1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1980, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)msgs.c	8.2 (Berkeley) 4/28/95";
41#endif /* not lint */
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47/*
48 * msgs - a user bulletin board program
49 *
50 * usage:
51 *	msgs [fhlopq] [[-]number]	to read messages
52 *	msgs -s				to place messages
53 *	msgs -c [-days]			to clean up the bulletin board
54 *
55 * prompt commands are:
56 *	y	print message
57 *	n	flush message, go to next message
58 *	q	flush message, quit
59 *	p	print message, turn on 'pipe thru more' mode
60 *	P	print message, turn off 'pipe thru more' mode
61 *	-	reprint last message
62 *	s[-][<num>] [<filename>]	save message
63 *	m[-][<num>]	mail with message in temp mbox
64 *	x	exit without flushing this message
65 *	<num>	print message number <num>
66 */
67
68#define V7		/* will look for TERM in the environment */
69#define OBJECT		/* will object to messages without Subjects */
70/* #define REJECT */	/* will reject messages without Subjects
71			   (OBJECT must be defined also) */
72/* #define UNBUFFERED *//* use unbuffered output */
73
74#include <sys/param.h>
75#include <sys/stat.h>
76#include <ctype.h>
77#include <dirent.h>
78#include <err.h>
79#include <errno.h>
80#include <fcntl.h>
81#include <locale.h>
82#include <pwd.h>
83#include <setjmp.h>
84#include <termcap.h>
85#include <termios.h>
86#include <signal.h>
87#include <stdio.h>
88#include <stdlib.h>
89#include <string.h>
90#include <time.h>
91#include <unistd.h>
92#include "pathnames.h"
93
94#define	CMODE	0644		/* bounds file creation	mode */
95#define NO	0
96#define YES	1
97#define SUPERUSER	0	/* superuser uid */
98#define DAEMON		1	/* daemon uid */
99#define NLINES	24		/* default number of lines/crt screen */
100#define NDAYS	21		/* default keep time for messages */
101#define DAYS	*24*60*60	/* seconds/day */
102#define MSGSRC	".msgsrc"	/* user's rc file */
103#define BOUNDS	"bounds"	/* message bounds file */
104#define NEXT	"Next message? [yq]"
105#define MORE	"More? [ynq]"
106#define NOMORE	"(No more) [q] ?"
107
108typedef	char	bool;
109
110static FILE	*msgsrc;
111static FILE	*newmsg;
112static const char *sep = "-";
113static char	inbuf[BUFSIZ];
114static char	fname[MAXPATHLEN];
115static char	cmdbuf[MAXPATHLEN + MAXPATHLEN];
116static char	subj[128];
117static char	from[128];
118static char	date[128];
119static char	*ptr;
120static char	*in;
121static bool	local;
122static bool	ruptible;
123static bool	totty;
124static bool	seenfrom;
125static bool	seensubj;
126static bool	blankline;
127static bool	printing = NO;
128static bool	mailing = NO;
129static bool	quitit = NO;
130static bool	sending = NO;
131static bool	intrpflg = NO;
132static uid_t	uid;
133static int	msg;
134static int	prevmsg;
135static int	lct;
136static int	nlines;
137static int	Lpp = 0;
138static time_t	t;
139static time_t	keep;
140
141/* option initialization */
142static bool	hdrs = NO;
143static bool	qopt = NO;
144static bool	hush = NO;
145static bool	send_msg = NO;
146static bool	locomode = NO;
147static bool	use_pager = NO;
148static bool	clean = NO;
149static bool	lastcmd = NO;
150static jmp_buf	tstpbuf;
151
152static void	ask(const char *);
153static void	gfrsub(FILE *);
154static int	linecnt(FILE *);
155static int	next(char *);
156static char	*nxtfld(char *);
157static void	onsusp(int);
158static void	onintr(int);
159static void	prmesg(int);
160static void	usage(void);
161
162int
163main(int argc, char *argv[])
164{
165	bool newrc, already;
166	int rcfirst = 0;		/* first message to print (from .rc) */
167	int rcback = 0;			/* amount to back off of rcfirst */
168	int firstmsg = 0, nextmsg = 0, lastmsg = 0;
169	int blast = 0;
170	struct stat buf;		/* stat to check access of bounds */
171	FILE *bounds;
172	char *cp;
173
174#ifdef UNBUFFERED
175	setbuf(stdout, NULL);
176#endif
177	setlocale(LC_ALL, "");
178
179	time(&t);
180	if (setuid(uid = getuid()) != 0)
181		err(1, "setuid failed");
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			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	if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
406		fprintf(stderr, "Error, no home directory!\n");
407		exit(1);
408	}
409	snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
410	msgsrc = fopen(fname, "r");
411	if (msgsrc) {
412		newrc = NO;
413		fscanf(msgsrc, "%d\n", &nextmsg);
414		fclose(msgsrc);
415		if (nextmsg > lastmsg+1) {
416			printf("Warning: bounds have been reset (%d, %d)\n",
417				firstmsg, lastmsg);
418			truncate(fname, (off_t)0);
419			newrc = YES;
420		}
421		else if (!rcfirst)
422			rcfirst = nextmsg - rcback;
423	}
424	else
425		newrc = YES;
426	msgsrc = fopen(fname, "r+");
427	if (msgsrc == NULL)
428		msgsrc = fopen(fname, "w");
429	if (msgsrc == NULL)
430		err(errno, "%s", fname);
431	if (rcfirst) {
432		if (rcfirst > lastmsg+1) {
433			printf("Warning: the last message is number %d.\n",
434				lastmsg);
435			rcfirst = nextmsg;
436		}
437		if (rcfirst > firstmsg)
438			firstmsg = rcfirst;	/* don't set below first msg */
439	}
440	if (newrc) {
441		nextmsg = firstmsg;
442		rewind(msgsrc);
443		fprintf(msgsrc, "%d\n", nextmsg);
444		fflush(msgsrc);
445	}
446
447#ifdef V7
448	if (totty) {
449		struct winsize win;
450		if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
451			Lpp = win.ws_row;
452		if (Lpp <= 0) {
453			if (tgetent(inbuf, getenv("TERM")) <= 0
454			    || (Lpp = tgetnum("li")) <= 0) {
455				Lpp = NLINES;
456			}
457		}
458	}
459#endif
460	Lpp -= 6;	/* for headers, etc. */
461
462	already = NO;
463	prevmsg = firstmsg;
464	printing = YES;
465	if (ruptible)
466		signal(SIGINT, onintr);
467
468	/*
469	 * Main program loop
470	 */
471	for (msg = firstmsg; msg <= lastmsg; msg++) {
472
473		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
474		newmsg = fopen(fname, "r");
475		if (newmsg == NULL)
476			continue;
477
478		gfrsub(newmsg);		/* get From and Subject fields */
479		if (locomode && !local) {
480			fclose(newmsg);
481			continue;
482		}
483
484		if (qopt) {	/* This has to be located here */
485			printf("There are new messages.\n");
486			exit(0);
487		}
488
489		if (already && !hdrs)
490			putchar('\n');
491
492		/*
493		 * Print header
494		 */
495		if (totty)
496			signal(SIGTSTP, onsusp);
497		(void) setjmp(tstpbuf);
498		already = YES;
499		nlines = 2;
500		if (seenfrom) {
501			printf("Message %d:\nFrom %s %s", msg, from, date);
502			nlines++;
503		}
504		if (seensubj) {
505			printf("Subject: %s", subj);
506			nlines++;
507		}
508		else {
509			if (seenfrom) {
510				putchar('\n');
511				nlines++;
512			}
513			while (nlines < 6
514			    && fgets(inbuf, sizeof inbuf, newmsg)
515			    && inbuf[0] != '\n') {
516				fputs(inbuf, stdout);
517				nlines++;
518			}
519		}
520
521		lct = linecnt(newmsg);
522		if (lct)
523			printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
524			    (lct == 1) ? "" : "s");
525
526		if (hdrs) {
527			printf("\n-----\n");
528			fclose(newmsg);
529			continue;
530		}
531
532		/*
533		 * Ask user for command
534		 */
535		if (totty)
536			ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
537		else
538			inbuf[0] = 'y';
539		if (totty)
540			signal(SIGTSTP, SIG_DFL);
541cmnd:
542		in = inbuf;
543		switch (*in) {
544			case 'x':
545				/* FALLTHROUGH */
546			case 'X':
547				exit(0);
548				/* NOTREACHED */
549
550			case 'q':
551				/* FALLTHROUGH */
552			case 'Q':
553				quitit = YES;
554				printf("--Postponed--\n");
555				exit(0);
556				/* NOTREACHED */
557
558			case 'n':
559				/* FALLTHROUGH */
560			case 'N':
561				if (msg >= nextmsg) sep = "Flushed";
562				prevmsg = msg;
563				break;
564
565			case 'p':
566				/* FALLTHROUGH */
567			case 'P':
568				use_pager = (*in++ == 'p');
569				/* FALLTHROUGH */
570			case '\n':
571				/* FALLTHROUGH */
572			case 'y':
573			default:
574				if (*in == '-') {
575					msg = prevmsg-1;
576					sep = "replay";
577					break;
578				}
579				if (isdigit(*in)) {
580					msg = next(in);
581					sep = in;
582					break;
583				}
584
585				prmesg(nlines + lct + (seensubj? 1 : 0));
586				prevmsg = msg;
587
588		}
589
590		printf("--%s--\n", sep);
591		sep = "-";
592		if (msg >= nextmsg) {
593			nextmsg = msg + 1;
594			rewind(msgsrc);
595			fprintf(msgsrc, "%d\n", nextmsg);
596			fflush(msgsrc);
597		}
598		if (newmsg)
599			fclose(newmsg);
600		if (quitit)
601			break;
602	}
603
604	/*
605	 * Make sure .rc file gets updated
606	 */
607	if (--msg >= nextmsg) {
608		nextmsg = msg + 1;
609		rewind(msgsrc);
610		fprintf(msgsrc, "%d\n", nextmsg);
611		fflush(msgsrc);
612	}
613	if (already && !quitit && lastcmd && totty) {
614		/*
615		 * save or reply to last message?
616		 */
617		msg = prevmsg;
618		ask(NOMORE);
619		if (inbuf[0] == '-' || isdigit(inbuf[0]))
620			goto cmnd;
621	}
622	if (!(already || hush || qopt))
623		printf("No new messages.\n");
624	exit(0);
625	/* NOTREACHED */
626}
627
628static void
629usage(void)
630{
631	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
632	exit(1);
633}
634
635static void
636prmesg(int length)
637{
638	FILE *outf;
639	char *env_pager;
640
641	if (use_pager && length > Lpp) {
642		signal(SIGPIPE, SIG_IGN);
643		signal(SIGQUIT, SIG_IGN);
644		if ((env_pager = getenv("PAGER")) == NULL) {
645			snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
646		} else {
647			snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
648		}
649		outf = popen(cmdbuf, "w");
650		if (!outf)
651			outf = stdout;
652		else
653			setbuf(outf, (char *)NULL);
654	}
655	else
656		outf = stdout;
657
658	if (seensubj)
659		putc('\n', outf);
660
661	while (fgets(inbuf, sizeof inbuf, newmsg)) {
662		fputs(inbuf, outf);
663		if (ferror(outf)) {
664			clearerr(outf);
665			break;
666		}
667	}
668
669	if (outf != stdout) {
670		pclose(outf);
671		signal(SIGPIPE, SIG_DFL);
672		signal(SIGQUIT, SIG_DFL);
673	}
674	else {
675		fflush(stdout);
676	}
677
678	/* force wait on output */
679	tcdrain(fileno(stdout));
680}
681
682static void
683onintr(int unused __unused)
684{
685	signal(SIGINT, onintr);
686	if (mailing)
687		unlink(fname);
688	if (sending) {
689		unlink(fname);
690		puts("--Killed--");
691		exit(1);
692	}
693	if (printing) {
694		putchar('\n');
695		if (hdrs)
696			exit(0);
697		sep = "Interrupt";
698		if (newmsg)
699			fseeko(newmsg, (off_t)0, SEEK_END);
700		intrpflg = YES;
701	}
702}
703
704/*
705 * We have just gotten a susp.  Suspend and prepare to resume.
706 */
707static void
708onsusp(int unused __unused)
709{
710	signal(SIGTSTP, SIG_DFL);
711	sigsetmask(0);
712	kill(0, SIGTSTP);
713	signal(SIGTSTP, onsusp);
714	if (!mailing)
715		longjmp(tstpbuf, 0);
716}
717
718static int
719linecnt(FILE *f)
720{
721	off_t oldpos = ftello(f);
722	int l = 0;
723	char lbuf[BUFSIZ];
724
725	while (fgets(lbuf, sizeof lbuf, f))
726		l++;
727	clearerr(f);
728	fseeko(f, oldpos, SEEK_SET);
729	return (l);
730}
731
732static int
733next(char *buf)
734{
735	int i;
736	sscanf(buf, "%d", &i);
737	sprintf(buf, "Goto %d", i);
738	return(--i);
739}
740
741static void
742ask(const char *prompt)
743{
744	char	inch;
745	int	n, cmsg, fd;
746	off_t	oldpos;
747	FILE	*cpfrom, *cpto;
748
749	printf("%s ", prompt);
750	fflush(stdout);
751	intrpflg = NO;
752	(void) fgets(inbuf, sizeof inbuf, stdin);
753	if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
754		inbuf[n - 1] = '\0';
755	if (intrpflg)
756		inbuf[0] = 'x';
757
758	/*
759	 * Handle 'mail' and 'save' here.
760	 */
761	if ((inch = inbuf[0]) == 's' || inch == 'm') {
762		if (inbuf[1] == '-')
763			cmsg = prevmsg;
764		else if (isdigit(inbuf[1]))
765			cmsg = atoi(&inbuf[1]);
766		else
767			cmsg = msg;
768		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
769
770		oldpos = ftello(newmsg);
771
772		cpfrom = fopen(fname, "r");
773		if (!cpfrom) {
774			printf("Message %d not found\n", cmsg);
775			ask (prompt);
776			return;
777		}
778
779		if (inch == 's') {
780			in = nxtfld(inbuf);
781			if (*in) {
782				for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
783					fname[n] = in[n];
784				}
785				fname[n] = '\0';
786			}
787			else
788				strcpy(fname, "Messages");
789			fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
790		}
791		else {
792			strcpy(fname, _PATH_TMP);
793			fd = mkstemp(fname);
794			if (fd != -1) {
795				snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
796				    fname);
797				mailing = YES;
798			}
799		}
800		if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
801			if (fd != -1)
802				close(fd);
803			warn("%s", fname);
804			mailing = NO;
805			fseeko(newmsg, oldpos, SEEK_SET);
806			ask(prompt);
807			fclose(cpfrom);
808			return;
809		}
810
811		while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
812			fwrite(inbuf, 1, n, cpto);
813
814		fclose(cpfrom);
815		fclose(cpto);
816		fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
817		if (inch == 's')
818			printf("Message %d saved in \"%s\"\n", cmsg, fname);
819		else {
820			system(cmdbuf);
821			unlink(fname);
822			mailing = NO;
823		}
824		ask(prompt);
825	}
826}
827
828static void
829gfrsub(FILE *infile)
830{
831	off_t frompos;
832	int count;
833
834	seensubj = seenfrom = NO;
835	local = YES;
836	subj[0] = from[0] = date[0] = '\0';
837
838	/*
839	 * Is this a normal message?
840	 */
841	if (fgets(inbuf, sizeof inbuf, infile)) {
842		if (strncmp(inbuf, "From", 4)==0) {
843			/*
844			 * expected form starts with From
845			 */
846			seenfrom = YES;
847			frompos = ftello(infile);
848			ptr = from;
849			in = nxtfld(inbuf);
850			if (*in) {
851				count = sizeof(from) - 1;
852				while (*in && *in > ' ' && count-- > 0) {
853					if (*in == ':' || *in == '@' ||
854					    *in == '!')
855						local = NO;
856					*ptr++ = *in++;
857				}
858			}
859			*ptr = '\0';
860			if (*(in = nxtfld(in)))
861				strlcpy(date, in, sizeof date);
862			else {
863				date[0] = '\n';
864				date[1] = '\0';
865			}
866		}
867		else {
868			/*
869			 * not the expected form
870			 */
871			rewind(infile);
872			return;
873		}
874	}
875	else
876		/*
877		 * empty file ?
878		 */
879		return;
880
881	/*
882	 * look for Subject line until EOF or a blank line
883	 */
884	while (fgets(inbuf, sizeof inbuf, infile)
885	    && !(blankline = (inbuf[0] == '\n'))) {
886		/*
887		 * extract Subject line
888		 */
889		if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
890			seensubj = YES;
891			frompos = ftello(infile);
892			strlcpy(subj, nxtfld(inbuf), sizeof subj);
893		}
894	}
895	if (!blankline)
896		/*
897		 * ran into EOF
898		 */
899		fseeko(infile, frompos, SEEK_SET);
900
901	if (!seensubj)
902		/*
903		 * for possible use with Mail
904		 */
905		strlcpy(subj, "(No Subject)\n", sizeof subj);
906}
907
908static char *
909nxtfld(char *s)
910{
911	if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
912	if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
913	return (s);
914}
915