Code

sscanf/strtoul: parse integers robustly
[git.git] / builtin-mailinfo.c
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"
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];
17 static enum  {
18         TE_DONTCARE, TE_QP, TE_BASE64,
19 } transfer_encoding;
20 static enum  {
21         TYPE_TEXT, TYPE_OTHER,
22 } message_type;
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)
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 }
41 static int bogus_from(char *line)
42 {
43         /* John Doe <johndoe> */
44         char *bra, *ket, *dst, *cp;
46         /* This is fallback, so do not bother if we already have an
47          * e-mail address.
48          */
49         if (*email)
50                 return 0;
52         bra = strchr(line, '<');
53         if (!bra)
54                 return 0;
55         ket = strchr(bra, '>');
56         if (!ket)
57                 return 0;
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 }
71 static int handle_from(char *in_line)
72 {
73         char line[1000];
74         char *at;
75         char *dst;
77         strcpy(line, in_line);
78         at = strchr(line, '@');
79         if (!at)
80                 return bogus_from(line);
82         /*
83          * If we already have one email, don't take any confusing lines
84          */
85         if (*email && strchr(at+1, '@'))
86                 return 0;
88         /* Pick up the string around '@', possibly delimited with <>
89          * pair; that is the email part.  White them out while copying.
90          */
91         while (at > line) {
92                 char c = at[-1];
93                 if (isspace(c))
94                         break;
95                 if (c == '<') {
96                         at[-1] = ' ';
97                         break;
98                 }
99                 at--;
100         }
101         dst = email;
102         for (;;) {
103                 unsigned char c = *at;
104                 if (!c || c == '>' || isspace(c)) {
105                         if (c == '>')
106                                 *at = ' ';
107                         break;
108                 }
109                 *at++ = ' ';
110                 *dst++ = c;
111         }
112         *dst++ = 0;
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          */
119         at = line + strlen(line);
120         while (at > line) {
121                 unsigned char c = *--at;
122                 if (!isspace(c)) {
123                         at[(c == ')') ? 0 : 1] = 0;
124                         break;
125                 }
126         }
128         at = line;
129         for (;;) {
130                 unsigned char c = *at;
131                 if (!c || !isspace(c)) {
132                         if (c == '(')
133                                 at++;
134                         break;
135                 }
136                 at++;
137         }
138         at = sanity_check(at, email);
139         strcpy(name, at);
140         return 1;
143 static int handle_header(char *line, char *data, int ofs)
145         if (!line || !data)
146                 return 1;
148         strcpy(data, line+ofs);
150         return 0;
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  */
159 static int slurp_attr(const char *line, const char *name, char *attr)
161         const char *ends, *ap = strcasestr(line, name);
162         size_t sz;
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;
181 struct content_type {
182         char *boundary;
183         int boundary_len;
184 };
186 static struct content_type content[MAX_BOUNDARIES];
188 static struct content_type *content_top = content;
190 static int handle_content_type(char *line)
192         char boundary[256];
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);
205         }
206         if (slurp_attr(line, "charset=", charset)) {
207                 int i, c;
208                 for (i = 0; (c = charset[i]) != 0; i++)
209                         charset[i] = tolower(c);
210         }
211         return 0;
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;
220         else
221                 transfer_encoding = TE_DONTCARE;
222         return 0;
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]))
234                 line[--len] = 0;
235         return len;
238 static char *cleanup_subject(char *subject)
240         if (keep_subject)
241                 return subject;
242         for (;;) {
243                 char *p;
244                 int len, remove;
245                 switch (*subject) {
246                 case 'r': case 'R':
247                         if (!memcmp("e:", subject+1, 2)) {
248                                 subject += 3;
249                                 continue;
250                         }
251                         break;
252                 case ' ': case '\t': case ':':
253                         subject++;
254                         continue;
256                 case '[':
257                         p = strchr(subject, ']');
258                         if (!p) {
259                                 subject++;
260                                 continue;
261                         }
262                         len = strlen(p);
263                         remove = p - subject;
264                         if (remove <= len *2) {
265                                 subject = p+1;
266                                 continue;
267                         }
268                         break;
269                 }
270                 eatspace(subject);
271                 return subject;
272         }
275 static void cleanup_space(char *buf)
277         unsigned char c;
278         while ((c = *buf) != 0) {
279                 buf++;
280                 if (isspace(c)) {
281                         buf[-1] = ' ';
282                         c = *buf;
283                         while (isspace(c)) {
284                                 int len = strlen(buf);
285                                 memmove(buf, buf+1, len);
286                                 c = *buf;
287                         }
288                 }
289         }
292 static void decode_header(char *it);
293 static char *header[MAX_HDR_PARSED] = {
294         "From","Subject","Date",
295 };
297 static int check_header(char *line, char **hdr_data, int overwrite)
299         int i;
301         /* search for the interesting parts */
302         for (i = 0; header[i]; i++) {
303                 int len = strlen(header[i]);
304                 if ((!hdr_data[i] || overwrite) &&
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.
309                          */
310                         decode_header(line + len + 2);
311                         hdr_data[i] = xmalloc(1000 * sizeof(char));
312                         if (! handle_header(line, hdr_data[i], len + 2)) {
313                                 return 1;
314                         }
315                 }
316         }
318         /* Content stuff */
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)) {
323                         return 1;
324                 }
325         }
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)) {
330                         return 1;
331                 }
332         }
334         /* for inbody stuff */
335         if (!memcmp(">From", line, 5) && isspace(line[5]))
336                 return 1;
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)) {
341                                         return 1;
342                                 }
343                         }
344                 }
345         }
347         /* no match */
348         return 0;
351 static int is_rfc2822_header(char *line)
353         /*
354          * The section that defines the loosest possible
355          * field name is "3.6.8 Optional fields".
356          *
357          * optional-field = field-name ":" unstructured CRLF
358          * field-name = 1*ftext
359          * ftext = %d33-57 / %59-126
360          */
361         int ch;
362         char *cp = line;
364         /* Count mbox From headers as headers */
365         if (!memcmp(line, "From ", 5) || !memcmp(line, ">From ", 6))
366                 return 1;
368         while ((ch = *cp++)) {
369                 if (ch == ':')
370                         return cp != line;
371                 if ((33 <= ch && ch <= 57) ||
372                     (59 <= ch && ch <= 126))
373                         continue;
374                 break;
375         }
376         return 0;
379 /*
380  * sz is size of 'line' buffer in bytes.  Must be reasonably
381  * long enough to hold one physical real-world e-mail line.
382  */
383 static int read_one_header_line(char *line, int sz, FILE *in)
385         int len;
387         /*
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.
391          */
392         sz--;
394         /* Get the first part of the line. */
395         if (!fgets(line, sz, in))
396                 return 0;
398         /*
399          * Is it an empty line or not a valid rfc2822 header?
400          * If so, stop here, and return false ("not a header")
401          */
402         len = eatspace(line);
403         if (!len || !is_rfc2822_header(line)) {
404                 /* Re-add the newline */
405                 line[len] = '\n';
406                 line[len + 1] = '\0';
407                 return 0;
408         }
410         /*
411          * Now we need to eat all the continuation lines..
412          * Yuck, 2822 header "folding"
413          */
414         for (;;) {
415                 int peek, addlen;
416                 static char continuation[1000];
418                 peek = fgetc(in); ungetc(peek, in);
419                 if (peek != ' ' && peek != '\t')
420                         break;
421                 if (!fgets(continuation, sizeof(continuation), in))
422                         break;
423                 addlen = eatspace(continuation);
424                 if (len < sz - 1) {
425                         if (addlen >= sz - len)
426                                 addlen = sz - len - 1;
427                         memcpy(line + len, continuation, addlen);
428                         len += addlen;
429                 }
430         }
431         line[len] = 0;
433         return 1;
436 static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
438         int c;
439         while ((c = *in++) != 0 && (in <= ep)) {
440                 if (c == '=') {
441                         int d = *in++;
442                         if (d == '\n' || !d)
443                                 break; /* drop trailing newline */
444                         *ot++ = ((hexval(d) << 4) | hexval(*in++));
445                         continue;
446                 }
447                 if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
448                         c = 0x20;
449                 *ot++ = c;
450         }
451         *ot = 0;
452         return 0;
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)) {
461                 if (c == '+')
462                         c = 62;
463                 else if (c == '/')
464                         c = 63;
465                 else if ('A' <= c && c <= 'Z')
466                         c -= 'A';
467                 else if ('a' <= c && c <= 'z')
468                         c -= 'a' - 26;
469                 else if ('0' <= c && c <= '9')
470                         c -= '0' - 52;
471                 else if (c == '=') {
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.
475                          */
476                         c = 0;
477                 }
478                 else
479                         continue; /* garbage */
480                 switch (pos++) {
481                 case 0:
482                         acc = (c << 2);
483                         break;
484                 case 1:
485                         *ot++ = (acc | (c >> 4));
486                         acc = (c & 15) << 4;
487                         break;
488                 case 2:
489                         *ot++ = (acc | (c >> 2));
490                         acc = (c & 3) << 6;
491                         break;
492                 case 3:
493                         *ot++ = (acc | c);
494                         acc = pos = 0;
495                         break;
496                 }
497         }
498         *ot = 0;
499         return 0;
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);
508         if (!out)
509                 die("cannot convert from %s to %s\n",
510                     input_charset, metainfo_charset);
511         strcpy(line, out);
512         free(out);
515 static int decode_header_bq(char *it)
517         char *in, *out, *ep, *cp, *sp;
518         char outbuf[1000];
519         int rfc2047 = 0;
521         in = it;
522         out = outbuf;
523         while ((ep = strstr(in, "=?")) != NULL) {
524                 int sz, encoding;
525                 char charset_q[256], piecebuf[256];
526                 rfc2047 = 1;
528                 if (in != ep) {
529                         sz = ep - in;
530                         memcpy(out, in, sz);
531                         out += sz;
532                         in += sz;
533                 }
534                 /* E.g.
535                  * ep : "=?iso-2022-jp?B?GyR...?= foo"
536                  * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
537                  */
538                 ep += 2;
539                 cp = strchr(ep, '?');
540                 if (!cp)
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;
545                 encoding = cp[1];
546                 if (!encoding || cp[2] != '?')
547                         return rfc2047; /* no munging */
548                 ep = strstr(cp + 3, "?=");
549                 if (!ep)
550                         return rfc2047; /* no munging */
551                 switch (tolower(encoding)) {
552                 default:
553                         return rfc2047; /* no munging */
554                 case 'b':
555                         sz = decode_b_segment(cp + 3, piecebuf, ep);
556                         break;
557                 case 'q':
558                         sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
559                         break;
560                 }
561                 if (sz < 0)
562                         return rfc2047;
563                 if (metainfo_charset)
564                         convert_to_utf8(piecebuf, charset_q);
565                 strcpy(out, piecebuf);
566                 out += strlen(out);
567                 in = ep + 2;
568         }
569         strcpy(out, in);
570         strcpy(it, outbuf);
571         return rfc2047;
574 static void decode_header(char *it)
577         if (decode_header_bq(it))
578                 return;
579         /* otherwise "it" is a straight copy of the input.
580          * This can be binary guck but there is no charset specified.
581          */
582         if (metainfo_charset)
583                 convert_to_utf8(it, "");
586 static void decode_transfer_encoding(char *line)
588         char *ep;
590         switch (transfer_encoding) {
591         case TE_QP:
592                 ep = line + strlen(line);
593                 decode_q_segment(line, line, ep, 0);
594                 break;
595         case TE_BASE64:
596                 ep = line + strlen(line);
597                 decode_b_segment(line, line, ep);
598                 break;
599         case TE_DONTCARE:
600                 break;
601         }
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))
610                         return 1;
611         }
612         return 0;
615 static int handle_boundary(void)
617         char newline[]="\n";
618 again:
619         if (!memcmp(line+content_top->boundary_len, "--", 2)) {
620                 /* we hit an end boundary */
621                 /* pop the current boundary off the stack */
622                 free(content_top->boundary);
624                 /* technically won't happen as is_multipart_boundary()
625                    will fail first.  But just in case..
626                  */
627                 if (content_top-- < content) {
628                         fprintf(stderr, "Detected mismatched boundaries, "
629                                         "can't recover\n");
630                         exit(1);
631                 }
632                 handle_filter(newline);
634                 /* skip to the next boundary */
635                 if (!find_boundary())
636                         return 0;
637                 goto again;
638         }
640         /* set some defaults */
641         transfer_encoding = TE_DONTCARE;
642         charset[0] = 0;
643         message_type = TYPE_TEXT;
645         /* slurp in this section's info */
646         while (read_one_header_line(line, sizeof(line), fin))
647                 check_header(line, p_hdr_data, 0);
649         /* eat the blank line after section info */
650         return (fgets(line, sizeof(line), fin) != NULL);
653 static inline int patchbreak(const char *line)
655         /* Beginning of a "diff -" header? */
656         if (!memcmp("diff -", line, 6))
657                 return 1;
659         /* CVS "Index: " line? */
660         if (!memcmp("Index: ", line, 7))
661                 return 1;
663         /*
664          * "--- <filename>" starts patches without headers
665          * "---<sp>*" is a manual separator
666          */
667         if (!memcmp("---", line, 3)) {
668                 line += 3;
669                 /* space followed by a filename? */
670                 if (line[0] == ' ' && !isspace(line[1]))
671                         return 1;
672                 /* Just whitespace? */
673                 for (;;) {
674                         unsigned char c = *line++;
675                         if (c == '\n')
676                                 return 1;
677                         if (!isspace(c))
678                                 break;
679                 }
680                 return 0;
681         }
682         return 0;
686 static int handle_commit_msg(char *line)
688         static int still_looking = 1;
690         if (!cmitmsg)
691                 return 0;
693         if (still_looking) {
694                 char *cp = line;
695                 if (isspace(*line)) {
696                         for (cp = line + 1; *cp; cp++) {
697                                 if (!isspace(*cp))
698                                         break;
699                         }
700                         if (!*cp)
701                                 return 0;
702                 }
703                 if ((still_looking = check_header(cp, s_hdr_data, 0)) != 0)
704                         return 0;
705         }
707         /* normalize the log message to UTF-8. */
708         if (metainfo_charset)
709                 convert_to_utf8(line, charset);
711         if (patchbreak(line)) {
712                 fclose(cmitmsg);
713                 cmitmsg = NULL;
714                 return 1;
715         }
717         fputs(line, cmitmsg);
718         return 0;
721 static int handle_patch(char *line)
723         fputs(line, patchfile);
724         patch_lines++;
725         return 0;
728 static int handle_filter(char *line)
730         static int filter = 0;
732         /* filter tells us which part we left off on
733          * a non-zero return indicates we hit a filter point
734          */
735         switch (filter) {
736         case 0:
737                 if (!handle_commit_msg(line))
738                         break;
739                 filter++;
740         case 1:
741                 if (!handle_patch(line))
742                         break;
743                 filter++;
744         default:
745                 return 1;
746         }
748         return 0;
751 static void handle_body(void)
753         int rc = 0;
754         static char newline[2000];
755         static char *np = newline;
757         /* Skip up to the first boundary */
758         if (content_top->boundary) {
759                 if (!find_boundary())
760                         return;
761         }
763         do {
764                 /* process any boundary lines */
765                 if (content_top->boundary && is_multipart_boundary(line)) {
766                         /* flush any leftover */
767                         if ((transfer_encoding == TE_BASE64)  &&
768                             (np != newline)) {
769                                 handle_filter(newline);
770                         }
771                         if (!handle_boundary())
772                                 return;
773                 }
775                 /* Unwrap transfer encoding */
776                 decode_transfer_encoding(line);
778                 switch (transfer_encoding) {
779                 case TE_BASE64:
780                 {
781                         char *op = line;
783                         /* binary data most likely doesn't have newlines */
784                         if (message_type != TYPE_TEXT) {
785                                 rc = handle_filter(line);
786                                 break;
787                         }
789                         /* this is a decoded line that may contain
790                          * multiple new lines.  Pass only one chunk
791                          * at a time to handle_filter()
792                          */
794                         do {
795                                 while (*op != '\n' && *op != 0)
796                                         *np++ = *op++;
797                                 *np = *op;
798                                 if (*np != 0) {
799                                         /* should be sitting on a new line */
800                                         *(++np) = 0;
801                                         op++;
802                                         rc = handle_filter(newline);
803                                         np = newline;
804                                 }
805                         } while (*op != 0);
806                         /* the partial chunk is saved in newline and
807                          * will be appended by the next iteration of fgets
808                          */
809                         break;
810                 }
811                 default:
812                         rc = handle_filter(line);
813                 }
814                 if (rc)
815                         /* nothing left to filter */
816                         break;
817         } while (fgets(line, sizeof(line), fin));
819         return;
822 static void handle_info(void)
824         char *sub;
825         char *hdr;
826         int i;
828         for (i = 0; header[i]; i++) {
830                 /* only print inbody headers if we output a patch file */
831                 if (patch_lines && s_hdr_data[i])
832                         hdr = s_hdr_data[i];
833                 else if (p_hdr_data[i])
834                         hdr = p_hdr_data[i];
835                 else
836                         continue;
838                 if (!memcmp(header[i], "Subject", 7)) {
839                         sub = cleanup_subject(hdr);
840                         cleanup_space(sub);
841                         fprintf(fout, "Subject: %s\n", sub);
842                 } else if (!memcmp(header[i], "From", 4)) {
843                         handle_from(hdr);
844                         fprintf(fout, "Author: %s\n", name);
845                         fprintf(fout, "Email: %s\n", email);
846                 } else {
847                         cleanup_space(hdr);
848                         fprintf(fout, "%s: %s\n", header[i], hdr);
849                 }
850         }
851         fprintf(fout, "\n");
854 int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
855              const char *msg, const char *patch)
857         keep_subject = ks;
858         metainfo_charset = encoding;
859         fin = in;
860         fout = out;
862         cmitmsg = fopen(msg, "w");
863         if (!cmitmsg) {
864                 perror(msg);
865                 return -1;
866         }
867         patchfile = fopen(patch, "w");
868         if (!patchfile) {
869                 perror(patch);
870                 fclose(cmitmsg);
871                 return -1;
872         }
874         p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
875         s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
877         /* process the email header */
878         while (read_one_header_line(line, sizeof(line), fin))
879                 check_header(line, p_hdr_data, 1);
881         handle_body();
882         handle_info();
884         return 0;
887 static const char mailinfo_usage[] =
888         "git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
890 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
892         const char *def_charset;
894         /* NEEDSWORK: might want to do the optional .git/ directory
895          * discovery
896          */
897         git_config(git_default_config);
899         def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
900         metainfo_charset = def_charset;
902         while (1 < argc && argv[1][0] == '-') {
903                 if (!strcmp(argv[1], "-k"))
904                         keep_subject = 1;
905                 else if (!strcmp(argv[1], "-u"))
906                         metainfo_charset = def_charset;
907                 else if (!strcmp(argv[1], "-n"))
908                         metainfo_charset = NULL;
909                 else if (!prefixcmp(argv[1], "--encoding="))
910                         metainfo_charset = argv[1] + 11;
911                 else
912                         usage(mailinfo_usage);
913                 argc--; argv++;
914         }
916         if (argc != 3)
917                 usage(mailinfo_usage);
919         return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);