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#define MAX_BOUNDARIES 5
11
12struct mailinfo {
13 FILE *input;
14 FILE *output;
15 FILE *patchfile;
16
17 struct strbuf name;
18 struct strbuf email;
19 int keep_subject;
20 int keep_non_patch_brackets_in_subject;
21 int add_message_id;
22 int use_scissors;
23 int use_inbody_headers;
24 const char *metainfo_charset;
25
26 struct strbuf *content[MAX_BOUNDARIES];
27 struct strbuf **content_top;
28 struct strbuf charset;
29 char *message_id;
30 enum {
31 TE_DONTCARE, TE_QP, TE_BASE64
32 } transfer_encoding;
33 int patch_lines;
34 int filter_stage; /* still reading log or are we copying patch? */
35 int header_stage; /* still checking in-body headers? */
36 struct strbuf **p_hdr_data;
37 struct strbuf **s_hdr_data;
38
39 struct strbuf log_message;
40};
41
42static void cleanup_space(struct strbuf *sb)
43{
44 size_t pos, cnt;
45 for (pos = 0; pos < sb->len; pos++) {
46 if (isspace(sb->buf[pos])) {
47 sb->buf[pos] = ' ';
48 for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
49 strbuf_remove(sb, pos + 1, cnt);
50 }
51 }
52}
53
54static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
55{
56 struct strbuf *src = name;
57 if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
58 strchr(name->buf, '<') || strchr(name->buf, '>'))
59 src = email;
60 else if (name == out)
61 return;
62 strbuf_reset(out);
63 strbuf_addbuf(out, src);
64}
65
66static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
67{
68 /* John Doe <johndoe> */
69
70 char *bra, *ket;
71 /* This is fallback, so do not bother if we already have an
72 * e-mail address.
73 */
74 if (mi->email.len)
75 return;
76
77 bra = strchr(line->buf, '<');
78 if (!bra)
79 return;
80 ket = strchr(bra, '>');
81 if (!ket)
82 return;
83
84 strbuf_reset(&mi->email);
85 strbuf_add(&mi->email, bra + 1, ket - bra - 1);
86
87 strbuf_reset(&mi->name);
88 strbuf_add(&mi->name, line->buf, bra - line->buf);
89 strbuf_trim(&mi->name);
90 get_sane_name(&mi->name, &mi->name, &mi->email);
91}
92
93static void handle_from(struct mailinfo *mi, const struct strbuf *from)
94{
95 char *at;
96 size_t el;
97 struct strbuf f;
98
99 strbuf_init(&f, from->len);
100 strbuf_addbuf(&f, from);
101
102 at = strchr(f.buf, '@');
103 if (!at) {
104 parse_bogus_from(mi, from);
105 return;
106 }
107
108 /*
109 * If we already have one email, don't take any confusing lines
110 */
111 if (mi->email.len && strchr(at + 1, '@')) {
112 strbuf_release(&f);
113 return;
114 }
115
116 /* Pick up the string around '@', possibly delimited with <>
117 * pair; that is the email part.
118 */
119 while (at > f.buf) {
120 char c = at[-1];
121 if (isspace(c))
122 break;
123 if (c == '<') {
124 at[-1] = ' ';
125 break;
126 }
127 at--;
128 }
129 el = strcspn(at, " \n\t\r\v\f>");
130 strbuf_reset(&mi->email);
131 strbuf_add(&mi->email, at, el);
132 strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
133
134 /* The remainder is name. It could be
135 *
136 * - "John Doe <john.doe@xz>" (a), or
137 * - "john.doe@xz (John Doe)" (b), or
138 * - "John (zzz) Doe <john.doe@xz> (Comment)" (c)
139 *
140 * but we have removed the email part, so
141 *
142 * - remove extra spaces which could stay after email (case 'c'), and
143 * - trim from both ends, possibly removing the () pair at the end
144 * (cases 'a' and 'b').
145 */
146 cleanup_space(&f);
147 strbuf_trim(&f);
148 if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
149 strbuf_remove(&f, 0, 1);
150 strbuf_setlen(&f, f.len - 1);
151 }
152
153 get_sane_name(&mi->name, &f, &mi->email);
154 strbuf_release(&f);
155}
156
157static void handle_header(struct strbuf **out, const struct strbuf *line)
158{
159 if (!*out) {
160 *out = xmalloc(sizeof(struct strbuf));
161 strbuf_init(*out, line->len);
162 } else
163 strbuf_reset(*out);
164
165 strbuf_addbuf(*out, line);
166}
167
168/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
169 * to have enough heuristics to grok MIME encoded patches often found
170 * on our mailing lists. For example, we do not even treat header lines
171 * case insensitively.
172 */
173
174static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
175{
176 const char *ends, *ap = strcasestr(line, name);
177 size_t sz;
178
179 strbuf_setlen(attr, 0);
180 if (!ap)
181 return 0;
182 ap += strlen(name);
183 if (*ap == '"') {
184 ap++;
185 ends = "\"";
186 }
187 else
188 ends = "; \t";
189 sz = strcspn(ap, ends);
190 strbuf_add(attr, ap, sz);
191 return 1;
192}
193
194static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
195{
196 struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
197 strbuf_init(boundary, line->len);
198
199 if (slurp_attr(line->buf, "boundary=", boundary)) {
200 strbuf_insert(boundary, 0, "--", 2);
201 if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
202 fprintf(stderr, "Too many boundaries to handle\n");
203 exit(1);
204 }
205 *(mi->content_top) = boundary;
206 boundary = NULL;
207 }
208 slurp_attr(line->buf, "charset=", &mi->charset);
209
210 if (boundary) {
211 strbuf_release(boundary);
212 free(boundary);
213 }
214}
215
216static void handle_message_id(struct mailinfo *mi, const struct strbuf *line)
217{
218 if (mi->add_message_id)
219 mi->message_id = strdup(line->buf);
220}
221
222static void handle_content_transfer_encoding(struct mailinfo *mi,
223 const struct strbuf *line)
224{
225 if (strcasestr(line->buf, "base64"))
226 mi->transfer_encoding = TE_BASE64;
227 else if (strcasestr(line->buf, "quoted-printable"))
228 mi->transfer_encoding = TE_QP;
229 else
230 mi->transfer_encoding = TE_DONTCARE;
231}
232
233static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
234{
235 struct strbuf *content_top = *(mi->content_top);
236
237 return ((content_top->len <= line->len) &&
238 !memcmp(line->buf, content_top->buf, content_top->len));
239}
240
241static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
242{
243 size_t at = 0;
244
245 while (at < subject->len) {
246 char *pos;
247 size_t remove;
248
249 switch (subject->buf[at]) {
250 case 'r': case 'R':
251 if (subject->len <= at + 3)
252 break;
253 if ((subject->buf[at + 1] == 'e' ||
254 subject->buf[at + 1] == 'E') &&
255 subject->buf[at + 2] == ':') {
256 strbuf_remove(subject, at, 3);
257 continue;
258 }
259 at++;
260 break;
261 case ' ': case '\t': case ':':
262 strbuf_remove(subject, at, 1);
263 continue;
264 case '[':
265 pos = strchr(subject->buf + at, ']');
266 if (!pos)
267 break;
268 remove = pos - subject->buf + at + 1;
269 if (!mi->keep_non_patch_brackets_in_subject ||
270 (7 <= remove &&
271 memmem(subject->buf + at, remove, "PATCH", 5)))
272 strbuf_remove(subject, at, remove);
273 else {
274 at += remove;
275 /*
276 * If the input had a space after the ], keep
277 * it. We don't bother with finding the end of
278 * the space, since we later normalize it
279 * anyway.
280 */
281 if (isspace(subject->buf[at]))
282 at += 1;
283 }
284 continue;
285 }
286 break;
287 }
288 strbuf_trim(subject);
289}
290
291#define MAX_HDR_PARSED 10
292static const char *header[MAX_HDR_PARSED] = {
293 "From","Subject","Date",
294};
295
296static inline int cmp_header(const struct strbuf *line, const char *hdr)
297{
298 int len = strlen(hdr);
299 return !strncasecmp(line->buf, hdr, len) && line->len > len &&
300 line->buf[len] == ':' && isspace(line->buf[len + 1]);
301}
302
303static int is_format_patch_separator(const char *line, int len)
304{
305 static const char SAMPLE[] =
306 "From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
307 const char *cp;
308
309 if (len != strlen(SAMPLE))
310 return 0;
311 if (!skip_prefix(line, "From ", &cp))
312 return 0;
313 if (strspn(cp, "0123456789abcdef") != 40)
314 return 0;
315 cp += 40;
316 return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
317}
318
319static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
320{
321 const char *in = q_seg->buf;
322 int c;
323 struct strbuf *out = xmalloc(sizeof(struct strbuf));
324 strbuf_init(out, q_seg->len);
325
326 while ((c = *in++) != 0) {
327 if (c == '=') {
328 int d = *in++;
329 if (d == '\n' || !d)
330 break; /* drop trailing newline */
331 strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));
332 continue;
333 }
334 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
335 c = 0x20;
336 strbuf_addch(out, c);
337 }
338 return out;
339}
340
341static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
342{
343 /* Decode in..ep, possibly in-place to ot */
344 int c, pos = 0, acc = 0;
345 const char *in = b_seg->buf;
346 struct strbuf *out = xmalloc(sizeof(struct strbuf));
347 strbuf_init(out, b_seg->len);
348
349 while ((c = *in++) != 0) {
350 if (c == '+')
351 c = 62;
352 else if (c == '/')
353 c = 63;
354 else if ('A' <= c && c <= 'Z')
355 c -= 'A';
356 else if ('a' <= c && c <= 'z')
357 c -= 'a' - 26;
358 else if ('0' <= c && c <= '9')
359 c -= '0' - 52;
360 else
361 continue; /* garbage */
362 switch (pos++) {
363 case 0:
364 acc = (c << 2);
365 break;
366 case 1:
367 strbuf_addch(out, (acc | (c >> 4)));
368 acc = (c & 15) << 4;
369 break;
370 case 2:
371 strbuf_addch(out, (acc | (c >> 2)));
372 acc = (c & 3) << 6;
373 break;
374 case 3:
375 strbuf_addch(out, (acc | c));
376 acc = pos = 0;
377 break;
378 }
379 }
380 return out;
381}
382
383static void convert_to_utf8(struct mailinfo *mi,
384 struct strbuf *line, const char *charset)
385{
386 char *out;
387
388 if (!mi->metainfo_charset || !charset || !*charset)
389 return;
390
391 if (same_encoding(mi->metainfo_charset, charset))
392 return;
393 out = reencode_string(line->buf, mi->metainfo_charset, charset);
394 if (!out)
395 die("cannot convert from %s to %s",
396 charset, mi->metainfo_charset);
397 strbuf_attach(line, out, strlen(out), strlen(out));
398}
399
400static void decode_header(struct mailinfo *mi, struct strbuf *it)
401{
402 char *in, *ep, *cp;
403 struct strbuf outbuf = STRBUF_INIT, *dec;
404 struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
405
406 in = it->buf;
407 while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
408 int encoding;
409 strbuf_reset(&charset_q);
410 strbuf_reset(&piecebuf);
411
412 if (in != ep) {
413 /*
414 * We are about to process an encoded-word
415 * that begins at ep, but there is something
416 * before the encoded word.
417 */
418 char *scan;
419 for (scan = in; scan < ep; scan++)
420 if (!isspace(*scan))
421 break;
422
423 if (scan != ep || in == it->buf) {
424 /*
425 * We should not lose that "something",
426 * unless we have just processed an
427 * encoded-word, and there is only LWS
428 * before the one we are about to process.
429 */
430 strbuf_add(&outbuf, in, ep - in);
431 }
432 }
433 /* E.g.
434 * ep : "=?iso-2022-jp?B?GyR...?= foo"
435 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
436 */
437 ep += 2;
438
439 if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
440 goto release_return;
441
442 if (cp + 3 - it->buf > it->len)
443 goto release_return;
444 strbuf_add(&charset_q, ep, cp - ep);
445
446 encoding = cp[1];
447 if (!encoding || cp[2] != '?')
448 goto release_return;
449 ep = strstr(cp + 3, "?=");
450 if (!ep)
451 goto release_return;
452 strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
453 switch (tolower(encoding)) {
454 default:
455 goto release_return;
456 case 'b':
457 dec = decode_b_segment(&piecebuf);
458 break;
459 case 'q':
460 dec = decode_q_segment(&piecebuf, 1);
461 break;
462 }
463 convert_to_utf8(mi, dec, charset_q.buf);
464
465 strbuf_addbuf(&outbuf, dec);
466 strbuf_release(dec);
467 free(dec);
468 in = ep + 2;
469 }
470 strbuf_addstr(&outbuf, in);
471 strbuf_reset(it);
472 strbuf_addbuf(it, &outbuf);
473release_return:
474 strbuf_release(&outbuf);
475 strbuf_release(&charset_q);
476 strbuf_release(&piecebuf);
477}
478
479static int check_header(struct mailinfo *mi,
480 const struct strbuf *line,
481 struct strbuf *hdr_data[], int overwrite)
482{
483 int i, ret = 0, len;
484 struct strbuf sb = STRBUF_INIT;
485
486 /* search for the interesting parts */
487 for (i = 0; header[i]; i++) {
488 int len = strlen(header[i]);
489 if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
490 /* Unwrap inline B and Q encoding, and optionally
491 * normalize the meta information to utf8.
492 */
493 strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
494 decode_header(mi, &sb);
495 handle_header(&hdr_data[i], &sb);
496 ret = 1;
497 goto check_header_out;
498 }
499 }
500
501 /* Content stuff */
502 if (cmp_header(line, "Content-Type")) {
503 len = strlen("Content-Type: ");
504 strbuf_add(&sb, line->buf + len, line->len - len);
505 decode_header(mi, &sb);
506 strbuf_insert(&sb, 0, "Content-Type: ", len);
507 handle_content_type(mi, &sb);
508 ret = 1;
509 goto check_header_out;
510 }
511 if (cmp_header(line, "Content-Transfer-Encoding")) {
512 len = strlen("Content-Transfer-Encoding: ");
513 strbuf_add(&sb, line->buf + len, line->len - len);
514 decode_header(mi, &sb);
515 handle_content_transfer_encoding(mi, &sb);
516 ret = 1;
517 goto check_header_out;
518 }
519 if (cmp_header(line, "Message-Id")) {
520 len = strlen("Message-Id: ");
521 strbuf_add(&sb, line->buf + len, line->len - len);
522 decode_header(mi, &sb);
523 handle_message_id(mi, &sb);
524 ret = 1;
525 goto check_header_out;
526 }
527
528 /* for inbody stuff */
529 if (starts_with(line->buf, ">From") && isspace(line->buf[5])) {
530 ret = is_format_patch_separator(line->buf + 1, line->len - 1);
531 goto check_header_out;
532 }
533 if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
534 for (i = 0; header[i]; i++) {
535 if (!strcmp("Subject", header[i])) {
536 handle_header(&hdr_data[i], line);
537 ret = 1;
538 goto check_header_out;
539 }
540 }
541 }
542
543check_header_out:
544 strbuf_release(&sb);
545 return ret;
546}
547
548static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
549{
550 struct strbuf *ret;
551
552 switch (mi->transfer_encoding) {
553 case TE_QP:
554 ret = decode_q_segment(line, 0);
555 break;
556 case TE_BASE64:
557 ret = decode_b_segment(line);
558 break;
559 case TE_DONTCARE:
560 default:
561 return;
562 }
563 strbuf_reset(line);
564 strbuf_addbuf(line, ret);
565 strbuf_release(ret);
566 free(ret);
567}
568
569static inline int patchbreak(const struct strbuf *line)
570{
571 size_t i;
572
573 /* Beginning of a "diff -" header? */
574 if (starts_with(line->buf, "diff -"))
575 return 1;
576
577 /* CVS "Index: " line? */
578 if (starts_with(line->buf, "Index: "))
579 return 1;
580
581 /*
582 * "--- <filename>" starts patches without headers
583 * "---<sp>*" is a manual separator
584 */
585 if (line->len < 4)
586 return 0;
587
588 if (starts_with(line->buf, "---")) {
589 /* space followed by a filename? */
590 if (line->buf[3] == ' ' && !isspace(line->buf[4]))
591 return 1;
592 /* Just whitespace? */
593 for (i = 3; i < line->len; i++) {
594 unsigned char c = line->buf[i];
595 if (c == '\n')
596 return 1;
597 if (!isspace(c))
598 break;
599 }
600 return 0;
601 }
602 return 0;
603}
604
605static int is_scissors_line(const struct strbuf *line)
606{
607 size_t i, len = line->len;
608 int scissors = 0, gap = 0;
609 int first_nonblank = -1;
610 int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;
611 const char *buf = line->buf;
612
613 for (i = 0; i < len; i++) {
614 if (isspace(buf[i])) {
615 if (in_perforation) {
616 perforation++;
617 gap++;
618 }
619 continue;
620 }
621 last_nonblank = i;
622 if (first_nonblank < 0)
623 first_nonblank = i;
624 if (buf[i] == '-') {
625 in_perforation = 1;
626 perforation++;
627 continue;
628 }
629 if (i + 1 < len &&
630 (!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2) ||
631 !memcmp(buf + i, ">%", 2) || !memcmp(buf + i, "%<", 2))) {
632 in_perforation = 1;
633 perforation += 2;
634 scissors += 2;
635 i++;
636 continue;
637 }
638 in_perforation = 0;
639 }
640
641 /*
642 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
643 * Even though there can be arbitrary cruft on the same line
644 * (e.g. "cut here"), in order to avoid misidentification, the
645 * perforation must occupy more than a third of the visible
646 * width of the line, and dashes and scissors must occupy more
647 * than half of the perforation.
648 */
649
650 visible = last_nonblank - first_nonblank + 1;
651 return (scissors && 8 <= visible &&
652 visible < perforation * 3 &&
653 gap * 2 < perforation);
654}
655
656static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
657{
658 assert(!mi->filter_stage);
659
660 if (mi->header_stage) {
661 if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
662 return 0;
663 }
664
665 if (mi->use_inbody_headers && mi->header_stage) {
666 mi->header_stage = check_header(mi, line, mi->s_hdr_data, 0);
667 if (mi->header_stage)
668 return 0;
669 } else
670 /* Only trim the first (blank) line of the commit message
671 * when ignoring in-body headers.
672 */
673 mi->header_stage = 0;
674
675 /* normalize the log message to UTF-8. */
676 convert_to_utf8(mi, line, mi->charset.buf);
677
678 if (mi->use_scissors && is_scissors_line(line)) {
679 int i;
680
681 strbuf_setlen(&mi->log_message, 0);
682 mi->header_stage = 1;
683
684 /*
685 * We may have already read "secondary headers"; purge
686 * them to give ourselves a clean restart.
687 */
688 for (i = 0; header[i]; i++) {
689 if (mi->s_hdr_data[i])
690 strbuf_release(mi->s_hdr_data[i]);
691 mi->s_hdr_data[i] = NULL;
692 }
693 return 0;
694 }
695
696 if (patchbreak(line)) {
697 if (mi->message_id)
698 strbuf_addf(&mi->log_message,
699 "Message-Id: %s\n", mi->message_id);
700 return 1;
701 }
702
703 strbuf_addbuf(&mi->log_message, line);
704 return 0;
705}
706
707static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
708{
709 fwrite(line->buf, 1, line->len, mi->patchfile);
710 mi->patch_lines++;
711}
712
713static void handle_filter(struct mailinfo *mi, struct strbuf *line)
714{
715 switch (mi->filter_stage) {
716 case 0:
717 if (!handle_commit_msg(mi, line))
718 break;
719 mi->filter_stage++;
720 case 1:
721 handle_patch(mi, line);
722 break;
723 }
724}
725
726static int is_rfc2822_header(const struct strbuf *line)
727{
728 /*
729 * The section that defines the loosest possible
730 * field name is "3.6.8 Optional fields".
731 *
732 * optional-field = field-name ":" unstructured CRLF
733 * field-name = 1*ftext
734 * ftext = %d33-57 / %59-126
735 */
736 int ch;
737 char *cp = line->buf;
738
739 /* Count mbox From headers as headers */
740 if (starts_with(cp, "From ") || starts_with(cp, ">From "))
741 return 1;
742
743 while ((ch = *cp++)) {
744 if (ch == ':')
745 return 1;
746 if ((33 <= ch && ch <= 57) ||
747 (59 <= ch && ch <= 126))
748 continue;
749 break;
750 }
751 return 0;
752}
753
754static int read_one_header_line(struct strbuf *line, FILE *in)
755{
756 struct strbuf continuation = STRBUF_INIT;
757
758 /* Get the first part of the line. */
759 if (strbuf_getline(line, in, '\n'))
760 return 0;
761
762 /*
763 * Is it an empty line or not a valid rfc2822 header?
764 * If so, stop here, and return false ("not a header")
765 */
766 strbuf_rtrim(line);
767 if (!line->len || !is_rfc2822_header(line)) {
768 /* Re-add the newline */
769 strbuf_addch(line, '\n');
770 return 0;
771 }
772
773 /*
774 * Now we need to eat all the continuation lines..
775 * Yuck, 2822 header "folding"
776 */
777 for (;;) {
778 int peek;
779
780 peek = fgetc(in); ungetc(peek, in);
781 if (peek != ' ' && peek != '\t')
782 break;
783 if (strbuf_getline(&continuation, in, '\n'))
784 break;
785 continuation.buf[0] = ' ';
786 strbuf_rtrim(&continuation);
787 strbuf_addbuf(line, &continuation);
788 }
789 strbuf_release(&continuation);
790
791 return 1;
792}
793
794static int find_boundary(struct mailinfo *mi, struct strbuf *line)
795{
796 while (!strbuf_getline(line, mi->input, '\n')) {
797 if (*(mi->content_top) && is_multipart_boundary(mi, line))
798 return 1;
799 }
800 return 0;
801}
802
803static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
804{
805 struct strbuf newline = STRBUF_INIT;
806
807 strbuf_addch(&newline, '\n');
808again:
809 if (line->len >= (*(mi->content_top))->len + 2 &&
810 !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
811 /* we hit an end boundary */
812 /* pop the current boundary off the stack */
813 strbuf_release(*(mi->content_top));
814 free(*(mi->content_top));
815 *(mi->content_top) = NULL;
816
817 /* technically won't happen as is_multipart_boundary()
818 will fail first. But just in case..
819 */
820 if (--mi->content_top < mi->content) {
821 fprintf(stderr, "Detected mismatched boundaries, "
822 "can't recover\n");
823 exit(1);
824 }
825 handle_filter(mi, &newline);
826 strbuf_release(&newline);
827
828 /* skip to the next boundary */
829 if (!find_boundary(mi, line))
830 return 0;
831 goto again;
832 }
833
834 /* set some defaults */
835 mi->transfer_encoding = TE_DONTCARE;
836 strbuf_reset(&mi->charset);
837
838 /* slurp in this section's info */
839 while (read_one_header_line(line, mi->input))
840 check_header(mi, line, mi->p_hdr_data, 0);
841
842 strbuf_release(&newline);
843 /* replenish line */
844 if (strbuf_getline(line, mi->input, '\n'))
845 return 0;
846 strbuf_addch(line, '\n');
847 return 1;
848}
849
850static void handle_body(struct mailinfo *mi, struct strbuf *line)
851{
852 struct strbuf prev = STRBUF_INIT;
853
854 /* Skip up to the first boundary */
855 if (*(mi->content_top)) {
856 if (!find_boundary(mi, line))
857 goto handle_body_out;
858 }
859
860 do {
861 /* process any boundary lines */
862 if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
863 /* flush any leftover */
864 if (prev.len) {
865 handle_filter(mi, &prev);
866 strbuf_reset(&prev);
867 }
868 if (!handle_boundary(mi, line))
869 goto handle_body_out;
870 }
871
872 /* Unwrap transfer encoding */
873 decode_transfer_encoding(mi, line);
874
875 switch (mi->transfer_encoding) {
876 case TE_BASE64:
877 case TE_QP:
878 {
879 struct strbuf **lines, **it, *sb;
880
881 /* Prepend any previous partial lines */
882 strbuf_insert(line, 0, prev.buf, prev.len);
883 strbuf_reset(&prev);
884
885 /*
886 * This is a decoded line that may contain
887 * multiple new lines. Pass only one chunk
888 * at a time to handle_filter()
889 */
890 lines = strbuf_split(line, '\n');
891 for (it = lines; (sb = *it); it++) {
892 if (*(it + 1) == NULL) /* The last line */
893 if (sb->buf[sb->len - 1] != '\n') {
894 /* Partial line, save it for later. */
895 strbuf_addbuf(&prev, sb);
896 break;
897 }
898 handle_filter(mi, sb);
899 }
900 /*
901 * The partial chunk is saved in "prev" and will be
902 * appended by the next iteration of read_line_with_nul().
903 */
904 strbuf_list_free(lines);
905 break;
906 }
907 default:
908 handle_filter(mi, line);
909 }
910
911 } while (!strbuf_getwholeline(line, mi->input, '\n'));
912
913handle_body_out:
914 strbuf_release(&prev);
915}
916
917static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
918{
919 const char *sp = data->buf;
920 while (1) {
921 char *ep = strchr(sp, '\n');
922 int len;
923 if (!ep)
924 len = strlen(sp);
925 else
926 len = ep - sp;
927 fprintf(fout, "%s: %.*s\n", hdr, len, sp);
928 if (!ep)
929 break;
930 sp = ep + 1;
931 }
932}
933
934static void handle_info(struct mailinfo *mi)
935{
936 struct strbuf *hdr;
937 int i;
938
939 for (i = 0; header[i]; i++) {
940 /* only print inbody headers if we output a patch file */
941 if (mi->patch_lines && mi->s_hdr_data[i])
942 hdr = mi->s_hdr_data[i];
943 else if (mi->p_hdr_data[i])
944 hdr = mi->p_hdr_data[i];
945 else
946 continue;
947
948 if (!strcmp(header[i], "Subject")) {
949 if (!mi->keep_subject) {
950 cleanup_subject(mi, hdr);
951 cleanup_space(hdr);
952 }
953 output_header_lines(mi->output, "Subject", hdr);
954 } else if (!strcmp(header[i], "From")) {
955 cleanup_space(hdr);
956 handle_from(mi, hdr);
957 fprintf(mi->output, "Author: %s\n", mi->name.buf);
958 fprintf(mi->output, "Email: %s\n", mi->email.buf);
959 } else {
960 cleanup_space(hdr);
961 fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
962 }
963 }
964 fprintf(mi->output, "\n");
965}
966
967static int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
968{
969 FILE *cmitmsg;
970 int peek;
971 struct strbuf line = STRBUF_INIT;
972
973 cmitmsg = fopen(msg, "w");
974 if (!cmitmsg) {
975 perror(msg);
976 return -1;
977 }
978 mi->patchfile = fopen(patch, "w");
979 if (!mi->patchfile) {
980 perror(patch);
981 fclose(cmitmsg);
982 return -1;
983 }
984
985 mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
986 mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
987
988 do {
989 peek = fgetc(mi->input);
990 } while (isspace(peek));
991 ungetc(peek, mi->input);
992
993 /* process the email header */
994 while (read_one_header_line(&line, mi->input))
995 check_header(mi, &line, mi->p_hdr_data, 1);
996
997 handle_body(mi, &line);
998 fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
999 fclose(cmitmsg);
1000 fclose(mi->patchfile);
1001
1002 handle_info(mi);
1003 strbuf_release(&line);
1004 return 0;
1005}
1006
1007static int git_mailinfo_config(const char *var, const char *value, void *mi_)
1008{
1009 struct mailinfo *mi = mi_;
1010
1011 if (!starts_with(var, "mailinfo."))
1012 return git_default_config(var, value, NULL);
1013 if (!strcmp(var, "mailinfo.scissors")) {
1014 mi->use_scissors = git_config_bool(var, value);
1015 return 0;
1016 }
1017 /* perhaps others here */
1018 return 0;
1019}
1020
1021static void setup_mailinfo(struct mailinfo *mi)
1022{
1023 memset(mi, 0, sizeof(*mi));
1024 strbuf_init(&mi->name, 0);
1025 strbuf_init(&mi->email, 0);
1026 strbuf_init(&mi->charset, 0);
1027 strbuf_init(&mi->log_message, 0);
1028 mi->header_stage = 1;
1029 mi->use_inbody_headers = 1;
1030 mi->content_top = mi->content;
1031 git_config(git_mailinfo_config, &mi);
1032}
1033
1034static void clear_mailinfo(struct mailinfo *mi)
1035{
1036 int i;
1037
1038 strbuf_release(&mi->name);
1039 strbuf_release(&mi->email);
1040 strbuf_release(&mi->charset);
1041 free(mi->message_id);
1042
1043 for (i = 0; mi->p_hdr_data[i]; i++)
1044 strbuf_release(mi->p_hdr_data[i]);
1045 free(mi->p_hdr_data);
1046 for (i = 0; mi->s_hdr_data[i]; i++)
1047 strbuf_release(mi->s_hdr_data[i]);
1048 free(mi->s_hdr_data);
1049
1050 while (mi->content < mi->content_top) {
1051 free(*(mi->content_top));
1052 mi->content_top--;
1053 }
1054
1055 strbuf_release(&mi->log_message);
1056}
1057
1058static const char mailinfo_usage[] =
1059 "git mailinfo [-k | -b] [-m | --message-id] [-u | --encoding=<encoding> | -n] [--scissors | --no-scissors] <msg> <patch> < mail >info";
1060
1061int cmd_mailinfo(int argc, const char **argv, const char *prefix)
1062{
1063 const char *def_charset;
1064 struct mailinfo mi;
1065 int status;
1066
1067 /* NEEDSWORK: might want to do the optional .git/ directory
1068 * discovery
1069 */
1070 setup_mailinfo(&mi);
1071
1072 def_charset = get_commit_output_encoding();
1073 mi.metainfo_charset = def_charset;
1074
1075 while (1 < argc && argv[1][0] == '-') {
1076 if (!strcmp(argv[1], "-k"))
1077 mi.keep_subject = 1;
1078 else if (!strcmp(argv[1], "-b"))
1079 mi.keep_non_patch_brackets_in_subject = 1;
1080 else if (!strcmp(argv[1], "-m") || !strcmp(argv[1], "--message-id"))
1081 mi.add_message_id = 1;
1082 else if (!strcmp(argv[1], "-u"))
1083 mi.metainfo_charset = def_charset;
1084 else if (!strcmp(argv[1], "-n"))
1085 mi.metainfo_charset = NULL;
1086 else if (starts_with(argv[1], "--encoding="))
1087 mi.metainfo_charset = argv[1] + 11;
1088 else if (!strcmp(argv[1], "--scissors"))
1089 mi.use_scissors = 1;
1090 else if (!strcmp(argv[1], "--no-scissors"))
1091 mi.use_scissors = 0;
1092 else if (!strcmp(argv[1], "--no-inbody-headers"))
1093 mi.use_inbody_headers = 0;
1094 else
1095 usage(mailinfo_usage);
1096 argc--; argv++;
1097 }
1098
1099 if (argc != 3)
1100 usage(mailinfo_usage);
1101
1102 mi.input = stdin;
1103 mi.output = stdout;
1104 status = !!mailinfo(&mi, argv[1], argv[2]);
1105 clear_mailinfo(&mi);
1106
1107 return status;
1108}