2 * Another stupid program, this one parsing the headers of an
3 * email to figure out authorship and subject
11 #include "git-compat-util.h"
14 static FILE *cmitmsg
, *patchfile
;
16 static int keep_subject
= 0;
17 static char *metainfo_charset
= NULL
;
18 static char line
[1000];
19 static char date
[1000];
20 static char name
[1000];
21 static char email
[1000];
22 static char subject
[1000];
25 TE_DONTCARE
, TE_QP
, TE_BASE64
,
27 static char charset
[256];
29 static char multipart_boundary
[1000];
30 static int multipart_boundary_len
;
31 static int patch_lines
= 0;
33 static char *sanity_check(char *name
, char *email
)
35 int len
= strlen(name
);
36 if (len
< 3 || len
> 60)
38 if (strchr(name
, '@') || strchr(name
, '<') || strchr(name
, '>'))
43 static int bogus_from(char *line
)
45 /* John Doe <johndoe> */
46 char *bra
, *ket
, *dst
, *cp
;
48 /* This is fallback, so do not bother if we already have an
54 bra
= strchr(line
, '<');
57 ket
= strchr(bra
, '>');
61 for (dst
= email
, cp
= bra
+1; cp
< ket
; )
64 for (cp
= line
; isspace(*cp
); cp
++)
66 for (bra
--; isspace(*bra
); bra
--)
68 cp
= sanity_check(cp
, email
);
73 static int handle_from(char *line
)
75 char *at
= strchr(line
, '@');
79 return bogus_from(line
);
82 * If we already have one email, don't take any confusing lines
84 if (*email
&& strchr(at
+1, '@'))
87 /* Pick up the string around '@', possibly delimited with <>
88 * pair; that is the email part. White them out while copying.
102 unsigned char c
= *at
;
103 if (!c
|| c
== '>' || isspace(c
)) {
113 /* The remainder is name. It could be "John Doe <john.doe@xz>"
114 * or "john.doe@xz (John Doe)", but we have whited out the
115 * email part, so trim from both ends, possibly removing
116 * the () pair at the end.
118 at
= line
+ strlen(line
);
120 unsigned char c
= *--at
;
122 at
[(c
== ')') ? 0 : 1] = 0;
129 unsigned char c
= *at
;
130 if (!c
|| !isspace(c
)) {
137 at
= sanity_check(at
, email
);
142 static int handle_date(char *line
)
148 static int handle_subject(char *line
)
150 strcpy(subject
, line
);
154 /* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
155 * to have enough heuristics to grok MIME encoded patches often found
156 * on our mailing lists. For example, we do not even treat header lines
157 * case insensitively.
160 static int slurp_attr(const char *line
, const char *name
, char *attr
)
162 char *ends
, *ap
= strcasestr(line
, name
);
176 sz
= strcspn(ap
, ends
);
177 memcpy(attr
, ap
, sz
);
182 static int handle_subcontent_type(char *line
)
184 /* We do not want to mess with boundary. Note that we do not
185 * handle nested multipart.
187 if (strcasestr(line
, "boundary=")) {
188 fprintf(stderr
, "Not handling nested multipart message.\n");
191 slurp_attr(line
, "charset=", charset
);
194 for (i
= 0; (c
= charset
[i
]) != 0; i
++)
195 charset
[i
] = tolower(c
);
200 static int handle_content_type(char *line
)
202 *multipart_boundary
= 0;
203 if (slurp_attr(line
, "boundary=", multipart_boundary
+ 2)) {
204 memcpy(multipart_boundary
, "--", 2);
205 multipart_boundary_len
= strlen(multipart_boundary
);
207 slurp_attr(line
, "charset=", charset
);
211 static int handle_content_transfer_encoding(char *line
)
213 if (strcasestr(line
, "base64"))
214 transfer_encoding
= TE_BASE64
;
215 else if (strcasestr(line
, "quoted-printable"))
216 transfer_encoding
= TE_QP
;
218 transfer_encoding
= TE_DONTCARE
;
222 static int is_multipart_boundary(const char *line
)
224 return (!memcmp(line
, multipart_boundary
, multipart_boundary_len
));
227 static int eatspace(char *line
)
229 int len
= strlen(line
);
230 while (len
> 0 && isspace(line
[len
-1]))
237 #define SEEN_SUBJECT 04
239 /* First lines of body can have From:, Date:, and Subject: */
240 static int handle_inbody_header(int *seen
, char *line
)
242 if (!memcmp("From:", line
, 5) && isspace(line
[5])) {
243 if (!(*seen
& SEEN_FROM
) && handle_from(line
+6)) {
248 if (!memcmp("Date:", line
, 5) && isspace(line
[5])) {
249 if (!(*seen
& SEEN_DATE
)) {
255 if (!memcmp("Subject:", line
, 8) && isspace(line
[8])) {
256 if (!(*seen
& SEEN_SUBJECT
)) {
257 handle_subject(line
+9);
258 *seen
|= SEEN_SUBJECT
;
262 if (!memcmp("[PATCH]", line
, 7) && isspace(line
[7])) {
263 if (!(*seen
& SEEN_SUBJECT
)) {
264 handle_subject(line
);
265 *seen
|= SEEN_SUBJECT
;
272 static char *cleanup_subject(char *subject
)
281 if (!memcmp("e:", subject
+1, 2)) {
286 case ' ': case '\t': case ':':
291 p
= strchr(subject
, ']');
297 remove
= p
- subject
;
298 if (remove
<= len
*2) {
308 static void cleanup_space(char *buf
)
311 while ((c
= *buf
) != 0) {
317 int len
= strlen(buf
);
318 memmove(buf
, buf
+1, len
);
325 typedef int (*header_fn_t
)(char *);
332 static void check_header(char *line
, int len
, struct header_def
*header
)
336 if (header
[0].namelen
<= 0) {
337 for (i
= 0; header
[i
].name
; i
++)
338 header
[i
].namelen
= strlen(header
[i
].name
);
340 for (i
= 0; header
[i
].name
; i
++) {
341 int len
= header
[i
].namelen
;
342 if (!strncasecmp(line
, header
[i
].name
, len
) &&
343 line
[len
] == ':' && isspace(line
[len
+ 1])) {
344 header
[i
].func(line
+ len
+ 2);
350 static void check_subheader_line(char *line
, int len
)
352 static struct header_def header
[] = {
353 { "Content-Type", handle_subcontent_type
},
354 { "Content-Transfer-Encoding",
355 handle_content_transfer_encoding
},
358 check_header(line
, len
, header
);
360 static void check_header_line(char *line
, int len
)
362 static struct header_def header
[] = {
363 { "From", handle_from
},
364 { "Date", handle_date
},
365 { "Subject", handle_subject
},
366 { "Content-Type", handle_content_type
},
367 { "Content-Transfer-Encoding",
368 handle_content_transfer_encoding
},
371 check_header(line
, len
, header
);
374 static int read_one_header_line(char *line
, int sz
, FILE *in
)
379 if (fgets(line
+ ofs
, sz
- ofs
, in
) == NULL
)
381 len
= eatspace(line
+ ofs
);
384 peek
= fgetc(in
); ungetc(peek
, in
);
385 if (peek
== ' ' || peek
== '\t') {
386 /* Yuck, 2822 header "folding" */
395 static unsigned hexval(int c
)
397 if (c
>= '0' && c
<= '9')
399 if (c
>= 'a' && c
<= 'f')
401 if (c
>= 'A' && c
<= 'F')
406 static int decode_q_segment(char *in
, char *ot
, char *ep
)
409 while ((c
= *in
++) != 0 && (in
<= ep
)) {
413 break; /* drop trailing newline */
414 *ot
++ = ((hexval(d
) << 4) | hexval(*in
++));
423 static int decode_b_segment(char *in
, char *ot
, char *ep
)
425 /* Decode in..ep, possibly in-place to ot */
426 int c
, pos
= 0, acc
= 0;
428 while ((c
= *in
++) != 0 && (in
<= ep
)) {
433 else if ('A' <= c
&& c
<= 'Z')
435 else if ('a' <= c
&& c
<= 'z')
437 else if ('0' <= c
&& c
<= '9')
440 /* padding is almost like (c == 0), except we do
441 * not output NUL resulting only from it;
442 * for now we just trust the data.
447 continue; /* garbage */
453 *ot
++ = (acc
| (c
>> 4));
457 *ot
++ = (acc
| (c
>> 2));
470 static void convert_to_utf8(char *line
, char *charset
)
473 size_t insize
, outsize
, nrc
;
474 char outbuf
[4096]; /* cheat */
475 static char latin_one
[] = "latin1";
476 char *input_charset
= *charset
? charset
: latin_one
;
477 iconv_t conv
= iconv_open(metainfo_charset
, input_charset
);
479 if (conv
== (iconv_t
) -1) {
480 static int warned_latin1_once
= 0;
481 if (input_charset
!= latin_one
) {
482 fprintf(stderr
, "cannot convert from %s to %s\n",
483 input_charset
, metainfo_charset
);
486 else if (!warned_latin1_once
) {
487 warned_latin1_once
= 1;
488 fprintf(stderr
, "tried to convert from %s to %s, "
489 "but your iconv does not work with it.\n",
490 input_charset
, metainfo_charset
);
497 outsize
= sizeof(outbuf
);
498 nrc
= iconv(conv
, &in
, &insize
, &out
, &outsize
);
500 if (nrc
== (size_t) -1)
503 strcpy(line
, outbuf
);
506 static void decode_header_bq(char *it
)
508 char *in
, *out
, *ep
, *cp
, *sp
;
513 while ((ep
= strstr(in
, "=?")) != NULL
) {
515 char charset_q
[256], piecebuf
[256];
523 * ep : "=?iso-2022-jp?B?GyR...?= foo"
524 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
527 cp
= strchr(ep
, '?');
529 return; /* no munging */
530 for (sp
= ep
; sp
< cp
; sp
++)
531 charset_q
[sp
- ep
] = tolower(*sp
);
532 charset_q
[cp
- ep
] = 0;
534 if (!encoding
|| cp
[2] != '?')
535 return; /* no munging */
536 ep
= strstr(cp
+ 3, "?=");
538 return; /* no munging */
539 switch (tolower(encoding
)) {
541 return; /* no munging */
543 sz
= decode_b_segment(cp
+ 3, piecebuf
, ep
);
546 sz
= decode_q_segment(cp
+ 3, piecebuf
, ep
);
551 if (metainfo_charset
)
552 convert_to_utf8(piecebuf
, charset_q
);
553 strcpy(out
, piecebuf
);
561 static void decode_transfer_encoding(char *line
)
565 switch (transfer_encoding
) {
567 ep
= line
+ strlen(line
);
568 decode_q_segment(line
, line
, ep
);
571 ep
= line
+ strlen(line
);
572 decode_b_segment(line
, line
, ep
);
579 static void handle_info(void)
582 static int done_info
= 0;
588 sub
= cleanup_subject(subject
);
591 cleanup_space(email
);
594 /* Unwrap inline B and Q encoding, and optionally
595 * normalize the meta information to utf8.
597 decode_header_bq(name
);
598 decode_header_bq(date
);
599 decode_header_bq(email
);
600 decode_header_bq(sub
);
601 printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
602 name
, email
, sub
, date
);
605 /* We are inside message body and have read line[] already.
606 * Spit out the commit log.
608 static int handle_commit_msg(void)
613 if (!memcmp("diff -", line
, 6) ||
614 !memcmp("---", line
, 3) ||
615 !memcmp("Index: ", line
, 7))
617 if ((multipart_boundary
[0] && is_multipart_boundary(line
))) {
618 /* We come here when the first part had only
619 * the commit message without any patch. We
620 * pretend we have not seen this line yet, and
621 * go back to the loop.
626 /* Unwrap transfer encoding and optionally
627 * normalize the log message to UTF-8.
629 decode_transfer_encoding(line
);
630 if (metainfo_charset
)
631 convert_to_utf8(line
, charset
);
632 fputs(line
, cmitmsg
);
633 } while (fgets(line
, sizeof(line
), stdin
) != NULL
);
639 /* We have done the commit message and have the first
640 * line of the patch in line[].
642 static void handle_patch(void)
645 if (multipart_boundary
[0] && is_multipart_boundary(line
))
647 /* Only unwrap transfer encoding but otherwise do not
648 * do anything. We do *NOT* want UTF-8 conversion
649 * here; we are dealing with the user payload.
651 decode_transfer_encoding(line
);
652 fputs(line
, patchfile
);
654 } while (fgets(line
, sizeof(line
), stdin
) != NULL
);
657 /* multipart boundary and transfer encoding are set up for us, and we
658 * are at the end of the sub header. do equivalent of handle_body up
659 * to the next boundary without closing patchfile --- we will expect
660 * that the first part to contain commit message and a patch, and
661 * handle other parts as pure patches.
663 static int handle_multipart_one_part(void)
669 while (fgets(line
, sizeof(line
), stdin
) != NULL
) {
671 len
= eatspace(line
);
675 if (is_multipart_boundary(line
))
677 if (0 <= seen
&& handle_inbody_header(&seen
, line
))
679 seen
= -1; /* no more inbody headers */
682 if (handle_commit_msg())
692 static void handle_multipart_body(void)
696 /* Skip up to the first boundary */
697 while (fgets(line
, sizeof(line
), stdin
) != NULL
)
698 if (is_multipart_boundary(line
)) {
704 /* We are on boundary line. Start slurping the subhead. */
706 int len
= read_one_header_line(line
, sizeof(line
), stdin
);
708 if (handle_multipart_one_part() < 0)
712 check_subheader_line(line
, len
);
716 fprintf(stderr
, "No patch found\n");
721 /* Non multipart message */
722 static void handle_body(void)
726 while (fgets(line
, sizeof(line
), stdin
) != NULL
) {
727 int len
= eatspace(line
);
730 if (0 <= seen
&& handle_inbody_header(&seen
, line
))
732 seen
= -1; /* no more inbody headers */
741 fprintf(stderr
, "No patch found\n");
746 static const char mailinfo_usage
[] =
747 "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
749 int main(int argc
, char **argv
)
751 /* NEEDSWORK: might want to do the optional .git/ directory
754 git_config(git_default_config
);
756 while (1 < argc
&& argv
[1][0] == '-') {
757 if (!strcmp(argv
[1], "-k"))
759 else if (!strcmp(argv
[1], "-u"))
760 metainfo_charset
= git_commit_encoding
;
761 else if (!strncmp(argv
[1], "--encoding=", 11))
762 metainfo_charset
= argv
[1] + 11;
764 usage(mailinfo_usage
);
769 usage(mailinfo_usage
);
770 cmitmsg
= fopen(argv
[1], "w");
775 patchfile
= fopen(argv
[2], "w");
781 int len
= read_one_header_line(line
, sizeof(line
), stdin
);
783 if (multipart_boundary
[0])
784 handle_multipart_body();
789 check_header_line(line
, len
);