Merge branch 'cb/byte-order'
[git/git.git] / builtin / mailinfo.c
1 /*
2 * Another stupid program, this one parsing the headers of an
3 * email to figure out authorship and subject
4 */
5 #include "cache.h"
6 #include "builtin.h"
7 #include "utf8.h"
8 #include "strbuf.h"
9
10 static FILE *cmitmsg, *patchfile, *fin, *fout;
11
12 static int keep_subject;
13 static int keep_non_patch_brackets_in_subject;
14 static const char *metainfo_charset;
15 static struct strbuf line = STRBUF_INIT;
16 static struct strbuf name = STRBUF_INIT;
17 static struct strbuf email = STRBUF_INIT;
18
19 static enum {
20 TE_DONTCARE, TE_QP, TE_BASE64
21 } transfer_encoding;
22
23 static struct strbuf charset = STRBUF_INIT;
24 static int patch_lines;
25 static struct strbuf **p_hdr_data, **s_hdr_data;
26 static int use_scissors;
27 static int use_inbody_headers = 1;
28
29 #define MAX_HDR_PARSED 10
30 #define MAX_BOUNDARIES 5
31
32 static void cleanup_space(struct strbuf *sb);
33
34
35 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
36 {
37 struct strbuf *src = name;
38 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
39 strchr(name->buf, '<') || strchr(name->buf, '>'))
40 src = email;
41 else if (name == out)
42 return;
43 strbuf_reset(out);
44 strbuf_addbuf(out, src);
45 }
46
47 static void parse_bogus_from(const struct strbuf *line)
48 {
49 /* John Doe <johndoe> */
50
51 char *bra, *ket;
52 /* This is fallback, so do not bother if we already have an
53 * e-mail address.
54 */
55 if (email.len)
56 return;
57
58 bra = strchr(line->buf, '<');
59 if (!bra)
60 return;
61 ket = strchr(bra, '>');
62 if (!ket)
63 return;
64
65 strbuf_reset(&email);
66 strbuf_add(&email, bra + 1, ket - bra - 1);
67
68 strbuf_reset(&name);
69 strbuf_add(&name, line->buf, bra - line->buf);
70 strbuf_trim(&name);
71 get_sane_name(&name, &name, &email);
72 }
73
74 static void handle_from(const struct strbuf *from)
75 {
76 char *at;
77 size_t el;
78 struct strbuf f;
79
80 strbuf_init(&f, from->len);
81 strbuf_addbuf(&f, from);
82
83 at = strchr(f.buf, '@');
84 if (!at) {
85 parse_bogus_from(from);
86 return;
87 }
88
89 /*
90 * If we already have one email, don't take any confusing lines
91 */
92 if (email.len && strchr(at + 1, '@')) {
93 strbuf_release(&f);
94 return;
95 }
96
97 /* Pick up the string around '@', possibly delimited with <>
98 * pair; that is the email part.
99 */
100 while (at > f.buf) {
101 char c = at[-1];
102 if (isspace(c))
103 break;
104 if (c == '<') {
105 at[-1] = ' ';
106 break;
107 }
108 at--;
109 }
110 el = strcspn(at, " \n\t\r\v\f>");
111 strbuf_reset(&email);
112 strbuf_add(&email, at, el);
113 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
114
115 /* The remainder is name. It could be
116 *
117 * - "John Doe <john.doe@xz>" (a), or
118 * - "john.doe@xz (John Doe)" (b), or
119 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
120 *
121 * but we have removed the email part, so
122 *
123 * - remove extra spaces which could stay after email (case 'c'), and
124 * - trim from both ends, possibly removing the () pair at the end
125 * (cases 'a' and 'b').
126 */
127 cleanup_space(&f);
128 strbuf_trim(&f);
129 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
130 strbuf_remove(&f, 0, 1);
131 strbuf_setlen(&f, f.len - 1);
132 }
133
134 get_sane_name(&name, &f, &email);
135 strbuf_release(&f);
136 }
137
138 static void handle_header(struct strbuf **out, const struct strbuf *line)
139 {
140 if (!*out) {
141 *out = xmalloc(sizeof(struct strbuf));
142 strbuf_init(*out, line->len);
143 } else
144 strbuf_reset(*out);
145
146 strbuf_addbuf(*out, line);
147 }
148
149 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
150 * to have enough heuristics to grok MIME encoded patches often found
151 * on our mailing lists. For example, we do not even treat header lines
152 * case insensitively.
153 */
154
155 static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
156 {
157 const char *ends, *ap = strcasestr(line, name);
158 size_t sz;
159
160 strbuf_setlen(attr, 0);
161 if (!ap)
162 return 0;
163 ap += strlen(name);
164 if (*ap == '"') {
165 ap++;
166 ends = "\"";
167 }
168 else
169 ends = "; \t";
170 sz = strcspn(ap, ends);
171 strbuf_add(attr, ap, sz);
172 return 1;
173 }
174
175 static struct strbuf *content[MAX_BOUNDARIES];
176
177 static struct strbuf **content_top = content;
178
179 static void handle_content_type(struct strbuf *line)
180 {
181 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
182 strbuf_init(boundary, line->len);
183
184 if (slurp_attr(line->buf, "boundary=", boundary)) {
185 strbuf_insert(boundary, 0, "--", 2);
186 if (++content_top > &content[MAX_BOUNDARIES]) {
187 fprintf(stderr, "Too many boundaries to handle\n");
188 exit(1);
189 }
190 *content_top = boundary;
191 boundary = NULL;
192 }
193 slurp_attr(line->buf, "charset=", &charset);
194
195 if (boundary) {
196 strbuf_release(boundary);
197 free(boundary);
198 }
199 }
200
201 static void handle_content_transfer_encoding(const struct strbuf *line)
202 {
203 if (strcasestr(line->buf, "base64"))
204 transfer_encoding = TE_BASE64;
205 else if (strcasestr(line->buf, "quoted-printable"))
206 transfer_encoding = TE_QP;
207 else
208 transfer_encoding = TE_DONTCARE;
209 }
210
211 static int is_multipart_boundary(const struct strbuf *line)
212 {
213 return (((*content_top)->len <= line->len) &&
214 !memcmp(line->buf, (*content_top)->buf, (*content_top)->len));
215 }
216
217 static void cleanup_subject(struct strbuf *subject)
218 {
219 size_t at = 0;
220
221 while (at < subject->len) {
222 char *pos;
223 size_t remove;
224
225 switch (subject->buf[at]) {
226 case 'r': case 'R':
227 if (subject->len <= at + 3)
228 break;
229 if ((subject->buf[at + 1] == 'e' ||
230 subject->buf[at + 1] == 'E') &&
231 subject->buf[at + 2] == ':') {
232 strbuf_remove(subject, at, 3);
233 continue;
234 }
235 at++;
236 break;
237 case ' ': case '\t': case ':':
238 strbuf_remove(subject, at, 1);
239 continue;
240 case '[':
241 pos = strchr(subject->buf + at, ']');
242 if (!pos)
243 break;
244 remove = pos - subject->buf + at + 1;
245 if (!keep_non_patch_brackets_in_subject ||
246 (7 <= remove &&
247 memmem(subject->buf + at, remove, "PATCH", 5)))
248 strbuf_remove(subject, at, remove);
249 else {
250 at += remove;
251 /*
252 * If the input had a space after the ], keep
253 * it. We don't bother with finding the end of
254 * the space, since we later normalize it
255 * anyway.
256 */
257 if (isspace(subject->buf[at]))
258 at += 1;
259 }
260 continue;
261 }
262 break;
263 }
264 strbuf_trim(subject);
265 }
266
267 static void cleanup_space(struct strbuf *sb)
268 {
269 size_t pos, cnt;
270 for (pos = 0; pos < sb->len; pos++) {
271 if (isspace(sb->buf[pos])) {
272 sb->buf[pos] = ' ';
273 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
274 strbuf_remove(sb, pos + 1, cnt);
275 }
276 }
277 }
278
279 static void decode_header(struct strbuf *line);
280 static const char *header[MAX_HDR_PARSED] = {
281 "From","Subject","Date",
282 };
283
284 static inline int cmp_header(const struct strbuf *line, const char *hdr)
285 {
286 int len = strlen(hdr);
287 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
288 line->buf[len] == ':' && isspace(line->buf[len + 1]);
289 }
290
291 static int check_header(const struct strbuf *line,
292 struct strbuf *hdr_data[], int overwrite)
293 {
294 int i, ret = 0, len;
295 struct strbuf sb = STRBUF_INIT;
296 /* search for the interesting parts */
297 for (i = 0; header[i]; i++) {
298 int len = strlen(header[i]);
299 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
300 /* Unwrap inline B and Q encoding, and optionally
301 * normalize the meta information to utf8.
302 */
303 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
304 decode_header(&sb);
305 handle_header(&hdr_data[i], &sb);
306 ret = 1;
307 goto check_header_out;
308 }
309 }
310
311 /* Content stuff */
312 if (cmp_header(line, "Content-Type")) {
313 len = strlen("Content-Type: ");
314 strbuf_add(&sb, line->buf + len, line->len - len);
315 decode_header(&sb);
316 strbuf_insert(&sb, 0, "Content-Type: ", len);
317 handle_content_type(&sb);
318 ret = 1;
319 goto check_header_out;
320 }
321 if (cmp_header(line, "Content-Transfer-Encoding")) {
322 len = strlen("Content-Transfer-Encoding: ");
323 strbuf_add(&sb, line->buf + len, line->len - len);
324 decode_header(&sb);
325 handle_content_transfer_encoding(&sb);
326 ret = 1;
327 goto check_header_out;
328 }
329
330 /* for inbody stuff */
331 if (starts_with(line->buf, ">From") && isspace(line->buf[5])) {
332 ret = 1; /* Should this return 0? */
333 goto check_header_out;
334 }
335 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
336 for (i = 0; header[i]; i++) {
337 if (!strcmp("Subject", header[i])) {
338 handle_header(&hdr_data[i], line);
339 ret = 1;
340 goto check_header_out;
341 }
342 }
343 }
344
345 check_header_out:
346 strbuf_release(&sb);
347 return ret;
348 }
349
350 static int is_rfc2822_header(const struct strbuf *line)
351 {
352 /*
353 * The section that defines the loosest possible
354 * field name is "3.6.8 Optional fields".
355 *
356 * optional-field = field-name ":" unstructured CRLF
357 * field-name = 1*ftext
358 * ftext = %d33-57 / %59-126
359 */
360 int ch;
361 char *cp = line->buf;
362
363 /* Count mbox From headers as headers */
364 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
365 return 1;
366
367 while ((ch = *cp++)) {
368 if (ch == ':')
369 return 1;
370 if ((33 <= ch && ch <= 57) ||
371 (59 <= ch && ch <= 126))
372 continue;
373 break;
374 }
375 return 0;
376 }
377
378 static int read_one_header_line(struct strbuf *line, FILE *in)
379 {
380 /* Get the first part of the line. */
381 if (strbuf_getline(line, in, '\n'))
382 return 0;
383
384 /*
385 * Is it an empty line or not a valid rfc2822 header?
386 * If so, stop here, and return false ("not a header")
387 */
388 strbuf_rtrim(line);
389 if (!line->len || !is_rfc2822_header(line)) {
390 /* Re-add the newline */
391 strbuf_addch(line, '\n');
392 return 0;
393 }
394
395 /*
396 * Now we need to eat all the continuation lines..
397 * Yuck, 2822 header "folding"
398 */
399 for (;;) {
400 int peek;
401 struct strbuf continuation = STRBUF_INIT;
402
403 peek = fgetc(in); ungetc(peek, in);
404 if (peek != ' ' && peek != '\t')
405 break;
406 if (strbuf_getline(&continuation, in, '\n'))
407 break;
408 continuation.buf[0] = ' ';
409 strbuf_rtrim(&continuation);
410 strbuf_addbuf(line, &continuation);
411 }
412
413 return 1;
414 }
415
416 static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
417 {
418 const char *in = q_seg->buf;
419 int c;
420 struct strbuf *out = xmalloc(sizeof(struct strbuf));
421 strbuf_init(out, q_seg->len);
422
423 while ((c = *in++) != 0) {
424 if (c == '=') {
425 int d = *in++;
426 if (d == '\n' || !d)
427 break; /* drop trailing newline */
428 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
429 continue;
430 }
431 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
432 c = 0x20;
433 strbuf_addch(out, c);
434 }
435 return out;
436 }
437
438 static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
439 {
440 /* Decode in..ep, possibly in-place to ot */
441 int c, pos = 0, acc = 0;
442 const char *in = b_seg->buf;
443 struct strbuf *out = xmalloc(sizeof(struct strbuf));
444 strbuf_init(out, b_seg->len);
445
446 while ((c = *in++) != 0) {
447 if (c == '+')
448 c = 62;
449 else if (c == '/')
450 c = 63;
451 else if ('A' <= c && c <= 'Z')
452 c -= 'A';
453 else if ('a' <= c && c <= 'z')
454 c -= 'a' - 26;
455 else if ('0' <= c && c <= '9')
456 c -= '0' - 52;
457 else
458 continue; /* garbage */
459 switch (pos++) {
460 case 0:
461 acc = (c << 2);
462 break;
463 case 1:
464 strbuf_addch(out, (acc | (c >> 4)));
465 acc = (c & 15) << 4;
466 break;
467 case 2:
468 strbuf_addch(out, (acc | (c >> 2)));
469 acc = (c & 3) << 6;
470 break;
471 case 3:
472 strbuf_addch(out, (acc | c));
473 acc = pos = 0;
474 break;
475 }
476 }
477 return out;
478 }
479
480 static void convert_to_utf8(struct strbuf *line, const char *charset)
481 {
482 char *out;
483
484 if (!charset || !*charset)
485 return;
486
487 if (same_encoding(metainfo_charset, charset))
488 return;
489 out = reencode_string(line->buf, metainfo_charset, charset);
490 if (!out)
491 die("cannot convert from %s to %s",
492 charset, metainfo_charset);
493 strbuf_attach(line, out, strlen(out), strlen(out));
494 }
495
496 static int decode_header_bq(struct strbuf *it)
497 {
498 char *in, *ep, *cp;
499 struct strbuf outbuf = STRBUF_INIT, *dec;
500 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
501 int rfc2047 = 0;
502
503 in = it->buf;
504 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
505 int encoding;
506 strbuf_reset(&charset_q);
507 strbuf_reset(&piecebuf);
508 rfc2047 = 1;
509
510 if (in != ep) {
511 /*
512 * We are about to process an encoded-word
513 * that begins at ep, but there is something
514 * before the encoded word.
515 */
516 char *scan;
517 for (scan = in; scan < ep; scan++)
518 if (!isspace(*scan))
519 break;
520
521 if (scan != ep || in == it->buf) {
522 /*
523 * We should not lose that "something",
524 * unless we have just processed an
525 * encoded-word, and there is only LWS
526 * before the one we are about to process.
527 */
528 strbuf_add(&outbuf, in, ep - in);
529 }
530 }
531 /* E.g.
532 * ep : "=?iso-2022-jp?B?GyR...?= foo"
533 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
534 */
535 ep += 2;
536
537 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
538 goto decode_header_bq_out;
539
540 if (cp + 3 - it->buf > it->len)
541 goto decode_header_bq_out;
542 strbuf_add(&charset_q, ep, cp - ep);
543
544 encoding = cp[1];
545 if (!encoding || cp[2] != '?')
546 goto decode_header_bq_out;
547 ep = strstr(cp + 3, "?=");
548 if (!ep)
549 goto decode_header_bq_out;
550 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
551 switch (tolower(encoding)) {
552 default:
553 goto decode_header_bq_out;
554 case 'b':
555 dec = decode_b_segment(&piecebuf);
556 break;
557 case 'q':
558 dec = decode_q_segment(&piecebuf, 1);
559 break;
560 }
561 if (metainfo_charset)
562 convert_to_utf8(dec, charset_q.buf);
563
564 strbuf_addbuf(&outbuf, dec);
565 strbuf_release(dec);
566 free(dec);
567 in = ep + 2;
568 }
569 strbuf_addstr(&outbuf, in);
570 strbuf_reset(it);
571 strbuf_addbuf(it, &outbuf);
572 decode_header_bq_out:
573 strbuf_release(&outbuf);
574 strbuf_release(&charset_q);
575 strbuf_release(&piecebuf);
576 return rfc2047;
577 }
578
579 static void decode_header(struct strbuf *it)
580 {
581 if (decode_header_bq(it))
582 return;
583 /* otherwise "it" is a straight copy of the input.
584 * This can be binary guck but there is no charset specified.
585 */
586 if (metainfo_charset)
587 convert_to_utf8(it, "");
588 }
589
590 static void decode_transfer_encoding(struct strbuf *line)
591 {
592 struct strbuf *ret;
593
594 switch (transfer_encoding) {
595 case TE_QP:
596 ret = decode_q_segment(line, 0);
597 break;
598 case TE_BASE64:
599 ret = decode_b_segment(line);
600 break;
601 case TE_DONTCARE:
602 default:
603 return;
604 }
605 strbuf_reset(line);
606 strbuf_addbuf(line, ret);
607 strbuf_release(ret);
608 free(ret);
609 }
610
611 static void handle_filter(struct strbuf *line);
612
613 static int find_boundary(void)
614 {
615 while (!strbuf_getline(&line, fin, '\n')) {
616 if (*content_top && is_multipart_boundary(&line))
617 return 1;
618 }
619 return 0;
620 }
621
622 static int handle_boundary(void)
623 {
624 struct strbuf newline = STRBUF_INIT;
625
626 strbuf_addch(&newline, '\n');
627 again:
628 if (line.len >= (*content_top)->len + 2 &&
629 !memcmp(line.buf + (*content_top)->len, "--", 2)) {
630 /* we hit an end boundary */
631 /* pop the current boundary off the stack */
632 strbuf_release(*content_top);
633 free(*content_top);
634 *content_top = NULL;
635
636 /* technically won't happen as is_multipart_boundary()
637 will fail first. But just in case..
638 */
639 if (--content_top < content) {
640 fprintf(stderr, "Detected mismatched boundaries, "
641 "can't recover\n");
642 exit(1);
643 }
644 handle_filter(&newline);
645 strbuf_release(&newline);
646
647 /* skip to the next boundary */
648 if (!find_boundary())
649 return 0;
650 goto again;
651 }
652
653 /* set some defaults */
654 transfer_encoding = TE_DONTCARE;
655 strbuf_reset(&charset);
656
657 /* slurp in this section's info */
658 while (read_one_header_line(&line, fin))
659 check_header(&line, p_hdr_data, 0);
660
661 strbuf_release(&newline);
662 /* replenish line */
663 if (strbuf_getline(&line, fin, '\n'))
664 return 0;
665 strbuf_addch(&line, '\n');
666 return 1;
667 }
668
669 static inline int patchbreak(const struct strbuf *line)
670 {
671 size_t i;
672
673 /* Beginning of a "diff -" header? */
674 if (starts_with(line->buf, "diff -"))
675 return 1;
676
677 /* CVS "Index: " line? */
678 if (starts_with(line->buf, "Index: "))
679 return 1;
680
681 /*
682 * "--- <filename>" starts patches without headers
683 * "---<sp>*" is a manual separator
684 */
685 if (line->len < 4)
686 return 0;
687
688 if (starts_with(line->buf, "---")) {
689 /* space followed by a filename? */
690 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
691 return 1;
692 /* Just whitespace? */
693 for (i = 3; i < line->len; i++) {
694 unsigned char c = line->buf[i];
695 if (c == '\n')
696 return 1;
697 if (!isspace(c))
698 break;
699 }
700 return 0;
701 }
702 return 0;
703 }
704
705 static int is_scissors_line(const struct strbuf *line)
706 {
707 size_t i, len = line->len;
708 int scissors = 0, gap = 0;
709 int first_nonblank = -1;
710 int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
711 const char *buf = line->buf;
712
713 for (i = 0; i < len; i++) {
714 if (isspace(buf[i])) {
715 if (in_perforation) {
716 perforation++;
717 gap++;
718 }
719 continue;
720 }
721 last_nonblank = i;
722 if (first_nonblank < 0)
723 first_nonblank = i;
724 if (buf[i] == '-') {
725 in_perforation = 1;
726 perforation++;
727 continue;
728 }
729 if (i + 1 < len &&
730 (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
731 !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
732 in_perforation = 1;
733 perforation += 2;
734 scissors += 2;
735 i++;
736 continue;
737 }
738 in_perforation = 0;
739 }
740
741 /*
742 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
743 * Even though there can be arbitrary cruft on the same line
744 * (e.g. "cut here"), in order to avoid misidentification, the
745 * perforation must occupy more than a third of the visible
746 * width of the line, and dashes and scissors must occupy more
747 * than half of the perforation.
748 */
749
750 visible = last_nonblank - first_nonblank + 1;
751 return (scissors && 8 <= visible &&
752 visible < perforation * 3 &&
753 gap * 2 < perforation);
754 }
755
756 static int handle_commit_msg(struct strbuf *line)
757 {
758 static int still_looking = 1;
759
760 if (!cmitmsg)
761 return 0;
762
763 if (still_looking) {
764 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
765 return 0;
766 }
767
768 if (use_inbody_headers && still_looking) {
769 still_looking = check_header(line, s_hdr_data, 0);
770 if (still_looking)
771 return 0;
772 } else
773 /* Only trim the first (blank) line of the commit message
774 * when ignoring in-body headers.
775 */
776 still_looking = 0;
777
778 /* normalize the log message to UTF-8. */
779 if (metainfo_charset)
780 convert_to_utf8(line, charset.buf);
781
782 if (use_scissors && is_scissors_line(line)) {
783 int i;
784 if (fseek(cmitmsg, 0L, SEEK_SET))
785 die_errno("Could not rewind output message file");
786 if (ftruncate(fileno(cmitmsg), 0))
787 die_errno("Could not truncate output message file at scissors");
788 still_looking = 1;
789
790 /*
791 * We may have already read "secondary headers"; purge
792 * them to give ourselves a clean restart.
793 */
794 for (i = 0; header[i]; i++) {
795 if (s_hdr_data[i])
796 strbuf_release(s_hdr_data[i]);
797 s_hdr_data[i] = NULL;
798 }
799 return 0;
800 }
801
802 if (patchbreak(line)) {
803 fclose(cmitmsg);
804 cmitmsg = NULL;
805 return 1;
806 }
807
808 fputs(line->buf, cmitmsg);
809 return 0;
810 }
811
812 static void handle_patch(const struct strbuf *line)
813 {
814 fwrite(line->buf, 1, line->len, patchfile);
815 patch_lines++;
816 }
817
818 static void handle_filter(struct strbuf *line)
819 {
820 static int filter = 0;
821
822 /* filter tells us which part we left off on */
823 switch (filter) {
824 case 0:
825 if (!handle_commit_msg(line))
826 break;
827 filter++;
828 case 1:
829 handle_patch(line);
830 break;
831 }
832 }
833
834 static void handle_body(void)
835 {
836 struct strbuf prev = STRBUF_INIT;
837
838 /* Skip up to the first boundary */
839 if (*content_top) {
840 if (!find_boundary())
841 goto handle_body_out;
842 }
843
844 do {
845 /* process any boundary lines */
846 if (*content_top && is_multipart_boundary(&line)) {
847 /* flush any leftover */
848 if (prev.len) {
849 handle_filter(&prev);
850 strbuf_reset(&prev);
851 }
852 if (!handle_boundary())
853 goto handle_body_out;
854 }
855
856 /* Unwrap transfer encoding */
857 decode_transfer_encoding(&line);
858
859 switch (transfer_encoding) {
860 case TE_BASE64:
861 case TE_QP:
862 {
863 struct strbuf **lines, **it, *sb;
864
865 /* Prepend any previous partial lines */
866 strbuf_insert(&line, 0, prev.buf, prev.len);
867 strbuf_reset(&prev);
868
869 /*
870 * This is a decoded line that may contain
871 * multiple new lines. Pass only one chunk
872 * at a time to handle_filter()
873 */
874 lines = strbuf_split(&line, '\n');
875 for (it = lines; (sb = *it); it++) {
876 if (*(it + 1) == NULL) /* The last line */
877 if (sb->buf[sb->len - 1] != '\n') {
878 /* Partial line, save it for later. */
879 strbuf_addbuf(&prev, sb);
880 break;
881 }
882 handle_filter(sb);
883 }
884 /*
885 * The partial chunk is saved in "prev" and will be
886 * appended by the next iteration of read_line_with_nul().
887 */
888 strbuf_list_free(lines);
889 break;
890 }
891 default:
892 handle_filter(&line);
893 }
894
895 } while (!strbuf_getwholeline(&line, fin, '\n'));
896
897 handle_body_out:
898 strbuf_release(&prev);
899 }
900
901 static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
902 {
903 const char *sp = data->buf;
904 while (1) {
905 char *ep = strchr(sp, '\n');
906 int len;
907 if (!ep)
908 len = strlen(sp);
909 else
910 len = ep - sp;
911 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
912 if (!ep)
913 break;
914 sp = ep + 1;
915 }
916 }
917
918 static void handle_info(void)
919 {
920 struct strbuf *hdr;
921 int i;
922
923 for (i = 0; header[i]; i++) {
924 /* only print inbody headers if we output a patch file */
925 if (patch_lines && s_hdr_data[i])
926 hdr = s_hdr_data[i];
927 else if (p_hdr_data[i])
928 hdr = p_hdr_data[i];
929 else
930 continue;
931
932 if (!strcmp(header[i], "Subject")) {
933 if (!keep_subject) {
934 cleanup_subject(hdr);
935 cleanup_space(hdr);
936 }
937 output_header_lines(fout, "Subject", hdr);
938 } else if (!strcmp(header[i], "From")) {
939 cleanup_space(hdr);
940 handle_from(hdr);
941 fprintf(fout, "Author: %s\n", name.buf);
942 fprintf(fout, "Email: %s\n", email.buf);
943 } else {
944 cleanup_space(hdr);
945 fprintf(fout, "%s: %s\n", header[i], hdr->buf);
946 }
947 }
948 fprintf(fout, "\n");
949 }
950
951 static int mailinfo(FILE *in, FILE *out, const char *msg, const char *patch)
952 {
953 int peek;
954 fin = in;
955 fout = out;
956
957 cmitmsg = fopen(msg, "w");
958 if (!cmitmsg) {
959 perror(msg);
960 return -1;
961 }
962 patchfile = fopen(patch, "w");
963 if (!patchfile) {
964 perror(patch);
965 fclose(cmitmsg);
966 return -1;
967 }
968
969 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));
970 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));
971
972 do {
973 peek = fgetc(in);
974 } while (isspace(peek));
975 ungetc(peek, in);
976
977 /* process the email header */
978 while (read_one_header_line(&line, fin))
979 check_header(&line, p_hdr_data, 1);
980
981 handle_body();
982 handle_info();
983
984 return 0;
985 }
986
987 static int git_mailinfo_config(const char *var, const char *value, void *unused)
988 {
989 if (!starts_with(var, "mailinfo."))
990 return git_default_config(var, value, unused);
991 if (!strcmp(var, "mailinfo.scissors")) {
992 use_scissors = git_config_bool(var, value);
993 return 0;
994 }
995 /* perhaps others here */
996 return 0;
997 }
998
999 static const char mailinfo_usage[] =
1000 "git mailinfo [-k|-b] [-u | --encoding=<encoding> | -n] [--scissors | --no-scissors] msg patch < mail >info";
1001
1002 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
1003 {
1004 const char *def_charset;
1005
1006 /* NEEDSWORK: might want to do the optional .git/ directory
1007 * discovery
1008 */
1009 git_config(git_mailinfo_config, NULL);
1010
1011 def_charset = get_commit_output_encoding();
1012 metainfo_charset = def_charset;
1013
1014 while (1 < argc && argv[1][0] == '-') {
1015 if (!strcmp(argv[1], "-k"))
1016 keep_subject = 1;
1017 else if (!strcmp(argv[1], "-b"))
1018 keep_non_patch_brackets_in_subject = 1;
1019 else if (!strcmp(argv[1], "-u"))
1020 metainfo_charset = def_charset;
1021 else if (!strcmp(argv[1], "-n"))
1022 metainfo_charset = NULL;
1023 else if (starts_with(argv[1], "--encoding="))
1024 metainfo_charset = argv[1] + 11;
1025 else if (!strcmp(argv[1], "--scissors"))
1026 use_scissors = 1;
1027 else if (!strcmp(argv[1], "--no-scissors"))
1028 use_scissors = 0;
1029 else if (!strcmp(argv[1], "--no-inbody-headers"))
1030 use_inbody_headers = 0;
1031 else
1032 usage(mailinfo_usage);
1033 argc--; argv++;
1034 }
1035
1036 if (argc != 3)
1037 usage(mailinfo_usage);
1038
1039 return !!mailinfo(stdin, stdout, argv[1], argv[2]);
1040 }