msgs.c revision 94504 
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
35static 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#ifndef lint
41#if 0
42static char sccsid[] = "@(#)msgs.c	8.2 (Berkeley) 4/28/95";
43#endif
44#endif /* not lint */
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/msgs/msgs.c 94504 2002-04-12 13:11:42Z charnier $");
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
110typedef	char	bool;
111
112FILE		*msgsrc;
113FILE		*newmsg;
114const char	*sep = "-";
115char		inbuf[BUFSIZ];
116char		fname[MAXPATHLEN];
117char		cmdbuf[MAXPATHLEN + MAXPATHLEN];
118char		subj[128];
119char		from[128];
120char		date[128];
121char		*ptr;
122char		*in;
123bool		local;
124bool		ruptible;
125bool		totty;
126bool		seenfrom;
127bool		seensubj;
128bool		blankline;
129bool		printing = NO;
130bool		mailing = NO;
131bool		quitit = NO;
132bool		sending = NO;
133bool		intrpflg = NO;
134uid_t		uid;
135int		msg;
136int		prevmsg;
137int		lct;
138int		nlines;
139int		Lpp = 0;
140time_t		t;
141time_t		keep;
142
143/* option initialization */
144bool	hdrs = NO;
145bool	qopt = NO;
146bool	hush = NO;
147bool	send_msg = NO;
148bool	locomode = NO;
149bool	use_pager = NO;
150bool	clean = NO;
151bool	lastcmd = NO;
152jmp_buf	tstpbuf;
153
154
155void		ask(const char *);
156void		gfrsub(FILE *);
157int		linecnt(FILE *);
158int		main(int, char *[]);
159int		next(char *);
160char		*nxtfld(unsigned char *);
161void		onsusp(int);
162void		onintr(int);
163void		prmesg(int);
164static void	usage(void);
165
166int
167main(argc, argv)
168int argc; char *argv[];
169{
170	bool newrc, already;
171	int rcfirst = 0;		/* first message to print (from .rc) */
172	int rcback = 0;			/* amount to back off of rcfirst */
173	int firstmsg = 0, nextmsg = 0, lastmsg = 0;
174	int blast = 0;
175	struct stat buf;		/* stat to check access of bounds */
176	FILE *bounds;
177
178#ifdef UNBUFFERED
179	setbuf(stdout, NULL);
180#endif
181	setlocale(LC_ALL, "");
182
183	time(&t);
184	setuid(uid = getuid());
185	ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
186	if (ruptible)
187		signal(SIGINT, SIG_DFL);
188
189	argc--, argv++;
190	while (argc > 0) {
191		if (isdigit(argv[0][0])) {	/* starting message # */
192			rcfirst = atoi(argv[0]);
193		}
194		else if (isdigit(argv[0][1])) {	/* backward offset */
195			rcback = atoi( &( argv[0][1] ) );
196		}
197		else {
198			ptr = *argv;
199			while (*ptr) switch (*ptr++) {
200
201			case '-':
202				break;
203
204			case 'c':
205				if (uid != SUPERUSER && uid != DAEMON)
206					errx(1,
207				"only the super-user can use the c flag");
208				clean = YES;
209				break;
210
211			case 'f':		/* silently */
212				hush = YES;
213				break;
214
215			case 'h':		/* headers only */
216				hdrs = YES;
217				break;
218
219			case 'l':		/* local msgs only */
220				locomode = YES;
221				break;
222
223			case 'o':		/* option to save last message */
224				lastcmd = YES;
225				break;
226
227			case 'p':		/* pipe thru 'more' during long msgs */
228				use_pager = YES;
229				break;
230
231			case 'q':		/* query only */
232				qopt = YES;
233				break;
234
235			case 's':		/* sending TO msgs */
236				send_msg = YES;
237				break;
238
239			default:
240				usage();
241			}
242		}
243		argc--, argv++;
244	}
245
246	/*
247	 * determine current message bounds
248	 */
249	snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
250
251	/*
252	 * Test access rights to the bounds file
253	 * This can be a little tricky.  if(send_msg), then
254	 * we will create it.  We assume that if(send_msg),
255	 * then you have write permission there.
256	 * Else, it better be there, or we bail.
257	 */
258	if (send_msg != YES) {
259		if (stat(fname, &buf) < 0) {
260			if (hush != YES) {
261				err(errno, "%s", fname);
262			} else {
263				exit(1);
264			}
265		}
266	}
267	bounds = fopen(fname, "r");
268
269	if (bounds != NULL) {
270		fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
271		fclose(bounds);
272		blast = lastmsg;	/* save upper bound */
273	}
274
275	if (clean)
276		keep = t - (rcback? rcback : NDAYS) DAYS;
277
278	if (clean || bounds == NULL) {	/* relocate message bounds */
279		struct dirent *dp;
280		struct stat stbuf;
281		bool seenany = NO;
282		DIR	*dirp;
283
284		dirp = opendir(_PATH_MSGS);
285		if (dirp == NULL)
286			err(errno, "%s", _PATH_MSGS);
287
288		firstmsg = 32767;
289		lastmsg = 0;
290
291		for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
292			register char *cp = dp->d_name;
293			register int i = 0;
294
295			if (dp->d_ino == 0)
296				continue;
297			if (dp->d_namlen == 0)
298				continue;
299
300			if (clean)
301				snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
302
303			while (isdigit(*cp))
304				i = i * 10 + *cp++ - '0';
305			if (*cp)
306				continue;	/* not a message! */
307
308			if (clean) {
309				if (stat(inbuf, &stbuf) != 0)
310					continue;
311				if (stbuf.st_mtime < keep
312				    && stbuf.st_mode&S_IWRITE) {
313					unlink(inbuf);
314					continue;
315				}
316			}
317
318			if (i > lastmsg)
319				lastmsg = i;
320			if (i < firstmsg)
321				firstmsg = i;
322			seenany = YES;
323		}
324		closedir(dirp);
325
326		if (!seenany) {
327			if (blast != 0)	/* never lower the upper bound! */
328				lastmsg = blast;
329			firstmsg = lastmsg + 1;
330		}
331		else if (blast > lastmsg)
332			lastmsg = blast;
333
334		if (!send_msg) {
335			bounds = fopen(fname, "w");
336			if (bounds == NULL)
337				err(errno, "%s", fname);
338			chmod(fname, CMODE);
339			fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
340			fclose(bounds);
341		}
342	}
343
344	if (send_msg) {
345		/*
346		 * Send mode - place msgs in _PATH_MSGS
347		 */
348		bounds = fopen(fname, "w");
349		if (bounds == NULL)
350			err(errno, "%s", fname);
351
352		nextmsg = lastmsg + 1;
353		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
354		newmsg = fopen(fname, "w");
355		if (newmsg == NULL)
356			err(errno, "%s", fname);
357		chmod(fname, CMODE);
358
359		fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
360		fclose(bounds);
361
362		sending = YES;
363		if (ruptible)
364			signal(SIGINT, onintr);
365
366		if (isatty(fileno(stdin))) {
367			ptr = getpwuid(uid)->pw_name;
368			printf("Message %d:\nFrom %s %sSubject: ",
369				nextmsg, ptr, ctime(&t));
370			fflush(stdout);
371			fgets(inbuf, sizeof inbuf, stdin);
372			putchar('\n');
373			fflush(stdout);
374			fprintf(newmsg, "From %s %sSubject: %s\n",
375				ptr, ctime(&t), inbuf);
376			blankline = seensubj = YES;
377		}
378		else
379			blankline = seensubj = NO;
380		for (;;) {
381			fgets(inbuf, sizeof inbuf, stdin);
382			if (feof(stdin) || ferror(stdin))
383				break;
384			blankline = (blankline || (inbuf[0] == '\n'));
385			seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
386			fputs(inbuf, newmsg);
387		}
388#ifdef OBJECT
389		if (!seensubj) {
390			printf("NOTICE: Messages should have a Subject field!\n");
391#ifdef REJECT
392			unlink(fname);
393#endif
394			exit(1);
395		}
396#endif
397		exit(ferror(stdin));
398	}
399	if (clean)
400		exit(0);
401
402	/*
403	 * prepare to display messages
404	 */
405	totty = (isatty(fileno(stdout)) != 0);
406	use_pager = use_pager && totty;
407
408	snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
409	msgsrc = fopen(fname, "r");
410	if (msgsrc) {
411		newrc = NO;
412		fscanf(msgsrc, "%d\n", &nextmsg);
413		fclose(msgsrc);
414		if (nextmsg > lastmsg+1) {
415			printf("Warning: bounds have been reset (%d, %d)\n",
416				firstmsg, lastmsg);
417			truncate(fname, (off_t)0);
418			newrc = YES;
419		}
420		else if (!rcfirst)
421			rcfirst = nextmsg - rcback;
422	}
423	else
424		newrc = YES;
425	msgsrc = fopen(fname, "r+");
426	if (msgsrc == NULL)
427		msgsrc = fopen(fname, "w");
428	if (msgsrc == NULL)
429		err(errno, "%s", fname);
430	if (rcfirst) {
431		if (rcfirst > lastmsg+1) {
432			printf("Warning: the last message is number %d.\n",
433				lastmsg);
434			rcfirst = nextmsg;
435		}
436		if (rcfirst > firstmsg)
437			firstmsg = rcfirst;	/* don't set below first msg */
438	}
439	if (newrc) {
440		nextmsg = firstmsg;
441		rewind(msgsrc);
442		fprintf(msgsrc, "%d\n", nextmsg);
443		fflush(msgsrc);
444	}
445
446#ifdef V7
447	if (totty) {
448		struct winsize win;
449		if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
450			Lpp = win.ws_row;
451		if (Lpp <= 0) {
452			if (tgetent(inbuf, getenv("TERM")) <= 0
453			    || (Lpp = tgetnum(__DECONST(char *, "li"))) <= 0) {
454				Lpp = NLINES;
455			}
456		}
457	}
458#endif
459	Lpp -= 6;	/* for headers, etc. */
460
461	already = NO;
462	prevmsg = firstmsg;
463	printing = YES;
464	if (ruptible)
465		signal(SIGINT, onintr);
466
467	/*
468	 * Main program loop
469	 */
470	for (msg = firstmsg; msg <= lastmsg; msg++) {
471
472		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
473		newmsg = fopen(fname, "r");
474		if (newmsg == NULL)
475			continue;
476
477		gfrsub(newmsg);		/* get From and Subject fields */
478		if (locomode && !local) {
479			fclose(newmsg);
480			continue;
481		}
482
483		if (qopt) {	/* This has to be located here */
484			printf("There are new messages.\n");
485			exit(0);
486		}
487
488		if (already && !hdrs)
489			putchar('\n');
490
491		/*
492		 * Print header
493		 */
494		if (totty)
495			signal(SIGTSTP, onsusp);
496		(void) setjmp(tstpbuf);
497		already = YES;
498		nlines = 2;
499		if (seenfrom) {
500			printf("Message %d:\nFrom %s %s", msg, from, date);
501			nlines++;
502		}
503		if (seensubj) {
504			printf("Subject: %s", subj);
505			nlines++;
506		}
507		else {
508			if (seenfrom) {
509				putchar('\n');
510				nlines++;
511			}
512			while (nlines < 6
513			    && fgets(inbuf, sizeof inbuf, newmsg)
514			    && inbuf[0] != '\n') {
515				fputs(inbuf, stdout);
516				nlines++;
517			}
518		}
519
520		lct = linecnt(newmsg);
521		if (lct)
522			printf("(%d%slines) ", lct, seensubj? " " : " more ");
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			case 'q':
548				/* FALLTHROUGH */
549			case 'Q':
550				quitit = YES;
551				printf("--Postponed--\n");
552				exit(0);
553				/* NOTREACHED */
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
624static void
625usage()
626{
627	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
628	exit(1);
629}
630
631void
632prmesg(length)
633int length;
634{
635	FILE *outf;
636	char *env_pager;
637
638	if (use_pager && length > Lpp) {
639		signal(SIGPIPE, SIG_IGN);
640		signal(SIGQUIT, SIG_IGN);
641		if ((env_pager = getenv("PAGER")) == NULL) {
642			snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
643		} else {
644			snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
645		}
646		outf = popen(cmdbuf, "w");
647		if (!outf)
648			outf = stdout;
649		else
650			setbuf(outf, (char *)NULL);
651	}
652	else
653		outf = stdout;
654
655	if (seensubj)
656		putc('\n', outf);
657
658	while (fgets(inbuf, sizeof inbuf, newmsg)) {
659		fputs(inbuf, outf);
660		if (ferror(outf)) {
661			clearerr(outf);
662			break;
663		}
664	}
665
666	if (outf != stdout) {
667		pclose(outf);
668		signal(SIGPIPE, SIG_DFL);
669		signal(SIGQUIT, SIG_DFL);
670	}
671	else {
672		fflush(stdout);
673	}
674
675	/* force wait on output */
676	tcdrain(fileno(stdout));
677}
678
679void
680onintr(unused)
681	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 */
705void
706onsusp(unused)
707	int unused __unused;
708{
709	signal(SIGTSTP, SIG_DFL);
710	sigsetmask(0);
711	kill(0, SIGTSTP);
712	signal(SIGTSTP, onsusp);
713	if (!mailing)
714		longjmp(tstpbuf, 0);
715}
716
717int
718linecnt(f)
719FILE *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
732int
733next(buf)
734char *buf;
735{
736	int i;
737	sscanf(buf, "%d", &i);
738	sprintf(buf, "Goto %d", i);
739	return(--i);
740}
741
742void
743ask(prompt)
744const char *prompt;
745{
746	char	inch;
747	int	n, cmsg, fd;
748	off_t	oldpos;
749	FILE	*cpfrom, *cpto;
750
751	printf("%s ", prompt);
752	fflush(stdout);
753	intrpflg = NO;
754	(void) fgets(inbuf, sizeof inbuf, stdin);
755	if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
756		inbuf[n - 1] = '\0';
757	if (intrpflg)
758		inbuf[0] = 'x';
759
760	/*
761	 * Handle 'mail' and 'save' here.
762	 */
763	if ((inch = inbuf[0]) == 's' || inch == 'm') {
764		if (inbuf[1] == '-')
765			cmsg = prevmsg;
766		else if (isdigit(inbuf[1]))
767			cmsg = atoi(&inbuf[1]);
768		else
769			cmsg = msg;
770		snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
771
772		oldpos = ftello(newmsg);
773
774		cpfrom = fopen(fname, "r");
775		if (!cpfrom) {
776			printf("Message %d not found\n", cmsg);
777			ask (prompt);
778			return;
779		}
780
781		if (inch == 's') {
782			in = nxtfld(inbuf);
783			if (*in) {
784				for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
785					fname[n] = in[n];
786				}
787				fname[n] = NULL;
788			}
789			else
790				strcpy(fname, "Messages");
791			fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
792		}
793		else {
794			strcpy(fname, _PATH_TMP);
795			fd = mkstemp(fname);
796			if (fd != -1) {
797				snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
798				    fname);
799				mailing = YES;
800			}
801		}
802		if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
803			if (fd != -1)
804				close(fd);
805			warn("%s", fname);
806			mailing = NO;
807			fseeko(newmsg, oldpos, SEEK_SET);
808			ask(prompt);
809			return;
810		}
811
812		while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
813			fwrite(inbuf, 1, n, cpto);
814
815		fclose(cpfrom);
816		fclose(cpto);
817		fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
818		if (inch == 's')
819			printf("Message %d saved in \"%s\"\n", cmsg, fname);
820		else {
821			system(cmdbuf);
822			unlink(fname);
823			mailing = NO;
824		}
825		ask(prompt);
826	}
827}
828
829void
830gfrsub(infile)
831FILE *infile;
832{
833	off_t frompos;
834	int count;
835
836	seensubj = seenfrom = NO;
837	local = YES;
838	subj[0] = from[0] = date[0] = NULL;
839
840	/*
841	 * Is this a normal message?
842	 */
843	if (fgets(inbuf, sizeof inbuf, infile)) {
844		if (strncmp(inbuf, "From", 4)==0) {
845			/*
846			 * expected form starts with From
847			 */
848			seenfrom = YES;
849			frompos = ftello(infile);
850			ptr = from;
851			in = nxtfld(inbuf);
852			if (*in) {
853				count = sizeof(from) - 1;
854				while (*in && *in > ' ' && count-- > 0) {
855					if (*in == ':' || *in == '@' ||
856					    *in == '!')
857						local = NO;
858					*ptr++ = *in++;
859				}
860			}
861			*ptr = NULL;
862			if (*(in = nxtfld(in)))
863				strncpy(date, in, sizeof date);
864			else {
865				date[0] = '\n';
866				date[1] = NULL;
867			}
868		}
869		else {
870			/*
871			 * not the expected form
872			 */
873			rewind(infile);
874			return;
875		}
876	}
877	else
878		/*
879		 * empty file ?
880		 */
881		return;
882
883	/*
884	 * look for Subject line until EOF or a blank line
885	 */
886	while (fgets(inbuf, sizeof inbuf, infile)
887	    && !(blankline = (inbuf[0] == '\n'))) {
888		/*
889		 * extract Subject line
890		 */
891		if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
892			seensubj = YES;
893			frompos = ftello(infile);
894			strncpy(subj, nxtfld(inbuf), sizeof subj);
895		}
896	}
897	if (!blankline)
898		/*
899		 * ran into EOF
900		 */
901		fseeko(infile, frompos, SEEK_SET);
902
903	if (!seensubj)
904		/*
905		 * for possible use with Mail
906		 */
907		strncpy(subj, "(No Subject)\n", sizeof subj);
908}
909
910char *
911nxtfld(s)
912unsigned char *s;
913{
914	if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
915	if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
916	return (s);
917}
918