Raise WARNS to 6:
[dragonfly.git] / usr.bin / msgs / msgs.c
1 /*-
2  * Copyright (c) 1980, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by the University of
16  *      California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
34  * @(#)msgs.c   8.2 (Berkeley) 4/28/95
35  * $FreeBSD: src/usr.bin/msgs/msgs.c,v 1.15.2.2 2003/02/11 21:31:56 mike Exp $
36  * $DragonFly: src/usr.bin/msgs/msgs.c,v 1.4 2005/02/02 06:39:09 cpressey Exp $
37  */
38
39 /*
40  * msgs - a user bulletin board program
41  *
42  * usage:
43  *      msgs [fhlopq] [[-]number]       to read messages
44  *      msgs -s                         to place messages
45  *      msgs -c [-days]                 to clean up the bulletin board
46  *
47  * prompt commands are:
48  *      y       print message
49  *      n       flush message, go to next message
50  *      q       flush message, quit
51  *      p       print message, turn on 'pipe thru more' mode
52  *      P       print message, turn off 'pipe thru more' mode
53  *      -       reprint last message
54  *      s[-][<num>] [<filename>]        save message
55  *      m[-][<num>]     mail with message in temp mbox
56  *      x       exit without flushing this message
57  *      <num>   print message number <num>
58  */
59
60 #define V7              /* will look for TERM in the environment */
61 #define OBJECT          /* will object to messages without Subjects */
62 /* #define REJECT */    /* will reject messages without Subjects
63                            (OBJECT must be defined also) */
64 /* #define UNBUFFERED *//* use unbuffered output */
65
66 #include <sys/param.h>
67 #include <sys/stat.h>
68 #include <ctype.h>
69 #include <dirent.h>
70 #include <err.h>
71 #include <errno.h>
72 #include <fcntl.h>
73 #include <locale.h>
74 #include <pwd.h>
75 #include <setjmp.h>
76 #include <termcap.h>
77 #include <termios.h>
78 #include <signal.h>
79 #include <stdio.h>
80 #include <stdlib.h>
81 #include <string.h>
82 #include <time.h>
83 #include <unistd.h>
84 #include "pathnames.h"
85
86 #define CMODE   0644            /* bounds file creation mode */
87 #define NO      0
88 #define YES     1
89 #define SUPERUSER       0       /* superuser uid */
90 #define DAEMON          1       /* daemon uid */
91 #define NLINES  24              /* default number of lines/crt screen */
92 #define NDAYS   21              /* default keep time for messages */
93 #define DAYS    *24*60*60       /* seconds/day */
94 #define MSGSRC  ".msgsrc"       /* user's rc file */
95 #define BOUNDS  "bounds"        /* message bounds file */
96 #define NEXT    "Next message? [yq]"
97 #define MORE    "More? [ynq]"
98 #define NOMORE  "(No more) [q] ?"
99
100 typedef char    bool;
101
102 FILE    *msgsrc;
103 FILE    *newmsg;
104 const char *sep = "-";
105 char    inbuf[BUFSIZ];
106 char    fname[MAXPATHLEN];
107 char    cmdbuf[MAXPATHLEN + MAXPATHLEN];
108 char    subj[128];
109 char    from[128];
110 char    date[128];
111 char    *ptr;
112 char    *in;
113 bool    local;
114 bool    ruptible;
115 bool    totty;
116 bool    seenfrom;
117 bool    seensubj;
118 bool    blankline;
119 bool    printing = NO;
120 bool    mailing = NO;
121 bool    quitit = NO;
122 bool    sending = NO;
123 bool    intrpflg = NO;
124 int     uid;
125 int     msg;
126 int     prevmsg;
127 int     lct;
128 int     nlines;
129 int     Lpp = 0;
130 time_t  t;
131 time_t  keep;
132
133 /* option initialization */
134 bool    hdrs = NO;
135 bool    qopt = NO;
136 bool    hush = NO;
137 bool    send_msg = NO;
138 bool    locomode = NO;
139 bool    use_pager = NO;
140 bool    clean = NO;
141 bool    lastcmd = NO;
142 jmp_buf tstpbuf;
143
144
145 void ask(const char *);
146 void gfrsub(FILE *);
147 int linecnt(FILE *);
148 int next(char *);
149 char *nxtfld(unsigned char *);
150 void onsusp(int);
151 void onintr(int);
152 void prmesg(int);
153 static void usage(void);
154
155 int
156 main(int argc, char **argv)
157 {
158         bool newrc, already;
159         int rcfirst = 0;                /* first message to print (from .rc) */
160         int rcback = 0;                 /* amount to back off of rcfirst */
161         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
162         int blast = 0;
163         struct stat buf;                /* stat to check access of bounds */
164         FILE *bounds;
165
166 #ifdef UNBUFFERED
167         setbuf(stdout, NULL);
168 #endif
169         setlocale(LC_ALL, "");
170
171         time(&t);
172         setuid(uid = getuid());
173         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
174         if (ruptible)
175                 signal(SIGINT, SIG_DFL);
176
177         argc--, argv++;
178         while (argc > 0) {
179                 if (isdigit(argv[0][0])) {      /* starting message # */
180                         rcfirst = atoi(argv[0]);
181                 }
182                 else if (isdigit(argv[0][1])) { /* backward offset */
183                         rcback = atoi( &( argv[0][1] ) );
184                 }
185                 else {
186                         ptr = *argv;
187                         while (*ptr) switch (*ptr++) {
188
189                         case '-':
190                                 break;
191
192                         case 'c':
193                                 if (uid != SUPERUSER && uid != DAEMON) {
194                                         fprintf(stderr, "Sorry\n");
195                                         exit(1);
196                                 }
197                                 clean = YES;
198                                 break;
199
200                         case 'f':               /* silently */
201                                 hush = YES;
202                                 break;
203
204                         case 'h':               /* headers only */
205                                 hdrs = YES;
206                                 break;
207
208                         case 'l':               /* local msgs only */
209                                 locomode = YES;
210                                 break;
211
212                         case 'o':               /* option to save last message */
213                                 lastcmd = YES;
214                                 break;
215
216                         case 'p':               /* pipe thru 'more' during long msgs */
217                                 use_pager = YES;
218                                 break;
219
220                         case 'q':               /* query only */
221                                 qopt = YES;
222                                 break;
223
224                         case 's':               /* sending TO msgs */
225                                 send_msg = YES;
226                                 break;
227
228                         default:
229                                 usage();
230                         }
231                 }
232                 argc--, argv++;
233         }
234
235         /*
236          * determine current message bounds
237          */
238         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
239
240         /*
241          * Test access rights to the bounds file
242          * This can be a little tricky.  if(send_msg), then
243          * we will create it.  We assume that if(send_msg),     
244          * then you have write permission there.
245          * Else, it better be there, or we bail.
246          */
247         if (send_msg != YES) {
248                 if (stat(fname, &buf) < 0) {
249                         if (hush != YES) {
250                                 err(errno, "%s", fname);
251                         } else {
252                                 exit(1);
253                         }
254                 }
255         }
256         bounds = fopen(fname, "r");
257
258         if (bounds != NULL) {
259                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
260                 fclose(bounds);
261                 blast = lastmsg;        /* save upper bound */
262         }
263
264         if (clean)
265                 keep = t - (rcback? rcback : NDAYS) DAYS;
266
267         if (clean || bounds == NULL) {  /* relocate message bounds */
268                 struct dirent *dp;
269                 struct stat stbuf;
270                 bool seenany = NO;
271                 DIR     *dirp;
272
273                 dirp = opendir(_PATH_MSGS);
274                 if (dirp == NULL)
275                         err(errno, "%s", _PATH_MSGS);
276
277                 firstmsg = 32767;
278                 lastmsg = 0;
279
280                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
281                         register char *cp = dp->d_name;
282                         register int i = 0;
283
284                         if (dp->d_ino == 0)
285                                 continue;
286                         if (dp->d_namlen == 0)
287                                 continue;
288
289                         if (clean)
290                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
291
292                         while (isdigit(*cp))
293                                 i = i * 10 + *cp++ - '0';
294                         if (*cp)
295                                 continue;       /* not a message! */
296
297                         if (clean) {
298                                 if (stat(inbuf, &stbuf) != 0)
299                                         continue;
300                                 if (stbuf.st_mtime < keep
301                                     && stbuf.st_mode&S_IWRITE) {
302                                         unlink(inbuf);
303                                         continue;
304                                 }
305                         }
306
307                         if (i > lastmsg)
308                                 lastmsg = i;
309                         if (i < firstmsg)
310                                 firstmsg = i;
311                         seenany = YES;
312                 }
313                 closedir(dirp);
314
315                 if (!seenany) {
316                         if (blast != 0) /* never lower the upper bound! */
317                                 lastmsg = blast;
318                         firstmsg = lastmsg + 1;
319                 }
320                 else if (blast > lastmsg)
321                         lastmsg = blast;
322
323                 if (!send_msg) {
324                         bounds = fopen(fname, "w");
325                         if (bounds == NULL)
326                                 err(errno, "%s", fname);
327                         chmod(fname, CMODE);
328                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
329                         fclose(bounds);
330                 }
331         }
332
333         if (send_msg) {
334                 /*
335                  * Send mode - place msgs in _PATH_MSGS
336                  */
337                 bounds = fopen(fname, "w");
338                 if (bounds == NULL)
339                         err(errno, "%s", fname);
340
341                 nextmsg = lastmsg + 1;
342                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
343                 newmsg = fopen(fname, "w");
344                 if (newmsg == NULL)
345                         err(errno, "%s", fname);
346                 chmod(fname, CMODE);
347
348                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
349                 fclose(bounds);
350
351                 sending = YES;
352                 if (ruptible)
353                         signal(SIGINT, onintr);
354
355                 if (isatty(fileno(stdin))) {
356                         ptr = getpwuid(uid)->pw_name;
357                         printf("Message %d:\nFrom %s %sSubject: ",
358                                 nextmsg, ptr, ctime(&t));
359                         fflush(stdout);
360                         fgets(inbuf, sizeof inbuf, stdin);
361                         putchar('\n');
362                         fflush(stdout);
363                         fprintf(newmsg, "From %s %sSubject: %s\n",
364                                 ptr, ctime(&t), inbuf);
365                         blankline = seensubj = YES;
366                 }
367                 else
368                         blankline = seensubj = NO;
369                 for (;;) {
370                         fgets(inbuf, sizeof inbuf, stdin);
371                         if (feof(stdin) || ferror(stdin))
372                                 break;
373                         blankline = (blankline || (inbuf[0] == '\n'));
374                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
375                         fputs(inbuf, newmsg);
376                 }
377 #ifdef OBJECT
378                 if (!seensubj) {
379                         printf("NOTICE: Messages should have a Subject field!\n");
380 #ifdef REJECT
381                         unlink(fname);
382 #endif
383                         exit(1);
384                 }
385 #endif
386                 exit(ferror(stdin));
387         }
388         if (clean)
389                 exit(0);
390
391         /*
392          * prepare to display messages
393          */
394         totty = (isatty(fileno(stdout)) != 0);
395         use_pager = use_pager && totty;
396
397         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
398         msgsrc = fopen(fname, "r");
399         if (msgsrc) {
400                 newrc = NO;
401                 fscanf(msgsrc, "%d\n", &nextmsg);
402                 fclose(msgsrc);
403                 if (nextmsg > lastmsg+1) {
404                         printf("Warning: bounds have been reset (%d, %d)\n",
405                                 firstmsg, lastmsg);
406                         truncate(fname, (off_t)0);
407                         newrc = YES;
408                 }
409                 else if (!rcfirst)
410                         rcfirst = nextmsg - rcback;
411         }
412         else
413                 newrc = YES;
414         msgsrc = fopen(fname, "r+");
415         if (msgsrc == NULL)
416                 msgsrc = fopen(fname, "w");
417         if (msgsrc == NULL)
418                 err(errno, "%s", fname);
419         if (rcfirst) {
420                 if (rcfirst > lastmsg+1) {
421                         printf("Warning: the last message is number %d.\n",
422                                 lastmsg);
423                         rcfirst = nextmsg;
424                 }
425                 if (rcfirst > firstmsg)
426                         firstmsg = rcfirst;     /* don't set below first msg */
427         }
428         if (newrc) {
429                 nextmsg = firstmsg;
430                 fseek(msgsrc, 0L, 0);
431                 fprintf(msgsrc, "%d\n", nextmsg);
432                 fflush(msgsrc);
433         }
434
435 #ifdef V7
436         if (totty) {
437                 struct winsize win;
438                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
439                         Lpp = win.ws_row;
440                 if (Lpp <= 0) {
441                         if (tgetent(inbuf, getenv("TERM")) <= 0
442                             || (Lpp = tgetnum("li")) <= 0) {
443                                 Lpp = NLINES;
444                         }
445                 }
446         }
447 #endif
448         Lpp -= 6;       /* for headers, etc. */
449
450         already = NO;
451         prevmsg = firstmsg;
452         printing = YES;
453         if (ruptible)
454                 signal(SIGINT, onintr);
455
456         /*
457          * Main program loop
458          */
459         for (msg = firstmsg; msg <= lastmsg; msg++) {
460
461                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
462                 newmsg = fopen(fname, "r");
463                 if (newmsg == NULL)
464                         continue;
465
466                 gfrsub(newmsg);         /* get From and Subject fields */
467                 if (locomode && !local) {
468                         fclose(newmsg);
469                         continue;
470                 }
471
472                 if (qopt) {     /* This has to be located here */
473                         printf("There are new messages.\n");
474                         exit(0);
475                 }
476
477                 if (already && !hdrs)
478                         putchar('\n');
479
480                 /*
481                  * Print header
482                  */
483                 if (totty)
484                         signal(SIGTSTP, onsusp);
485                 (void) setjmp(tstpbuf);
486                 already = YES;
487                 nlines = 2;
488                 if (seenfrom) {
489                         printf("Message %d:\nFrom %s %s", msg, from, date);
490                         nlines++;
491                 }
492                 if (seensubj) {
493                         printf("Subject: %s", subj);
494                         nlines++;
495                 }
496                 else {
497                         if (seenfrom) {
498                                 putchar('\n');
499                                 nlines++;
500                         }
501                         while (nlines < 6
502                             && fgets(inbuf, sizeof inbuf, newmsg)
503                             && inbuf[0] != '\n') {
504                                 fputs(inbuf, stdout);
505                                 nlines++;
506                         }
507                 }
508
509                 lct = linecnt(newmsg);
510                 if (lct)
511                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
512                             (lct == 1) ? "" : "s");
513
514                 if (hdrs) {
515                         printf("\n-----\n");
516                         fclose(newmsg);
517                         continue;
518                 }
519
520                 /*
521                  * Ask user for command
522                  */
523                 if (totty)
524                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
525                 else
526                         inbuf[0] = 'y';
527                 if (totty)
528                         signal(SIGTSTP, SIG_DFL);
529 cmnd:
530                 in = inbuf;
531                 switch (*in) {
532                         case 'x':
533                         case 'X':
534                                 exit(0);
535
536                         case 'q':
537                         case 'Q':
538                                 quitit = YES;
539                                 printf("--Postponed--\n");
540                                 exit(0);
541                                 /* intentional fall-thru */
542                         case 'n':
543                         case 'N':
544                                 if (msg >= nextmsg) sep = "Flushed";
545                                 prevmsg = msg;
546                                 break;
547
548                         case 'p':
549                         case 'P':
550                                 use_pager = (*in++ == 'p');
551                                 /* intentional fallthru */
552                         case '\n':
553                         case 'y':
554                         default:
555                                 if (*in == '-') {
556                                         msg = prevmsg-1;
557                                         sep = "replay";
558                                         break;
559                                 }
560                                 if (isdigit(*in)) {
561                                         msg = next(in);
562                                         sep = in;
563                                         break;
564                                 }
565
566                                 prmesg(nlines + lct + (seensubj? 1 : 0));
567                                 prevmsg = msg;
568
569                 }
570
571                 printf("--%s--\n", sep);
572                 sep = "-";
573                 if (msg >= nextmsg) {
574                         nextmsg = msg + 1;
575                         fseek(msgsrc, 0L, 0);
576                         fprintf(msgsrc, "%d\n", nextmsg);
577                         fflush(msgsrc);
578                 }
579                 if (newmsg)
580                         fclose(newmsg);
581                 if (quitit)
582                         break;
583         }
584
585         /*
586          * Make sure .rc file gets updated
587          */
588         if (--msg >= nextmsg) {
589                 nextmsg = msg + 1;
590                 fseek(msgsrc, 0L, 0);
591                 fprintf(msgsrc, "%d\n", nextmsg);
592                 fflush(msgsrc);
593         }
594         if (already && !quitit && lastcmd && totty) {
595                 /*
596                  * save or reply to last message?
597                  */
598                 msg = prevmsg;
599                 ask(NOMORE);
600                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
601                         goto cmnd;
602         }
603         if (!(already || hush || qopt))
604                 printf("No new messages.\n");
605         exit(0);
606 }
607
608 static void
609 usage(void)
610 {
611         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
612         exit(1);
613 }
614
615 void
616 prmesg(int length)
617 {
618         FILE *outf;
619         char *env_pager;
620
621         if (use_pager && length > Lpp) {
622                 signal(SIGPIPE, SIG_IGN);
623                 signal(SIGQUIT, SIG_IGN);
624                 if ((env_pager = getenv("PAGER")) == NULL) {
625                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
626                 } else {
627                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
628                 }
629                 outf = popen(cmdbuf, "w");
630                 if (!outf)
631                         outf = stdout;
632                 else
633                         setbuf(outf, (char *)NULL);
634         }
635         else
636                 outf = stdout;
637
638         if (seensubj)
639                 putc('\n', outf);
640
641         while (fgets(inbuf, sizeof inbuf, newmsg)) {
642                 fputs(inbuf, outf);
643                 if (ferror(outf)) {
644                         clearerr(outf);
645                         break;
646                 }
647         }
648
649         if (outf != stdout) {
650                 pclose(outf);
651                 signal(SIGPIPE, SIG_DFL);
652                 signal(SIGQUIT, SIG_DFL);
653         }
654         else {
655                 fflush(stdout);
656         }
657
658         /* force wait on output */
659         tcdrain(fileno(stdout));
660 }
661
662 void
663 onintr(int unused __unused)
664 {
665         signal(SIGINT, onintr);
666         if (mailing)
667                 unlink(fname);
668         if (sending) {
669                 unlink(fname);
670                 puts("--Killed--");
671                 exit(1);
672         }
673         if (printing) {
674                 putchar('\n');
675                 if (hdrs)
676                         exit(0);
677                 sep = "Interrupt";
678                 if (newmsg)
679                         fseek(newmsg, 0L, 2);
680                 intrpflg = YES;
681         }
682 }
683
684 /*
685  * We have just gotten a susp.  Suspend and prepare to resume.
686  */
687 void
688 onsusp(int unused __unused)
689 {
690         signal(SIGTSTP, SIG_DFL);
691         sigsetmask(0);
692         kill(0, SIGTSTP);
693         signal(SIGTSTP, onsusp);
694         if (!mailing)
695                 longjmp(tstpbuf, 0);
696 }
697
698 int
699 linecnt(FILE *f)
700 {
701         off_t oldpos = ftell(f);
702         int l = 0;
703         char lbuf[BUFSIZ];
704
705         while (fgets(lbuf, sizeof lbuf, f))
706                 l++;
707         clearerr(f);
708         fseek(f, oldpos, 0);
709         return (l);
710 }
711
712 int
713 next(char *buf)
714 {
715         int i;
716         sscanf(buf, "%d", &i);
717         sprintf(buf, "Goto %d", i);
718         return(--i);
719 }
720
721 void
722 ask(const char *prompt)
723 {
724         char    inch;
725         int     n, cmsg, fd;
726         off_t   oldpos;
727         FILE    *cpfrom, *cpto;
728
729         printf("%s ", prompt);
730         fflush(stdout);
731         intrpflg = NO;
732         (void) fgets(inbuf, sizeof inbuf, stdin);
733         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
734                 inbuf[n - 1] = '\0';
735         if (intrpflg)
736                 inbuf[0] = 'x';
737
738         /*
739          * Handle 'mail' and 'save' here.
740          */
741         if ((inch = inbuf[0]) == 's' || inch == 'm') {
742                 if (inbuf[1] == '-')
743                         cmsg = prevmsg;
744                 else if (isdigit(inbuf[1]))
745                         cmsg = atoi(&inbuf[1]);
746                 else
747                         cmsg = msg;
748                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
749
750                 oldpos = ftell(newmsg);
751
752                 cpfrom = fopen(fname, "r");
753                 if (!cpfrom) {
754                         printf("Message %d not found\n", cmsg);
755                         ask (prompt);
756                         return;
757                 }
758
759                 if (inch == 's') {
760                         in = nxtfld(inbuf);
761                         if (*in) {
762                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
763                                         fname[n] = in[n];
764                                 }
765                                 fname[n] = NULL;
766                         }
767                         else
768                                 strcpy(fname, "Messages");
769                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
770                 }
771                 else {
772                         strcpy(fname, _PATH_TMP);
773                         fd = mkstemp(fname);
774                         if (fd != -1) {
775                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
776                                     fname);
777                                 mailing = YES;
778                         }
779                 }
780                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
781                         if (fd != -1)
782                                 close(fd);
783                         warn("%s", fname);
784                         mailing = NO;
785                         fseek(newmsg, oldpos, 0);
786                         ask(prompt);
787                         return;
788                 }
789
790                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
791                         fwrite(inbuf, 1, n, cpto);
792
793                 fclose(cpfrom);
794                 fclose(cpto);
795                 fseek(newmsg, oldpos, 0);       /* reposition current message */
796                 if (inch == 's')
797                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
798                 else {
799                         system(cmdbuf);
800                         unlink(fname);
801                         mailing = NO;
802                 }
803                 ask(prompt);
804         }
805 }
806
807 void
808 gfrsub(FILE *infile)
809 {
810         off_t frompos;
811         int count;
812
813         seensubj = seenfrom = NO;
814         local = YES;
815         subj[0] = from[0] = date[0] = NULL;
816
817         /*
818          * Is this a normal message?
819          */
820         if (fgets(inbuf, sizeof inbuf, infile)) {
821                 if (strncmp(inbuf, "From", 4)==0) {
822                         /*
823                          * expected form starts with From
824                          */
825                         seenfrom = YES;
826                         frompos = ftell(infile);
827                         ptr = from;
828                         in = nxtfld(inbuf);
829                         if (*in) {
830                                 count = sizeof(from) - 1;
831                                 while (*in && *in > ' ' && count-- > 0) {
832                                         if (*in == ':' || *in == '@' ||
833                                             *in == '!')
834                                                 local = NO;
835                                         *ptr++ = *in++;
836                                 }
837                         }
838                         *ptr = NULL;
839                         if (*(in = nxtfld(in)))
840                                 strncpy(date, in, sizeof date);
841                         else {
842                                 date[0] = '\n';
843                                 date[1] = NULL;
844                         }
845                 }
846                 else {
847                         /*
848                          * not the expected form
849                          */
850                         fseek(infile, 0L, 0);
851                         return;
852                 }
853         }
854         else
855                 /*
856                  * empty file ?
857                  */
858                 return;
859
860         /*
861          * look for Subject line until EOF or a blank line
862          */
863         while (fgets(inbuf, sizeof inbuf, infile)
864             && !(blankline = (inbuf[0] == '\n'))) {
865                 /*
866                  * extract Subject line
867                  */
868                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
869                         seensubj = YES;
870                         frompos = ftell(infile);
871                         strncpy(subj, nxtfld(inbuf), sizeof subj);
872                 }
873         }
874         if (!blankline)
875                 /*
876                  * ran into EOF
877                  */
878                 fseek(infile, frompos, 0);
879
880         if (!seensubj)
881                 /*
882                  * for possible use with Mail
883                  */
884                 strncpy(subj, "(No Subject)\n", sizeof subj);
885 }
886
887 char *
888 nxtfld(unsigned char *s)
889 {
890         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
891         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
892         return (s);
893 }