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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1980, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)msgs.c	8.2 (Berkeley) 4/28/95";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD$");
44
45/*
46 * msgs - a user bulletin board program
47 *
48 * usage:
49 *	msgs [fhlopq] [[-]number]	to read messages
50 *	msgs -s				to place messages
51 *	msgs -c [-days]			to clean up the bulletin board
52 *
53 * prompt commands are:
54 *	y	print message
55 *	n	flush message, go to next message
56 *	q	flush message, quit
57 *	p	print message, turn on 'pipe thru more' mode
58 *	P	print message, turn off 'pipe thru more' mode
59 *	-	reprint last message
60 *	s[-][<num>] [<filename>]	save message
61 *	m[-][<num>]	mail with message in temp mbox
62 *	x	exit without flushing this message
63 *	<num>	print message number <num>
64 */
65
66#define V7		/* will look for TERM in the environment */
67#define OBJECT		/* will object to messages without Subjects */
68/* #define REJECT */	/* will reject messages without Subjects
69			   (OBJECT must be defined also) */
70/* #define UNBUFFERED *//* use unbuffered output */
71
72#include <sys/param.h>
73#include <sys/stat.h>
74#include <ctype.h>
75#include <dirent.h>
76#include <err.h>
77#include <errno.h>
78#include <fcntl.h>
79#include <locale.h>
80#include <pwd.h>
81#include <setjmp.h>
82#include <termcap.h>
83#include <termios.h>
84#include <signal.h>
85#include <stdio.h>
86#include <stdlib.h>
87#include <string.h>
88#include <time.h>
89#include <unistd.h>
90#include "pathnames.h"
91
92#define	CMODE	0644		/* bounds file creation	mode */
93#define NO	0
94#define YES	1
95#define SUPERUSER	0	/* superuser uid */
96#define DAEMON		1	/* daemon uid */
97#define NLINES	24		/* default number of lines/crt screen */
98#define NDAYS	21		/* default keep time for messages */
99#define DAYS	*24*60*60	/* seconds/day */
100#define MSGSRC	".msgsrc"	/* user's rc file */
101#define BOUNDS	"bounds"	/* message bounds file */
102#define NEXT	"Next message? [yq]"
103#define MORE	"More? [ynq]"
104#define NOMORE	"(No more) [q] ?"
105
106typedef	char	bool;
107
108static FILE	*msgsrc;
109static FILE	*newmsg;
110static const char *sep = "-";
111static char	inbuf[BUFSIZ];
112static char	fname[MAXPATHLEN];
113static char	cmdbuf[MAXPATHLEN + MAXPATHLEN];
114static char	subj[128];
115static char	from[128];
116static char	date[128];
117static char	*ptr;
118static char	*in;
119static bool	local;
120static bool	ruptible;
121static bool	totty;
122static bool	seenfrom;
123static bool	seensubj;
124static bool	blankline;
125static bool	printing = NO;
126static bool	mailing = NO;
127static bool	quitit = NO;
128static bool	sending = NO;
129static bool	intrpflg = NO;
130static uid_t	uid;
131static int	msg;
132static int	prevmsg;
133static int	lct;
134static int	nlines;
135static int	Lpp = 0;
136static time_t	t;
137static time_t	keep;
138
139/* option initialization */
140static bool	hdrs = NO;
141static bool	qopt = NO;
142static bool	hush = NO;
143static bool	send_msg = NO;
144static bool	locomode = NO;
145static bool	use_pager = NO;
146static bool	clean = NO;
147static bool	lastcmd = NO;
148static jmp_buf	tstpbuf;
149
150static void	ask(const char *);
151static void	gfrsub(FILE *);
152static int	linecnt(FILE *);
153static int	next(char *);
154static char	*nxtfld(char *);
155static void	onsusp(int);
156static void	onintr(int);
157static void	prmesg(int);
158static void	usage(void);
159
160int
161main(int argc, char *argv[])
162{
163	bool newrc, already;
164	int rcfirst = 0;		/* first message to print (from .rc) */
165	int rcback = 0;			/* amount to back off of rcfirst */
166	int firstmsg = 0, nextmsg = 0, lastmsg = 0;
167	int blast = 0;
168	struct stat buf;		/* stat to check access of bounds */
169	FILE *bounds;
170	char *cp;
171
172#ifdef UNBUFFERED
173	setbuf(stdout, NULL);
174#endif
175	setlocale(LC_ALL, "");
176
177	time(&t);
178	if (setuid(uid = getuid()) != 0)
179		err(1, "setuid failed");
180	ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
181	if (ruptible)
182		signal(SIGINT, SIG_DFL);
183
184	argc--, argv++;
185	while (argc > 0) {
186		if (isdigit(argv[0][0])) {	/* starting message # */
187			rcfirst = atoi(argv[0]);
188		}
189		else if (isdigit(argv[0][1])) {	/* backward offset */
190			rcback = atoi( &( argv[0][1] ) );
191		}
192		else {
193			ptr = *argv;
194			while (*ptr) switch (*ptr++) {
195
196			case '-':
197				break;
198
199			case 'c':
200				if (uid != SUPERUSER && uid != DAEMON)
201					errx(1,
202				"only the super-user can use the c flag");
203				clean = YES;
204				break;
205
206			case 'f':		/* silently */
207				hush = YES;
208				break;
209
210			case 'h':		/* headers only */
211				hdrs = YES;
212				break;
213
214			case 'l':		/* local msgs only */
215				locomode = YES;
216				break;
217
218			case 'o':		/* option to save last message */
219				lastcmd = YES;
220				break;
221
222			case 'p':		/* pipe thru 'more' during long msgs */
223				use_pager = YES;
224				break;
225
226			case 'q':		/* query only */
227				qopt = YES;
228				break;
229
230			case 's':		/* sending TO msgs */
231				send_msg = YES;
232				break;
233
234			default:
235				usage();
236			}
237		}
238		argc--, argv++;
239	}
240
241	/*
242	 * determine current message bounds
243	 */
244	snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
245
246	/*
247	 * Test access rights to the bounds file
248	 * This can be a little tricky.  if(send_msg), then
249	 * we will create it.  We assume that if(send_msg),
250	 * then you have write permission there.
251	 * Else, it better be there, or we bail.
252	 */
253	if (send_msg != YES) {
254		if (stat(fname, &buf) < 0) {
255			if (hush != YES) {
256				err(errno, "%s", fname);
257			} else {
258				exit(1);
259			}
260		}
261	}
262	bounds = fopen(fname, "r");
263
264	if (bounds != NULL) {
265		fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
266		fclose(bounds);
267		blast = lastmsg;	/* save upper bound */
268	}
269
270	if (clean)
271		keep = t - (rcback? rcback : NDAYS) DAYS;
272
273	if (clean || bounds == NULL) {	/* relocate message bounds */
274		struct dirent *dp;
275		struct stat stbuf;
276		bool seenany = NO;
277		DIR	*dirp;
278
279		dirp = opendir(_PATH_MSGS);
280		if (dirp == NULL)
281			err(errno, "%s", _PATH_MSGS);
282
283		firstmsg = 32767;
284		lastmsg = 0;
285
286		for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
287			cp = dp->d_name;
288			int i = 0;
289
290			if (dp->d_ino == 0)
291				continue;
292			if (dp->d_namlen == 0)
293				continue;
294
295			if (clean)
296				snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
297
298			while (isdigit(*cp))
299				i = i * 10 + *cp++ - '0';
300			if (*cp)
301				continue;	/* not a message! */
302
303			if (clean) {
304				if (stat(inbuf, &stbuf) != 0)
305					continue;
306				if (stbuf.st_mtime < keep
307				    && stbuf.st_mode&S_IWRITE) {
308					unlink(inbuf);
309					continue;
310				}
311			}
312
313			if (i > lastmsg)
314				lastmsg = i;
315			if (i < firstmsg)
316				firstmsg = i;
317			seenany = YES;
318		}
319		closedir(dirp);
320
321		if (!seenany) {
322			if (blast != 0)	/* never lower the upper bound! */
323				lastmsg = blast;
324			firstmsg = lastmsg + 1;
325		}
326		else if (blast > lastmsg)
327			lastmsg = blast;
328
329		if (!send_msg) {
330			bounds = fopen(fname, "w");
331			if (bounds == NULL)
332				err(errno, "%s", fname);
333			chmod(fname, CMODE);
334			fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
335			fclose(bounds);
336		}
337	}
338
339	if (send_msg) {
340		/*
341		 * Send mode - place msgs in _PATH_MSGS
342		 */
343		bounds = fopen(fname, "w");
344		if (bounds == NULL)
345			err(errno, "%s", fname);
346
347		nextmsg = lastmsg + 1;
348		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
349		newmsg = fopen(fname, "w");
350		if (newmsg == NULL)
351			err(errno, "%s", fname);
352		chmod(fname, CMODE);
353
354		fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
355		fclose(bounds);
356
357		sending = YES;
358		if (ruptible)
359			signal(SIGINT, onintr);
360
361		if (isatty(fileno(stdin))) {
362			ptr = getpwuid(uid)->pw_name;
363			printf("Message %d:\nFrom %s %sSubject: ",
364				nextmsg, ptr, ctime(&t));
365			fflush(stdout);
366			fgets(inbuf, sizeof inbuf, stdin);
367			putchar('\n');
368			fflush(stdout);
369			fprintf(newmsg, "From %s %sSubject: %s\n",
370				ptr, ctime(&t), inbuf);
371			blankline = seensubj = YES;
372		}
373		else
374			blankline = seensubj = NO;
375		for (;;) {
376			fgets(inbuf, sizeof inbuf, stdin);
377			if (feof(stdin) || ferror(stdin))
378				break;
379			blankline = (blankline || (inbuf[0] == '\n'));
380			seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
381			fputs(inbuf, newmsg);
382		}
383#ifdef OBJECT
384		if (!seensubj) {
385			printf("NOTICE: Messages should have a Subject field!\n");
386#ifdef REJECT
387			unlink(fname);
388#endif
389			exit(1);
390		}
391#endif
392		exit(ferror(stdin));
393	}
394	if (clean)
395		exit(0);
396
397	/*
398	 * prepare to display messages
399	 */
400	totty = (isatty(fileno(stdout)) != 0);
401	use_pager = use_pager && totty;
402
403	if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
404		fprintf(stderr, "Error, no home directory!\n");
405		exit(1);
406	}
407	snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
408	msgsrc = fopen(fname, "r");
409	if (msgsrc) {
410		newrc = NO;
411		fscanf(msgsrc, "%d\n", &nextmsg);
412		fclose(msgsrc);
413		if (nextmsg > lastmsg+1) {
414			printf("Warning: bounds have been reset (%d, %d)\n",
415				firstmsg, lastmsg);
416			truncate(fname, (off_t)0);
417			newrc = YES;
418		}
419		else if (!rcfirst)
420			rcfirst = nextmsg - rcback;
421	}
422	else
423		newrc = YES;
424	msgsrc = fopen(fname, "r+");
425	if (msgsrc == NULL)
426		msgsrc = fopen(fname, "w");
427	if (msgsrc == NULL)
428		err(errno, "%s", fname);
429	if (rcfirst) {
430		if (rcfirst > lastmsg+1) {
431			printf("Warning: the last message is number %d.\n",
432				lastmsg);
433			rcfirst = nextmsg;
434		}
435		if (rcfirst > firstmsg)
436			firstmsg = rcfirst;	/* don't set below first msg */
437	}
438	if (newrc) {
439		nextmsg = firstmsg;
440		rewind(msgsrc);
441		fprintf(msgsrc, "%d\n", nextmsg);
442		fflush(msgsrc);
443	}
444
445#ifdef V7
446	if (totty) {
447		struct winsize win;
448		if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
449			Lpp = win.ws_row;
450		if (Lpp <= 0) {
451			if (tgetent(inbuf, getenv("TERM")) <= 0
452			    || (Lpp = tgetnum("li")) <= 0) {
453				Lpp = NLINES;
454			}
455		}
456	}
457#endif
458	Lpp -= 6;	/* for headers, etc. */
459
460	already = NO;
461	prevmsg = firstmsg;
462	printing = YES;
463	if (ruptible)
464		signal(SIGINT, onintr);
465
466	/*
467	 * Main program loop
468	 */
469	for (msg = firstmsg; msg <= lastmsg; msg++) {
470
471		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
472		newmsg = fopen(fname, "r");
473		if (newmsg == NULL)
474			continue;
475
476		gfrsub(newmsg);		/* get From and Subject fields */
477		if (locomode && !local) {
478			fclose(newmsg);
479			continue;
480		}
481
482		if (qopt) {	/* This has to be located here */
483			printf("There are new messages.\n");
484			exit(0);
485		}
486
487		if (already && !hdrs)
488			putchar('\n');
489
490		/*
491		 * Print header
492		 */
493		if (totty)
494			signal(SIGTSTP, onsusp);
495		(void) setjmp(tstpbuf);
496		already = YES;
497		nlines = 2;
498		if (seenfrom) {
499			printf("Message %d:\nFrom %s %s", msg, from, date);
500			nlines++;
501		}
502		if (seensubj) {
503			printf("Subject: %s", subj);
504			nlines++;
505		}
506		else {
507			if (seenfrom) {
508				putchar('\n');
509				nlines++;
510			}
511			while (nlines < 6
512			    && fgets(inbuf, sizeof inbuf, newmsg)
513			    && inbuf[0] != '\n') {
514				fputs(inbuf, stdout);
515				nlines++;
516			}
517		}
518
519		lct = linecnt(newmsg);
520		if (lct)
521			printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
522			    (lct == 1) ? "" : "s");
523
524		if (hdrs) {
525			printf("\n-----\n");
526			fclose(newmsg);
527			continue;
528		}
529
530		/*
531		 * Ask user for command
532		 */
533		if (totty)
534			ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
535		else
536			inbuf[0] = 'y';
537		if (totty)
538			signal(SIGTSTP, SIG_DFL);
539cmnd:
540		in = inbuf;
541		switch (*in) {
542			case 'x':
543				/* FALLTHROUGH */
544			case 'X':
545				exit(0);
546				/* NOTREACHED */
547
548			case 'q':
549				/* FALLTHROUGH */
550			case 'Q':
551				quitit = YES;
552				printf("--Postponed--\n");
553				exit(0);
554				/* NOTREACHED */
555
556			case 'n':
557				/* FALLTHROUGH */
558			case 'N':
559				if (msg >= nextmsg) sep = "Flushed";
560				prevmsg = msg;
561				break;
562
563			case 'p':
564				/* FALLTHROUGH */
565			case 'P':
566				use_pager = (*in++ == 'p');
567				/* FALLTHROUGH */
568			case '\n':
569				/* FALLTHROUGH */
570			case 'y':
571			default:
572				if (*in == '-') {
573					msg = prevmsg-1;
574					sep = "replay";
575					break;
576				}
577				if (isdigit(*in)) {
578					msg = next(in);
579					sep = in;
580					break;
581				}
582
583				prmesg(nlines + lct + (seensubj? 1 : 0));
584				prevmsg = msg;
585
586		}
587
588		printf("--%s--\n", sep);
589		sep = "-";
590		if (msg >= nextmsg) {
591			nextmsg = msg + 1;
592			rewind(msgsrc);
593			fprintf(msgsrc, "%d\n", nextmsg);
594			fflush(msgsrc);
595		}
596		if (newmsg)
597			fclose(newmsg);
598		if (quitit)
599			break;
600	}
601
602	/*
603	 * Make sure .rc file gets updated
604	 */
605	if (--msg >= nextmsg) {
606		nextmsg = msg + 1;
607		rewind(msgsrc);
608		fprintf(msgsrc, "%d\n", nextmsg);
609		fflush(msgsrc);
610	}
611	if (already && !quitit && lastcmd && totty) {
612		/*
613		 * save or reply to last message?
614		 */
615		msg = prevmsg;
616		ask(NOMORE);
617		if (inbuf[0] == '-' || isdigit(inbuf[0]))
618			goto cmnd;
619	}
620	if (!(already || hush || qopt))
621		printf("No new messages.\n");
622	exit(0);
623	/* NOTREACHED */
624}
625
626static void
627usage(void)
628{
629	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
630	exit(1);
631}
632
633static void
634prmesg(int length)
635{
636	FILE *outf;
637	char *env_pager;
638
639	if (use_pager && length > Lpp) {
640		signal(SIGPIPE, SIG_IGN);
641		signal(SIGQUIT, SIG_IGN);
642		if ((env_pager = getenv("PAGER")) == NULL) {
643			snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
644		} else {
645			snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
646		}
647		outf = popen(cmdbuf, "w");
648		if (!outf)
649			outf = stdout;
650		else
651			setbuf(outf, (char *)NULL);
652	}
653	else
654		outf = stdout;
655
656	if (seensubj)
657		putc('\n', outf);
658
659	while (fgets(inbuf, sizeof inbuf, newmsg)) {
660		fputs(inbuf, outf);
661		if (ferror(outf)) {
662			clearerr(outf);
663			break;
664		}
665	}
666
667	if (outf != stdout) {
668		pclose(outf);
669		signal(SIGPIPE, SIG_DFL);
670		signal(SIGQUIT, SIG_DFL);
671	}
672	else {
673		fflush(stdout);
674	}
675
676	/* force wait on output */
677	tcdrain(fileno(stdout));
678}
679
680static void
681onintr(int unused __unused)
682{
683	signal(SIGINT, onintr);
684	if (mailing)
685		unlink(fname);
686	if (sending) {
687		unlink(fname);
688		puts("--Killed--");
689		exit(1);
690	}
691	if (printing) {
692		putchar('\n');
693		if (hdrs)
694			exit(0);
695		sep = "Interrupt";
696		if (newmsg)
697			fseeko(newmsg, (off_t)0, SEEK_END);
698		intrpflg = YES;
699	}
700}
701
702/*
703 * We have just gotten a susp.  Suspend and prepare to resume.
704 */
705static void
706onsusp(int unused __unused)
707{
708	signal(SIGTSTP, SIG_DFL);
709	sigsetmask(0);
710	kill(0, SIGTSTP);
711	signal(SIGTSTP, onsusp);
712	if (!mailing)
713		longjmp(tstpbuf, 0);
714}
715
716static int
717linecnt(FILE *f)
718{
719	off_t oldpos = ftello(f);
720	int l = 0;
721	char lbuf[BUFSIZ];
722
723	while (fgets(lbuf, sizeof lbuf, f))
724		l++;
725	clearerr(f);
726	fseeko(f, oldpos, SEEK_SET);
727	return (l);
728}
729
730static int
731next(char *buf)
732{
733	int i;
734	sscanf(buf, "%d", &i);
735	sprintf(buf, "Goto %d", i);
736	return(--i);
737}
738
739static void
740ask(const char *prompt)
741{
742	char	inch;
743	int	n, cmsg, fd;
744	off_t	oldpos;
745	FILE	*cpfrom, *cpto;
746
747	printf("%s ", prompt);
748	fflush(stdout);
749	intrpflg = NO;
750	(void) fgets(inbuf, sizeof inbuf, stdin);
751	if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
752		inbuf[n - 1] = '\0';
753	if (intrpflg)
754		inbuf[0] = 'x';
755
756	/*
757	 * Handle 'mail' and 'save' here.
758	 */
759	if ((inch = inbuf[0]) == 's' || inch == 'm') {
760		if (inbuf[1] == '-')
761			cmsg = prevmsg;
762		else if (isdigit(inbuf[1]))
763			cmsg = atoi(&inbuf[1]);
764		else
765			cmsg = msg;
766		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
767
768		oldpos = ftello(newmsg);
769
770		cpfrom = fopen(fname, "r");
771		if (!cpfrom) {
772			printf("Message %d not found\n", cmsg);
773			ask (prompt);
774			return;
775		}
776
777		if (inch == 's') {
778			in = nxtfld(inbuf);
779			if (*in) {
780				for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
781					fname[n] = in[n];
782				}
783				fname[n] = '\0';
784			}
785			else
786				strcpy(fname, "Messages");
787			fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
788		}
789		else {
790			strcpy(fname, _PATH_TMP);
791			fd = mkstemp(fname);
792			if (fd != -1) {
793				snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
794				    fname);
795				mailing = YES;
796			}
797		}
798		if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
799			if (fd != -1)
800				close(fd);
801			warn("%s", fname);
802			mailing = NO;
803			fseeko(newmsg, oldpos, SEEK_SET);
804			ask(prompt);
805			return;
806		}
807
808		while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
809			fwrite(inbuf, 1, n, cpto);
810
811		fclose(cpfrom);
812		fclose(cpto);
813		fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
814		if (inch == 's')
815			printf("Message %d saved in \"%s\"\n", cmsg, fname);
816		else {
817			system(cmdbuf);
818			unlink(fname);
819			mailing = NO;
820		}
821		ask(prompt);
822	}
823}
824
825static void
826gfrsub(FILE *infile)
827{
828	off_t frompos;
829	int count;
830
831	seensubj = seenfrom = NO;
832	local = YES;
833	subj[0] = from[0] = date[0] = '\0';
834
835	/*
836	 * Is this a normal message?
837	 */
838	if (fgets(inbuf, sizeof inbuf, infile)) {
839		if (strncmp(inbuf, "From", 4)==0) {
840			/*
841			 * expected form starts with From
842			 */
843			seenfrom = YES;
844			frompos = ftello(infile);
845			ptr = from;
846			in = nxtfld(inbuf);
847			if (*in) {
848				count = sizeof(from) - 1;
849				while (*in && *in > ' ' && count-- > 0) {
850					if (*in == ':' || *in == '@' ||
851					    *in == '!')
852						local = NO;
853					*ptr++ = *in++;
854				}
855			}
856			*ptr = '\0';
857			if (*(in = nxtfld(in)))
858				strncpy(date, in, sizeof date);
859			else {
860				date[0] = '\n';
861				date[1] = '\0';
862			}
863		}
864		else {
865			/*
866			 * not the expected form
867			 */
868			rewind(infile);
869			return;
870		}
871	}
872	else
873		/*
874		 * empty file ?
875		 */
876		return;
877
878	/*
879	 * look for Subject line until EOF or a blank line
880	 */
881	while (fgets(inbuf, sizeof inbuf, infile)
882	    && !(blankline = (inbuf[0] == '\n'))) {
883		/*
884		 * extract Subject line
885		 */
886		if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
887			seensubj = YES;
888			frompos = ftello(infile);
889			strncpy(subj, nxtfld(inbuf), sizeof subj);
890		}
891	}
892	if (!blankline)
893		/*
894		 * ran into EOF
895		 */
896		fseeko(infile, frompos, SEEK_SET);
897
898	if (!seensubj)
899		/*
900		 * for possible use with Mail
901		 */
902		strncpy(subj, "(No Subject)\n", sizeof subj);
903}
904
905static char *
906nxtfld(char *s)
907{
908	if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
909	if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
910	return (s);
911}
912