xref: /freebsd/usr.bin/msgs/msgs.c (revision 3642298923e528d795e3a30ec165d2b469e28b40)
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 
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1980, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 
40 #if 0
41 #ifndef lint
42 static char sccsid[] = "@(#)msgs.c	8.2 (Berkeley) 4/28/95";
43 #endif /* not lint */
44 #endif
45 
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 /*
50  * msgs - a user bulletin board program
51  *
52  * usage:
53  *	msgs [fhlopq] [[-]number]	to read messages
54  *	msgs -s				to place messages
55  *	msgs -c [-days]			to clean up the bulletin board
56  *
57  * prompt commands are:
58  *	y	print message
59  *	n	flush message, go to next message
60  *	q	flush message, quit
61  *	p	print message, turn on 'pipe thru more' mode
62  *	P	print message, turn off 'pipe thru more' mode
63  *	-	reprint last message
64  *	s[-][<num>] [<filename>]	save message
65  *	m[-][<num>]	mail with message in temp mbox
66  *	x	exit without flushing this message
67  *	<num>	print message number <num>
68  */
69 
70 #define V7		/* will look for TERM in the environment */
71 #define OBJECT		/* will object to messages without Subjects */
72 /* #define REJECT */	/* will reject messages without Subjects
73 			   (OBJECT must be defined also) */
74 /* #define UNBUFFERED *//* use unbuffered output */
75 
76 #include <sys/param.h>
77 #include <sys/stat.h>
78 #include <ctype.h>
79 #include <dirent.h>
80 #include <err.h>
81 #include <errno.h>
82 #include <fcntl.h>
83 #include <locale.h>
84 #include <pwd.h>
85 #include <setjmp.h>
86 #include <termcap.h>
87 #include <termios.h>
88 #include <signal.h>
89 #include <stdio.h>
90 #include <stdlib.h>
91 #include <string.h>
92 #include <time.h>
93 #include <unistd.h>
94 #include "pathnames.h"
95 
96 #define	CMODE	0644		/* bounds file creation	mode */
97 #define NO	0
98 #define YES	1
99 #define SUPERUSER	0	/* superuser uid */
100 #define DAEMON		1	/* daemon uid */
101 #define NLINES	24		/* default number of lines/crt screen */
102 #define NDAYS	21		/* default keep time for messages */
103 #define DAYS	*24*60*60	/* seconds/day */
104 #define MSGSRC	".msgsrc"	/* user's rc file */
105 #define BOUNDS	"bounds"	/* message bounds file */
106 #define NEXT	"Next message? [yq]"
107 #define MORE	"More? [ynq]"
108 #define NOMORE	"(No more) [q] ?"
109 
110 typedef	char	bool;
111 
112 FILE	*msgsrc;
113 FILE	*newmsg;
114 const char *sep = "-";
115 char	inbuf[BUFSIZ];
116 char	fname[MAXPATHLEN];
117 char	cmdbuf[MAXPATHLEN + MAXPATHLEN];
118 char	subj[128];
119 char	from[128];
120 char	date[128];
121 char	*ptr;
122 char	*in;
123 bool	local;
124 bool	ruptible;
125 bool	totty;
126 bool	seenfrom;
127 bool	seensubj;
128 bool	blankline;
129 bool	printing = NO;
130 bool	mailing = NO;
131 bool	quitit = NO;
132 bool	sending = NO;
133 bool	intrpflg = NO;
134 uid_t	uid;
135 int	msg;
136 int	prevmsg;
137 int	lct;
138 int	nlines;
139 int	Lpp = 0;
140 time_t	t;
141 time_t	keep;
142 
143 /* option initialization */
144 bool	hdrs = NO;
145 bool	qopt = NO;
146 bool	hush = NO;
147 bool	send_msg = NO;
148 bool	locomode = NO;
149 bool	use_pager = NO;
150 bool	clean = NO;
151 bool	lastcmd = NO;
152 jmp_buf	tstpbuf;
153 
154 static void	ask(const char *);
155 static void	gfrsub(FILE *);
156 static int	linecnt(FILE *);
157 static int	next(char *);
158 static char	*nxtfld(char *);
159 static void	onsusp(int);
160 static void	onintr(int);
161 static void	prmesg(int);
162 static void usage(void);
163 
164 int
165 main(int argc, char *argv[])
166 {
167 	bool newrc, already;
168 	int rcfirst = 0;		/* first message to print (from .rc) */
169 	int rcback = 0;			/* amount to back off of rcfirst */
170 	int firstmsg = 0, nextmsg = 0, lastmsg = 0;
171 	int blast = 0;
172 	struct stat buf;		/* stat to check access of bounds */
173 	FILE *bounds;
174 
175 #ifdef UNBUFFERED
176 	setbuf(stdout, NULL);
177 #endif
178 	setlocale(LC_ALL, "");
179 
180 	time(&t);
181 	setuid(uid = getuid());
182 	ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
183 	if (ruptible)
184 		signal(SIGINT, SIG_DFL);
185 
186 	argc--, argv++;
187 	while (argc > 0) {
188 		if (isdigit(argv[0][0])) {	/* starting message # */
189 			rcfirst = atoi(argv[0]);
190 		}
191 		else if (isdigit(argv[0][1])) {	/* backward offset */
192 			rcback = atoi( &( argv[0][1] ) );
193 		}
194 		else {
195 			ptr = *argv;
196 			while (*ptr) switch (*ptr++) {
197 
198 			case '-':
199 				break;
200 
201 			case 'c':
202 				if (uid != SUPERUSER && uid != DAEMON)
203 					errx(1,
204 				"only the super-user can use the c flag");
205 				clean = YES;
206 				break;
207 
208 			case 'f':		/* silently */
209 				hush = YES;
210 				break;
211 
212 			case 'h':		/* headers only */
213 				hdrs = YES;
214 				break;
215 
216 			case 'l':		/* local msgs only */
217 				locomode = YES;
218 				break;
219 
220 			case 'o':		/* option to save last message */
221 				lastcmd = YES;
222 				break;
223 
224 			case 'p':		/* pipe thru 'more' during long msgs */
225 				use_pager = YES;
226 				break;
227 
228 			case 'q':		/* query only */
229 				qopt = YES;
230 				break;
231 
232 			case 's':		/* sending TO msgs */
233 				send_msg = YES;
234 				break;
235 
236 			default:
237 				usage();
238 			}
239 		}
240 		argc--, argv++;
241 	}
242 
243 	/*
244 	 * determine current message bounds
245 	 */
246 	snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
247 
248 	/*
249 	 * Test access rights to the bounds file
250 	 * This can be a little tricky.  if(send_msg), then
251 	 * we will create it.  We assume that if(send_msg),
252 	 * then you have write permission there.
253 	 * Else, it better be there, or we bail.
254 	 */
255 	if (send_msg != YES) {
256 		if (stat(fname, &buf) < 0) {
257 			if (hush != YES) {
258 				err(errno, "%s", fname);
259 			} else {
260 				exit(1);
261 			}
262 		}
263 	}
264 	bounds = fopen(fname, "r");
265 
266 	if (bounds != NULL) {
267 		fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
268 		fclose(bounds);
269 		blast = lastmsg;	/* save upper bound */
270 	}
271 
272 	if (clean)
273 		keep = t - (rcback? rcback : NDAYS) DAYS;
274 
275 	if (clean || bounds == NULL) {	/* relocate message bounds */
276 		struct dirent *dp;
277 		struct stat stbuf;
278 		bool seenany = NO;
279 		DIR	*dirp;
280 
281 		dirp = opendir(_PATH_MSGS);
282 		if (dirp == NULL)
283 			err(errno, "%s", _PATH_MSGS);
284 
285 		firstmsg = 32767;
286 		lastmsg = 0;
287 
288 		for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
289 			char *cp = dp->d_name;
290 			int i = 0;
291 
292 			if (dp->d_ino == 0)
293 				continue;
294 			if (dp->d_namlen == 0)
295 				continue;
296 
297 			if (clean)
298 				snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
299 
300 			while (isdigit(*cp))
301 				i = i * 10 + *cp++ - '0';
302 			if (*cp)
303 				continue;	/* not a message! */
304 
305 			if (clean) {
306 				if (stat(inbuf, &stbuf) != 0)
307 					continue;
308 				if (stbuf.st_mtime < keep
309 				    && stbuf.st_mode&S_IWRITE) {
310 					unlink(inbuf);
311 					continue;
312 				}
313 			}
314 
315 			if (i > lastmsg)
316 				lastmsg = i;
317 			if (i < firstmsg)
318 				firstmsg = i;
319 			seenany = YES;
320 		}
321 		closedir(dirp);
322 
323 		if (!seenany) {
324 			if (blast != 0)	/* never lower the upper bound! */
325 				lastmsg = blast;
326 			firstmsg = lastmsg + 1;
327 		}
328 		else if (blast > lastmsg)
329 			lastmsg = blast;
330 
331 		if (!send_msg) {
332 			bounds = fopen(fname, "w");
333 			if (bounds == NULL)
334 				err(errno, "%s", fname);
335 			chmod(fname, CMODE);
336 			fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
337 			fclose(bounds);
338 		}
339 	}
340 
341 	if (send_msg) {
342 		/*
343 		 * Send mode - place msgs in _PATH_MSGS
344 		 */
345 		bounds = fopen(fname, "w");
346 		if (bounds == NULL)
347 			err(errno, "%s", fname);
348 
349 		nextmsg = lastmsg + 1;
350 		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
351 		newmsg = fopen(fname, "w");
352 		if (newmsg == NULL)
353 			err(errno, "%s", fname);
354 		chmod(fname, CMODE);
355 
356 		fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
357 		fclose(bounds);
358 
359 		sending = YES;
360 		if (ruptible)
361 			signal(SIGINT, onintr);
362 
363 		if (isatty(fileno(stdin))) {
364 			ptr = getpwuid(uid)->pw_name;
365 			printf("Message %d:\nFrom %s %sSubject: ",
366 				nextmsg, ptr, ctime(&t));
367 			fflush(stdout);
368 			fgets(inbuf, sizeof inbuf, stdin);
369 			putchar('\n');
370 			fflush(stdout);
371 			fprintf(newmsg, "From %s %sSubject: %s\n",
372 				ptr, ctime(&t), inbuf);
373 			blankline = seensubj = YES;
374 		}
375 		else
376 			blankline = seensubj = NO;
377 		for (;;) {
378 			fgets(inbuf, sizeof inbuf, stdin);
379 			if (feof(stdin) || ferror(stdin))
380 				break;
381 			blankline = (blankline || (inbuf[0] == '\n'));
382 			seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
383 			fputs(inbuf, newmsg);
384 		}
385 #ifdef OBJECT
386 		if (!seensubj) {
387 			printf("NOTICE: Messages should have a Subject field!\n");
388 #ifdef REJECT
389 			unlink(fname);
390 #endif
391 			exit(1);
392 		}
393 #endif
394 		exit(ferror(stdin));
395 	}
396 	if (clean)
397 		exit(0);
398 
399 	/*
400 	 * prepare to display messages
401 	 */
402 	totty = (isatty(fileno(stdout)) != 0);
403 	use_pager = use_pager && totty;
404 
405 	snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
406 	msgsrc = fopen(fname, "r");
407 	if (msgsrc) {
408 		newrc = NO;
409 		fscanf(msgsrc, "%d\n", &nextmsg);
410 		fclose(msgsrc);
411 		if (nextmsg > lastmsg+1) {
412 			printf("Warning: bounds have been reset (%d, %d)\n",
413 				firstmsg, lastmsg);
414 			truncate(fname, (off_t)0);
415 			newrc = YES;
416 		}
417 		else if (!rcfirst)
418 			rcfirst = nextmsg - rcback;
419 	}
420 	else
421 		newrc = YES;
422 	msgsrc = fopen(fname, "r+");
423 	if (msgsrc == NULL)
424 		msgsrc = fopen(fname, "w");
425 	if (msgsrc == NULL)
426 		err(errno, "%s", fname);
427 	if (rcfirst) {
428 		if (rcfirst > lastmsg+1) {
429 			printf("Warning: the last message is number %d.\n",
430 				lastmsg);
431 			rcfirst = nextmsg;
432 		}
433 		if (rcfirst > firstmsg)
434 			firstmsg = rcfirst;	/* don't set below first msg */
435 	}
436 	if (newrc) {
437 		nextmsg = firstmsg;
438 		rewind(msgsrc);
439 		fprintf(msgsrc, "%d\n", nextmsg);
440 		fflush(msgsrc);
441 	}
442 
443 #ifdef V7
444 	if (totty) {
445 		struct winsize win;
446 		if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
447 			Lpp = win.ws_row;
448 		if (Lpp <= 0) {
449 			if (tgetent(inbuf, getenv("TERM")) <= 0
450 			    || (Lpp = tgetnum("li")) <= 0) {
451 				Lpp = NLINES;
452 			}
453 		}
454 	}
455 #endif
456 	Lpp -= 6;	/* for headers, etc. */
457 
458 	already = NO;
459 	prevmsg = firstmsg;
460 	printing = YES;
461 	if (ruptible)
462 		signal(SIGINT, onintr);
463 
464 	/*
465 	 * Main program loop
466 	 */
467 	for (msg = firstmsg; msg <= lastmsg; msg++) {
468 
469 		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
470 		newmsg = fopen(fname, "r");
471 		if (newmsg == NULL)
472 			continue;
473 
474 		gfrsub(newmsg);		/* get From and Subject fields */
475 		if (locomode && !local) {
476 			fclose(newmsg);
477 			continue;
478 		}
479 
480 		if (qopt) {	/* This has to be located here */
481 			printf("There are new messages.\n");
482 			exit(0);
483 		}
484 
485 		if (already && !hdrs)
486 			putchar('\n');
487 
488 		/*
489 		 * Print header
490 		 */
491 		if (totty)
492 			signal(SIGTSTP, onsusp);
493 		(void) setjmp(tstpbuf);
494 		already = YES;
495 		nlines = 2;
496 		if (seenfrom) {
497 			printf("Message %d:\nFrom %s %s", msg, from, date);
498 			nlines++;
499 		}
500 		if (seensubj) {
501 			printf("Subject: %s", subj);
502 			nlines++;
503 		}
504 		else {
505 			if (seenfrom) {
506 				putchar('\n');
507 				nlines++;
508 			}
509 			while (nlines < 6
510 			    && fgets(inbuf, sizeof inbuf, newmsg)
511 			    && inbuf[0] != '\n') {
512 				fputs(inbuf, stdout);
513 				nlines++;
514 			}
515 		}
516 
517 		lct = linecnt(newmsg);
518 		if (lct)
519 			printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
520 			    (lct == 1) ? "" : "s");
521 
522 		if (hdrs) {
523 			printf("\n-----\n");
524 			fclose(newmsg);
525 			continue;
526 		}
527 
528 		/*
529 		 * Ask user for command
530 		 */
531 		if (totty)
532 			ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
533 		else
534 			inbuf[0] = 'y';
535 		if (totty)
536 			signal(SIGTSTP, SIG_DFL);
537 cmnd:
538 		in = inbuf;
539 		switch (*in) {
540 			case 'x':
541 				/* FALLTHROUGH */
542 			case 'X':
543 				exit(0);
544 				/* NOTREACHED */
545 
546 			case 'q':
547 				/* FALLTHROUGH */
548 			case 'Q':
549 				quitit = YES;
550 				printf("--Postponed--\n");
551 				exit(0);
552 				/* NOTREACHED */
553 
554 			case 'n':
555 				/* FALLTHROUGH */
556 			case 'N':
557 				if (msg >= nextmsg) sep = "Flushed";
558 				prevmsg = msg;
559 				break;
560 
561 			case 'p':
562 				/* FALLTHROUGH */
563 			case 'P':
564 				use_pager = (*in++ == 'p');
565 				/* FALLTHROUGH */
566 			case '\n':
567 				/* FALLTHROUGH */
568 			case 'y':
569 			default:
570 				if (*in == '-') {
571 					msg = prevmsg-1;
572 					sep = "replay";
573 					break;
574 				}
575 				if (isdigit(*in)) {
576 					msg = next(in);
577 					sep = in;
578 					break;
579 				}
580 
581 				prmesg(nlines + lct + (seensubj? 1 : 0));
582 				prevmsg = msg;
583 
584 		}
585 
586 		printf("--%s--\n", sep);
587 		sep = "-";
588 		if (msg >= nextmsg) {
589 			nextmsg = msg + 1;
590 			rewind(msgsrc);
591 			fprintf(msgsrc, "%d\n", nextmsg);
592 			fflush(msgsrc);
593 		}
594 		if (newmsg)
595 			fclose(newmsg);
596 		if (quitit)
597 			break;
598 	}
599 
600 	/*
601 	 * Make sure .rc file gets updated
602 	 */
603 	if (--msg >= nextmsg) {
604 		nextmsg = msg + 1;
605 		rewind(msgsrc);
606 		fprintf(msgsrc, "%d\n", nextmsg);
607 		fflush(msgsrc);
608 	}
609 	if (already && !quitit && lastcmd && totty) {
610 		/*
611 		 * save or reply to last message?
612 		 */
613 		msg = prevmsg;
614 		ask(NOMORE);
615 		if (inbuf[0] == '-' || isdigit(inbuf[0]))
616 			goto cmnd;
617 	}
618 	if (!(already || hush || qopt))
619 		printf("No new messages.\n");
620 	exit(0);
621 	/* NOTREACHED */
622 }
623 
624 static void
625 usage(void)
626 {
627 	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
628 	exit(1);
629 }
630 
631 static void
632 prmesg(int length)
633 {
634 	FILE *outf;
635 	char *env_pager;
636 
637 	if (use_pager && length > Lpp) {
638 		signal(SIGPIPE, SIG_IGN);
639 		signal(SIGQUIT, SIG_IGN);
640 		if ((env_pager = getenv("PAGER")) == NULL) {
641 			snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
642 		} else {
643 			snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
644 		}
645 		outf = popen(cmdbuf, "w");
646 		if (!outf)
647 			outf = stdout;
648 		else
649 			setbuf(outf, (char *)NULL);
650 	}
651 	else
652 		outf = stdout;
653 
654 	if (seensubj)
655 		putc('\n', outf);
656 
657 	while (fgets(inbuf, sizeof inbuf, newmsg)) {
658 		fputs(inbuf, outf);
659 		if (ferror(outf)) {
660 			clearerr(outf);
661 			break;
662 		}
663 	}
664 
665 	if (outf != stdout) {
666 		pclose(outf);
667 		signal(SIGPIPE, SIG_DFL);
668 		signal(SIGQUIT, SIG_DFL);
669 	}
670 	else {
671 		fflush(stdout);
672 	}
673 
674 	/* force wait on output */
675 	tcdrain(fileno(stdout));
676 }
677 
678 static void
679 onintr(int unused __unused)
680 {
681 	signal(SIGINT, onintr);
682 	if (mailing)
683 		unlink(fname);
684 	if (sending) {
685 		unlink(fname);
686 		puts("--Killed--");
687 		exit(1);
688 	}
689 	if (printing) {
690 		putchar('\n');
691 		if (hdrs)
692 			exit(0);
693 		sep = "Interrupt";
694 		if (newmsg)
695 			fseeko(newmsg, (off_t)0, SEEK_END);
696 		intrpflg = YES;
697 	}
698 }
699 
700 /*
701  * We have just gotten a susp.  Suspend and prepare to resume.
702  */
703 static void
704 onsusp(int unused __unused)
705 {
706 	signal(SIGTSTP, SIG_DFL);
707 	sigsetmask(0);
708 	kill(0, SIGTSTP);
709 	signal(SIGTSTP, onsusp);
710 	if (!mailing)
711 		longjmp(tstpbuf, 0);
712 }
713 
714 static int
715 linecnt(FILE *f)
716 {
717 	off_t oldpos = ftello(f);
718 	int l = 0;
719 	char lbuf[BUFSIZ];
720 
721 	while (fgets(lbuf, sizeof lbuf, f))
722 		l++;
723 	clearerr(f);
724 	fseeko(f, oldpos, SEEK_SET);
725 	return (l);
726 }
727 
728 static int
729 next(char *buf)
730 {
731 	int i;
732 	sscanf(buf, "%d", &i);
733 	sprintf(buf, "Goto %d", i);
734 	return(--i);
735 }
736 
737 static void
738 ask(const char *prompt)
739 {
740 	char	inch;
741 	int	n, cmsg, fd;
742 	off_t	oldpos;
743 	FILE	*cpfrom, *cpto;
744 
745 	printf("%s ", prompt);
746 	fflush(stdout);
747 	intrpflg = NO;
748 	(void) fgets(inbuf, sizeof inbuf, stdin);
749 	if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
750 		inbuf[n - 1] = '\0';
751 	if (intrpflg)
752 		inbuf[0] = 'x';
753 
754 	/*
755 	 * Handle 'mail' and 'save' here.
756 	 */
757 	if ((inch = inbuf[0]) == 's' || inch == 'm') {
758 		if (inbuf[1] == '-')
759 			cmsg = prevmsg;
760 		else if (isdigit(inbuf[1]))
761 			cmsg = atoi(&inbuf[1]);
762 		else
763 			cmsg = msg;
764 		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
765 
766 		oldpos = ftello(newmsg);
767 
768 		cpfrom = fopen(fname, "r");
769 		if (!cpfrom) {
770 			printf("Message %d not found\n", cmsg);
771 			ask (prompt);
772 			return;
773 		}
774 
775 		if (inch == 's') {
776 			in = nxtfld(inbuf);
777 			if (*in) {
778 				for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
779 					fname[n] = in[n];
780 				}
781 				fname[n] = '\0';
782 			}
783 			else
784 				strcpy(fname, "Messages");
785 			fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
786 		}
787 		else {
788 			strcpy(fname, _PATH_TMP);
789 			fd = mkstemp(fname);
790 			if (fd != -1) {
791 				snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
792 				    fname);
793 				mailing = YES;
794 			}
795 		}
796 		if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
797 			if (fd != -1)
798 				close(fd);
799 			warn("%s", fname);
800 			mailing = NO;
801 			fseeko(newmsg, oldpos, SEEK_SET);
802 			ask(prompt);
803 			return;
804 		}
805 
806 		while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
807 			fwrite(inbuf, 1, n, cpto);
808 
809 		fclose(cpfrom);
810 		fclose(cpto);
811 		fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
812 		if (inch == 's')
813 			printf("Message %d saved in \"%s\"\n", cmsg, fname);
814 		else {
815 			system(cmdbuf);
816 			unlink(fname);
817 			mailing = NO;
818 		}
819 		ask(prompt);
820 	}
821 }
822 
823 static void
824 gfrsub(FILE *infile)
825 {
826 	off_t frompos;
827 	int count;
828 
829 	seensubj = seenfrom = NO;
830 	local = YES;
831 	subj[0] = from[0] = date[0] = '\0';
832 
833 	/*
834 	 * Is this a normal message?
835 	 */
836 	if (fgets(inbuf, sizeof inbuf, infile)) {
837 		if (strncmp(inbuf, "From", 4)==0) {
838 			/*
839 			 * expected form starts with From
840 			 */
841 			seenfrom = YES;
842 			frompos = ftello(infile);
843 			ptr = from;
844 			in = nxtfld(inbuf);
845 			if (*in) {
846 				count = sizeof(from) - 1;
847 				while (*in && *in > ' ' && count-- > 0) {
848 					if (*in == ':' || *in == '@' ||
849 					    *in == '!')
850 						local = NO;
851 					*ptr++ = *in++;
852 				}
853 			}
854 			*ptr = '\0';
855 			if (*(in = nxtfld(in)))
856 				strncpy(date, in, sizeof date);
857 			else {
858 				date[0] = '\n';
859 				date[1] = '\0';
860 			}
861 		}
862 		else {
863 			/*
864 			 * not the expected form
865 			 */
866 			rewind(infile);
867 			return;
868 		}
869 	}
870 	else
871 		/*
872 		 * empty file ?
873 		 */
874 		return;
875 
876 	/*
877 	 * look for Subject line until EOF or a blank line
878 	 */
879 	while (fgets(inbuf, sizeof inbuf, infile)
880 	    && !(blankline = (inbuf[0] == '\n'))) {
881 		/*
882 		 * extract Subject line
883 		 */
884 		if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
885 			seensubj = YES;
886 			frompos = ftello(infile);
887 			strncpy(subj, nxtfld(inbuf), sizeof subj);
888 		}
889 	}
890 	if (!blankline)
891 		/*
892 		 * ran into EOF
893 		 */
894 		fseeko(infile, frompos, SEEK_SET);
895 
896 	if (!seensubj)
897 		/*
898 		 * for possible use with Mail
899 		 */
900 		strncpy(subj, "(No Subject)\n", sizeof subj);
901 }
902 
903 static char *
904 nxtfld(char *s)
905 {
906 	if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
907 	if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
908 	return (s);
909 }
910