fast-import: tighten parsing of boolean command line options
[git.git] / mailinfo.c
blob70187e3eb30b102c7038a1d1c4e0033d856c99ac
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 return;
156 * If we already have one email, don't take any confusing lines
158 if (mi->email.len && strchr(at + 1, '@')) {
159 strbuf_release(&f);
160 return;
163 /* Pick up the string around '@', possibly delimited with <>
164 * pair; that is the email part.
166 while (at > f.buf) {
167 char c = at[-1];
168 if (isspace(c))
169 break;
170 if (c == '<') {
171 at[-1] = ' ';
172 break;
174 at--;
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));
181 /* The remainder is name. It could be
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)
187 * but we have removed the email part, so
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').
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);
200 get_sane_name(&mi->name, &f, &mi->email);
201 strbuf_release(&f);
204 static void handle_header(struct strbuf **out, const struct strbuf *line)
206 if (!*out) {
207 *out = xmalloc(sizeof(struct strbuf));
208 strbuf_init(*out, line->len);
209 } else
210 strbuf_reset(*out);
212 strbuf_addbuf(*out, line);
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.
221 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
223 const char *ends, *ap = strcasestr(line, name);
224 size_t sz;
226 strbuf_setlen(attr, 0);
227 if (!ap)
228 return 0;
229 ap += strlen(name);
230 if (*ap == '"') {
231 ap++;
232 ends = "\"";
234 else
235 ends = "; \t";
236 sz = strcspn(ap, ends);
237 strbuf_add(attr, ap, sz);
238 return 1;
241 static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
243 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
244 strbuf_init(boundary, line->len);
246 if (slurp_attr(line->buf, "boundary=", boundary)) {
247 strbuf_insert(boundary, 0, "--", 2);
248 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
249 error("Too many boundaries to handle");
250 mi->input_error = -1;
251 mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
252 return;
254 *(mi->content_top) = boundary;
255 boundary = NULL;
257 slurp_attr(line->buf, "charset=", &mi->charset);
259 if (boundary) {
260 strbuf_release(boundary);
261 free(boundary);
265 static void handle_content_transfer_encoding(struct mailinfo *mi,
266 const struct strbuf *line)
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;
276 static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
278 struct strbuf *content_top = *(mi->content_top);
280 return ((content_top->len <= line->len) &&
281 !memcmp(line->buf, content_top->buf, content_top->len));
284 static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
286 size_t at = 0;
288 while (at < subject->len) {
289 char *pos;
290 size_t remove;
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;
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;
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.
324 if (isspace(subject->buf[at]))
325 at += 1;
327 continue;
329 break;
331 strbuf_trim(subject);
334 #define MAX_HDR_PARSED 10
335 static const char *header[MAX_HDR_PARSED] = {
336 "From","Subject","Date",
339 static inline int cmp_header(const struct strbuf *line, const char *hdr)
341 int len = strlen(hdr);
342 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
343 line->buf[len] == ':' && isspace(line->buf[len + 1]);
346 static int is_format_patch_separator(const char *line, int len)
348 static const char SAMPLE[] =
349 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
350 const char *cp;
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));
362 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
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);
369 while ((c = *in++) != 0) {
370 if (c == '=') {
371 int ch, d = *in;
372 if (d == '\n' || !d)
373 break; /* drop trailing newline */
374 ch = hex2chr(in);
375 if (ch >= 0) {
376 strbuf_addch(out, ch);
377 in += 2;
378 continue;
380 /* garbage -- fall through */
382 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
383 c = 0x20;
384 strbuf_addch(out, c);
386 return out;
389 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
391 /* Decode in..ep, possibly in-place to ot */
392 int c, pos = 0, acc = 0;
393 const char *in = b_seg->buf;
394 struct strbuf *out = xmalloc(sizeof(struct strbuf));
395 strbuf_init(out, b_seg->len);
397 while ((c = *in++) != 0) {
398 if (c == '+')
399 c = 62;
400 else if (c == '/')
401 c = 63;
402 else if ('A' <= c && c <= 'Z')
403 c -= 'A';
404 else if ('a' <= c && c <= 'z')
405 c -= 'a' - 26;
406 else if ('0' <= c && c <= '9')
407 c -= '0' - 52;
408 else
409 continue; /* garbage */
410 switch (pos++) {
411 case 0:
412 acc = (c << 2);
413 break;
414 case 1:
415 strbuf_addch(out, (acc | (c >> 4)));
416 acc = (c & 15) << 4;
417 break;
418 case 2:
419 strbuf_addch(out, (acc | (c >> 2)));
420 acc = (c & 3) << 6;
421 break;
422 case 3:
423 strbuf_addch(out, (acc | c));
424 acc = pos = 0;
425 break;
428 return out;
431 static int convert_to_utf8(struct mailinfo *mi,
432 struct strbuf *line, const char *charset)
434 char *out;
436 if (!mi->metainfo_charset || !charset || !*charset)
437 return 0;
439 if (same_encoding(mi->metainfo_charset, charset))
440 return 0;
441 out = reencode_string(line->buf, mi->metainfo_charset, charset);
442 if (!out) {
443 mi->input_error = -1;
444 return error("cannot convert from %s to %s",
445 charset, mi->metainfo_charset);
447 strbuf_attach(line, out, strlen(out), strlen(out));
448 return 0;
451 static void decode_header(struct mailinfo *mi, struct strbuf *it)
453 char *in, *ep, *cp;
454 struct strbuf outbuf = STRBUF_INIT, *dec;
455 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
456 int found_error = 1; /* pessimism */
458 in = it->buf;
459 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
460 int encoding;
461 strbuf_reset(&charset_q);
462 strbuf_reset(&piecebuf);
464 if (in != ep) {
466 * We are about to process an encoded-word
467 * that begins at ep, but there is something
468 * before the encoded word.
470 char *scan;
471 for (scan = in; scan < ep; scan++)
472 if (!isspace(*scan))
473 break;
475 if (scan != ep || in == it->buf) {
477 * We should not lose that "something",
478 * unless we have just processed an
479 * encoded-word, and there is only LWS
480 * before the one we are about to process.
482 strbuf_add(&outbuf, in, ep - in);
485 /* E.g.
486 * ep : "=?iso-2022-jp?B?GyR...?= foo"
487 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
489 ep += 2;
491 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
492 goto release_return;
494 if (cp + 3 - it->buf > it->len)
495 goto release_return;
496 strbuf_add(&charset_q, ep, cp - ep);
498 encoding = cp[1];
499 if (!encoding || cp[2] != '?')
500 goto release_return;
501 ep = strstr(cp + 3, "?=");
502 if (!ep)
503 goto release_return;
504 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
505 switch (tolower(encoding)) {
506 default:
507 goto release_return;
508 case 'b':
509 dec = decode_b_segment(&piecebuf);
510 break;
511 case 'q':
512 dec = decode_q_segment(&piecebuf, 1);
513 break;
515 if (convert_to_utf8(mi, dec, charset_q.buf))
516 goto release_return;
518 strbuf_addbuf(&outbuf, dec);
519 strbuf_release(dec);
520 free(dec);
521 in = ep + 2;
523 strbuf_addstr(&outbuf, in);
524 strbuf_reset(it);
525 strbuf_addbuf(it, &outbuf);
526 found_error = 0;
527 release_return:
528 strbuf_release(&outbuf);
529 strbuf_release(&charset_q);
530 strbuf_release(&piecebuf);
532 if (found_error)
533 mi->input_error = -1;
536 static int check_header(struct mailinfo *mi,
537 const struct strbuf *line,
538 struct strbuf *hdr_data[], int overwrite)
540 int i, ret = 0, len;
541 struct strbuf sb = STRBUF_INIT;
543 /* search for the interesting parts */
544 for (i = 0; header[i]; i++) {
545 int len = strlen(header[i]);
546 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
547 /* Unwrap inline B and Q encoding, and optionally
548 * normalize the meta information to utf8.
550 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
551 decode_header(mi, &sb);
552 handle_header(&hdr_data[i], &sb);
553 ret = 1;
554 goto check_header_out;
558 /* Content stuff */
559 if (cmp_header(line, "Content-Type")) {
560 len = strlen("Content-Type: ");
561 strbuf_add(&sb, line->buf + len, line->len - len);
562 decode_header(mi, &sb);
563 strbuf_insert(&sb, 0, "Content-Type: ", len);
564 handle_content_type(mi, &sb);
565 ret = 1;
566 goto check_header_out;
568 if (cmp_header(line, "Content-Transfer-Encoding")) {
569 len = strlen("Content-Transfer-Encoding: ");
570 strbuf_add(&sb, line->buf + len, line->len - len);
571 decode_header(mi, &sb);
572 handle_content_transfer_encoding(mi, &sb);
573 ret = 1;
574 goto check_header_out;
576 if (cmp_header(line, "Message-Id")) {
577 len = strlen("Message-Id: ");
578 strbuf_add(&sb, line->buf + len, line->len - len);
579 decode_header(mi, &sb);
580 if (mi->add_message_id)
581 mi->message_id = strbuf_detach(&sb, NULL);
582 ret = 1;
583 goto check_header_out;
586 check_header_out:
587 strbuf_release(&sb);
588 return ret;
592 * Returns 1 if the given line or any line beginning with the given line is an
593 * in-body header (that is, check_header will succeed when passed
594 * mi->s_hdr_data).
596 static int is_inbody_header(const struct mailinfo *mi,
597 const struct strbuf *line)
599 int i;
600 for (i = 0; header[i]; i++)
601 if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
602 return 1;
603 return 0;
606 static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
608 struct strbuf *ret;
610 switch (mi->transfer_encoding) {
611 case TE_QP:
612 ret = decode_q_segment(line, 0);
613 break;
614 case TE_BASE64:
615 ret = decode_b_segment(line);
616 break;
617 case TE_DONTCARE:
618 default:
619 return;
621 strbuf_reset(line);
622 strbuf_addbuf(line, ret);
623 strbuf_release(ret);
624 free(ret);
627 static inline int patchbreak(const struct strbuf *line)
629 size_t i;
631 /* Beginning of a "diff -" header? */
632 if (starts_with(line->buf, "diff -"))
633 return 1;
635 /* CVS "Index: " line? */
636 if (starts_with(line->buf, "Index: "))
637 return 1;
640 * "--- <filename>" starts patches without headers
641 * "---<sp>*" is a manual separator
643 if (line->len < 4)
644 return 0;
646 if (starts_with(line->buf, "---")) {
647 /* space followed by a filename? */
648 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
649 return 1;
650 /* Just whitespace? */
651 for (i = 3; i < line->len; i++) {
652 unsigned char c = line->buf[i];
653 if (c == '\n')
654 return 1;
655 if (!isspace(c))
656 break;
658 return 0;
660 return 0;
663 static int is_scissors_line(const char *line)
665 const char *c;
666 int scissors = 0, gap = 0;
667 const char *first_nonblank = NULL, *last_nonblank = NULL;
668 int visible, perforation = 0, in_perforation = 0;
670 for (c = line; *c; c++) {
671 if (isspace(*c)) {
672 if (in_perforation) {
673 perforation++;
674 gap++;
676 continue;
678 last_nonblank = c;
679 if (first_nonblank == NULL)
680 first_nonblank = c;
681 if (*c == '-') {
682 in_perforation = 1;
683 perforation++;
684 continue;
686 if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
687 !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
688 in_perforation = 1;
689 perforation += 2;
690 scissors += 2;
691 c++;
692 continue;
694 in_perforation = 0;
698 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
699 * Even though there can be arbitrary cruft on the same line
700 * (e.g. "cut here"), in order to avoid misidentification, the
701 * perforation must occupy more than a third of the visible
702 * width of the line, and dashes and scissors must occupy more
703 * than half of the perforation.
706 if (first_nonblank && last_nonblank)
707 visible = last_nonblank - first_nonblank + 1;
708 else
709 visible = 0;
710 return (scissors && 8 <= visible &&
711 visible < perforation * 3 &&
712 gap * 2 < perforation);
715 static void flush_inbody_header_accum(struct mailinfo *mi)
717 if (!mi->inbody_header_accum.len)
718 return;
719 if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
720 die("BUG: inbody_header_accum, if not empty, must always contain a valid in-body header");
721 strbuf_reset(&mi->inbody_header_accum);
724 static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
726 if (mi->inbody_header_accum.len &&
727 (line->buf[0] == ' ' || line->buf[0] == '\t')) {
728 if (mi->use_scissors && is_scissors_line(line->buf)) {
730 * This is a scissors line; do not consider this line
731 * as a header continuation line.
733 flush_inbody_header_accum(mi);
734 return 0;
736 strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
737 strbuf_addbuf(&mi->inbody_header_accum, line);
738 return 1;
741 flush_inbody_header_accum(mi);
743 if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
744 return is_format_patch_separator(line->buf + 1, line->len - 1);
745 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
746 int i;
747 for (i = 0; header[i]; i++)
748 if (!strcmp("Subject", header[i])) {
749 handle_header(&mi->s_hdr_data[i], line);
750 return 1;
752 return 0;
754 if (is_inbody_header(mi, line)) {
755 strbuf_addbuf(&mi->inbody_header_accum, line);
756 return 1;
758 return 0;
761 static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
763 assert(!mi->filter_stage);
765 if (mi->header_stage) {
766 if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
767 if (mi->inbody_header_accum.len) {
768 flush_inbody_header_accum(mi);
769 mi->header_stage = 0;
771 return 0;
775 if (mi->use_inbody_headers && mi->header_stage) {
776 mi->header_stage = check_inbody_header(mi, line);
777 if (mi->header_stage)
778 return 0;
779 } else
780 /* Only trim the first (blank) line of the commit message
781 * when ignoring in-body headers.
783 mi->header_stage = 0;
785 /* normalize the log message to UTF-8. */
786 if (convert_to_utf8(mi, line, mi->charset.buf))
787 return 0; /* mi->input_error already set */
789 if (mi->use_scissors && is_scissors_line(line->buf)) {
790 int i;
792 strbuf_setlen(&mi->log_message, 0);
793 mi->header_stage = 1;
796 * We may have already read "secondary headers"; purge
797 * them to give ourselves a clean restart.
799 for (i = 0; header[i]; i++) {
800 if (mi->s_hdr_data[i])
801 strbuf_release(mi->s_hdr_data[i]);
802 mi->s_hdr_data[i] = NULL;
804 return 0;
807 if (patchbreak(line)) {
808 if (mi->message_id)
809 strbuf_addf(&mi->log_message,
810 "Message-Id: %s\n", mi->message_id);
811 return 1;
814 strbuf_addbuf(&mi->log_message, line);
815 return 0;
818 static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
820 fwrite(line->buf, 1, line->len, mi->patchfile);
821 mi->patch_lines++;
824 static void handle_filter(struct mailinfo *mi, struct strbuf *line)
826 switch (mi->filter_stage) {
827 case 0:
828 if (!handle_commit_msg(mi, line))
829 break;
830 mi->filter_stage++;
831 case 1:
832 handle_patch(mi, line);
833 break;
837 static int is_rfc2822_header(const struct strbuf *line)
840 * The section that defines the loosest possible
841 * field name is "3.6.8 Optional fields".
843 * optional-field = field-name ":" unstructured CRLF
844 * field-name = 1*ftext
845 * ftext = %d33-57 / %59-126
847 int ch;
848 char *cp = line->buf;
850 /* Count mbox From headers as headers */
851 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
852 return 1;
854 while ((ch = *cp++)) {
855 if (ch == ':')
856 return 1;
857 if ((33 <= ch && ch <= 57) ||
858 (59 <= ch && ch <= 126))
859 continue;
860 break;
862 return 0;
865 static int read_one_header_line(struct strbuf *line, FILE *in)
867 struct strbuf continuation = STRBUF_INIT;
869 /* Get the first part of the line. */
870 if (strbuf_getline_lf(line, in))
871 return 0;
874 * Is it an empty line or not a valid rfc2822 header?
875 * If so, stop here, and return false ("not a header")
877 strbuf_rtrim(line);
878 if (!line->len || !is_rfc2822_header(line)) {
879 /* Re-add the newline */
880 strbuf_addch(line, '\n');
881 return 0;
885 * Now we need to eat all the continuation lines..
886 * Yuck, 2822 header "folding"
888 for (;;) {
889 int peek;
891 peek = fgetc(in);
892 if (peek == EOF)
893 break;
894 ungetc(peek, in);
895 if (peek != ' ' && peek != '\t')
896 break;
897 if (strbuf_getline_lf(&continuation, in))
898 break;
899 continuation.buf[0] = ' ';
900 strbuf_rtrim(&continuation);
901 strbuf_addbuf(line, &continuation);
903 strbuf_release(&continuation);
905 return 1;
908 static int find_boundary(struct mailinfo *mi, struct strbuf *line)
910 while (!strbuf_getline_lf(line, mi->input)) {
911 if (*(mi->content_top) && is_multipart_boundary(mi, line))
912 return 1;
914 return 0;
917 static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
919 struct strbuf newline = STRBUF_INIT;
921 strbuf_addch(&newline, '\n');
922 again:
923 if (line->len >= (*(mi->content_top))->len + 2 &&
924 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
925 /* we hit an end boundary */
926 /* pop the current boundary off the stack */
927 strbuf_release(*(mi->content_top));
928 FREE_AND_NULL(*(mi->content_top));
930 /* technically won't happen as is_multipart_boundary()
931 will fail first. But just in case..
933 if (--mi->content_top < mi->content) {
934 error("Detected mismatched boundaries, can't recover");
935 mi->input_error = -1;
936 mi->content_top = mi->content;
937 return 0;
939 handle_filter(mi, &newline);
940 strbuf_release(&newline);
941 if (mi->input_error)
942 return 0;
944 /* skip to the next boundary */
945 if (!find_boundary(mi, line))
946 return 0;
947 goto again;
950 /* set some defaults */
951 mi->transfer_encoding = TE_DONTCARE;
952 strbuf_reset(&mi->charset);
954 /* slurp in this section's info */
955 while (read_one_header_line(line, mi->input))
956 check_header(mi, line, mi->p_hdr_data, 0);
958 strbuf_release(&newline);
959 /* replenish line */
960 if (strbuf_getline_lf(line, mi->input))
961 return 0;
962 strbuf_addch(line, '\n');
963 return 1;
966 static void handle_body(struct mailinfo *mi, struct strbuf *line)
968 struct strbuf prev = STRBUF_INIT;
970 /* Skip up to the first boundary */
971 if (*(mi->content_top)) {
972 if (!find_boundary(mi, line))
973 goto handle_body_out;
976 do {
977 /* process any boundary lines */
978 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
979 /* flush any leftover */
980 if (prev.len) {
981 handle_filter(mi, &prev);
982 strbuf_reset(&prev);
984 if (!handle_boundary(mi, line))
985 goto handle_body_out;
988 /* Unwrap transfer encoding */
989 decode_transfer_encoding(mi, line);
991 switch (mi->transfer_encoding) {
992 case TE_BASE64:
993 case TE_QP:
995 struct strbuf **lines, **it, *sb;
997 /* Prepend any previous partial lines */
998 strbuf_insert(line, 0, prev.buf, prev.len);
999 strbuf_reset(&prev);
1002 * This is a decoded line that may contain
1003 * multiple new lines. Pass only one chunk
1004 * at a time to handle_filter()
1006 lines = strbuf_split(line, '\n');
1007 for (it = lines; (sb = *it); it++) {
1008 if (*(it + 1) == NULL) /* The last line */
1009 if (sb->buf[sb->len - 1] != '\n') {
1010 /* Partial line, save it for later. */
1011 strbuf_addbuf(&prev, sb);
1012 break;
1014 handle_filter(mi, sb);
1017 * The partial chunk is saved in "prev" and will be
1018 * appended by the next iteration of read_line_with_nul().
1020 strbuf_list_free(lines);
1021 break;
1023 default:
1024 handle_filter(mi, line);
1027 if (mi->input_error)
1028 break;
1029 } while (!strbuf_getwholeline(line, mi->input, '\n'));
1031 flush_inbody_header_accum(mi);
1033 handle_body_out:
1034 strbuf_release(&prev);
1037 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
1039 const char *sp = data->buf;
1040 while (1) {
1041 char *ep = strchr(sp, '\n');
1042 int len;
1043 if (!ep)
1044 len = strlen(sp);
1045 else
1046 len = ep - sp;
1047 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
1048 if (!ep)
1049 break;
1050 sp = ep + 1;
1054 static void handle_info(struct mailinfo *mi)
1056 struct strbuf *hdr;
1057 int i;
1059 for (i = 0; header[i]; i++) {
1060 /* only print inbody headers if we output a patch file */
1061 if (mi->patch_lines && mi->s_hdr_data[i])
1062 hdr = mi->s_hdr_data[i];
1063 else if (mi->p_hdr_data[i])
1064 hdr = mi->p_hdr_data[i];
1065 else
1066 continue;
1068 if (!strcmp(header[i], "Subject")) {
1069 if (!mi->keep_subject) {
1070 cleanup_subject(mi, hdr);
1071 cleanup_space(hdr);
1073 output_header_lines(mi->output, "Subject", hdr);
1074 } else if (!strcmp(header[i], "From")) {
1075 cleanup_space(hdr);
1076 handle_from(mi, hdr);
1077 fprintf(mi->output, "Author: %s\n", mi->name.buf);
1078 fprintf(mi->output, "Email: %s\n", mi->email.buf);
1079 } else {
1080 cleanup_space(hdr);
1081 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
1084 fprintf(mi->output, "\n");
1087 int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
1089 FILE *cmitmsg;
1090 int peek;
1091 struct strbuf line = STRBUF_INIT;
1093 cmitmsg = fopen(msg, "w");
1094 if (!cmitmsg) {
1095 perror(msg);
1096 return -1;
1098 mi->patchfile = fopen(patch, "w");
1099 if (!mi->patchfile) {
1100 perror(patch);
1101 fclose(cmitmsg);
1102 return -1;
1105 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
1106 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
1108 do {
1109 peek = fgetc(mi->input);
1110 if (peek == EOF) {
1111 fclose(cmitmsg);
1112 return error("empty patch: '%s'", patch);
1114 } while (isspace(peek));
1115 ungetc(peek, mi->input);
1117 /* process the email header */
1118 while (read_one_header_line(&line, mi->input))
1119 check_header(mi, &line, mi->p_hdr_data, 1);
1121 handle_body(mi, &line);
1122 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
1123 fclose(cmitmsg);
1124 fclose(mi->patchfile);
1126 handle_info(mi);
1127 strbuf_release(&line);
1128 return mi->input_error;
1131 static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1133 struct mailinfo *mi = mi_;
1135 if (!starts_with(var, "mailinfo."))
1136 return git_default_config(var, value, NULL);
1137 if (!strcmp(var, "mailinfo.scissors")) {
1138 mi->use_scissors = git_config_bool(var, value);
1139 return 0;
1141 /* perhaps others here */
1142 return 0;
1145 void setup_mailinfo(struct mailinfo *mi)
1147 memset(mi, 0, sizeof(*mi));
1148 strbuf_init(&mi->name, 0);
1149 strbuf_init(&mi->email, 0);
1150 strbuf_init(&mi->charset, 0);
1151 strbuf_init(&mi->log_message, 0);
1152 strbuf_init(&mi->inbody_header_accum, 0);
1153 mi->header_stage = 1;
1154 mi->use_inbody_headers = 1;
1155 mi->content_top = mi->content;
1156 git_config(git_mailinfo_config, mi);
1159 void clear_mailinfo(struct mailinfo *mi)
1161 int i;
1163 strbuf_release(&mi->name);
1164 strbuf_release(&mi->email);
1165 strbuf_release(&mi->charset);
1166 strbuf_release(&mi->inbody_header_accum);
1167 free(mi->message_id);
1169 for (i = 0; mi->p_hdr_data[i]; i++)
1170 strbuf_release(mi->p_hdr_data[i]);
1171 free(mi->p_hdr_data);
1172 for (i = 0; mi->s_hdr_data[i]; i++)
1173 strbuf_release(mi->s_hdr_data[i]);
1174 free(mi->s_hdr_data);
1176 while (mi->content < mi->content_top) {
1177 free(*(mi->content_top));
1178 mi->content_top--;
1181 strbuf_release(&mi->log_message);