strlen(name);
147 if (*ap == '"') {
148 ap++;
149 ends = "\"";
150 }
151 else
152 ends = "; \t";
153 sz = strcspn(ap, ends);
154 strbuf_add(attr, ap, sz);
155 return 1;
156}
157
158static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
159{
160 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
161 strbuf_init(boundary, line->len);
162
163 if (slurp_attr(line->buf, "boundary=", boundary)) {
164 strbuf_insert(boundary, 0, "--", 2);
165 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
6ac617a3
JH
166 error("Too many boundaries to handle");
167 mi->input_error = -1;
168 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
169 return;
c6905e45
JH
170 }
171 *(mi->content_top) = boundary;
172 boundary = NULL;
173 }
174 slurp_attr(line->buf, "charset=", &mi->charset);
175
176 if (boundary) {
177 strbuf_release(boundary);
178 free(boundary);
179 }
180}
181
182static void handle_message_id(struct mailinfo *mi, const struct strbuf *line)
183{
184 if (mi->add_message_id)
185 mi->message_id = strdup(line->buf);
186}
187
188static void handle_content_transfer_encoding(struct mailinfo *mi,
189 const struct strbuf *line)
190{
191 if (strcasestr(line->buf, "base64"))
192 mi->transfer_encoding = TE_BASE64;
193 else if (strcasestr(line->buf, "quoted-printable"))
194 mi->transfer_encoding = TE_QP;
195 else
196 mi->transfer_encoding = TE_DONTCARE;
197}
198
199static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
200{
201 struct strbuf *content_top = *(mi->content_top);
202
203 return ((content_top->len <= line->len) &&
204 !memcmp(line->buf, content_top->buf, content_top->len));
205}
206
207static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
208{
209 size_t at = 0;
210
211 while (at < subject->len) {
212 char *pos;
213 size_t remove;
214
215 switch (subject->buf[at]) {
216 case 'r': case 'R':
217 if (subject->len <= at + 3)
218 break;
219 if ((subject->buf[at + 1] == 'e' ||
220 subject->buf[at + 1] == 'E') &&
221 subject->buf[at + 2] == ':') {
222 strbuf_remove(subject, at, 3);
223 continue;
224 }
225 at++;
226 break;
227 case ' ': case '\t': case ':':
228 strbuf_remove(subject, at, 1);
229 continue;
230 case '[':
231 pos = strchr(subject->buf + at, ']');
232 if (!pos)
233 break;
234 remove = pos - subject->buf + at + 1;
235 if (!mi->keep_non_patch_brackets_in_subject ||
236 (7 <= remove &&
237 memmem(subject->buf + at, remove, "PATCH", 5)))
238 strbuf_remove(subject, at, remove);
239 else {
240 at += remove;
241 /*
242 * If the input had a space after the ], keep
243 * it. We don't bother with finding the end of
244 * the space, since we later normalize it
245 * anyway.
246 */
247 if (isspace(subject->buf[at]))
248 at += 1;
249 }
250 continue;
251 }
252 break;
253 }
254 strbuf_trim(subject);
255}
256
257#define MAX_HDR_PARSED 10
258static const char *header[MAX_HDR_PARSED] = {
259 "From","Subject","Date",
260};
261
262static inline int cmp_header(const struct strbuf *line, const char *hdr)
263{
264 int len = strlen(hdr);
265 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
266 line->buf[len] == ':' && isspace(line->buf[len + 1]);
267}
268
269static int is_format_patch_separator(const char *line, int len)
270{
271 static const char SAMPLE[] =
272 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
273 const char *cp;
274
275 if (len != strlen(SAMPLE))
276 return 0;
277 if (!skip_prefix(line, "From ", &cp))
278 return 0;
279 if (strspn(cp, "0123456789abcdef") != 40)
280 return 0;
281 cp += 40;
282 return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
283}
284
285static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
286{
287 const char *in = q_seg->buf;
288 int c;
289 struct strbuf *out = xmalloc(sizeof(struct strbuf));
290 strbuf_init(out, q_seg->len);
291
292 while ((c = *in++) != 0) {
293 if (c == '=') {
294 int d = *in++;
295 if (d == '\n' || !d)
296 break; /* drop trailing newline */
297 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
298 continue;
299 }
300 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
301 c = 0x20;
302 strbuf_addch(out, c);
303 }
304 return out;
305}
306
307static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
308{
309 /* Decode in..ep, possibly in-place to ot */
310 int c, pos = 0, acc = 0;
311 const char *in = b_seg->buf;
312 struct strbuf *out = xmalloc(sizeof(struct strbuf));
313 strbuf_init(out, b_seg->len);
314
315 while ((c = *in++) != 0) {
316 if (c == '+')
317 c = 62;
318 else if (c == '/')
319 c = 63;
320 else if ('A' <= c && c <= 'Z')
321 c -= 'A';
322 else if ('a' <= c && c <= 'z')
323 c -= 'a' - 26;
324 else if ('0' <= c && c <= '9')
325 c -= '0' - 52;
326 else
327 continue; /* garbage */
328 switch (pos++) {
329 case 0:
330 acc = (c << 2);
331 break;
332 case 1:
333 strbuf_addch(out, (acc | (c >> 4)));
334 acc = (c & 15) << 4;
335 break;
336 case 2:
337 strbuf_addch(out, (acc | (c >> 2)));
338 acc = (c & 3) << 6;
339 break;
340 case 3:
341 strbuf_addch(out, (acc | c));
342 acc = pos = 0;
343 break;
344 }
345 }
346 return out;
347}
348
669b963a
JH
349static int convert_to_utf8(struct mailinfo *mi,
350 struct strbuf *line, const char *charset)
c6905e45
JH
351{
352 char *out;
353
354 if (!mi->metainfo_charset || !charset || !*charset)
669b963a 355 return 0;
c6905e45
JH
356
357 if (same_encoding(mi->metainfo_charset, charset))
669b963a 358 return 0;
c6905e45 359 out = reencode_string(line->buf, mi->metainfo_charset, charset);
6ac617a3
JH
360 if (!out) {
361 mi->input_error = -1;
669b963a
JH
362 return error("cannot convert from %s to %s",
363 charset, mi->metainfo_charset);
6ac617a3 364 }
c6905e45 365 strbuf_attach(line, out, strlen(out), strlen(out));
669b963a 366 return 0;
c6905e45
JH
367}
368
369static void decode_header(struct mailinfo *mi, struct strbuf *it)
370{
371 char *in, *ep, *cp;
372 struct strbuf outbuf = STRBUF_INIT, *dec;
373 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
6ac617a3 374 int found_error = 1; /* pessimism */
c6905e45
JH
375
376 in = it->buf;
377 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
378 int encoding;
379 strbuf_reset(&charset_q);
380 strbuf_reset(&piecebuf);
381
382 if (in != ep) {
383 /*
384 * We are about to process an encoded-word
385 * that begins at ep, but there is something
386 * before the encoded word.
387 */
388 char *scan;
389 for (scan = in; scan < ep; scan++)
390 if (!isspace(*scan))
391 break;
392
393 if (scan != ep || in == it->buf) {
394 /*
395 * We should not lose that "something",
396 * unless we have just processed an
397 * encoded-word, and there is only LWS
398 * before the one we are about to process.
399 */
400 strbuf_add(&outbuf, in, ep - in);
401 }
402 }
403 /* E.g.
404 * ep : "=?iso-2022-jp?B?GyR...?= foo"
405 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
406 */
407 ep += 2;
408
409 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
410 goto release_return;
411
412 if (cp + 3 - it->buf > it->len)
413 goto release_return;
414 strbuf_add(&charset_q, ep, cp - ep);
415
416 encoding = cp[1];
417 if (!encoding || cp[2] != '?')
418 goto release_return;
419 ep = strstr(cp + 3, "?=");
420 if (!ep)
421 goto release_return;
422 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
423 switch (tolower(encoding)) {
424 default:
425 goto release_return;
426 case 'b':
427 dec = decode_b_segment(&piecebuf);
428 break;
429 case 'q':
430 dec = decode_q_segment(&piecebuf, 1);
431 break;
432 }
669b963a
JH
433 if (convert_to_utf8(mi, dec, charset_q.buf))
434 goto release_return;
c6905e45
JH
435
436 strbuf_addbuf(&outbuf, dec);
437 strbuf_release(dec);
438 free(dec);
439 in = ep + 2;
440 }
441 strbuf_addstr(&outbuf, in);
442 strbuf_reset(it);
443 strbuf_addbuf(it, &outbuf);
6ac617a3 444 found_error = 0;
c6905e45
JH
445release_return:
446 strbuf_release(&outbuf);
447 strbuf_release(&charset_q);
448 strbuf_release(&piecebuf);
6ac617a3
JH
449
450 if (found_error)
451 mi->input_error = -1;
c6905e45
JH
452}
453
454static int check_header(struct mailinfo *mi,
455 const struct strbuf *line,
456 struct strbuf *hdr_data[], int overwrite)
457{
458 int i, ret = 0, len;
459 struct strbuf sb = STRBUF_INIT;
460
461 /* search for the interesting parts */
462 for (i = 0; header[i]; i++) {
463 int len = strlen(header[i]);
464 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
465 /* Unwrap inline B and Q encoding, and optionally
466 * normalize the meta information to utf8.
467 */
468 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
469 decode_header(mi, &sb);
470 handle_header(&hdr_data[i], &sb);
471 ret = 1;
472 goto check_header_out;
473 }
474 }
475
476 /* Content stuff */
477 if (cmp_header(line, "Content-Type")) {
478 len = strlen("Content-Type: ");
479 strbuf_add(&sb, line->buf + len, line->len - len);
480 decode_header(mi, &sb);
481 strbuf_insert(&sb, 0, "Content-Type: ", len);
482 handle_content_type(mi, &sb);
483 ret = 1;
484 goto check_header_out;
485 }
486 if (cmp_header(line, "Content-Transfer-Encoding")) {
487 len = strlen("Content-Transfer-Encoding: ");
488 strbuf_add(&sb, line->buf + len, line->len - len);
489 decode_header(mi, &sb);
490 handle_content_transfer_encoding(mi, &sb);
491 ret = 1;
492 goto check_header_out;
493 }
494 if (cmp_header(line, "Message-Id")) {
495 len = strlen("Message-Id: ");
496 strbuf_add(&sb, line->buf + len, line->len - len);
497 decode_header(mi, &sb);
498 handle_message_id(mi, &sb);
499 ret = 1;
500 goto check_header_out;
501 }
502
503 /* for inbody stuff */
504 if (starts_with(line->buf, ">From") && isspace(line->buf[5])) {
505 ret = is_format_patch_separator(line->buf + 1, line->len - 1);
506 goto check_header_out;
507 }
508 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
509 for (i = 0; header[i]; i++) {
510 if (!strcmp("Subject", header[i])) {
511 handle_header(&hdr_data[i], line);
512 ret = 1;
513 goto check_header_out;
514 }
515 }
516 }
517
518check_header_out:
519 strbuf_release(&sb);
520 return ret;
521}
522
523static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
524{
525 struct strbuf *ret;
526
527 switch (mi->transfer_encoding) {
528 case TE_QP:
529 ret = decode_q_segment(line, 0);
530 break;
531 case TE_BASE64:
532 ret = decode_b_segment(line);
533 break;
534 case TE_DONTCARE:
535 default:
536 return;
537 }
538 strbuf_reset(line);
539 strbuf_addbuf(line, ret);
540 strbuf_release(ret);
541 free(ret);
542}
543
544static inline int patchbreak(const struct strbuf *line)
545{
546 size_t i;
547
548 /* Beginning of a "diff -" header? */
549 if (starts_with(line->buf, "diff -"))
550 return 1;
551
552 /* CVS "Index: " line? */
553 if (starts_with(line->buf, "Index: "))
554 return 1;
555
556 /*
557 * "--- <filename>" starts patches without headers
558 * "---<sp>*" is a manual separator
559 */
560 if (line->len < 4)
561 return 0;
562
563 if (starts_with(line->buf, "---")) {
564 /* space followed by a filename? */
565 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
566 return 1;
567 /* Just whitespace? */
568 for (i = 3; i < line->len; i++) {
569 unsigned char c = line->buf[i];
570 if (c == '\n')
571 return 1;
572 if (!isspace(c))
573 break;
574 }
575 return 0;
576 }
577 return 0;
578}
579
580static int is_scissors_line(const struct strbuf *line)
581{
582 size_t i, len = line->len;
583 int scissors = 0, gap = 0;
584 int first_nonblank = -1;
585 int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
586 const char *buf = line->buf;
587
588 for (i = 0; i < len; i++) {
589 if (isspace(buf[i])) {
590 if (in_perforation) {
591 perforation++;
592 gap++;
593 }
594 continue;
595 }
596 last_nonblank = i;
597 if (first_nonblank < 0)
598 first_nonblank = i;
599 if (buf[i] == '-') {
600 in_perforation = 1;
601 perforation++;
602 continue;
603 }
604 if (i + 1 < len &&
605 (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
606 !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
607 in_perforation = 1;
608 perforation += 2;
609 scissors += 2;
610 i++;
611 continue;
612 }
613 in_perforation = 0;
614 }
615
616 /*
617 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
618 * Even though there can be arbitrary cruft on the same line
619 * (e.g. "cut here"), in order to avoid misidentification, the
620 * perforation must occupy more than a third of the visible
621 * width of the line, and dashes and scissors must occupy more
622 * than half of the perforation.
623 */
624
625 visible = last_nonblank - first_nonblank + 1;
626 return (scissors && 8 <= visible &&
627 visible < perforation * 3 &&
628 gap * 2 < perforation);
629}
630
631static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
632{
633 assert(!mi->filter_stage);
634
635 if (mi->header_stage) {
636 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
637 return 0;
638 }
639
640 if (mi->use_inbody_headers && mi->header_stage) {
641 mi->header_stage = check_header(mi, line, mi->s_hdr_data, 0);
642 if (mi->header_stage)
643 return 0;
644 } else
645 /* Only trim the first (blank) line of the commit message
646 * when ignoring in-body headers.
647 */
648 mi->header_stage = 0;
649
650 /* normalize the log message to UTF-8. */
669b963a 651 if (convert_to_utf8(mi, line, mi->charset.buf))
6ac617a3 652 return 0; /* mi->input_error already set */
c6905e45
JH
653
654 if (mi->use_scissors && is_scissors_line(line)) {
655 int i;
656
657 strbuf_setlen(&mi->log_message, 0);
658 mi->header_stage = 1;
659
660 /*
661 * We may have already read "secondary headers"; purge
662 * them to give ourselves a clean restart.
663 */
664 for (i = 0; header[i]; i++) {
665 if (mi->s_hdr_data[i])
666 strbuf_release(mi->s_hdr_data[i]);
667 mi->s_hdr_data[i] = NULL;
668 }
669 return 0;
670 }
671
672 if (patchbreak(line)) {
673 if (mi->message_id)
674 strbuf_addf(&mi->log_message,
675 "Message-Id: %s\n", mi->message_id);
676 return 1;
677 }
678
679 strbuf_addbuf(&mi->log_message, line);
680 return 0;
681}
682
683static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
684{
685 fwrite(line->buf, 1, line->len, mi->patchfile);
686 mi->patch_lines++;
687}
688
689static void handle_filter(struct mailinfo *mi, struct strbuf *line)
690{
691 switch (mi->filter_stage) {
692 case 0:
693 if (!handle_commit_msg(mi, line))
694 break;
695 mi->filter_stage++;
696 case 1:
697 handle_patch(mi, line);
698 break;
699 }
700}
701
702static int is_rfc2822_header(const struct strbuf *line)
703{
704 /*
705 * The section that defines the loosest possible
706 * field name is "3.6.8 Optional fields".
707 *
708 * optional-field = field-name ":" unstructured CRLF
709 * field-name = 1*ftext
710 * ftext = %d33-57 / %59-126
711 */
712 int ch;
713 char *cp = line->buf;
714
715 /* Count mbox From headers as headers */
716 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
717 return 1;
718
719 while ((ch = *cp++)) {
720 if (ch == ':')
721 return 1;
722 if ((33 <= ch && ch <= 57) ||
723 (59 <= ch && ch <= 126))
724 continue;
725 break;
726 }
727 return 0;
728}
729
730static int read_one_header_line(struct strbuf *line, FILE *in)
731{
732 struct strbuf continuation = STRBUF_INIT;
733
734 /* Get the first part of the line. */
8f309aeb 735 if (strbuf_getline_lf(line, in))
c6905e45
JH
736 return 0;
737
738 /*
739 * Is it an empty line or not a valid rfc2822 header?
740 * If so, stop here, and return false ("not a header")
741 */
742 strbuf_rtrim(line);
743 if (!line->len || !is_rfc2822_header(line)) {
744 /* Re-add the newline */
745 strbuf_addch(line, '\n');
746 return 0;
747 }
748
749 /*
750 * Now we need to eat all the continuation lines..
751 * Yuck, 2822 header "folding"
752 */
753 for (;;) {
754 int peek;
755
756 peek = fgetc(in); ungetc(peek, in);
757 if (peek != ' ' && peek != '\t')
758 break;
8f309aeb 759 if (strbuf_getline_lf(&continuation, in))
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760 break;
761 continuation.buf[0] = ' ';
762 strbuf_rtrim(&continuation);
763 strbuf_addbuf(line, &continuation);
764 }
765 strbuf_release(&continuation);
766
767 return 1;
768}
769
770static int find_boundary(struct mailinfo *mi, struct strbuf *line)
771{
8f309aeb 772 while (!strbuf_getline_lf(line, mi->input)) {
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773 if (*(mi->content_top) && is_multipart_boundary(mi, line))
774 return 1;
775 }
776 return 0;
777}
778
779static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
780{
781 struct strbuf newline = STRBUF_INIT;
782
783 strbuf_addch(&newline, '\n');
784again:
785 if (line->len >= (*(mi->content_top))->len + 2 &&
786 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
787 /* we hit an end boundary */
788 /* pop the current boundary off the stack */
789 strbuf_release(*(mi->content_top));
790 free(*(mi->content_top));
791 *(mi->content_top) = NULL;
792
793 /* technically won't happen as is_multipart_boundary()
794 will fail first. But just in case..
795 */
796 if (--mi->content_top < mi->content) {
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797 error("Detected mismatched boundaries, can't recover");
798 mi->input_error = -1;
799 mi->content_top = mi->content;
800 return 0;
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801 }
802 handle_filter(mi, &newline);
803 strbuf_release(&newline);
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804 if (mi->input_error)
805 return 0;
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806
807 /* skip to the next boundary */
808 if (!find_boundary(mi, line))
809 return 0;
810 goto again;
811 }
812
813 /* set some defaults */
814 mi->transfer_encoding = TE_DONTCARE;
815 strbuf_reset(&mi->charset);
816
817 /* slurp in this section's info */
818 while (read_one_header_line(line, mi->input))
819 check_header(mi, line, mi->p_hdr_data, 0);
820
821 strbuf_release(&newline);
822 /* replenish line */
8f309aeb 823 if (strbuf_getline_lf(line, mi->input))
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824 return 0;
825 strbuf_addch(line, '\n');
826 return 1;
827}
828
829static void handle_body(struct mailinfo *mi, struct strbuf *line)
830{
831 struct strbuf prev = STRBUF_INIT;
832
833 /* Skip up to the first boundary */
834 if (*(mi->content_top)) {
835 if (!find_boundary(mi, line))
836 goto handle_body_out;
837 }
838
839 do {
840 /* process any boundary lines */
841 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
842 /* flush any leftover */
843 if (prev.len) {
844 handle_filter(mi, &prev);
845 strbuf_reset(&prev);
846 }
847 if (!handle_boundary(mi, line))
848 goto handle_body_out;
849 }
850
851 /* Unwrap transfer encoding */
852 decode_transfer_encoding(mi, line);
853
854 switch (mi->transfer_encoding) {
855 case TE_BASE64:
856 case TE_QP:
857 {
858 struct strbuf **lines, **it, *sb;
859
860 /* Prepend any previous partial lines */
861 strbuf_insert(line, 0, prev.buf, prev.len);
862 strbuf_reset(&prev);
863
864 /*
865 * This is a decoded line that may contain
866 * multiple new lines. Pass only one chunk
867 * at a time to handle_filter()
868 */
869 lines = strbuf_split(line, '\n');
870 for (it = lines; (sb = *it); it++) {
871 if (*(it + 1) == NULL) /* The last line */
872 if (sb->buf[sb->len - 1] != '\n') {
873 /* Partial line, save it for later. */
874 strbuf_addbuf(&prev, sb);
875 break;
876 }
877 handle_filter(mi, sb);
878 }
879 /*
880 * The partial chunk is saved in "prev" and will be
881 * appended by the next iteration of read_line_with_nul().
882 */
883 strbuf_list_free(lines);
884 break;
885 }
886 default:
887 handle_filter(mi, line);
888 }
889
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890 if (mi->input_error)
891 break;
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892 } while (!strbuf_getwholeline(line, mi->input, '\n'));
893
894handle_body_out:
895 strbuf_release(&prev);
896}
897
898static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
899{
900 const char *sp = data->buf;
901 while (1) {
902 char *ep = strchr(sp, '\n');
903 int len;
904 if (!ep)
905 len = strlen(sp);
906 else
907 len = ep - sp;
908 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
909 if (!ep)
910 break;
911 sp = ep + 1;
912 }
913}
914
915static void handle_info(struct mailinfo *mi)
916{
917 struct strbuf *hdr;
918 int i;
919
920 for (i = 0; header[i]; i++) {
921 /* only print inbody headers if we output a patch file */
922 if (mi->patch_lines && mi->s_hdr_data[i])
923 hdr = mi->s_hdr_data[i];
924 else if (mi->p_hdr_data[i])
925 hdr = mi->p_hdr_data[i];
926 else
927 continue;
928
929 if (!strcmp(header[i], "Subject")) {
930 if (!mi->keep_subject) {
931 cleanup_subject(mi, hdr);
932 cleanup_space(hdr);
933 }
934 output_header_lines(mi->output, "Subject", hdr);
935 } else if (!strcmp(header[i], "From")) {
936 cleanup_space(hdr);
937 handle_from(mi, hdr);
938 fprintf(mi->output, "Author: %s\n", mi->name.buf);
939 fprintf(mi->output, "Email: %s\n", mi->email.buf);
940 } else {
941 cleanup_space(hdr);
942 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
943 }
944 }
945 fprintf(mi->output, "\n");
946}
947
948int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
949{
950 FILE *cmitmsg;
951 int peek;
952 struct strbuf line = STRBUF_INIT;
953
954 cmitmsg = fopen(msg, "w");
955 if (!cmitmsg) {
956 perror(msg);
957 return -1;
958 }
959 mi->patchfile = fopen(patch, "w");
960 if (!mi->patchfile) {
961 perror(patch);
962 fclose(cmitmsg);
963 return -1;
964 }
965
966 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
967 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
968
969 do {
970 peek = fgetc(mi->input);
971 } while (isspace(peek));
972 ungetc(peek, mi->input);
973
974 /* process the email header */
975 while (read_one_header_line(&line, mi->input))
976 check_header(mi, &line, mi->p_hdr_data, 1);
977
978 handle_body(mi, &line);
979 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
980 fclose(cmitmsg);
981 fclose(mi->patchfile);
982
983 handle_info(mi);
984 strbuf_release(&line);
6ac617a3 985 return mi->input_error;
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986}
987
988static int git_mailinfo_config(const char *var, const char *value, void *mi_)
989{
990 struct mailinfo *mi = mi_;
991
992 if (!starts_with(var, "mailinfo."))
993 return git_default_config(var, value, NULL);
994 if (!strcmp(var, "mailinfo.scissors")) {
995 mi->use_scissors = git_config_bool(var, value);
996 return 0;
997 }
998 /* perhaps others here */
999 return 0;
1000}
1001
1002void setup_mailinfo(struct mailinfo *mi)
1003{
1004 memset(mi, 0, sizeof(*mi));
1005 strbuf_init(&mi->name, 0);
1006 strbuf_init(&mi->email, 0);
1007 strbuf_init(&mi->charset, 0);
1008 strbuf_init(&mi->log_message, 0);
1009 mi->header_stage = 1;
1010 mi->use_inbody_headers = 1;
1011 mi->content_top = mi->content;
85d9d9dd 1012 git_config(git_mailinfo_config, mi);
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1013}
1014
1015void clear_mailinfo(struct mailinfo *mi)
1016{
1017 int i;
1018
1019 strbuf_release(&mi->name);
1020 strbuf_release(&mi->email);
1021 strbuf_release(&mi->charset);
1022 free(mi->message_id);
1023
1024 for (i = 0; mi->p_hdr_data[i]; i++)
1025 strbuf_release(mi->p_hdr_data[i]);
1026 free(mi->p_hdr_data);
1027 for (i = 0; mi->s_hdr_data[i]; i++)
1028 strbuf_release(mi->s_hdr_data[i]);
1029 free(mi->s_hdr_data);
1030
1031 while (mi->content < mi->content_top) {
1032 free(*(mi->content_top));
1033 mi->content_top--;
1034 }
1035
1036 strbuf_release(&mi->log_message);
1037}