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
10static FILE *cmitmsg, *patchfile, *fin, *fout;
11
12static int keep_subject;
13static int keep_non_patch_brackets_in_subject;
14static const char *metainfo_charset;
15static struct strbuf line = STRBUF_INIT;
16static struct strbuf name = STRBUF_INIT;
17static struct strbuf email = STRBUF_INIT;
18
19static enum {
20 TE_DONTCARE, TE_QP, TE_BASE64
21} transfer_encoding;
22
23static struct strbuf charset = STRBUF_INIT;
24static int patch_lines;
25static struct strbuf **p_hdr_data, **s_hdr_data;
26static int use_scissors;
27static int use_inbody_headers = 1;
28
29#define MAX_HDR_PARSED 10
30#define MAX_BOUNDARIES 5
31
32static void cleanup_space(struct strbuf *sb);
33
34
35static 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
47static 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
74static 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
138static 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
155static 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
175static struct strbuf *content[MAX_BOUNDARIES];
176
177static struct strbuf **content_top = content;
178
179static 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
201static 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
211static 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
217static 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
267static 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
279static void decode_header(struct strbuf *line);
280static const char *header[MAX_HDR_PARSED] = {
281 "From","Subject","Date",
282};
283
284static 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
291static 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 (!prefixcmp(line->buf, ">From") && isspace(line->buf[5])) {
332 ret = 1; /* Should this return 0? */
333 goto check_header_out;
334 }
335 if (!prefixcmp(line->buf, "[PATCH]") && isspace(line->buf[7])) {
336 for (i = 0; header[i]; i++) {
337 if (!memcmp("Subject", header[i], 7)) {
338 handle_header(&hdr_data[i], line);
339 ret = 1;
340 goto check_header_out;
341 }
342 }
343 }
344
345check_header_out:
346 strbuf_release(&sb);
347 return ret;
348}
349
350static 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 (!prefixcmp(cp, "From ") || !prefixcmp(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
378static 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
416static 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
438static 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/*
481 * When there is no known charset, guess.
482 *
483 * Right now we assume that if the target is UTF-8 (the default),
484 * and it already looks like UTF-8 (which includes US-ASCII as its
485 * subset, of course) then that is what it is and there is nothing
486 * to do.
487 *
488 * Otherwise, we default to assuming it is Latin1 for historical
489 * reasons.
490 */
491static const char *guess_charset(const struct strbuf *line, const char *target_charset)
492{
493 if (is_encoding_utf8(target_charset)) {
494 if (is_utf8(line->buf))
495 return NULL;
496 }
497 return "ISO8859-1";
498}
499
500static void convert_to_utf8(struct strbuf *line, const char *charset)
501{
502 char *out;
503
504 if (!charset || !*charset) {
505 charset = guess_charset(line, metainfo_charset);
506 if (!charset)
507 return;
508 }
509
510 if (!strcasecmp(metainfo_charset, charset))
511 return;
512 out = reencode_string(line->buf, metainfo_charset, charset);
513 if (!out)
514 die("cannot convert from %s to %s",
515 charset, metainfo_charset);
516 strbuf_attach(line, out, strlen(out), strlen(out));
517}
518
519static int decode_header_bq(struct strbuf *it)
520{
521 char *in, *ep, *cp;
522 struct strbuf outbuf = STRBUF_INIT, *dec;
523 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
524 int rfc2047 = 0;
525
526 in = it->buf;
527 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
528 int encoding;
529 strbuf_reset(&charset_q);
530 strbuf_reset(&piecebuf);
531 rfc2047 = 1;
532
533 if (in != ep) {
534 /*
535 * We are about to process an encoded-word
536 * that begins at ep, but there is something
537 * before the encoded word.
538 */
539 char *scan;
540 for (scan = in; scan < ep; scan++)
541 if (!isspace(*scan))
542 break;
543
544 if (scan != ep || in == it->buf) {
545 /*
546 * We should not lose that "something",
547 * unless we have just processed an
548 * encoded-word, and there is only LWS
549 * before the one we are about to process.
550 */
551 strbuf_add(&outbuf, in, ep - in);
552 }
553 }
554 /* E.g.
555 * ep : "=?iso-2022-jp?B?GyR...?= foo"
556 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
557 */
558 ep += 2;
559
560 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
561 goto decode_header_bq_out;
562
563 if (cp + 3 - it->buf > it->len)
564 goto decode_header_bq_out;
565 strbuf_add(&charset_q, ep, cp - ep);
566
567 encoding = cp[1];
568 if (!encoding || cp[2] != '?')
569 goto decode_header_bq_out;
570 ep = strstr(cp + 3, "?=");
571 if (!ep)
572 goto decode_header_bq_out;
573 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
574 switch (tolower(encoding)) {
575 default:
576 goto decode_header_bq_out;
577 case 'b':
578 dec = decode_b_segment(&piecebuf);
579 break;
580 case 'q':
581 dec = decode_q_segment(&piecebuf, 1);
582 break;
583 }
584 if (metainfo_charset)
585 convert_to_utf8(dec, charset_q.buf);
586
587 strbuf_addbuf(&outbuf, dec);
588 strbuf_release(dec);
589 free(dec);
590 in = ep + 2;
591 }
592 strbuf_addstr(&outbuf, in);
593 strbuf_reset(it);
594 strbuf_addbuf(it, &outbuf);
595decode_header_bq_out:
596 strbuf_release(&outbuf);
597 strbuf_release(&charset_q);
598 strbuf_release(&piecebuf);
599 return rfc2047;
600}
601
602static void decode_header(struct strbuf *it)
603{
604 if (decode_header_bq(it))
605 return;
606 /* otherwise "it" is a straight copy of the input.
607 * This can be binary guck but there is no charset specified.
608 */
609 if (metainfo_charset)
610 convert_to_utf8(it, "");
611}
612
613static void decode_transfer_encoding(struct strbuf *line)
614{
615 struct strbuf *ret;
616
617 switch (transfer_encoding) {
618 case TE_QP:
619 ret = decode_q_segment(line, 0);
620 break;
621 case TE_BASE64:
622 ret = decode_b_segment(line);
623 break;
624 case TE_DONTCARE:
625 default:
626 return;
627 }
628 strbuf_reset(line);
629 strbuf_addbuf(line, ret);
630 strbuf_release(ret);
631 free(ret);
632}
633
634static void handle_filter(struct strbuf *line);
635
636static int find_boundary(void)
637{
638 while (!strbuf_getline(&line, fin, '\n')) {
639 if (*content_top && is_multipart_boundary(&line))
640 return 1;
641 }
642 return 0;
643}
644
645static int handle_boundary(void)
646{
647 struct strbuf newline = STRBUF_INIT;
648
649 strbuf_addch(&newline, '\n');
650again:
651 if (line.len >= (*content_top)->len + 2 &&
652 !memcmp(line.buf + (*content_top)->len, "--", 2)) {
653 /* we hit an end boundary */
654 /* pop the current boundary off the stack */
655 strbuf_release(*content_top);
656 free(*content_top);
657 *content_top = NULL;
658
659 /* technically won't happen as is_multipart_boundary()
660 will fail first. But just in case..
661 */
662 if (--content_top < content) {
663 fprintf(stderr, "Detected mismatched boundaries, "
664 "can't recover\n");
665 exit(1);
666 }
667 handle_filter(&newline);
668 strbuf_release(&newline);
669
670 /* skip to the next boundary */
671 if (!find_boundary())
672 return 0;
673 goto again;
674 }
675
676 /* set some defaults */
677 transfer_encoding = TE_DONTCARE;
678 strbuf_reset(&charset);
679
680 /* slurp in this section's info */
681 while (read_one_header_line(&line, fin))
682 check_header(&line, p_hdr_data, 0);
683
684 strbuf_release(&newline);
685 /* replenish line */
686 if (strbuf_getline(&line, fin, '\n'))
687 return 0;
688 strbuf_addch(&line, '\n');
689 return 1;
690}
691
692static inline int patchbreak(const struct strbuf *line)
693{
694 size_t i;
695
696 /* Beginning of a "diff -" header? */
697 if (!prefixcmp(line->buf, "diff -"))
698 return 1;
699
700 /* CVS "Index: " line? */
701 if (!prefixcmp(line->buf, "Index: "))
702 return 1;
703
704 /*
705 * "--- <filename>" starts patches without headers
706 * "---<sp>*" is a manual separator
707 */
708 if (line->len < 4)
709 return 0;
710
711 if (!prefixcmp(line->buf, "---")) {
712 /* space followed by a filename? */
713 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
714 return 1;
715 /* Just whitespace? */
716 for (i = 3; i < line->len; i++) {
717 unsigned char c = line->buf[i];
718 if (c == '\n')
719 return 1;
720 if (!isspace(c))
721 break;
722 }
723 return 0;
724 }
725 return 0;
726}
727
728static int is_scissors_line(const struct strbuf *line)
729{
730 size_t i, len = line->len;
731 int scissors = 0, gap = 0;
732 int first_nonblank = -1;
733 int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
734 const char *buf = line->buf;
735
736 for (i = 0; i < len; i++) {
737 if (isspace(buf[i])) {
738 if (in_perforation) {
739 perforation++;
740 gap++;
741 }
742 continue;
743 }
744 last_nonblank = i;
745 if (first_nonblank < 0)
746 first_nonblank = i;
747 if (buf[i] == '-') {
748 in_perforation = 1;
749 perforation++;
750 continue;
751 }
752 if (i + 1 < len &&
753 (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
754 !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
755 in_perforation = 1;
756 perforation += 2;
757 scissors += 2;
758 i++;
759 continue;
760 }
761 in_perforation = 0;
762 }
763
764 /*
765 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
766 * Even though there can be arbitrary cruft on the same line
767 * (e.g. "cut here"), in order to avoid misidentification, the
768 * perforation must occupy more than a third of the visible
769 * width of the line, and dashes and scissors must occupy more
770 * than half of the perforation.
771 */
772
773 visible = last_nonblank - first_nonblank + 1;
774 return (scissors && 8 <= visible &&
775 visible < perforation * 3 &&
776 gap * 2 < perforation);
777}
778
779static int handle_commit_msg(struct strbuf *line)
780{
781 static int still_looking = 1;
782
783 if (!cmitmsg)
784 return 0;
785
786 if (still_looking) {
787 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
788 return 0;
789 }
790
791 if (use_inbody_headers && still_looking) {
792 still_looking = check_header(line, s_hdr_data, 0);
793 if (still_looking)
794 return 0;
795 } else
796 /* Only trim the first (blank) line of the commit message
797 * when ignoring in-body headers.
798 */
799 still_looking = 0;
800
801 /* normalize the log message to UTF-8. */
802 if (metainfo_charset)
803 convert_to_utf8(line, charset.buf);
804
805 if (use_scissors && is_scissors_line(line)) {
806 int i;
807 if (fseek(cmitmsg, 0L, SEEK_SET))
808 die_errno("Could not rewind output message file");
809 if (ftruncate(fileno(cmitmsg), 0))
810 die_errno("Could not truncate output message file at scissors");
811 still_looking = 1;
812
813 /*
814 * We may have already read "secondary headers"; purge
815 * them to give ourselves a clean restart.
816 */
817 for (i = 0; header[i]; i++) {
818 if (s_hdr_data[i])
819 strbuf_release(s_hdr_data[i]);
820 s_hdr_data[i] = NULL;
821 }
822 return 0;
823 }
824
825 if (patchbreak(line)) {
826 fclose(cmitmsg);
827 cmitmsg = NULL;
828 return 1;
829 }
830
831 fputs(line->buf, cmitmsg);
832 return 0;
833}
834
835static void handle_patch(const struct strbuf *line)
836{
837 fwrite(line->buf, 1, line->len, patchfile);
838 patch_lines++;
839}
840
841static void handle_filter(struct strbuf *line)
842{
843 static int filter = 0;
844
845 /* filter tells us which part we left off on */
846 switch (filter) {
847 case 0:
848 if (!handle_commit_msg(line))
849 break;
850 filter++;
851 case 1:
852 handle_patch(line);
853 break;
854 }
855}
856
857static void handle_body(void)
858{
859 struct strbuf prev = STRBUF_INIT;
860
861 /* Skip up to the first boundary */
862 if (*content_top) {
863 if (!find_boundary())
864 goto handle_body_out;
865 }
866
867 do {
868 /* process any boundary lines */
869 if (*content_top && is_multipart_boundary(&line)) {
870 /* flush any leftover */
871 if (prev.len) {
872 handle_filter(&prev);
873 strbuf_reset(&prev);
874 }
875 if (!handle_boundary())
876 goto handle_body_out;
877 }
878
879 /* Unwrap transfer encoding */
880 decode_transfer_encoding(&line);
881
882 switch (transfer_encoding) {
883 case TE_BASE64:
884 case TE_QP:
885 {
886 struct strbuf **lines, **it, *sb;
887
888 /* Prepend any previous partial lines */
889 strbuf_insert(&line, 0, prev.buf, prev.len);
890 strbuf_reset(&prev);
891
892 /*
893 * This is a decoded line that may contain
894 * multiple new lines. Pass only one chunk
895 * at a time to handle_filter()
896 */
897 lines = strbuf_split(&line, '\n');
898 for (it = lines; (sb = *it); it++) {
899 if (*(it + 1) == NULL) /* The last line */
900 if (sb->buf[sb->len - 1] != '\n') {
901 /* Partial line, save it for later. */
902 strbuf_addbuf(&prev, sb);
903 break;
904 }
905 handle_filter(sb);
906 }
907 /*
908 * The partial chunk is saved in "prev" and will be
909 * appended by the next iteration of read_line_with_nul().
910 */
911 strbuf_list_free(lines);
912 break;
913 }
914 default:
915 handle_filter(&line);
916 }
917
918 } while (!strbuf_getwholeline(&line, fin, '\n'));
919
920handle_body_out:
921 strbuf_release(&prev);
922}
923
924static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
925{
926 const char *sp = data->buf;
927 while (1) {
928 char *ep = strchr(sp, '\n');
929 int len;
930 if (!ep)
931 len = strlen(sp);
932 else
933 len = ep - sp;
934 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
935 if (!ep)
936 break;
937 sp = ep + 1;
938 }
939}
940
941static void handle_info(void)
942{
943 struct strbuf *hdr;
944 int i;
945
946 for (i = 0; header[i]; i++) {
947 /* only print inbody headers if we output a patch file */
948 if (patch_lines && s_hdr_data[i])
949 hdr = s_hdr_data[i];
950 else if (p_hdr_data[i])
951 hdr = p_hdr_data[i];
952 else
953 continue;
954
955 if (!memcmp(header[i], "Subject", 7)) {
956 if (!keep_subject) {
957 cleanup_subject(hdr);
958 cleanup_space(hdr);
959 }
960 output_header_lines(fout, "Subject", hdr);
961 } else if (!memcmp(header[i], "From", 4)) {
962 cleanup_space(hdr);
963 handle_from(hdr);
964 fprintf(fout, "Author: %s\n", name.buf);
965 fprintf(fout, "Email: %s\n", email.buf);
966 } else {
967 cleanup_space(hdr);
968 fprintf(fout, "%s: %s\n", header[i], hdr->buf);
969 }
970 }
971 fprintf(fout, "\n");
972}
973
974static int mailinfo(FILE *in, FILE *out, const char *msg, const char *patch)
975{
976 int peek;
977 fin = in;
978 fout = out;
979
980 cmitmsg = fopen(msg, "w");
981 if (!cmitmsg) {
982 perror(msg);
983 return -1;
984 }
985 patchfile = fopen(patch, "w");
986 if (!patchfile) {
987 perror(patch);
988 fclose(cmitmsg);
989 return -1;
990 }
991
992 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));
993 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));
994
995 do {
996 peek = fgetc(in);
997 } while (isspace(peek));
998 ungetc(peek, in);
999
1000 /* process the email header */
1001 while (read_one_header_line(&line, fin))
1002 check_header(&line, p_hdr_data, 1);
1003
1004 handle_body();
1005 handle_info();
1006
1007 return 0;
1008}
1009
1010static int git_mailinfo_config(const char *var, const char *value, void *unused)
1011{
1012 if (prefixcmp(var, "mailinfo."))
1013 return git_default_config(var, value, unused);
1014 if (!strcmp(var, "mailinfo.scissors")) {
1015 use_scissors = git_config_bool(var, value);
1016 return 0;
1017 }
1018 /* perhaps others here */
1019 return 0;
1020}
1021
1022static const char mailinfo_usage[] =
1023 "git mailinfo [-k|-b] [-u | --encoding=<encoding> | -n] [--scissors | --no-scissors] msg patch < mail >info";
1024
1025int cmd_mailinfo(int argc, const char **argv, const char *prefix)
1026{
1027 const char *def_charset;
1028
1029 /* NEEDSWORK: might want to do the optional .git/ directory
1030 * discovery
1031 */
1032 git_config(git_mailinfo_config, NULL);
1033
1034 def_charset = get_commit_output_encoding();
1035 metainfo_charset = def_charset;
1036
1037 while (1 < argc && argv[1][0] == '-') {
1038 if (!strcmp(argv[1], "-k"))
1039 keep_subject = 1;
1040 else if (!strcmp(argv[1], "-b"))
1041 keep_non_patch_brackets_in_subject = 1;
1042 else if (!strcmp(argv[1], "-u"))
1043 metainfo_charset = def_charset;
1044 else if (!strcmp(argv[1], "-n"))
1045 metainfo_charset = NULL;
1046 else if (!prefixcmp(argv[1], "--encoding="))
1047 metainfo_charset = argv[1] + 11;
1048 else if (!strcmp(argv[1], "--scissors"))
1049 use_scissors = 1;
1050 else if (!strcmp(argv[1], "--no-scissors"))
1051 use_scissors = 0;
1052 else if (!strcmp(argv[1], "--no-inbody-headers"))
1053 use_inbody_headers = 0;
1054 else
1055 usage(mailinfo_usage);
1056 argc--; argv++;
1057 }
1058
1059 if (argc != 3)
1060 usage(mailinfo_usage);
1061
1062 return !!mailinfo(stdin, stdout, argv[1], argv[2]);
1063}