Merge branch 'rb/hpe'
[git.git] / mailinfo.c
blobb395adbdf2a405567bc40c254125265f30b12bbd
1 #include "cache.h"
2 #include "config.h"
3 #include "utf8.h"
4 #include "strbuf.h"
5 #include "mailinfo.h"
7 static void cleanup_space(struct strbuf *sb)
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);
19 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
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);
31 static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
33 /* John Doe <johndoe> */
35 char *bra, *ket;
36 /* This is fallback, so do not bother if we already have an
37 * e-mail address.
39 if (mi->email.len)
40 return;
42 bra = strchr(line->buf, '<');
43 if (!bra)
44 return;
45 ket = strchr(bra, '>');
46 if (!ket)
47 return;
49 strbuf_reset(&mi->email);
50 strbuf_add(&mi->email, bra + 1, ket - bra - 1);
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);
58 static const char *unquote_comment(struct strbuf *outbuf, const char *in)
60 int c;
61 int take_next_literally = 0;
63 strbuf_addch(outbuf, '(');
65 while ((c = *in++) != 0) {
66 if (take_next_literally == 1) {
67 take_next_literally = 0;
68 } else {
69 switch (c) {
70 case '\\':
71 take_next_literally = 1;
72 continue;
73 case '(':
74 in = unquote_comment(outbuf, in);
75 continue;
76 case ')':
77 strbuf_addch(outbuf, ')');
78 return in;
82 strbuf_addch(outbuf, c);
85 return in;
88 static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
90 int c;
91 int take_next_literally = 0;
93 while ((c = *in++) != 0) {
94 if (take_next_literally == 1) {
95 take_next_literally = 0;
96 } else {
97 switch (c) {
98 case '\\':
99 take_next_literally = 1;
100 continue;
101 case '"':
102 return in;
106 strbuf_addch(outbuf, c);
109 return in;
112 static void unquote_quoted_pair(struct strbuf *line)
114 struct strbuf outbuf;
115 const char *in = line->buf;
116 int c;
118 strbuf_init(&outbuf, line->len);
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;
130 strbuf_addch(&outbuf, c);
133 strbuf_swap(&outbuf, line);
134 strbuf_release(&outbuf);
138 static void handle_from(struct mailinfo *mi, const struct strbuf *from)
140 char *at;
141 size_t el;
142 struct strbuf f;
144 strbuf_init(&f, from->len);
145 strbuf_addbuf(&f, from);
147 unquote_quoted_pair(&f);
149 at = strchr(f.buf, '@');
150 if (!at) {
151 parse_bogus_from(mi, from);
152 goto out;
156 * If we already have one email, don't take any confusing lines
158 if (mi->email.len && strchr(at + 1, '@'))
159 goto out;
161 /* Pick up the string around '@', possibly delimited with <>
162 * pair; that is the email part.
164 while (at > f.buf) {
165 char c = at[-1];
166 if (isspace(c))
167 break;
168 if (c == '<') {
169 at[-1] = ' ';
170 break;
172 at--;
174 el = strcspn(at, " \n\t\r\v\f>");
175 strbuf_reset(&mi->email);
176 strbuf_add(&mi->email, at, el);
177 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
179 /* The remainder is name. It could be
181 * - "John Doe <john.doe@xz>" (a), or
182 * - "john.doe@xz (John Doe)" (b), or
183 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
185 * but we have removed the email part, so
187 * - remove extra spaces which could stay after email (case 'c'), and
188 * - trim from both ends, possibly removing the () pair at the end
189 * (cases 'a' and 'b').
191 cleanup_space(&f);
192 strbuf_trim(&f);
193 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
194 strbuf_remove(&f, 0, 1);
195 strbuf_setlen(&f, f.len - 1);
198 get_sane_name(&mi->name, &f, &mi->email);
199 out:
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 int has_attr_value(const char *line, const char *name, const char *value)
242 struct strbuf sb = STRBUF_INIT;
243 int rc = slurp_attr(line, name, &sb) && !strcasecmp(sb.buf, value);
244 strbuf_release(&sb);
245 return rc;
248 static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
250 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
251 strbuf_init(boundary, line->len);
253 mi->format_flowed = has_attr_value(line->buf, "format=", "flowed");
254 mi->delsp = has_attr_value(line->buf, "delsp=", "yes");
256 if (slurp_attr(line->buf, "boundary=", boundary)) {
257 strbuf_insert(boundary, 0, "--", 2);
258 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
259 error("Too many boundaries to handle");
260 mi->input_error = -1;
261 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
262 return;
264 *(mi->content_top) = boundary;
265 boundary = NULL;
267 slurp_attr(line->buf, "charset=", &mi->charset);
269 if (boundary) {
270 strbuf_release(boundary);
271 free(boundary);
275 static void handle_content_transfer_encoding(struct mailinfo *mi,
276 const struct strbuf *line)
278 if (strcasestr(line->buf, "base64"))
279 mi->transfer_encoding = TE_BASE64;
280 else if (strcasestr(line->buf, "quoted-printable"))
281 mi->transfer_encoding = TE_QP;
282 else
283 mi->transfer_encoding = TE_DONTCARE;
286 static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
288 struct strbuf *content_top = *(mi->content_top);
290 return ((content_top->len <= line->len) &&
291 !memcmp(line->buf, content_top->buf, content_top->len));
294 static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
296 size_t at = 0;
298 while (at < subject->len) {
299 char *pos;
300 size_t remove;
302 switch (subject->buf[at]) {
303 case 'r': case 'R':
304 if (subject->len <= at + 3)
305 break;
306 if ((subject->buf[at + 1] == 'e' ||
307 subject->buf[at + 1] == 'E') &&
308 subject->buf[at + 2] == ':') {
309 strbuf_remove(subject, at, 3);
310 continue;
312 at++;
313 break;
314 case ' ': case '\t': case ':':
315 strbuf_remove(subject, at, 1);
316 continue;
317 case '[':
318 pos = strchr(subject->buf + at, ']');
319 if (!pos)
320 break;
321 remove = pos - subject->buf + at + 1;
322 if (!mi->keep_non_patch_brackets_in_subject ||
323 (7 <= remove &&
324 memmem(subject->buf + at, remove, "PATCH", 5)))
325 strbuf_remove(subject, at, remove);
326 else {
327 at += remove;
329 * If the input had a space after the ], keep
330 * it. We don't bother with finding the end of
331 * the space, since we later normalize it
332 * anyway.
334 if (isspace(subject->buf[at]))
335 at += 1;
337 continue;
339 break;
341 strbuf_trim(subject);
344 #define MAX_HDR_PARSED 10
345 static const char *header[MAX_HDR_PARSED] = {
346 "From","Subject","Date",
349 static inline int cmp_header(const struct strbuf *line, const char *hdr)
351 int len = strlen(hdr);
352 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
353 line->buf[len] == ':' && isspace(line->buf[len + 1]);
356 static int is_format_patch_separator(const char *line, int len)
358 static const char SAMPLE[] =
359 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
360 const char *cp;
362 if (len != strlen(SAMPLE))
363 return 0;
364 if (!skip_prefix(line, "From ", &cp))
365 return 0;
366 if (strspn(cp, "0123456789abcdef") != 40)
367 return 0;
368 cp += 40;
369 return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
372 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
374 const char *in = q_seg->buf;
375 int c;
376 struct strbuf *out = xmalloc(sizeof(struct strbuf));
377 strbuf_init(out, q_seg->len);
379 while ((c = *in++) != 0) {
380 if (c == '=') {
381 int ch, d = *in;
382 if (d == '\n' || !d)
383 break; /* drop trailing newline */
384 ch = hex2chr(in);
385 if (ch >= 0) {
386 strbuf_addch(out, ch);
387 in += 2;
388 continue;
390 /* garbage -- fall through */
392 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
393 c = 0x20;
394 strbuf_addch(out, c);
396 return out;
399 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
401 /* Decode in..ep, possibly in-place to ot */
402 int c, pos = 0, acc = 0;
403 const char *in = b_seg->buf;
404 struct strbuf *out = xmalloc(sizeof(struct strbuf));
405 strbuf_init(out, b_seg->len);
407 while ((c = *in++) != 0) {
408 if (c == '+')
409 c = 62;
410 else if (c == '/')
411 c = 63;
412 else if ('A' <= c && c <= 'Z')
413 c -= 'A';
414 else if ('a' <= c && c <= 'z')
415 c -= 'a' - 26;
416 else if ('0' <= c && c <= '9')
417 c -= '0' - 52;
418 else
419 continue; /* garbage */
420 switch (pos++) {
421 case 0:
422 acc = (c << 2);
423 break;
424 case 1:
425 strbuf_addch(out, (acc | (c >> 4)));
426 acc = (c & 15) << 4;
427 break;
428 case 2:
429 strbuf_addch(out, (acc | (c >> 2)));
430 acc = (c & 3) << 6;
431 break;
432 case 3:
433 strbuf_addch(out, (acc | c));
434 acc = pos = 0;
435 break;
438 return out;
441 static int convert_to_utf8(struct mailinfo *mi,
442 struct strbuf *line, const char *charset)
444 char *out;
446 if (!mi->metainfo_charset || !charset || !*charset)
447 return 0;
449 if (same_encoding(mi->metainfo_charset, charset))
450 return 0;
451 out = reencode_string(line->buf, mi->metainfo_charset, charset);
452 if (!out) {
453 mi->input_error = -1;
454 return error("cannot convert from %s to %s",
455 charset, mi->metainfo_charset);
457 strbuf_attach(line, out, strlen(out), strlen(out));
458 return 0;
461 static void decode_header(struct mailinfo *mi, struct strbuf *it)
463 char *in, *ep, *cp;
464 struct strbuf outbuf = STRBUF_INIT, *dec;
465 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
466 int found_error = 1; /* pessimism */
468 in = it->buf;
469 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
470 int encoding;
471 strbuf_reset(&charset_q);
472 strbuf_reset(&piecebuf);
474 if (in != ep) {
476 * We are about to process an encoded-word
477 * that begins at ep, but there is something
478 * before the encoded word.
480 char *scan;
481 for (scan = in; scan < ep; scan++)
482 if (!isspace(*scan))
483 break;
485 if (scan != ep || in == it->buf) {
487 * We should not lose that "something",
488 * unless we have just processed an
489 * encoded-word, and there is only LWS
490 * before the one we are about to process.
492 strbuf_add(&outbuf, in, ep - in);
495 /* E.g.
496 * ep : "=?iso-2022-jp?B?GyR...?= foo"
497 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
499 ep += 2;
501 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
502 goto release_return;
504 if (cp + 3 - it->buf > it->len)
505 goto release_return;
506 strbuf_add(&charset_q, ep, cp - ep);
508 encoding = cp[1];
509 if (!encoding || cp[2] != '?')
510 goto release_return;
511 ep = strstr(cp + 3, "?=");
512 if (!ep)
513 goto release_return;
514 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
515 switch (tolower(encoding)) {
516 default:
517 goto release_return;
518 case 'b':
519 dec = decode_b_segment(&piecebuf);
520 break;
521 case 'q':
522 dec = decode_q_segment(&piecebuf, 1);
523 break;
525 if (convert_to_utf8(mi, dec, charset_q.buf))
526 goto release_return;
528 strbuf_addbuf(&outbuf, dec);
529 strbuf_release(dec);
530 free(dec);
531 in = ep + 2;
533 strbuf_addstr(&outbuf, in);
534 strbuf_reset(it);
535 strbuf_addbuf(it, &outbuf);
536 found_error = 0;
537 release_return:
538 strbuf_release(&outbuf);
539 strbuf_release(&charset_q);
540 strbuf_release(&piecebuf);
542 if (found_error)
543 mi->input_error = -1;
546 static int check_header(struct mailinfo *mi,
547 const struct strbuf *line,
548 struct strbuf *hdr_data[], int overwrite)
550 int i, ret = 0, len;
551 struct strbuf sb = STRBUF_INIT;
553 /* search for the interesting parts */
554 for (i = 0; header[i]; i++) {
555 int len = strlen(header[i]);
556 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
557 /* Unwrap inline B and Q encoding, and optionally
558 * normalize the meta information to utf8.
560 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
561 decode_header(mi, &sb);
562 handle_header(&hdr_data[i], &sb);
563 ret = 1;
564 goto check_header_out;
568 /* Content stuff */
569 if (cmp_header(line, "Content-Type")) {
570 len = strlen("Content-Type: ");
571 strbuf_add(&sb, line->buf + len, line->len - len);
572 decode_header(mi, &sb);
573 strbuf_insert(&sb, 0, "Content-Type: ", len);
574 handle_content_type(mi, &sb);
575 ret = 1;
576 goto check_header_out;
578 if (cmp_header(line, "Content-Transfer-Encoding")) {
579 len = strlen("Content-Transfer-Encoding: ");
580 strbuf_add(&sb, line->buf + len, line->len - len);
581 decode_header(mi, &sb);
582 handle_content_transfer_encoding(mi, &sb);
583 ret = 1;
584 goto check_header_out;
586 if (cmp_header(line, "Message-Id")) {
587 len = strlen("Message-Id: ");
588 strbuf_add(&sb, line->buf + len, line->len - len);
589 decode_header(mi, &sb);
590 if (mi->add_message_id)
591 mi->message_id = strbuf_detach(&sb, NULL);
592 ret = 1;
593 goto check_header_out;
596 check_header_out:
597 strbuf_release(&sb);
598 return ret;
602 * Returns 1 if the given line or any line beginning with the given line is an
603 * in-body header (that is, check_header will succeed when passed
604 * mi->s_hdr_data).
606 static int is_inbody_header(const struct mailinfo *mi,
607 const struct strbuf *line)
609 int i;
610 for (i = 0; header[i]; i++)
611 if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
612 return 1;
613 return 0;
616 static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
618 struct strbuf *ret;
620 switch (mi->transfer_encoding) {
621 case TE_QP:
622 ret = decode_q_segment(line, 0);
623 break;
624 case TE_BASE64:
625 ret = decode_b_segment(line);
626 break;
627 case TE_DONTCARE:
628 default:
629 return;
631 strbuf_reset(line);
632 strbuf_addbuf(line, ret);
633 strbuf_release(ret);
634 free(ret);
637 static inline int patchbreak(const struct strbuf *line)
639 size_t i;
641 /* Beginning of a "diff -" header? */
642 if (starts_with(line->buf, "diff -"))
643 return 1;
645 /* CVS "Index: " line? */
646 if (starts_with(line->buf, "Index: "))
647 return 1;
650 * "--- <filename>" starts patches without headers
651 * "---<sp>*" is a manual separator
653 if (line->len < 4)
654 return 0;
656 if (starts_with(line->buf, "---")) {
657 /* space followed by a filename? */
658 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
659 return 1;
660 /* Just whitespace? */
661 for (i = 3; i < line->len; i++) {
662 unsigned char c = line->buf[i];
663 if (c == '\n')
664 return 1;
665 if (!isspace(c))
666 break;
668 return 0;
670 return 0;
673 static int is_scissors_line(const char *line)
675 const char *c;
676 int scissors = 0, gap = 0;
677 const char *first_nonblank = NULL, *last_nonblank = NULL;
678 int visible, perforation = 0, in_perforation = 0;
680 for (c = line; *c; c++) {
681 if (isspace(*c)) {
682 if (in_perforation) {
683 perforation++;
684 gap++;
686 continue;
688 last_nonblank = c;
689 if (first_nonblank == NULL)
690 first_nonblank = c;
691 if (*c == '-') {
692 in_perforation = 1;
693 perforation++;
694 continue;
696 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
697 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
698 in_perforation = 1;
699 perforation += 2;
700 scissors += 2;
701 c++;
702 continue;
704 in_perforation = 0;
708 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
709 * Even though there can be arbitrary cruft on the same line
710 * (e.g. "cut here"), in order to avoid misidentification, the
711 * perforation must occupy more than a third of the visible
712 * width of the line, and dashes and scissors must occupy more
713 * than half of the perforation.
716 if (first_nonblank && last_nonblank)
717 visible = last_nonblank - first_nonblank + 1;
718 else
719 visible = 0;
720 return (scissors && 8 <= visible &&
721 visible < perforation * 3 &&
722 gap * 2 < perforation);
725 static void flush_inbody_header_accum(struct mailinfo *mi)
727 if (!mi->inbody_header_accum.len)
728 return;
729 if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
730 BUG("inbody_header_accum, if not empty, must always contain a valid in-body header");
731 strbuf_reset(&mi->inbody_header_accum);
734 static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
736 if (mi->inbody_header_accum.len &&
737 (line->buf[0] == ' ' || line->buf[0] == '\t')) {
738 if (mi->use_scissors && is_scissors_line(line->buf)) {
740 * This is a scissors line; do not consider this line
741 * as a header continuation line.
743 flush_inbody_header_accum(mi);
744 return 0;
746 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
747 strbuf_addbuf(&mi->inbody_header_accum, line);
748 return 1;
751 flush_inbody_header_accum(mi);
753 if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
754 return is_format_patch_separator(line->buf + 1, line->len - 1);
755 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
756 int i;
757 for (i = 0; header[i]; i++)
758 if (!strcmp("Subject", header[i])) {
759 handle_header(&mi->s_hdr_data[i], line);
760 return 1;
762 return 0;
764 if (is_inbody_header(mi, line)) {
765 strbuf_addbuf(&mi->inbody_header_accum, line);
766 return 1;
768 return 0;
771 static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
773 assert(!mi->filter_stage);
775 if (mi->header_stage) {
776 if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
777 if (mi->inbody_header_accum.len) {
778 flush_inbody_header_accum(mi);
779 mi->header_stage = 0;
781 return 0;
785 if (mi->use_inbody_headers && mi->header_stage) {
786 mi->header_stage = check_inbody_header(mi, line);
787 if (mi->header_stage)
788 return 0;
789 } else
790 /* Only trim the first (blank) line of the commit message
791 * when ignoring in-body headers.
793 mi->header_stage = 0;
795 /* normalize the log message to UTF-8. */
796 if (convert_to_utf8(mi, line, mi->charset.buf))
797 return 0; /* mi->input_error already set */
799 if (mi->use_scissors && is_scissors_line(line->buf)) {
800 int i;
802 strbuf_setlen(&mi->log_message, 0);
803 mi->header_stage = 1;
806 * We may have already read "secondary headers"; purge
807 * them to give ourselves a clean restart.
809 for (i = 0; header[i]; i++) {
810 if (mi->s_hdr_data[i])
811 strbuf_release(mi->s_hdr_data[i]);
812 mi->s_hdr_data[i] = NULL;
814 return 0;
817 if (patchbreak(line)) {
818 if (mi->message_id)
819 strbuf_addf(&mi->log_message,
820 "Message-Id: %s\n", mi->message_id);
821 return 1;
824 strbuf_addbuf(&mi->log_message, line);
825 return 0;
828 static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
830 fwrite(line->buf, 1, line->len, mi->patchfile);
831 mi->patch_lines++;
834 static void handle_filter(struct mailinfo *mi, struct strbuf *line)
836 switch (mi->filter_stage) {
837 case 0:
838 if (!handle_commit_msg(mi, line))
839 break;
840 mi->filter_stage++;
841 /* fallthrough */
842 case 1:
843 handle_patch(mi, line);
844 break;
848 static int is_rfc2822_header(const struct strbuf *line)
851 * The section that defines the loosest possible
852 * field name is "3.6.8 Optional fields".
854 * optional-field = field-name ":" unstructured CRLF
855 * field-name = 1*ftext
856 * ftext = %d33-57 / %59-126
858 int ch;
859 char *cp = line->buf;
861 /* Count mbox From headers as headers */
862 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
863 return 1;
865 while ((ch = *cp++)) {
866 if (ch == ':')
867 return 1;
868 if ((33 <= ch && ch <= 57) ||
869 (59 <= ch && ch <= 126))
870 continue;
871 break;
873 return 0;
876 static int read_one_header_line(struct strbuf *line, FILE *in)
878 struct strbuf continuation = STRBUF_INIT;
880 /* Get the first part of the line. */
881 if (strbuf_getline_lf(line, in))
882 return 0;
885 * Is it an empty line or not a valid rfc2822 header?
886 * If so, stop here, and return false ("not a header")
888 strbuf_rtrim(line);
889 if (!line->len || !is_rfc2822_header(line)) {
890 /* Re-add the newline */
891 strbuf_addch(line, '\n');
892 return 0;
896 * Now we need to eat all the continuation lines..
897 * Yuck, 2822 header "folding"
899 for (;;) {
900 int peek;
902 peek = fgetc(in);
903 if (peek == EOF)
904 break;
905 ungetc(peek, in);
906 if (peek != ' ' && peek != '\t')
907 break;
908 if (strbuf_getline_lf(&continuation, in))
909 break;
910 continuation.buf[0] = ' ';
911 strbuf_rtrim(&continuation);
912 strbuf_addbuf(line, &continuation);
914 strbuf_release(&continuation);
916 return 1;
919 static int find_boundary(struct mailinfo *mi, struct strbuf *line)
921 while (!strbuf_getline_lf(line, mi->input)) {
922 if (*(mi->content_top) && is_multipart_boundary(mi, line))
923 return 1;
925 return 0;
928 static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
930 struct strbuf newline = STRBUF_INIT;
932 strbuf_addch(&newline, '\n');
933 again:
934 if (line->len >= (*(mi->content_top))->len + 2 &&
935 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
936 /* we hit an end boundary */
937 /* pop the current boundary off the stack */
938 strbuf_release(*(mi->content_top));
939 FREE_AND_NULL(*(mi->content_top));
941 /* technically won't happen as is_multipart_boundary()
942 will fail first. But just in case..
944 if (--mi->content_top < mi->content) {
945 error("Detected mismatched boundaries, can't recover");
946 mi->input_error = -1;
947 mi->content_top = mi->content;
948 strbuf_release(&newline);
949 return 0;
951 handle_filter(mi, &newline);
952 strbuf_release(&newline);
953 if (mi->input_error)
954 return 0;
956 /* skip to the next boundary */
957 if (!find_boundary(mi, line))
958 return 0;
959 goto again;
962 /* set some defaults */
963 mi->transfer_encoding = TE_DONTCARE;
964 strbuf_reset(&mi->charset);
966 /* slurp in this section's info */
967 while (read_one_header_line(line, mi->input))
968 check_header(mi, line, mi->p_hdr_data, 0);
970 strbuf_release(&newline);
971 /* replenish line */
972 if (strbuf_getline_lf(line, mi->input))
973 return 0;
974 strbuf_addch(line, '\n');
975 return 1;
978 static void handle_filter_flowed(struct mailinfo *mi, struct strbuf *line,
979 struct strbuf *prev)
981 size_t len = line->len;
982 const char *rest;
984 if (!mi->format_flowed) {
985 handle_filter(mi, line);
986 return;
989 if (line->buf[len - 1] == '\n') {
990 len--;
991 if (len && line->buf[len - 1] == '\r')
992 len--;
995 /* Keep signature separator as-is. */
996 if (skip_prefix(line->buf, "-- ", &rest) && rest - line->buf == len) {
997 if (prev->len) {
998 handle_filter(mi, prev);
999 strbuf_reset(prev);
1001 handle_filter(mi, line);
1002 return;
1005 /* Unstuff space-stuffed line. */
1006 if (len && line->buf[0] == ' ') {
1007 strbuf_remove(line, 0, 1);
1008 len--;
1011 /* Save flowed line for later, but without the soft line break. */
1012 if (len && line->buf[len - 1] == ' ') {
1013 strbuf_add(prev, line->buf, len - !!mi->delsp);
1014 return;
1017 /* Prepend any previous partial lines */
1018 strbuf_insert(line, 0, prev->buf, prev->len);
1019 strbuf_reset(prev);
1021 handle_filter(mi, line);
1024 static void handle_body(struct mailinfo *mi, struct strbuf *line)
1026 struct strbuf prev = STRBUF_INIT;
1028 /* Skip up to the first boundary */
1029 if (*(mi->content_top)) {
1030 if (!find_boundary(mi, line))
1031 goto handle_body_out;
1034 do {
1035 /* process any boundary lines */
1036 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
1037 /* flush any leftover */
1038 if (prev.len) {
1039 handle_filter(mi, &prev);
1040 strbuf_reset(&prev);
1042 if (!handle_boundary(mi, line))
1043 goto handle_body_out;
1046 /* Unwrap transfer encoding */
1047 decode_transfer_encoding(mi, line);
1049 switch (mi->transfer_encoding) {
1050 case TE_BASE64:
1051 case TE_QP:
1053 struct strbuf **lines, **it, *sb;
1055 /* Prepend any previous partial lines */
1056 strbuf_insert(line, 0, prev.buf, prev.len);
1057 strbuf_reset(&prev);
1060 * This is a decoded line that may contain
1061 * multiple new lines. Pass only one chunk
1062 * at a time to handle_filter()
1064 lines = strbuf_split(line, '\n');
1065 for (it = lines; (sb = *it); it++) {
1066 if (*(it + 1) == NULL) /* The last line */
1067 if (sb->buf[sb->len - 1] != '\n') {
1068 /* Partial line, save it for later. */
1069 strbuf_addbuf(&prev, sb);
1070 break;
1072 handle_filter_flowed(mi, sb, &prev);
1075 * The partial chunk is saved in "prev" and will be
1076 * appended by the next iteration of read_line_with_nul().
1078 strbuf_list_free(lines);
1079 break;
1081 default:
1082 handle_filter_flowed(mi, line, &prev);
1085 if (mi->input_error)
1086 break;
1087 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1089 if (prev.len)
1090 handle_filter(mi, &prev);
1092 flush_inbody_header_accum(mi);
1094 handle_body_out:
1095 strbuf_release(&prev);
1098 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1100 const char *sp = data->buf;
1101 while (1) {
1102 char *ep = strchr(sp, '\n');
1103 int len;
1104 if (!ep)
1105 len = strlen(sp);
1106 else
1107 len = ep - sp;
1108 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1109 if (!ep)
1110 break;
1111 sp = ep + 1;
1115 static void handle_info(struct mailinfo *mi)
1117 struct strbuf *hdr;
1118 int i;
1120 for (i = 0; header[i]; i++) {
1121 /* only print inbody headers if we output a patch file */
1122 if (mi->patch_lines && mi->s_hdr_data[i])
1123 hdr = mi->s_hdr_data[i];
1124 else if (mi->p_hdr_data[i])
1125 hdr = mi->p_hdr_data[i];
1126 else
1127 continue;
1129 if (!strcmp(header[i], "Subject")) {
1130 if (!mi->keep_subject) {
1131 cleanup_subject(mi, hdr);
1132 cleanup_space(hdr);
1134 output_header_lines(mi->output, "Subject", hdr);
1135 } else if (!strcmp(header[i], "From")) {
1136 cleanup_space(hdr);
1137 handle_from(mi, hdr);
1138 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1139 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1140 } else {
1141 cleanup_space(hdr);
1142 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1145 fprintf(mi->output, "\n");
1148 int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1150 FILE *cmitmsg;
1151 int peek;
1152 struct strbuf line = STRBUF_INIT;
1154 cmitmsg = fopen(msg, "w");
1155 if (!cmitmsg) {
1156 perror(msg);
1157 return -1;
1159 mi->patchfile = fopen(patch, "w");
1160 if (!mi->patchfile) {
1161 perror(patch);
1162 fclose(cmitmsg);
1163 return -1;
1166 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1167 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1169 do {
1170 peek = fgetc(mi->input);
1171 if (peek == EOF) {
1172 fclose(cmitmsg);
1173 return error("empty patch: '%s'", patch);
1175 } while (isspace(peek));
1176 ungetc(peek, mi->input);
1178 /* process the email header */
1179 while (read_one_header_line(&line, mi->input))
1180 check_header(mi, &line, mi->p_hdr_data, 1);
1182 handle_body(mi, &line);
1183 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1184 fclose(cmitmsg);
1185 fclose(mi->patchfile);
1187 handle_info(mi);
1188 strbuf_release(&line);
1189 return mi->input_error;
1192 static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1194 struct mailinfo *mi = mi_;
1196 if (!starts_with(var, "mailinfo."))
1197 return git_default_config(var, value, NULL);
1198 if (!strcmp(var, "mailinfo.scissors")) {
1199 mi->use_scissors = git_config_bool(var, value);
1200 return 0;
1202 /* perhaps others here */
1203 return 0;
1206 void setup_mailinfo(struct mailinfo *mi)
1208 memset(mi, 0, sizeof(*mi));
1209 strbuf_init(&mi->name, 0);
1210 strbuf_init(&mi->email, 0);
1211 strbuf_init(&mi->charset, 0);
1212 strbuf_init(&mi->log_message, 0);
1213 strbuf_init(&mi->inbody_header_accum, 0);
1214 mi->header_stage = 1;
1215 mi->use_inbody_headers = 1;
1216 mi->content_top = mi->content;
1217 git_config(git_mailinfo_config, mi);
1220 void clear_mailinfo(struct mailinfo *mi)
1222 int i;
1224 strbuf_release(&mi->name);
1225 strbuf_release(&mi->email);
1226 strbuf_release(&mi->charset);
1227 strbuf_release(&mi->inbody_header_accum);
1228 free(mi->message_id);
1230 if (mi->p_hdr_data)
1231 for (i = 0; mi->p_hdr_data[i]; i++)
1232 strbuf_release(mi->p_hdr_data[i]);
1233 free(mi->p_hdr_data);
1234 if (mi->s_hdr_data)
1235 for (i = 0; mi->s_hdr_data[i]; i++)
1236 strbuf_release(mi->s_hdr_data[i]);
1237 free(mi->s_hdr_data);
1239 while (mi->content < mi->content_top) {
1240 free(*(mi->content_top));
1241 mi->content_top--;
1244 strbuf_release(&mi->log_message);