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[emacs.git] / lib-src / fakemail.c
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1 /* sendmail-like interface to /bin/mail for system V,
2 Copyright (C) 1985, 1994, 1999 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* This is needed to get the declaration of cuserid in GNU libc. */
23 #define _XOPEN_SOURCE 1
25 #define NO_SHORTNAMES
26 #include <../src/config.h>
28 #if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
29 /* This program isnot used in BSD, so just avoid loader complaints. */
30 int
31 main ()
33 return 0;
35 #else /* not BSD 4.2 (or newer) */
36 #ifdef MSDOS
37 int
38 main ()
40 return 0;
42 #else /* not MSDOS */
43 /* This conditional contains all the rest of the file. */
45 /* These are defined in config in some versions. */
47 #ifdef static
48 #undef static
49 #endif
51 #ifdef WINDOWSNT
52 #include "ntlib.h"
53 #endif
55 #include <stdio.h>
56 #include <string.h>
57 #include <ctype.h>
58 #include <time.h>
59 #include <pwd.h>
61 /* This is to declare cuserid. */
62 #ifdef HAVE_UNISTD_H
63 #include <unistd.h>
64 #endif
66 /* Type definitions */
68 #define boolean int
69 #define true 1
70 #define false 0
72 /* Various lists */
74 struct line_record
76 char *string;
77 struct line_record *continuation;
79 typedef struct line_record *line_list;
81 struct header_record
83 line_list text;
84 struct header_record *next;
85 struct header_record *previous;
87 typedef struct header_record *header;
89 struct stream_record
91 FILE *handle;
92 int (*action)();
93 struct stream_record *rest_streams;
95 typedef struct stream_record *stream_list;
97 /* A `struct linebuffer' is a structure which holds a line of text.
98 * `readline' reads a line from a stream into a linebuffer
99 * and works regardless of the length of the line.
102 struct linebuffer
104 long size;
105 char *buffer;
108 struct linebuffer lb;
110 #define new_list() \
111 ((line_list) xmalloc (sizeof (struct line_record)))
112 #define new_header() \
113 ((header) xmalloc (sizeof (struct header_record)))
114 #define new_stream() \
115 ((stream_list) xmalloc (sizeof (struct stream_record)))
116 #define alloc_string(nchars) \
117 ((char *) xmalloc ((nchars) + 1))
119 /* Global declarations */
121 #define BUFLEN 1024
122 #define KEYWORD_SIZE 256
123 #define FROM_PREFIX "From"
124 #define MY_NAME "fakemail"
125 #define NIL ((line_list) NULL)
126 #define INITIAL_LINE_SIZE 200
128 #ifndef MAIL_PROGRAM_NAME
129 #define MAIL_PROGRAM_NAME "/bin/mail"
130 #endif
132 static char *my_name;
133 static char *the_date;
134 static char *the_user;
135 static line_list file_preface;
136 static stream_list the_streams;
137 static boolean no_problems = true;
139 extern FILE *popen ();
140 extern int fclose (), pclose ();
142 #ifdef CURRENT_USER
143 extern struct passwd *getpwuid ();
144 extern unsigned short geteuid ();
145 static struct passwd *my_entry;
146 #define cuserid(s) \
147 (my_entry = getpwuid (((int) geteuid ())), \
148 my_entry->pw_name)
149 #endif
151 /* Utilities */
153 /* Print error message. `s1' is printf control string, `s2' is arg for it. */
155 static void
156 error (s1, s2)
157 char *s1, *s2;
159 printf ("%s: ", my_name);
160 printf (s1, s2);
161 printf ("\n");
162 no_problems = false;
165 /* Print error message and exit. */
167 static void
168 fatal (s1, s2)
169 char *s1, *s2;
171 error (s1, s2);
172 exit (1);
175 /* Like malloc but get fatal error if memory is exhausted. */
177 static long *
178 xmalloc (size)
179 int size;
181 long *result = (long *) malloc (((unsigned) size));
182 if (result == ((long *) NULL))
183 fatal ("virtual memory exhausted", 0);
184 return result;
187 static long *
188 xrealloc (ptr, size)
189 long *ptr;
190 int size;
192 long *result = (long *) realloc (ptr, ((unsigned) size));
193 if (result == ((long *) NULL))
194 fatal ("virtual memory exhausted");
195 return result;
198 /* Initialize a linebuffer for use */
200 void
201 init_linebuffer (linebuffer)
202 struct linebuffer *linebuffer;
204 linebuffer->size = INITIAL_LINE_SIZE;
205 linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
208 /* Read a line of text from `stream' into `linebuffer'.
209 * Return the length of the line.
212 long
213 readline (linebuffer, stream)
214 struct linebuffer *linebuffer;
215 FILE *stream;
217 char *buffer = linebuffer->buffer;
218 char *p = linebuffer->buffer;
219 char *end = p + linebuffer->size;
221 while (true)
223 int c = getc (stream);
224 if (p == end)
226 linebuffer->size *= 2;
227 buffer = ((char *) xrealloc (buffer, linebuffer->size));
228 p = buffer + (p - linebuffer->buffer);
229 end = buffer + linebuffer->size;
230 linebuffer->buffer = buffer;
232 if (c < 0 || c == '\n')
234 *p = 0;
235 break;
237 *p++ = c;
240 return p - buffer;
243 /* Extract a colon-terminated keyword from the string FIELD.
244 Return that keyword as a string stored in a static buffer.
245 Store the address of the rest of the string into *REST.
247 If there is no keyword, return NULL and don't alter *REST. */
249 char *
250 get_keyword (field, rest)
251 register char *field;
252 char **rest;
254 static char keyword[KEYWORD_SIZE];
255 register char *ptr;
256 register char c;
258 ptr = &keyword[0];
259 c = *field++;
260 if (isspace (c) || c == ':')
261 return ((char *) NULL);
262 *ptr++ = (islower (c) ? toupper (c) : c);
263 while (((c = *field++) != ':') && ! isspace (c))
264 *ptr++ = (islower (c) ? toupper (c) : c);
265 *ptr++ = '\0';
266 while (isspace (c))
267 c = *field++;
268 if (c != ':')
269 return ((char *) NULL);
270 *rest = field;
271 return &keyword[0];
274 /* Nonzero if the string FIELD starts with a colon-terminated keyword. */
276 boolean
277 has_keyword (field)
278 char *field;
280 char *ignored;
281 return (get_keyword (field, &ignored) != ((char *) NULL));
284 /* Store the string FIELD, followed by any lines in THE_LIST,
285 into the buffer WHERE.
286 Concatenate lines, putting just a space between them.
287 Delete everything contained in parentheses.
288 When a recipient name contains <...>, we discard
289 everything except what is inside the <...>.
291 We don't pay attention to overflowing WHERE;
292 the caller has to make it big enough. */
294 char *
295 add_field (the_list, field, where)
296 line_list the_list;
297 register char *field, *where;
299 register char c;
300 while (true)
302 char *this_recipient_where;
303 int in_quotes = 0;
305 *where++ = ' ';
306 this_recipient_where = where;
308 while ((c = *field++) != '\0')
310 if (c == '\\')
311 *where++ = c;
312 else if (c == '"')
314 in_quotes = ! in_quotes;
315 *where++ = c;
317 else if (in_quotes)
318 *where++ = c;
319 else if (c == '(')
321 while (*field && *field != ')') ++field;
322 if (! (*field++)) break; /* no close */
323 continue;
325 else if (c == ',')
327 *where++ = ' ';
328 /* When we get to the end of one recipient,
329 don't discard it if the next one has <...>. */
330 this_recipient_where = where;
332 else if (c == '<')
333 /* Discard everything we got before the `<'. */
334 where = this_recipient_where;
335 else if (c == '>')
336 /* Discard the rest of this name that follows the `>'. */
338 while (*field && *field != ',') ++field;
339 if (! (*field++)) break; /* no comma */
340 continue;
342 else
343 *where++ = c;
345 if (the_list == NIL) break;
346 field = the_list->string;
347 the_list = the_list->continuation;
349 return where;
352 line_list
353 make_file_preface ()
355 char *the_string, *temp;
356 long idiotic_interface;
357 long prefix_length;
358 long user_length;
359 long date_length;
360 line_list result;
362 prefix_length = strlen (FROM_PREFIX);
363 time (&idiotic_interface);
364 the_date = ctime (&idiotic_interface);
365 /* the_date has an unwanted newline at the end */
366 date_length = strlen (the_date) - 1;
367 the_date[date_length] = '\0';
368 temp = cuserid ((char *) NULL);
369 user_length = strlen (temp);
370 the_user = alloc_string (user_length + 1);
371 strcpy (the_user, temp);
372 the_string = alloc_string (3 + prefix_length
373 + user_length
374 + date_length);
375 temp = the_string;
376 strcpy (temp, FROM_PREFIX);
377 temp = &temp[prefix_length];
378 *temp++ = ' ';
379 strcpy (temp, the_user);
380 temp = &temp[user_length];
381 *temp++ = ' ';
382 strcpy (temp, the_date);
383 result = new_list ();
384 result->string = the_string;
385 result->continuation = ((line_list) NULL);
386 return result;
389 void
390 write_line_list (the_list, the_stream)
391 register line_list the_list;
392 FILE *the_stream;
394 for ( ;
395 the_list != ((line_list) NULL) ;
396 the_list = the_list->continuation)
398 fputs (the_list->string, the_stream);
399 putc ('\n', the_stream);
401 return;
405 close_the_streams ()
407 register stream_list rem;
408 for (rem = the_streams;
409 rem != ((stream_list) NULL);
410 rem = rem->rest_streams)
411 no_problems = (no_problems &&
412 ((*rem->action) (rem->handle) == 0));
413 the_streams = ((stream_list) NULL);
414 return (no_problems ? 0 : 1);
417 void
418 add_a_stream (the_stream, closing_action)
419 FILE *the_stream;
420 int (*closing_action)();
422 stream_list old = the_streams;
423 the_streams = new_stream ();
424 the_streams->handle = the_stream;
425 the_streams->action = closing_action;
426 the_streams->rest_streams = old;
427 return;
431 my_fclose (the_file)
432 FILE *the_file;
434 putc ('\n', the_file);
435 fflush (the_file);
436 return fclose (the_file);
439 boolean
440 open_a_file (name)
441 char *name;
443 FILE *the_stream = fopen (name, "a");
444 if (the_stream != ((FILE *) NULL))
446 add_a_stream (the_stream, my_fclose);
447 if (the_user == ((char *) NULL))
448 file_preface = make_file_preface ();
449 write_line_list (file_preface, the_stream);
450 return true;
452 return false;
455 void
456 put_string (s)
457 char *s;
459 register stream_list rem;
460 for (rem = the_streams;
461 rem != ((stream_list) NULL);
462 rem = rem->rest_streams)
463 fputs (s, rem->handle);
464 return;
467 void
468 put_line (string)
469 char *string;
471 register stream_list rem;
472 for (rem = the_streams;
473 rem != ((stream_list) NULL);
474 rem = rem->rest_streams)
476 char *s = string;
477 int column = 0;
479 /* Divide STRING into lines. */
480 while (*s != 0)
482 char *breakpos;
484 /* Find the last char that fits. */
485 for (breakpos = s; *breakpos && column < 78; ++breakpos)
487 if (*breakpos == '\t')
488 column += 8;
489 else
490 column++;
492 /* If we didn't reach end of line, break the line. */
493 if (*breakpos)
495 /* Back up to just after the last comma that fits. */
496 while (breakpos != s && breakpos[-1] != ',') --breakpos;
498 if (breakpos == s)
500 /* If no comma fits, move past the first address anyway. */
501 while (*breakpos != 0 && *breakpos != ',') ++breakpos;
502 if (*breakpos != 0)
503 /* Include the comma after it. */
504 ++breakpos;
507 /* Output that much, then break the line. */
508 fwrite (s, 1, breakpos - s, rem->handle);
509 column = 8;
511 /* Skip whitespace and prepare to print more addresses. */
512 s = breakpos;
513 while (*s == ' ' || *s == '\t') ++s;
514 if (*s != 0)
515 fputs ("\n\t", rem->handle);
517 putc ('\n', rem->handle);
519 return;
522 #define mail_error error
524 /* Handle an FCC field. FIELD is the text of the first line (after
525 the header name), and THE_LIST holds the continuation lines if any.
526 Call open_a_file for each file. */
528 void
529 setup_files (the_list, field)
530 register line_list the_list;
531 register char *field;
533 register char *start;
534 register char c;
535 while (true)
537 while (((c = *field) != '\0')
538 && (c == ' '
539 || c == '\t'
540 || c == ','))
541 field += 1;
542 if (c != '\0')
544 start = field;
545 while (((c = *field) != '\0')
546 && c != ' '
547 && c != '\t'
548 && c != ',')
549 field += 1;
550 *field = '\0';
551 if (!open_a_file (start))
552 mail_error ("Could not open file %s", start);
553 *field = c;
554 if (c != '\0') continue;
556 if (the_list == ((line_list) NULL))
557 return;
558 field = the_list->string;
559 the_list = the_list->continuation;
563 /* Compute the total size of all recipient names stored in THE_HEADER.
564 The result says how big to make the buffer to pass to parse_header. */
567 args_size (the_header)
568 header the_header;
570 register header old = the_header;
571 register line_list rem;
572 register int size = 0;
575 char *field;
576 register char *keyword = get_keyword (the_header->text->string, &field);
577 if ((strcmp (keyword, "TO") == 0)
578 || (strcmp (keyword, "CC") == 0)
579 || (strcmp (keyword, "BCC") == 0))
581 size += 1 + strlen (field);
582 for (rem = the_header->text->continuation;
583 rem != NIL;
584 rem = rem->continuation)
585 size += 1 + strlen (rem->string);
587 the_header = the_header->next;
588 } while (the_header != old);
589 return size;
592 /* Scan the header described by the lists THE_HEADER,
593 and put all recipient names into the buffer WHERE.
594 Precede each recipient name with a space.
596 Also, if the header has any FCC fields, call setup_files for each one. */
598 void
599 parse_header (the_header, where)
600 header the_header;
601 register char *where;
603 register header old = the_header;
606 char *field;
607 register char *keyword = get_keyword (the_header->text->string, &field);
608 if (strcmp (keyword, "TO") == 0)
609 where = add_field (the_header->text->continuation, field, where);
610 else if (strcmp (keyword, "CC") == 0)
611 where = add_field (the_header->text->continuation, field, where);
612 else if (strcmp (keyword, "BCC") == 0)
614 where = add_field (the_header->text->continuation, field, where);
615 the_header->previous->next = the_header->next;
616 the_header->next->previous = the_header->previous;
618 else if (strcmp (keyword, "FCC") == 0)
619 setup_files (the_header->text->continuation, field);
620 the_header = the_header->next;
621 } while (the_header != old);
622 *where = '\0';
623 return;
626 /* Read lines from the input until we get a blank line.
627 Create a list of `header' objects, one for each header field,
628 each of which points to a list of `line_list' objects,
629 one for each line in that field.
630 Continuation lines are grouped in the headers they continue. */
632 header
633 read_header ()
635 register header the_header = ((header) NULL);
636 register line_list *next_line = ((line_list *) NULL);
638 init_linebuffer (&lb);
642 long length;
643 register char *line;
645 readline (&lb, stdin);
646 line = lb.buffer;
647 length = strlen (line);
648 if (length == 0) break;
650 if (has_keyword (line))
652 register header old = the_header;
653 the_header = new_header ();
654 if (old == ((header) NULL))
656 the_header->next = the_header;
657 the_header->previous = the_header;
659 else
661 the_header->previous = old;
662 the_header->next = old->next;
663 old->next = the_header;
665 next_line = &(the_header->text);
668 if (next_line == ((line_list *) NULL))
670 /* Not a valid header */
671 exit (1);
673 *next_line = new_list ();
674 (*next_line)->string = alloc_string (length);
675 strcpy (((*next_line)->string), line);
676 next_line = &((*next_line)->continuation);
677 *next_line = NIL;
679 } while (true);
681 return the_header->next;
684 void
685 write_header (the_header)
686 header the_header;
688 register header old = the_header;
691 register line_list the_list;
692 for (the_list = the_header->text;
693 the_list != NIL;
694 the_list = the_list->continuation)
695 put_line (the_list->string);
696 the_header = the_header->next;
697 } while (the_header != old);
698 put_line ("");
699 return;
703 main (argc, argv)
704 int argc;
705 char **argv;
707 char *command_line;
708 header the_header;
709 long name_length;
710 char *mail_program_name;
711 char buf[BUFLEN + 1];
712 register int size;
713 FILE *the_pipe;
715 extern char *getenv ();
717 mail_program_name = getenv ("FAKEMAILER");
718 if (!(mail_program_name && *mail_program_name))
719 mail_program_name = MAIL_PROGRAM_NAME;
720 name_length = strlen (mail_program_name);
722 my_name = MY_NAME;
723 the_streams = ((stream_list) NULL);
724 the_date = ((char *) NULL);
725 the_user = ((char *) NULL);
727 the_header = read_header ();
728 command_line = alloc_string (name_length + args_size (the_header));
729 strcpy (command_line, mail_program_name);
730 parse_header (the_header, &command_line[name_length]);
732 the_pipe = popen (command_line, "w");
733 if (the_pipe == ((FILE *) NULL))
734 fatal ("cannot open pipe to real mailer");
736 add_a_stream (the_pipe, pclose);
738 write_header (the_header);
740 /* Dump the message itself */
742 while (!feof (stdin))
744 size = fread (buf, 1, BUFLEN, stdin);
745 buf[size] = '\0';
746 put_string (buf);
749 exit (close_the_streams ());
752 #endif /* not MSDOS */
753 #endif /* not BSD 4.2 (or newer) */