Documentation/stash: remove mention of git reset --hard
[git.git] / mailinfo.c
bloba489d9d0fbcc37a1198247a8daae4b3104ebe284
1 #include "cache.h"
2 #include "utf8.h"
3 #include "strbuf.h"
4 #include "mailinfo.h"
6 static void cleanup_space(struct strbuf *sb)
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);
18 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
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);
30 static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
32 /* John Doe <johndoe> */
34 char *bra, *ket;
35 /* This is fallback, so do not bother if we already have an
36 * e-mail address.
38 if (mi->email.len)
39 return;
41 bra = strchr(line->buf, '<');
42 if (!bra)
43 return;
44 ket = strchr(bra, '>');
45 if (!ket)
46 return;
48 strbuf_reset(&mi->email);
49 strbuf_add(&mi->email, bra + 1, ket - bra - 1);
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);
57 static const char *unquote_comment(struct strbuf *outbuf, const char *in)
59 int c;
60 int take_next_litterally = 0;
62 strbuf_addch(outbuf, '(');
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;
81 strbuf_addch(outbuf, c);
84 return in;
87 static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
89 int c;
90 int take_next_litterally = 0;
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;
105 strbuf_addch(outbuf, c);
108 return in;
111 static void unquote_quoted_pair(struct strbuf *line)
113 struct strbuf outbuf;
114 const char *in = line->buf;
115 int c;
117 strbuf_init(&outbuf, line->len);
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;
129 strbuf_addch(&outbuf, c);
132 strbuf_swap(&outbuf, line);
133 strbuf_release(&outbuf);
137 static void handle_from(struct mailinfo *mi, const struct strbuf *from)
139 char *at;
140 size_t el;
141 struct strbuf f;
143 strbuf_init(&f, from->len);
144 strbuf_addbuf(&f, from);
146 unquote_quoted_pair(&f);
148 at = strchr(f.buf, '@');
149 if (!at) {
150 parse_bogus_from(mi, from);
151 return;
155 * If we already have one email, don't take any confusing lines
157 if (mi->email.len && strchr(at + 1, '@')) {
158 strbuf_release(&f);
159 return;
162 /* Pick up the string around '@', possibly delimited with <>
163 * pair; that is the email part.
165 while (at > f.buf) {
166 char c = at[-1];
167 if (isspace(c))
168 break;
169 if (c == '<') {
170 at[-1] = ' ';
171 break;
173 at--;
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));
180 /* The remainder is name. It could be
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)
186 * but we have removed the email part, so
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').
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);
199 get_sane_name(&mi->name, &f, &mi->email);
200 strbuf_release(&f);
203 static void handle_header(struct strbuf **out, const struct strbuf *line)
205 if (!*out) {
206 *out = xmalloc(sizeof(struct strbuf));
207 strbuf_init(*out, line->len);
208 } else
209 strbuf_reset(*out);
211 strbuf_addbuf(*out, line);
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.
220 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
222 const char *ends, *ap = strcasestr(line, name);
223 size_t sz;
225 strbuf_setlen(attr, 0);
226 if (!ap)
227 return 0;
228 ap += strlen(name);
229 if (*ap == '"') {
230 ap++;
231 ends = "\"";
233 else
234 ends = "; \t";
235 sz = strcspn(ap, ends);
236 strbuf_add(attr, ap, sz);
237 return 1;
240 static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
242 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
243 strbuf_init(boundary, line->len);
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;
253 *(mi->content_top) = boundary;
254 boundary = NULL;
256 slurp_attr(line->buf, "charset=", &mi->charset);
258 if (boundary) {
259 strbuf_release(boundary);
260 free(boundary);
264 static void handle_content_transfer_encoding(struct mailinfo *mi,
265 const struct strbuf *line)
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;
275 static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
277 struct strbuf *content_top = *(mi->content_top);
279 return ((content_top->len <= line->len) &&
280 !memcmp(line->buf, content_top->buf, content_top->len));
283 static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
285 size_t at = 0;
287 while (at < subject->len) {
288 char *pos;
289 size_t remove;
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;
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;
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.
323 if (isspace(subject->buf[at]))
324 at += 1;
326 continue;
328 break;
330 strbuf_trim(subject);
333 #define MAX_HDR_PARSED 10
334 static const char *header[MAX_HDR_PARSED] = {
335 "From","Subject","Date",
338 static inline int cmp_header(const struct strbuf *line, const char *hdr)
340 int len = strlen(hdr);
341 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
342 line->buf[len] == ':' && isspace(line->buf[len + 1]);
345 static int is_format_patch_separator(const char *line, int len)
347 static const char SAMPLE[] =
348 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
349 const char *cp;
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));
361 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
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);
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;
376 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
377 c = 0x20;
378 strbuf_addch(out, c);
380 return out;
383 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
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);
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;
422 return out;
425 static int convert_to_utf8(struct mailinfo *mi,
426 struct strbuf *line, const char *charset)
428 char *out;
430 if (!mi->metainfo_charset || !charset || !*charset)
431 return 0;
433 if (same_encoding(mi->metainfo_charset, charset))
434 return 0;
435 out = reencode_string(line->buf, mi->metainfo_charset, charset);
436 if (!out) {
437 mi->input_error = -1;
438 return error("cannot convert from %s to %s",
439 charset, mi->metainfo_charset);
441 strbuf_attach(line, out, strlen(out), strlen(out));
442 return 0;
445 static void decode_header(struct mailinfo *mi, struct strbuf *it)
447 char *in, *ep, *cp;
448 struct strbuf outbuf = STRBUF_INIT, *dec;
449 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
450 int found_error = 1; /* pessimism */
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);
458 if (in != ep) {
460 * We are about to process an encoded-word
461 * that begins at ep, but there is something
462 * before the encoded word.
464 char *scan;
465 for (scan = in; scan < ep; scan++)
466 if (!isspace(*scan))
467 break;
469 if (scan != ep || in == it->buf) {
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.
476 strbuf_add(&outbuf, in, ep - in);
479 /* E.g.
480 * ep : "=?iso-2022-jp?B?GyR...?= foo"
481 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
483 ep += 2;
485 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
486 goto release_return;
488 if (cp + 3 - it->buf > it->len)
489 goto release_return;
490 strbuf_add(&charset_q, ep, cp - ep);
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;
509 if (convert_to_utf8(mi, dec, charset_q.buf))
510 goto release_return;
512 strbuf_addbuf(&outbuf, dec);
513 strbuf_release(dec);
514 free(dec);
515 in = ep + 2;
517 strbuf_addstr(&outbuf, in);
518 strbuf_reset(it);
519 strbuf_addbuf(it, &outbuf);
520 found_error = 0;
521 release_return:
522 strbuf_release(&outbuf);
523 strbuf_release(&charset_q);
524 strbuf_release(&piecebuf);
526 if (found_error)
527 mi->input_error = -1;
530 static int check_header(struct mailinfo *mi,
531 const struct strbuf *line,
532 struct strbuf *hdr_data[], int overwrite)
534 int i, ret = 0, len;
535 struct strbuf sb = STRBUF_INIT;
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.
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;
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;
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;
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);
574 if (mi->add_message_id)
575 mi->message_id = strbuf_detach(&sb, NULL);
576 ret = 1;
577 goto check_header_out;
580 check_header_out:
581 strbuf_release(&sb);
582 return ret;
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).
590 static int is_inbody_header(const struct mailinfo *mi,
591 const struct strbuf *line)
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;
600 static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
602 struct strbuf *ret;
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;
615 strbuf_reset(line);
616 strbuf_addbuf(line, ret);
617 strbuf_release(ret);
618 free(ret);
621 static inline int patchbreak(const struct strbuf *line)
623 size_t i;
625 /* Beginning of a "diff -" header? */
626 if (starts_with(line->buf, "diff -"))
627 return 1;
629 /* CVS "Index: " line? */
630 if (starts_with(line->buf, "Index: "))
631 return 1;
634 * "--- <filename>" starts patches without headers
635 * "---<sp>*" is a manual separator
637 if (line->len < 4)
638 return 0;
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;
652 return 0;
654 return 0;
657 static int is_scissors_line(const char *line)
659 const char *c;
660 int scissors = 0, gap = 0;
661 const char *first_nonblank = NULL, *last_nonblank = NULL;
662 int visible, perforation = 0, in_perforation = 0;
664 for (c = line; *c; c++) {
665 if (isspace(*c)) {
666 if (in_perforation) {
667 perforation++;
668 gap++;
670 continue;
672 last_nonblank = c;
673 if (first_nonblank == NULL)
674 first_nonblank = c;
675 if (*c == '-') {
676 in_perforation = 1;
677 perforation++;
678 continue;
680 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
681 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
682 in_perforation = 1;
683 perforation += 2;
684 scissors += 2;
685 c++;
686 continue;
688 in_perforation = 0;
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.
700 if (first_nonblank && last_nonblank)
701 visible = last_nonblank - first_nonblank + 1;
702 else
703 visible = 0;
704 return (scissors && 8 <= visible &&
705 visible < perforation * 3 &&
706 gap * 2 < perforation);
709 static void flush_inbody_header_accum(struct mailinfo *mi)
711 if (!mi->inbody_header_accum.len)
712 return;
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");
715 strbuf_reset(&mi->inbody_header_accum);
718 static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
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)) {
724 * This is a scissors line; do not consider this line
725 * as a header continuation line.
727 flush_inbody_header_accum(mi);
728 return 0;
730 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
731 strbuf_addbuf(&mi->inbody_header_accum, line);
732 return 1;
735 flush_inbody_header_accum(mi);
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;
746 return 0;
748 if (is_inbody_header(mi, line)) {
749 strbuf_addbuf(&mi->inbody_header_accum, line);
750 return 1;
752 return 0;
755 static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
757 assert(!mi->filter_stage);
759 if (mi->header_stage) {
760 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
761 return 0;
764 if (mi->use_inbody_headers && mi->header_stage) {
765 mi->header_stage = check_inbody_header(mi, line);
766 if (mi->header_stage)
767 return 0;
768 } else
769 /* Only trim the first (blank) line of the commit message
770 * when ignoring in-body headers.
772 mi->header_stage = 0;
774 /* normalize the log message to UTF-8. */
775 if (convert_to_utf8(mi, line, mi->charset.buf))
776 return 0; /* mi->input_error already set */
778 if (mi->use_scissors && is_scissors_line(line->buf)) {
779 int i;
781 strbuf_setlen(&mi->log_message, 0);
782 mi->header_stage = 1;
785 * We may have already read "secondary headers"; purge
786 * them to give ourselves a clean restart.
788 for (i = 0; header[i]; i++) {
789 if (mi->s_hdr_data[i])
790 strbuf_release(mi->s_hdr_data[i]);
791 mi->s_hdr_data[i] = NULL;
793 return 0;
796 if (patchbreak(line)) {
797 if (mi->message_id)
798 strbuf_addf(&mi->log_message,
799 "Message-Id: %s\n", mi->message_id);
800 return 1;
803 strbuf_addbuf(&mi->log_message, line);
804 return 0;
807 static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
809 fwrite(line->buf, 1, line->len, mi->patchfile);
810 mi->patch_lines++;
813 static void handle_filter(struct mailinfo *mi, struct strbuf *line)
815 switch (mi->filter_stage) {
816 case 0:
817 if (!handle_commit_msg(mi, line))
818 break;
819 mi->filter_stage++;
820 case 1:
821 handle_patch(mi, line);
822 break;
826 static int is_rfc2822_header(const struct strbuf *line)
829 * The section that defines the loosest possible
830 * field name is "3.6.8 Optional fields".
832 * optional-field = field-name ":" unstructured CRLF
833 * field-name = 1*ftext
834 * ftext = %d33-57 / %59-126
836 int ch;
837 char *cp = line->buf;
839 /* Count mbox From headers as headers */
840 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
841 return 1;
843 while ((ch = *cp++)) {
844 if (ch == ':')
845 return 1;
846 if ((33 <= ch && ch <= 57) ||
847 (59 <= ch && ch <= 126))
848 continue;
849 break;
851 return 0;
854 static int read_one_header_line(struct strbuf *line, FILE *in)
856 struct strbuf continuation = STRBUF_INIT;
858 /* Get the first part of the line. */
859 if (strbuf_getline_lf(line, in))
860 return 0;
863 * Is it an empty line or not a valid rfc2822 header?
864 * If so, stop here, and return false ("not a header")
866 strbuf_rtrim(line);
867 if (!line->len || !is_rfc2822_header(line)) {
868 /* Re-add the newline */
869 strbuf_addch(line, '\n');
870 return 0;
874 * Now we need to eat all the continuation lines..
875 * Yuck, 2822 header "folding"
877 for (;;) {
878 int peek;
880 peek = fgetc(in); ungetc(peek, in);
881 if (peek != ' ' && peek != '\t')
882 break;
883 if (strbuf_getline_lf(&continuation, in))
884 break;
885 continuation.buf[0] = ' ';
886 strbuf_rtrim(&continuation);
887 strbuf_addbuf(line, &continuation);
889 strbuf_release(&continuation);
891 return 1;
894 static int find_boundary(struct mailinfo *mi, struct strbuf *line)
896 while (!strbuf_getline_lf(line, mi->input)) {
897 if (*(mi->content_top) && is_multipart_boundary(mi, line))
898 return 1;
900 return 0;
903 static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
905 struct strbuf newline = STRBUF_INIT;
907 strbuf_addch(&newline, '\n');
908 again:
909 if (line->len >= (*(mi->content_top))->len + 2 &&
910 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
911 /* we hit an end boundary */
912 /* pop the current boundary off the stack */
913 strbuf_release(*(mi->content_top));
914 free(*(mi->content_top));
915 *(mi->content_top) = NULL;
917 /* technically won't happen as is_multipart_boundary()
918 will fail first. But just in case..
920 if (--mi->content_top < mi->content) {
921 error("Detected mismatched boundaries, can't recover");
922 mi->input_error = -1;
923 mi->content_top = mi->content;
924 return 0;
926 handle_filter(mi, &newline);
927 strbuf_release(&newline);
928 if (mi->input_error)
929 return 0;
931 /* skip to the next boundary */
932 if (!find_boundary(mi, line))
933 return 0;
934 goto again;
937 /* set some defaults */
938 mi->transfer_encoding = TE_DONTCARE;
939 strbuf_reset(&mi->charset);
941 /* slurp in this section's info */
942 while (read_one_header_line(line, mi->input))
943 check_header(mi, line, mi->p_hdr_data, 0);
945 strbuf_release(&newline);
946 /* replenish line */
947 if (strbuf_getline_lf(line, mi->input))
948 return 0;
949 strbuf_addch(line, '\n');
950 return 1;
953 static void handle_body(struct mailinfo *mi, struct strbuf *line)
955 struct strbuf prev = STRBUF_INIT;
957 /* Skip up to the first boundary */
958 if (*(mi->content_top)) {
959 if (!find_boundary(mi, line))
960 goto handle_body_out;
963 do {
964 /* process any boundary lines */
965 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
966 /* flush any leftover */
967 if (prev.len) {
968 handle_filter(mi, &prev);
969 strbuf_reset(&prev);
971 if (!handle_boundary(mi, line))
972 goto handle_body_out;
975 /* Unwrap transfer encoding */
976 decode_transfer_encoding(mi, line);
978 switch (mi->transfer_encoding) {
979 case TE_BASE64:
980 case TE_QP:
982 struct strbuf **lines, **it, *sb;
984 /* Prepend any previous partial lines */
985 strbuf_insert(line, 0, prev.buf, prev.len);
986 strbuf_reset(&prev);
989 * This is a decoded line that may contain
990 * multiple new lines. Pass only one chunk
991 * at a time to handle_filter()
993 lines = strbuf_split(line, '\n');
994 for (it = lines; (sb = *it); it++) {
995 if (*(it + 1) == NULL) /* The last line */
996 if (sb->buf[sb->len - 1] != '\n') {
997 /* Partial line, save it for later. */
998 strbuf_addbuf(&prev, sb);
999 break;
1001 handle_filter(mi, sb);
1004 * The partial chunk is saved in "prev" and will be
1005 * appended by the next iteration of read_line_with_nul().
1007 strbuf_list_free(lines);
1008 break;
1010 default:
1011 handle_filter(mi, line);
1014 if (mi->input_error)
1015 break;
1016 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1018 flush_inbody_header_accum(mi);
1020 handle_body_out:
1021 strbuf_release(&prev);
1024 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1026 const char *sp = data->buf;
1027 while (1) {
1028 char *ep = strchr(sp, '\n');
1029 int len;
1030 if (!ep)
1031 len = strlen(sp);
1032 else
1033 len = ep - sp;
1034 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1035 if (!ep)
1036 break;
1037 sp = ep + 1;
1041 static void handle_info(struct mailinfo *mi)
1043 struct strbuf *hdr;
1044 int i;
1046 for (i = 0; header[i]; i++) {
1047 /* only print inbody headers if we output a patch file */
1048 if (mi->patch_lines && mi->s_hdr_data[i])
1049 hdr = mi->s_hdr_data[i];
1050 else if (mi->p_hdr_data[i])
1051 hdr = mi->p_hdr_data[i];
1052 else
1053 continue;
1055 if (!strcmp(header[i], "Subject")) {
1056 if (!mi->keep_subject) {
1057 cleanup_subject(mi, hdr);
1058 cleanup_space(hdr);
1060 output_header_lines(mi->output, "Subject", hdr);
1061 } else if (!strcmp(header[i], "From")) {
1062 cleanup_space(hdr);
1063 handle_from(mi, hdr);
1064 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1065 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1066 } else {
1067 cleanup_space(hdr);
1068 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1071 fprintf(mi->output, "\n");
1074 int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1076 FILE *cmitmsg;
1077 int peek;
1078 struct strbuf line = STRBUF_INIT;
1080 cmitmsg = fopen(msg, "w");
1081 if (!cmitmsg) {
1082 perror(msg);
1083 return -1;
1085 mi->patchfile = fopen(patch, "w");
1086 if (!mi->patchfile) {
1087 perror(patch);
1088 fclose(cmitmsg);
1089 return -1;
1092 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1093 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1095 do {
1096 peek = fgetc(mi->input);
1097 } while (isspace(peek));
1098 ungetc(peek, mi->input);
1100 /* process the email header */
1101 while (read_one_header_line(&line, mi->input))
1102 check_header(mi, &line, mi->p_hdr_data, 1);
1104 handle_body(mi, &line);
1105 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1106 fclose(cmitmsg);
1107 fclose(mi->patchfile);
1109 handle_info(mi);
1110 strbuf_release(&line);
1111 return mi->input_error;
1114 static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1116 struct mailinfo *mi = mi_;
1118 if (!starts_with(var, "mailinfo."))
1119 return git_default_config(var, value, NULL);
1120 if (!strcmp(var, "mailinfo.scissors")) {
1121 mi->use_scissors = git_config_bool(var, value);
1122 return 0;
1124 /* perhaps others here */
1125 return 0;
1128 void setup_mailinfo(struct mailinfo *mi)
1130 memset(mi, 0, sizeof(*mi));
1131 strbuf_init(&mi->name, 0);
1132 strbuf_init(&mi->email, 0);
1133 strbuf_init(&mi->charset, 0);
1134 strbuf_init(&mi->log_message, 0);
1135 strbuf_init(&mi->inbody_header_accum, 0);
1136 mi->header_stage = 1;
1137 mi->use_inbody_headers = 1;
1138 mi->content_top = mi->content;
1139 git_config(git_mailinfo_config, mi);
1142 void clear_mailinfo(struct mailinfo *mi)
1144 int i;
1146 strbuf_release(&mi->name);
1147 strbuf_release(&mi->email);
1148 strbuf_release(&mi->charset);
1149 strbuf_release(&mi->inbody_header_accum);
1150 free(mi->message_id);
1152 for (i = 0; mi->p_hdr_data[i]; i++)
1153 strbuf_release(mi->p_hdr_data[i]);
1154 free(mi->p_hdr_data);
1155 for (i = 0; mi->s_hdr_data[i]; i++)
1156 strbuf_release(mi->s_hdr_data[i]);
1157 free(mi->s_hdr_data);
1159 while (mi->content < mi->content_top) {
1160 free(*(mi->content_top));
1161 mi->content_top--;
1164 strbuf_release(&mi->log_message);