2 * Another stupid program, this one parsing the headers of an
3 * email to figure out authorship and subject
9 static FILE *cmitmsg, *patchfile, *fin, *fout;
11 static int keep_subject;
12 static const char *metainfo_charset;
13 static char line[1000];
14 static char name[1000];
15 static char email[1000];
18 TE_DONTCARE, TE_QP, TE_BASE64,
21 TYPE_TEXT, TYPE_OTHER,
24 static char charset[256];
25 static int patch_lines;
26 static char **p_hdr_data, **s_hdr_data;
28 #define MAX_HDR_PARSED 10
29 #define MAX_BOUNDARIES 5
31 static char *sanity_check(char *name, char *email)
33 int len = strlen(name);
34 if (len < 3 || len > 60)
36 if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
41 static int bogus_from(char *line)
43 /* John Doe <johndoe> */
44 char *bra, *ket, *dst, *cp;
46 /* This is fallback, so do not bother if we already have an
52 bra = strchr(line, '<');
55 ket = strchr(bra, '>');
59 for (dst = email, cp = bra+1; cp < ket; )
62 for (cp = line; isspace(*cp); cp++)
64 for (bra--; isspace(*bra); bra--)
66 cp = sanity_check(cp, email);
71 static int handle_from(char *in_line)
77 strcpy(line, in_line);
78 at = strchr(line, '@');
80 return bogus_from(line);
83 * If we already have one email, don't take any confusing lines
85 if (*email && strchr(at+1, '@'))
88 /* Pick up the string around '@', possibly delimited with <>
89 * pair; that is the email part. White them out while copying.
103 unsigned char c = *at;
104 if (!c || c == '>' || isspace(c)) {
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.
119 at = line + strlen(line);
121 unsigned char c = *--at;
123 at[(c == ')') ? 0 : 1] = 0;
130 unsigned char c = *at;
131 if (!c || !isspace(c)) {
138 at = sanity_check(at, email);
143 static int handle_header(char *line, char *data, int ofs)
148 strcpy(data, line+ofs);
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.
159 static int slurp_attr(const char *line, const char *name, char *attr)
161 const char *ends, *ap = strcasestr(line, name);
175 sz = strcspn(ap, ends);
176 memcpy(attr, ap, sz);
181 struct content_type {
186 static struct content_type content[MAX_BOUNDARIES];
188 static struct content_type *content_top = content;
190 static int handle_content_type(char *line)
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");
202 content_top->boundary_len = strlen(boundary);
203 content_top->boundary = xmalloc(content_top->boundary_len+1);
204 strcpy(content_top->boundary, boundary);
206 if (slurp_attr(line, "charset=", charset)) {
208 for (i = 0; (c = charset[i]) != 0; i++)
209 charset[i] = tolower(c);
214 static int handle_content_transfer_encoding(char *line)
216 if (strcasestr(line, "base64"))
217 transfer_encoding = TE_BASE64;
218 else if (strcasestr(line, "quoted-printable"))
219 transfer_encoding = TE_QP;
221 transfer_encoding = TE_DONTCARE;
225 static int is_multipart_boundary(const char *line)
227 return (!memcmp(line, content_top->boundary, content_top->boundary_len));
230 static int eatspace(char *line)
232 int len = strlen(line);
233 while (len > 0 && isspace(line[len-1]))
238 static char *cleanup_subject(char *subject)
247 if (!memcmp("e:", subject+1, 2)) {
252 case ' ': case '\t': case ':':
257 p = strchr(subject, ']');
263 remove = p - subject;
264 if (remove <= len *2) {
275 static void cleanup_space(char *buf)
278 while ((c = *buf) != 0) {
284 int len = strlen(buf);
285 memmove(buf, buf+1, len);
292 static void decode_header(char *it);
293 static char *header[MAX_HDR_PARSED] = {
294 "From","Subject","Date",
297 static int check_header(char *line, char **hdr_data)
301 /* search for the interesting parts */
302 for (i = 0; header[i]; i++) {
303 int len = strlen(header[i]);
305 !strncasecmp(line, header[i], len) &&
306 line[len] == ':' && isspace(line[len + 1])) {
307 /* Unwrap inline B and Q encoding, and optionally
308 * normalize the meta information to utf8.
310 decode_header(line + len + 2);
311 hdr_data[i] = xmalloc(1000 * sizeof(char));
312 if (! handle_header(line, hdr_data[i], len + 2)) {
319 if (!strncasecmp(line, "Content-Type", 12) &&
320 line[12] == ':' && isspace(line[12 + 1])) {
321 decode_header(line + 12 + 2);
322 if (! handle_content_type(line)) {
326 if (!strncasecmp(line, "Content-Transfer-Encoding", 25) &&
327 line[25] == ':' && isspace(line[25 + 1])) {
328 decode_header(line + 25 + 2);
329 if (! handle_content_transfer_encoding(line)) {
334 /* for inbody stuff */
335 if (!memcmp(">From", line, 5) && isspace(line[5]))
337 if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
338 for (i = 0; header[i]; i++) {
339 if (!memcmp("Subject: ", header[i], 9)) {
340 if (! handle_header(line, hdr_data[i], 0)) {
351 static int is_rfc2822_header(char *line)
354 * The section that defines the loosest possible
355 * field name is "3.6.8 Optional fields".
357 * optional-field = field-name ":" unstructured CRLF
358 * field-name = 1*ftext
359 * ftext = %d33-57 / %59-126
364 /* Count mbox From headers as headers */
365 if (!memcmp(line, "From ", 5) || !memcmp(line, ">From ", 6))
368 while ((ch = *cp++)) {
371 if ((33 <= ch && ch <= 57) ||
372 (59 <= ch && ch <= 126))
380 * sz is size of 'line' buffer in bytes. Must be reasonably
381 * long enough to hold one physical real-world e-mail line.
383 static int read_one_header_line(char *line, int sz, FILE *in)
388 * We will read at most (sz-1) bytes and then potentially
389 * re-add NUL after it. Accessing line[sz] after this is safe
390 * and we can allow len to grow up to and including sz.
394 /* Get the first part of the line. */
395 if (!fgets(line, sz, in))
399 * Is it an empty line or not a valid rfc2822 header?
400 * If so, stop here, and return false ("not a header")
402 len = eatspace(line);
403 if (!len || !is_rfc2822_header(line)) {
404 /* Re-add the newline */
406 line[len + 1] = '\0';
411 * Now we need to eat all the continuation lines..
412 * Yuck, 2822 header "folding"
416 static char continuation[1000];
418 peek = fgetc(in); ungetc(peek, in);
419 if (peek != ' ' && peek != '\t')
421 if (!fgets(continuation, sizeof(continuation), in))
423 addlen = eatspace(continuation);
425 if (addlen >= sz - len)
426 addlen = sz - len - 1;
427 memcpy(line + len, continuation, addlen);
436 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
439 while ((c = *in++) != 0 && (in <= ep)) {
443 break; /* drop trailing newline */
444 *ot++ = ((hexval(d) << 4) | hexval(*in++));
447 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
455 static int decode_b_segment(char *in, char *ot, char *ep)
457 /* Decode in..ep, possibly in-place to ot */
458 int c, pos = 0, acc = 0;
460 while ((c = *in++) != 0 && (in <= ep)) {
465 else if ('A' <= c && c <= 'Z')
467 else if ('a' <= c && c <= 'z')
469 else if ('0' <= c && c <= '9')
472 /* padding is almost like (c == 0), except we do
473 * not output NUL resulting only from it;
474 * for now we just trust the data.
479 continue; /* garbage */
485 *ot++ = (acc | (c >> 4));
489 *ot++ = (acc | (c >> 2));
502 static void convert_to_utf8(char *line, const char *charset)
504 static const char latin_one[] = "latin1";
505 const char *input_charset = *charset ? charset : latin_one;
506 char *out = reencode_string(line, metainfo_charset, input_charset);
509 die("cannot convert from %s to %s\n",
510 input_charset, metainfo_charset);
515 static int decode_header_bq(char *it)
517 char *in, *out, *ep, *cp, *sp;
523 while ((ep = strstr(in, "=?")) != NULL) {
525 char charset_q[256], piecebuf[256];
535 * ep : "=?iso-2022-jp?B?GyR...?= foo"
536 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
539 cp = strchr(ep, '?');
541 return rfc2047; /* no munging */
542 for (sp = ep; sp < cp; sp++)
543 charset_q[sp - ep] = tolower(*sp);
544 charset_q[cp - ep] = 0;
546 if (!encoding || cp[2] != '?')
547 return rfc2047; /* no munging */
548 ep = strstr(cp + 3, "?=");
550 return rfc2047; /* no munging */
551 switch (tolower(encoding)) {
553 return rfc2047; /* no munging */
555 sz = decode_b_segment(cp + 3, piecebuf, ep);
558 sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
563 if (metainfo_charset)
564 convert_to_utf8(piecebuf, charset_q);
565 strcpy(out, piecebuf);
574 static void decode_header(char *it)
577 if (decode_header_bq(it))
579 /* otherwise "it" is a straight copy of the input.
580 * This can be binary guck but there is no charset specified.
582 if (metainfo_charset)
583 convert_to_utf8(it, "");
586 static void decode_transfer_encoding(char *line)
590 switch (transfer_encoding) {
592 ep = line + strlen(line);
593 decode_q_segment(line, line, ep, 0);
596 ep = line + strlen(line);
597 decode_b_segment(line, line, ep);
604 static int handle_filter(char *line);
606 static int find_boundary(void)
608 while(fgets(line, sizeof(line), fin) != NULL) {
609 if (is_multipart_boundary(line))
615 static int handle_boundary(void)
618 if (!memcmp(line+content_top->boundary_len, "--", 2)) {
619 /* we hit an end boundary */
620 /* pop the current boundary off the stack */
621 free(content_top->boundary);
623 /* technically won't happen as is_multipart_boundary()
624 will fail first. But just in case..
626 if (content_top-- < content) {
627 fprintf(stderr, "Detected mismatched boundaries, "
633 /* skip to the next boundary */
634 if (!find_boundary())
639 /* set some defaults */
640 transfer_encoding = TE_DONTCARE;
642 message_type = TYPE_TEXT;
644 /* slurp in this section's info */
645 while (read_one_header_line(line, sizeof(line), fin))
646 check_header(line, p_hdr_data);
648 /* eat the blank line after section info */
649 return (fgets(line, sizeof(line), fin) != NULL);
652 static inline int patchbreak(const char *line)
654 /* Beginning of a "diff -" header? */
655 if (!memcmp("diff -", line, 6))
658 /* CVS "Index: " line? */
659 if (!memcmp("Index: ", line, 7))
663 * "--- <filename>" starts patches without headers
664 * "---<sp>*" is a manual separator
666 if (!memcmp("---", line, 3)) {
668 /* space followed by a filename? */
669 if (line[0] == ' ' && !isspace(line[1]))
671 /* Just whitespace? */
673 unsigned char c = *line++;
685 static int handle_commit_msg(char *line)
687 static int still_looking = 1;
694 if (isspace(*line)) {
695 for (cp = line + 1; *cp; cp++) {
702 if ((still_looking = check_header(cp, s_hdr_data)) != 0)
706 if (patchbreak(line)) {
712 fputs(line, cmitmsg);
716 static int handle_patch(char *line)
718 fputs(line, patchfile);
723 static int handle_filter(char *line)
725 static int filter = 0;
727 /* filter tells us which part we left off on
728 * a non-zero return indicates we hit a filter point
732 if (!handle_commit_msg(line))
736 if (!handle_patch(line))
746 static void handle_body(void)
749 static char newline[2000];
750 static char *np = newline;
752 /* Skip up to the first boundary */
753 if (content_top->boundary) {
754 if (!find_boundary())
759 /* process any boundary lines */
760 if (content_top->boundary && is_multipart_boundary(line)) {
761 /* flush any leftover */
762 if ((transfer_encoding == TE_BASE64) &&
764 handle_filter(newline);
766 if (!handle_boundary())
770 /* Unwrap transfer encoding and optionally
771 * normalize the log message to UTF-8.
773 decode_transfer_encoding(line);
774 if (metainfo_charset)
775 convert_to_utf8(line, charset);
777 switch (transfer_encoding) {
782 /* binary data most likely doesn't have newlines */
783 if (message_type != TYPE_TEXT) {
784 rc = handle_filter(line);
788 /* this is a decoded line that may contain
789 * multiple new lines. Pass only one chunk
790 * at a time to handle_filter()
794 while (*op != '\n' && *op != 0)
798 /* should be sitting on a new line */
801 rc = handle_filter(newline);
805 /* the partial chunk is saved in newline and
806 * will be appended by the next iteration of fgets
811 rc = handle_filter(line);
814 /* nothing left to filter */
816 } while (fgets(line, sizeof(line), fin));
821 static void handle_info(void)
827 for (i = 0; header[i]; i++) {
829 /* only print inbody headers if we output a patch file */
830 if (patch_lines && s_hdr_data[i])
832 else if (p_hdr_data[i])
837 if (!memcmp(header[i], "Subject", 7)) {
838 sub = cleanup_subject(hdr);
840 fprintf(fout, "Subject: %s\n", sub);
841 } else if (!memcmp(header[i], "From", 4)) {
843 fprintf(fout, "Author: %s\n", name);
844 fprintf(fout, "Email: %s\n", email);
847 fprintf(fout, "%s: %s\n", header[i], hdr);
853 int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
854 const char *msg, const char *patch)
857 metainfo_charset = encoding;
861 cmitmsg = fopen(msg, "w");
866 patchfile = fopen(patch, "w");
873 p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
874 s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
876 /* process the email header */
877 while (read_one_header_line(line, sizeof(line), fin))
878 check_header(line, p_hdr_data);
886 static const char mailinfo_usage[] =
887 "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
889 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
891 const char *def_charset;
893 /* NEEDSWORK: might want to do the optional .git/ directory
896 git_config(git_default_config);
898 def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
899 metainfo_charset = def_charset;
901 while (1 < argc && argv[1][0] == '-') {
902 if (!strcmp(argv[1], "-k"))
904 else if (!strcmp(argv[1], "-u"))
905 metainfo_charset = def_charset;
906 else if (!strcmp(argv[1], "-n"))
907 metainfo_charset = NULL;
908 else if (!prefixcmp(argv[1], "--encoding="))
909 metainfo_charset = argv[1] + 11;
911 usage(mailinfo_usage);
916 usage(mailinfo_usage);
918 return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);