Provide git_config with a callback-data parameter
[git/git.git] / builtin-mailinfo.c
CommitLineData
2744b234
LT
1/*
2 * Another stupid program, this one parsing the headers of an
3 * email to figure out authorship and subject
4 */
f1f909e3 5#include "cache.h"
34488e3c 6#include "builtin.h"
b45974a6 7#include "utf8.h"
2744b234 8
34488e3c 9static FILE *cmitmsg, *patchfile, *fin, *fout;
2744b234 10
96f1e58f
DR
11static int keep_subject;
12static const char *metainfo_charset;
2744b234
LT
13static char line[1000];
14static char name[1000];
15static char email[1000];
2744b234 16
d4a9ce78
JH
17static enum {
18 TE_DONTCARE, TE_QP, TE_BASE64,
19} transfer_encoding;
87ab7992
DZ
20static enum {
21 TYPE_TEXT, TYPE_OTHER,
22} message_type;
d4a9ce78 23
87ab7992 24static char charset[256];
96f1e58f 25static int patch_lines;
87ab7992
DZ
26static char **p_hdr_data, **s_hdr_data;
27
28#define MAX_HDR_PARSED 10
29#define MAX_BOUNDARIES 5
d4a9ce78 30
2744b234
LT
31static char *sanity_check(char *name, char *email)
32{
33 int len = strlen(name);
34 if (len < 3 || len > 60)
35 return email;
36 if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
37 return email;
38 return name;
39}
40
e0e3ba20
JH
41static int bogus_from(char *line)
42{
43 /* John Doe <johndoe> */
44 char *bra, *ket, *dst, *cp;
45
46 /* This is fallback, so do not bother if we already have an
47 * e-mail address.
34488e3c 48 */
e0e3ba20
JH
49 if (*email)
50 return 0;
51
52 bra = strchr(line, '<');
53 if (!bra)
54 return 0;
55 ket = strchr(bra, '>');
56 if (!ket)
57 return 0;
58
59 for (dst = email, cp = bra+1; cp < ket; )
60 *dst++ = *cp++;
61 *dst = 0;
62 for (cp = line; isspace(*cp); cp++)
63 ;
64 for (bra--; isspace(*bra); bra--)
65 *bra = 0;
66 cp = sanity_check(cp, email);
67 strcpy(name, cp);
68 return 1;
69}
70
2dec02b1 71static int handle_from(char *in_line)
2744b234 72{
2dec02b1
EB
73 char line[1000];
74 char *at;
2744b234
LT
75 char *dst;
76
2dec02b1
EB
77 strcpy(line, in_line);
78 at = strchr(line, '@');
2744b234 79 if (!at)
e0e3ba20 80 return bogus_from(line);
2744b234
LT
81
82 /*
83 * If we already have one email, don't take any confusing lines
84 */
85 if (*email && strchr(at+1, '@'))
86 return 0;
87
d4a9ce78
JH
88 /* Pick up the string around '@', possibly delimited with <>
89 * pair; that is the email part. White them out while copying.
90 */
2744b234
LT
91 while (at > line) {
92 char c = at[-1];
d4a9ce78
JH
93 if (isspace(c))
94 break;
95 if (c == '<') {
96 at[-1] = ' ';
2744b234 97 break;
d4a9ce78 98 }
2744b234
LT
99 at--;
100 }
101 dst = email;
102 for (;;) {
103 unsigned char c = *at;
d4a9ce78
JH
104 if (!c || c == '>' || isspace(c)) {
105 if (c == '>')
106 *at = ' ';
2744b234 107 break;
d4a9ce78 108 }
2744b234
LT
109 *at++ = ' ';
110 *dst++ = c;
111 }
112 *dst++ = 0;
113
d4a9ce78
JH
114 /* The remainder is name. It could be "John Doe <john.doe@xz>"
115 * or "john.doe@xz (John Doe)", but we have whited out the
116 * email part, so trim from both ends, possibly removing
117 * the () pair at the end.
118 */
2744b234
LT
119 at = line + strlen(line);
120 while (at > line) {
121 unsigned char c = *--at;
d4a9ce78
JH
122 if (!isspace(c)) {
123 at[(c == ')') ? 0 : 1] = 0;
2744b234 124 break;
d4a9ce78 125 }
2744b234
LT
126 }
127
128 at = line;
129 for (;;) {
130 unsigned char c = *at;
d4a9ce78
JH
131 if (!c || !isspace(c)) {
132 if (c == '(')
133 at++;
2744b234 134 break;
d4a9ce78 135 }
2744b234
LT
136 at++;
137 }
2744b234 138 at = sanity_check(at, email);
2744b234
LT
139 strcpy(name, at);
140 return 1;
141}
142
87ab7992 143static int handle_header(char *line, char *data, int ofs)
62c1f6b4 144{
87ab7992
DZ
145 if (!line || !data)
146 return 1;
147
148 strcpy(data, line+ofs);
62c1f6b4 149
d4a9ce78
JH
150 return 0;
151}
152
153/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
154 * to have enough heuristics to grok MIME encoded patches often found
155 * on our mailing lists. For example, we do not even treat header lines
156 * case insensitively.
157 */
158
159static int slurp_attr(const char *line, const char *name, char *attr)
160{
554fe20d 161 const char *ends, *ap = strcasestr(line, name);
d4a9ce78
JH
162 size_t sz;
163
164 if (!ap) {
165 *attr = 0;
166 return 0;
167 }
168 ap += strlen(name);
169 if (*ap == '"') {
170 ap++;
171 ends = "\"";
172 }
173 else
174 ends = "; \t";
175 sz = strcspn(ap, ends);
176 memcpy(attr, ap, sz);
177 attr[sz] = 0;
178 return 1;
179}
180
87ab7992
DZ
181struct content_type {
182 char *boundary;
183 int boundary_len;
184};
185
186static struct content_type content[MAX_BOUNDARIES];
187
188static struct content_type *content_top = content;
189
190static int handle_content_type(char *line)
d4a9ce78 191{
87ab7992
DZ
192 char boundary[256];
193
194 if (strcasestr(line, "text/") == NULL)
195 message_type = TYPE_OTHER;
196 if (slurp_attr(line, "boundary=", boundary + 2)) {
197 memcpy(boundary, "--", 2);
198 if (content_top++ >= &content[MAX_BOUNDARIES]) {
199 fprintf(stderr, "Too many boundaries to handle\n");
200 exit(1);
201 }
202 content_top->boundary_len = strlen(boundary);
203 content_top->boundary = xmalloc(content_top->boundary_len+1);
204 strcpy(content_top->boundary, boundary);
b893f091 205 }
87ab7992 206 if (slurp_attr(line, "charset=", charset)) {
d4a9ce78
JH
207 int i, c;
208 for (i = 0; (c = charset[i]) != 0; i++)
209 charset[i] = tolower(c);
210 }
211 return 0;
212}
213
d4a9ce78
JH
214static int handle_content_transfer_encoding(char *line)
215{
216 if (strcasestr(line, "base64"))
217 transfer_encoding = TE_BASE64;
218 else if (strcasestr(line, "quoted-printable"))
219 transfer_encoding = TE_QP;
220 else
221 transfer_encoding = TE_DONTCARE;
222 return 0;
2744b234
LT
223}
224
d4a9ce78
JH
225static int is_multipart_boundary(const char *line)
226{
87ab7992 227 return (!memcmp(line, content_top->boundary, content_top->boundary_len));
d4a9ce78
JH
228}
229
230static int eatspace(char *line)
2744b234 231{
d4a9ce78
JH
232 int len = strlen(line);
233 while (len > 0 && isspace(line[len-1]))
234 line[--len] = 0;
235 return len;
2744b234
LT
236}
237
d4a9ce78 238static char *cleanup_subject(char *subject)
2744b234
LT
239{
240 for (;;) {
241 char *p;
242 int len, remove;
243 switch (*subject) {
244 case 'r': case 'R':
245 if (!memcmp("e:", subject+1, 2)) {
87ab7992 246 subject += 3;
2744b234
LT
247 continue;
248 }
249 break;
250 case ' ': case '\t': case ':':
251 subject++;
252 continue;
253
254 case '[':
255 p = strchr(subject, ']');
256 if (!p) {
257 subject++;
258 continue;
259 }
260 len = strlen(p);
261 remove = p - subject;
262 if (remove <= len *2) {
263 subject = p+1;
264 continue;
34488e3c 265 }
2744b234
LT
266 break;
267 }
ae448e38 268 eatspace(subject);
2744b234
LT
269 return subject;
270 }
34488e3c 271}
2744b234
LT
272
273static void cleanup_space(char *buf)
274{
275 unsigned char c;
276 while ((c = *buf) != 0) {
277 buf++;
278 if (isspace(c)) {
279 buf[-1] = ' ';
280 c = *buf;
281 while (isspace(c)) {
282 int len = strlen(buf);
283 memmove(buf, buf+1, len);
284 c = *buf;
285 }
286 }
287 }
288}
289
8dabdfcc 290static void decode_header(char *it, unsigned itsize);
538dfe73 291static const char *header[MAX_HDR_PARSED] = {
87ab7992 292 "From","Subject","Date",
d4a9ce78
JH
293};
294
8dabdfcc 295static int check_header(char *line, unsigned linesize, char **hdr_data, int overwrite)
d4a9ce78
JH
296{
297 int i;
298
87ab7992
DZ
299 /* search for the interesting parts */
300 for (i = 0; header[i]; i++) {
301 int len = strlen(header[i]);
86747c13 302 if ((!hdr_data[i] || overwrite) &&
87ab7992 303 !strncasecmp(line, header[i], len) &&
d4a9ce78 304 line[len] == ':' && isspace(line[len + 1])) {
33504530
EB
305 /* Unwrap inline B and Q encoding, and optionally
306 * normalize the meta information to utf8.
307 */
8dabdfcc 308 decode_header(line + len + 2, linesize - len - 2);
87ab7992
DZ
309 hdr_data[i] = xmalloc(1000 * sizeof(char));
310 if (! handle_header(line, hdr_data[i], len + 2)) {
311 return 1;
312 }
d4a9ce78
JH
313 }
314 }
d4a9ce78 315
87ab7992
DZ
316 /* Content stuff */
317 if (!strncasecmp(line, "Content-Type", 12) &&
318 line[12] == ':' && isspace(line[12 + 1])) {
8dabdfcc 319 decode_header(line + 12 + 2, linesize - 12 - 2);
87ab7992
DZ
320 if (! handle_content_type(line)) {
321 return 1;
322 }
323 }
324 if (!strncasecmp(line, "Content-Transfer-Encoding", 25) &&
325 line[25] == ':' && isspace(line[25 + 1])) {
8dabdfcc 326 decode_header(line + 25 + 2, linesize - 25 - 2);
87ab7992
DZ
327 if (! handle_content_transfer_encoding(line)) {
328 return 1;
329 }
330 }
331
332 /* for inbody stuff */
333 if (!memcmp(">From", line, 5) && isspace(line[5]))
334 return 1;
335 if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
336 for (i = 0; header[i]; i++) {
337 if (!memcmp("Subject: ", header[i], 9)) {
338 if (! handle_header(line, hdr_data[i], 0)) {
339 return 1;
340 }
341 }
342 }
343 }
344
345 /* no match */
346 return 0;
d4a9ce78
JH
347}
348
ef29c117
JH
349static int is_rfc2822_header(char *line)
350{
351 /*
352 * The section that defines the loosest possible
353 * field name is "3.6.8 Optional fields".
354 *
355 * optional-field = field-name ":" unstructured CRLF
356 * field-name = 1*ftext
357 * ftext = %d33-57 / %59-126
358 */
359 int ch;
360 char *cp = line;
34fc5cef
LT
361
362 /* Count mbox From headers as headers */
363 if (!memcmp(line, "From ", 5) || !memcmp(line, ">From ", 6))
364 return 1;
365
ef29c117
JH
366 while ((ch = *cp++)) {
367 if (ch == ':')
368 return cp != line;
369 if ((33 <= ch && ch <= 57) ||
370 (59 <= ch && ch <= 126))
371 continue;
372 break;
373 }
374 return 0;
375}
376
34fc5cef
LT
377/*
378 * sz is size of 'line' buffer in bytes. Must be reasonably
379 * long enough to hold one physical real-world e-mail line.
380 */
d4a9ce78
JH
381static int read_one_header_line(char *line, int sz, FILE *in)
382{
34fc5cef
LT
383 int len;
384
385 /*
386 * We will read at most (sz-1) bytes and then potentially
387 * re-add NUL after it. Accessing line[sz] after this is safe
388 * and we can allow len to grow up to and including sz.
389 */
390 sz--;
391
392 /* Get the first part of the line. */
393 if (!fgets(line, sz, in))
394 return 0;
395
396 /*
397 * Is it an empty line or not a valid rfc2822 header?
398 * If so, stop here, and return false ("not a header")
399 */
400 len = eatspace(line);
401 if (!len || !is_rfc2822_header(line)) {
402 /* Re-add the newline */
403 line[len] = '\n';
404 line[len + 1] = '\0';
405 return 0;
406 }
407
408 /*
409 * Now we need to eat all the continuation lines..
410 * Yuck, 2822 header "folding"
411 */
412 for (;;) {
413 int peek, addlen;
414 static char continuation[1000];
415
f30b2028
EB
416 peek = fgetc(in); ungetc(peek, in);
417 if (peek != ' ' && peek != '\t')
418 break;
34fc5cef
LT
419 if (!fgets(continuation, sizeof(continuation), in))
420 break;
421 addlen = eatspace(continuation);
422 if (len < sz - 1) {
423 if (addlen >= sz - len)
424 addlen = sz - len - 1;
425 memcpy(line + len, continuation, addlen);
d7f6bae2 426 line[len] = '\n';
34fc5cef
LT
427 len += addlen;
428 }
d4a9ce78 429 }
34fc5cef
LT
430 line[len] = 0;
431
432 return 1;
d4a9ce78
JH
433}
434
8dabdfcc 435static int decode_q_segment(char *in, char *ot, unsigned otsize, char *ep, int rfc2047)
d4a9ce78 436{
8dabdfcc 437 char *otend = ot + otsize;
d4a9ce78
JH
438 int c;
439 while ((c = *in++) != 0 && (in <= ep)) {
8dabdfcc
AR
440 if (ot == otend) {
441 *--ot = '\0';
442 return -1;
443 }
d4a9ce78
JH
444 if (c == '=') {
445 int d = *in++;
446 if (d == '\n' || !d)
447 break; /* drop trailing newline */
448 *ot++ = ((hexval(d) << 4) | hexval(*in++));
75731930 449 continue;
d4a9ce78 450 }
75731930
JH
451 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
452 c = 0x20;
453 *ot++ = c;
d4a9ce78
JH
454 }
455 *ot = 0;
456 return 0;
457}
458
8dabdfcc 459static int decode_b_segment(char *in, char *ot, unsigned otsize, char *ep)
d4a9ce78
JH
460{
461 /* Decode in..ep, possibly in-place to ot */
462 int c, pos = 0, acc = 0;
8dabdfcc 463 char *otend = ot + otsize;
d4a9ce78
JH
464
465 while ((c = *in++) != 0 && (in <= ep)) {
8dabdfcc
AR
466 if (ot == otend) {
467 *--ot = '\0';
468 return -1;
469 }
d4a9ce78
JH
470 if (c == '+')
471 c = 62;
472 else if (c == '/')
473 c = 63;
474 else if ('A' <= c && c <= 'Z')
475 c -= 'A';
476 else if ('a' <= c && c <= 'z')
477 c -= 'a' - 26;
478 else if ('0' <= c && c <= '9')
479 c -= '0' - 52;
480 else if (c == '=') {
481 /* padding is almost like (c == 0), except we do
482 * not output NUL resulting only from it;
483 * for now we just trust the data.
484 */
485 c = 0;
486 }
487 else
488 continue; /* garbage */
489 switch (pos++) {
490 case 0:
491 acc = (c << 2);
492 break;
493 case 1:
494 *ot++ = (acc | (c >> 4));
495 acc = (c & 15) << 4;
496 break;
497 case 2:
498 *ot++ = (acc | (c >> 2));
499 acc = (c & 3) << 6;
500 break;
501 case 3:
502 *ot++ = (acc | c);
503 acc = pos = 0;
504 break;
505 }
506 }
507 *ot = 0;
508 return 0;
509}
510
b59d398b
LT
511/*
512 * When there is no known charset, guess.
513 *
514 * Right now we assume that if the target is UTF-8 (the default),
515 * and it already looks like UTF-8 (which includes US-ASCII as its
516 * subset, of course) then that is what it is and there is nothing
517 * to do.
518 *
519 * Otherwise, we default to assuming it is Latin1 for historical
520 * reasons.
521 */
522static const char *guess_charset(const char *line, const char *target_charset)
523{
524 if (is_encoding_utf8(target_charset)) {
525 if (is_utf8(line))
526 return NULL;
527 }
528 return "latin1";
529}
530
8dabdfcc 531static void convert_to_utf8(char *line, unsigned linesize, const char *charset)
d4a9ce78 532{
b59d398b
LT
533 char *out;
534
535 if (!charset || !*charset) {
536 charset = guess_charset(line, metainfo_charset);
537 if (!charset)
538 return;
539 }
b45974a6 540
7296096c
JS
541 if (!strcmp(metainfo_charset, charset))
542 return;
b59d398b 543 out = reencode_string(line, metainfo_charset, charset);
bb1091a4
JH
544 if (!out)
545 die("cannot convert from %s to %s\n",
b59d398b 546 charset, metainfo_charset);
8dabdfcc 547 strlcpy(line, out, linesize);
b45974a6 548 free(out);
d4a9ce78
JH
549}
550
8dabdfcc 551static int decode_header_bq(char *it, unsigned itsize)
d4a9ce78
JH
552{
553 char *in, *out, *ep, *cp, *sp;
554 char outbuf[1000];
b75bf2c3 555 int rfc2047 = 0;
d4a9ce78
JH
556
557 in = it;
558 out = outbuf;
559 while ((ep = strstr(in, "=?")) != NULL) {
560 int sz, encoding;
561 char charset_q[256], piecebuf[256];
b75bf2c3
JH
562 rfc2047 = 1;
563
d4a9ce78
JH
564 if (in != ep) {
565 sz = ep - in;
566 memcpy(out, in, sz);
567 out += sz;
568 in += sz;
569 }
570 /* E.g.
571 * ep : "=?iso-2022-jp?B?GyR...?= foo"
572 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
573 */
574 ep += 2;
575 cp = strchr(ep, '?');
576 if (!cp)
b75bf2c3 577 return rfc2047; /* no munging */
d4a9ce78
JH
578 for (sp = ep; sp < cp; sp++)
579 charset_q[sp - ep] = tolower(*sp);
580 charset_q[cp - ep] = 0;
581 encoding = cp[1];
582 if (!encoding || cp[2] != '?')
b75bf2c3 583 return rfc2047; /* no munging */
d4a9ce78
JH
584 ep = strstr(cp + 3, "?=");
585 if (!ep)
b75bf2c3 586 return rfc2047; /* no munging */
d4a9ce78
JH
587 switch (tolower(encoding)) {
588 default:
b75bf2c3 589 return rfc2047; /* no munging */
d4a9ce78 590 case 'b':
8dabdfcc 591 sz = decode_b_segment(cp + 3, piecebuf, sizeof(piecebuf), ep);
d4a9ce78
JH
592 break;
593 case 'q':
8dabdfcc 594 sz = decode_q_segment(cp + 3, piecebuf, sizeof(piecebuf), ep, 1);
d4a9ce78
JH
595 break;
596 }
597 if (sz < 0)
b75bf2c3 598 return rfc2047;
650e4be5 599 if (metainfo_charset)
8dabdfcc
AR
600 convert_to_utf8(piecebuf, sizeof(piecebuf), charset_q);
601
602 sz = strlen(piecebuf);
603 if (outbuf + sizeof(outbuf) <= out + sz)
604 return rfc2047; /* no munging */
d4a9ce78 605 strcpy(out, piecebuf);
8dabdfcc 606 out += sz;
d4a9ce78
JH
607 in = ep + 2;
608 }
609 strcpy(out, in);
8dabdfcc 610 strlcpy(it, outbuf, itsize);
b75bf2c3
JH
611 return rfc2047;
612}
613
8dabdfcc 614static void decode_header(char *it, unsigned itsize)
b75bf2c3
JH
615{
616
8dabdfcc 617 if (decode_header_bq(it, itsize))
b75bf2c3
JH
618 return;
619 /* otherwise "it" is a straight copy of the input.
620 * This can be binary guck but there is no charset specified.
621 */
622 if (metainfo_charset)
8dabdfcc 623 convert_to_utf8(it, itsize, "");
d4a9ce78
JH
624}
625
8dabdfcc 626static void decode_transfer_encoding(char *line, unsigned linesize)
d4a9ce78
JH
627{
628 char *ep;
629
630 switch (transfer_encoding) {
631 case TE_QP:
632 ep = line + strlen(line);
8dabdfcc 633 decode_q_segment(line, line, linesize, ep, 0);
d4a9ce78
JH
634 break;
635 case TE_BASE64:
636 ep = line + strlen(line);
8dabdfcc 637 decode_b_segment(line, line, linesize, ep);
d4a9ce78
JH
638 break;
639 case TE_DONTCARE:
640 break;
641 }
642}
643
8dabdfcc 644static int handle_filter(char *line, unsigned linesize);
87ab7992
DZ
645
646static int find_boundary(void)
2744b234 647{
87ab7992
DZ
648 while(fgets(line, sizeof(line), fin) != NULL) {
649 if (is_multipart_boundary(line))
650 return 1;
651 }
652 return 0;
653}
654
655static int handle_boundary(void)
656{
86747c13 657 char newline[]="\n";
87ab7992
DZ
658again:
659 if (!memcmp(line+content_top->boundary_len, "--", 2)) {
660 /* we hit an end boundary */
661 /* pop the current boundary off the stack */
662 free(content_top->boundary);
663
664 /* technically won't happen as is_multipart_boundary()
665 will fail first. But just in case..
666 */
667 if (content_top-- < content) {
668 fprintf(stderr, "Detected mismatched boundaries, "
669 "can't recover\n");
670 exit(1);
671 }
8dabdfcc 672 handle_filter(newline, sizeof(newline));
87ab7992
DZ
673
674 /* skip to the next boundary */
675 if (!find_boundary())
676 return 0;
677 goto again;
678 }
679
680 /* set some defaults */
681 transfer_encoding = TE_DONTCARE;
682 charset[0] = 0;
683 message_type = TYPE_TEXT;
d4a9ce78 684
87ab7992
DZ
685 /* slurp in this section's info */
686 while (read_one_header_line(line, sizeof(line), fin))
8dabdfcc 687 check_header(line, sizeof(line), p_hdr_data, 0);
2744b234 688
87ab7992
DZ
689 /* eat the blank line after section info */
690 return (fgets(line, sizeof(line), fin) != NULL);
d4a9ce78
JH
691}
692
f0658cf2
DZ
693static inline int patchbreak(const char *line)
694{
695 /* Beginning of a "diff -" header? */
696 if (!memcmp("diff -", line, 6))
697 return 1;
698
699 /* CVS "Index: " line? */
700 if (!memcmp("Index: ", line, 7))
701 return 1;
702
703 /*
704 * "--- <filename>" starts patches without headers
705 * "---<sp>*" is a manual separator
706 */
707 if (!memcmp("---", line, 3)) {
708 line += 3;
709 /* space followed by a filename? */
710 if (line[0] == ' ' && !isspace(line[1]))
711 return 1;
712 /* Just whitespace? */
713 for (;;) {
714 unsigned char c = *line++;
715 if (c == '\n')
716 return 1;
717 if (!isspace(c))
718 break;
719 }
720 return 0;
721 }
722 return 0;
723}
724
725
8dabdfcc 726static int handle_commit_msg(char *line, unsigned linesize)
d4a9ce78 727{
87ab7992 728 static int still_looking = 1;
8dabdfcc 729 char *endline = line + linesize;
87ab7992 730
d4a9ce78
JH
731 if (!cmitmsg)
732 return 0;
2744b234 733
87ab7992
DZ
734 if (still_looking) {
735 char *cp = line;
736 if (isspace(*line)) {
737 for (cp = line + 1; *cp; cp++) {
738 if (!isspace(*cp))
739 break;
740 }
741 if (!*cp)
742 return 0;
743 }
8dabdfcc 744 if ((still_looking = check_header(cp, endline - cp, s_hdr_data, 0)) != 0)
87ab7992
DZ
745 return 0;
746 }
8b4525fb 747
86747c13
DZ
748 /* normalize the log message to UTF-8. */
749 if (metainfo_charset)
8dabdfcc 750 convert_to_utf8(line, endline - line, charset);
86747c13 751
f0658cf2 752 if (patchbreak(line)) {
87ab7992
DZ
753 fclose(cmitmsg);
754 cmitmsg = NULL;
755 return 1;
756 }
8b4525fb 757
87ab7992 758 fputs(line, cmitmsg);
d4a9ce78 759 return 0;
2744b234
LT
760}
761
87ab7992 762static int handle_patch(char *line)
2744b234 763{
87ab7992
DZ
764 fputs(line, patchfile);
765 patch_lines++;
766 return 0;
2744b234
LT
767}
768
8dabdfcc 769static int handle_filter(char *line, unsigned linesize)
2744b234 770{
87ab7992 771 static int filter = 0;
2744b234 772
87ab7992
DZ
773 /* filter tells us which part we left off on
774 * a non-zero return indicates we hit a filter point
775 */
776 switch (filter) {
777 case 0:
8dabdfcc 778 if (!handle_commit_msg(line, linesize))
d4a9ce78 779 break;
87ab7992
DZ
780 filter++;
781 case 1:
782 if (!handle_patch(line))
783 break;
784 filter++;
785 default:
786 return 1;
2744b234 787 }
87ab7992 788
d4a9ce78 789 return 0;
2744b234
LT
790}
791
87ab7992 792static void handle_body(void)
1d8fa411 793{
87ab7992
DZ
794 int rc = 0;
795 static char newline[2000];
796 static char *np = newline;
d4a9ce78
JH
797
798 /* Skip up to the first boundary */
87ab7992
DZ
799 if (content_top->boundary) {
800 if (!find_boundary())
801 return;
802 }
803
804 do {
805 /* process any boundary lines */
806 if (content_top->boundary && is_multipart_boundary(line)) {
807 /* flush any leftover */
808 if ((transfer_encoding == TE_BASE64) &&
809 (np != newline)) {
8dabdfcc 810 handle_filter(newline, sizeof(newline));
87ab7992
DZ
811 }
812 if (!handle_boundary())
813 return;
814 }
815
86747c13 816 /* Unwrap transfer encoding */
8dabdfcc 817 decode_transfer_encoding(line, sizeof(line));
87ab7992
DZ
818
819 switch (transfer_encoding) {
820 case TE_BASE64:
87f1b884 821 case TE_QP:
87ab7992
DZ
822 {
823 char *op = line;
824
825 /* binary data most likely doesn't have newlines */
826 if (message_type != TYPE_TEXT) {
8dabdfcc 827 rc = handle_filter(line, sizeof(newline));
87ab7992
DZ
828 break;
829 }
830
831 /* this is a decoded line that may contain
832 * multiple new lines. Pass only one chunk
833 * at a time to handle_filter()
834 */
835
836 do {
837 while (*op != '\n' && *op != 0)
838 *np++ = *op++;
839 *np = *op;
840 if (*np != 0) {
841 /* should be sitting on a new line */
842 *(++np) = 0;
843 op++;
8dabdfcc 844 rc = handle_filter(newline, sizeof(newline));
87ab7992
DZ
845 np = newline;
846 }
847 } while (*op != 0);
848 /* the partial chunk is saved in newline and
849 * will be appended by the next iteration of fgets
850 */
d4a9ce78 851 break;
1d8fa411 852 }
87ab7992 853 default:
8dabdfcc 854 rc = handle_filter(line, sizeof(newline));
d4a9ce78 855 }
87ab7992
DZ
856 if (rc)
857 /* nothing left to filter */
858 break;
859 } while (fgets(line, sizeof(line), fin));
860
861 return;
1d8fa411
JH
862}
863
d7f6bae2
JH
864static void output_header_lines(FILE *fout, const char *hdr, char *data)
865{
866 while (1) {
867 char *ep = strchr(data, '\n');
868 int len;
869 if (!ep)
870 len = strlen(data);
871 else
872 len = ep - data;
873 fprintf(fout, "%s: %.*s\n", hdr, len, data);
874 if (!ep)
875 break;
876 data = ep + 1;
877 }
878}
879
87ab7992 880static void handle_info(void)
2744b234 881{
87ab7992
DZ
882 char *sub;
883 char *hdr;
884 int i;
885
886 for (i = 0; header[i]; i++) {
887
888 /* only print inbody headers if we output a patch file */
889 if (patch_lines && s_hdr_data[i])
890 hdr = s_hdr_data[i];
891 else if (p_hdr_data[i])
892 hdr = p_hdr_data[i];
893 else
894 continue;
895
896 if (!memcmp(header[i], "Subject", 7)) {
d7f6bae2
JH
897 if (keep_subject)
898 sub = hdr;
899 else {
900 sub = cleanup_subject(hdr);
901 cleanup_space(sub);
902 }
903 output_header_lines(fout, "Subject", sub);
87ab7992
DZ
904 } else if (!memcmp(header[i], "From", 4)) {
905 handle_from(hdr);
906 fprintf(fout, "Author: %s\n", name);
907 fprintf(fout, "Email: %s\n", email);
908 } else {
909 cleanup_space(hdr);
910 fprintf(fout, "%s: %s\n", header[i], hdr);
911 }
d4a9ce78 912 }
87ab7992 913 fprintf(fout, "\n");
2744b234
LT
914}
915
fcd056a6
JH
916static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
917 const char *msg, const char *patch)
34488e3c 918{
f88a545a 919 int peek;
34488e3c
LS
920 keep_subject = ks;
921 metainfo_charset = encoding;
922 fin = in;
923 fout = out;
924
925 cmitmsg = fopen(msg, "w");
926 if (!cmitmsg) {
927 perror(msg);
928 return -1;
929 }
930 patchfile = fopen(patch, "w");
931 if (!patchfile) {
932 perror(patch);
933 fclose(cmitmsg);
934 return -1;
935 }
87ab7992
DZ
936
937 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
938 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
939
f88a545a
SS
940 do {
941 peek = fgetc(in);
942 } while (isspace(peek));
943 ungetc(peek, in);
944
87ab7992
DZ
945 /* process the email header */
946 while (read_one_header_line(line, sizeof(line), fin))
8dabdfcc 947 check_header(line, sizeof(line), p_hdr_data, 1);
87ab7992
DZ
948
949 handle_body();
950 handle_info();
34488e3c
LS
951
952 return 0;
953}
954
6bff6a60 955static const char mailinfo_usage[] =
9f63892b 956 "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
d4a9ce78 957
a633fca0 958int cmd_mailinfo(int argc, const char **argv, const char *prefix)
2744b234 959{
bb1091a4
JH
960 const char *def_charset;
961
f1f909e3
JH
962 /* NEEDSWORK: might want to do the optional .git/ directory
963 * discovery
964 */
ef90d6d4 965 git_config(git_default_config, NULL);
f1f909e3 966
bb1091a4
JH
967 def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
968 metainfo_charset = def_charset;
969
6bff6a60
JH
970 while (1 < argc && argv[1][0] == '-') {
971 if (!strcmp(argv[1], "-k"))
972 keep_subject = 1;
d4a9ce78 973 else if (!strcmp(argv[1], "-u"))
bb1091a4
JH
974 metainfo_charset = def_charset;
975 else if (!strcmp(argv[1], "-n"))
976 metainfo_charset = NULL;
cc44c765 977 else if (!prefixcmp(argv[1], "--encoding="))
9f63892b 978 metainfo_charset = argv[1] + 11;
d4a9ce78 979 else
f1f909e3 980 usage(mailinfo_usage);
6bff6a60
JH
981 argc--; argv++;
982 }
983
a196d8d4 984 if (argc != 3)
f1f909e3 985 usage(mailinfo_usage);
34488e3c
LS
986
987 return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
2744b234 988}