msgs.c revision 82846 
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
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/msgs/msgs.c 82846 2001-09-03 04:30:46Z ache $";
46#endif /* not lint */
47
48/*
49 * msgs - a user bulletin board program
50 *
51 * usage:
52 *	msgs [fhlopq] [[-]number]	to read messages
53 *	msgs -s				to place messages
54 *	msgs -c [-days]			to clean up the bulletin board
55 *
56 * prompt commands are:
57 *	y	print message
58 *	n	flush message, go to next message
59 *	q	flush message, quit
60 *	p	print message, turn on 'pipe thru more' mode
61 *	P	print message, turn off 'pipe thru more' mode
62 *	-	reprint last message
63 *	s[-][<num>] [<filename>]	save message
64 *	m[-][<num>]	mail with message in temp mbox
65 *	x	exit without flushing this message
66 *	<num>	print message number <num>
67 */
68
69#define V7		/* will look for TERM in the environment */
70#define OBJECT		/* will object to messages without Subjects */
71/* #define REJECT */	/* will reject messages without Subjects
72			   (OBJECT must be defined also) */
73/* #define UNBUFFERED *//* use unbuffered output */
74
75#include <sys/param.h>
76#include <sys/stat.h>
77#include <ctype.h>
78#include <dirent.h>
79#include <err.h>
80#include <errno.h>
81#include <fcntl.h>
82#include <locale.h>
83#include <pwd.h>
84#include <setjmp.h>
85#include <termcap.h>
86#include <termios.h>
87#include <signal.h>
88#include <stdio.h>
89#include <stdlib.h>
90#include <string.h>
91#include <time.h>
92#include <unistd.h>
93#include "pathnames.h"
94
95#define	CMODE	0644		/* bounds file creation	mode */
96#define NO	0
97#define YES	1
98#define SUPERUSER	0	/* superuser uid */
99#define DAEMON		1	/* daemon uid */
100#define NLINES	24		/* default number of lines/crt screen */
101#define NDAYS	21		/* default keep time for messages */
102#define DAYS	*24*60*60	/* seconds/day */
103#define MSGSRC	".msgsrc"	/* user's rc file */
104#define BOUNDS	"bounds"	/* message bounds file */
105#define NEXT	"Next message? [yq]"
106#define MORE	"More? [ynq]"
107#define NOMORE	"(No more) [q] ?"
108
109typedef	char	bool;
110
111FILE		*msgsrc;
112FILE		*newmsg;
113const char	*sep = "-";
114char		inbuf[BUFSIZ];
115char		fname[MAXPATHLEN];
116char		cmdbuf[MAXPATHLEN + MAXPATHLEN];
117char		subj[128];
118char		from[128];
119char		date[128];
120char		*ptr;
121char		*in;
122bool		local;
123bool		ruptible;
124bool		totty;
125bool		seenfrom;
126bool		seensubj;
127bool		blankline;
128bool		printing = NO;
129bool		mailing = NO;
130bool		quitit = NO;
131bool		sending = NO;
132bool		intrpflg = NO;
133int		uid;
134int		msg;
135int		prevmsg;
136int		lct;
137int		nlines;
138int		Lpp = 0;
139time_t		t;
140time_t		keep;
141
142/* option initialization */
143bool	hdrs = NO;
144bool	qopt = NO;
145bool	hush = NO;
146bool	send_msg = NO;
147bool	locomode = NO;
148bool	use_pager = NO;
149bool	clean = NO;
150bool	lastcmd = NO;
151jmp_buf	tstpbuf;
152
153
154void		ask __P((const char *));
155void		gfrsub __P((FILE *));
156int		linecnt __P((FILE *));
157int		main __P((int, char *[]));
158int		next __P((char *));
159char		*nxtfld __P((unsigned char *));
160void		onsusp __P((int));
161void		onintr __P((int));
162void		prmesg __P((int));
163static void	usage __P((void));
164
165int
166main(argc, argv)
167int argc; char *argv[];
168{
169	bool newrc, already;
170	int rcfirst = 0;		/* first message to print (from .rc) */
171	int rcback = 0;			/* amount to back off of rcfirst */
172	int firstmsg = 0, nextmsg = 0, lastmsg = 0;
173	int blast = 0;
174	struct stat buf;		/* stat to check access of bounds */
175	FILE *bounds;
176
177#ifdef UNBUFFERED
178	setbuf(stdout, NULL);
179#endif
180	setlocale(LC_ALL, "");
181
182	time(&t);
183	setuid(uid = getuid());
184	ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
185	if (ruptible)
186		signal(SIGINT, SIG_DFL);
187
188	argc--, argv++;
189	while (argc > 0) {
190		if (isdigit(argv[0][0])) {	/* starting message # */
191			rcfirst = atoi(argv[0]);
192		}
193		else if (isdigit(argv[0][1])) {	/* backward offset */
194			rcback = atoi( &( argv[0][1] ) );
195		}
196		else {
197			ptr = *argv;
198			while (*ptr) switch (*ptr++) {
199
200			case '-':
201				break;
202
203			case 'c':
204				if (uid != SUPERUSER && uid != DAEMON) {
205					fprintf(stderr, "Sorry\n");
206					exit(1);
207				}
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			case 'X':
544				exit(0);
545
546			case 'q':
547			case 'Q':
548				quitit = YES;
549				printf("--Postponed--\n");
550				exit(0);
551				/* intentional fall-thru */
552			case 'n':
553			case 'N':
554				if (msg >= nextmsg) sep = "Flushed";
555				prevmsg = msg;
556				break;
557
558			case 'p':
559			case 'P':
560				use_pager = (*in++ == 'p');
561				/* intentional fallthru */
562			case '\n':
563			case 'y':
564			default:
565				if (*in == '-') {
566					msg = prevmsg-1;
567					sep = "replay";
568					break;
569				}
570				if (isdigit(*in)) {
571					msg = next(in);
572					sep = in;
573					break;
574				}
575
576				prmesg(nlines + lct + (seensubj? 1 : 0));
577				prevmsg = msg;
578
579		}
580
581		printf("--%s--\n", sep);
582		sep = "-";
583		if (msg >= nextmsg) {
584			nextmsg = msg + 1;
585			rewind(msgsrc);
586			fprintf(msgsrc, "%d\n", nextmsg);
587			fflush(msgsrc);
588		}
589		if (newmsg)
590			fclose(newmsg);
591		if (quitit)
592			break;
593	}
594
595	/*
596	 * Make sure .rc file gets updated
597	 */
598	if (--msg >= nextmsg) {
599		nextmsg = msg + 1;
600		rewind(msgsrc);
601		fprintf(msgsrc, "%d\n", nextmsg);
602		fflush(msgsrc);
603	}
604	if (already && !quitit && lastcmd && totty) {
605		/*
606		 * save or reply to last message?
607		 */
608		msg = prevmsg;
609		ask(NOMORE);
610		if (inbuf[0] == '-' || isdigit(inbuf[0]))
611			goto cmnd;
612	}
613	if (!(already || hush || qopt))
614		printf("No new messages.\n");
615	exit(0);
616}
617
618static void
619usage()
620{
621	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
622	exit(1);
623}
624
625void
626prmesg(length)
627int length;
628{
629	FILE *outf;
630	char *env_pager;
631
632	if (use_pager && length > Lpp) {
633		signal(SIGPIPE, SIG_IGN);
634		signal(SIGQUIT, SIG_IGN);
635		if ((env_pager = getenv("PAGER")) == NULL) {
636			snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
637		} else {
638			snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
639		}
640		outf = popen(cmdbuf, "w");
641		if (!outf)
642			outf = stdout;
643		else
644			setbuf(outf, (char *)NULL);
645	}
646	else
647		outf = stdout;
648
649	if (seensubj)
650		putc('\n', outf);
651
652	while (fgets(inbuf, sizeof inbuf, newmsg)) {
653		fputs(inbuf, outf);
654		if (ferror(outf)) {
655			clearerr(outf);
656			break;
657		}
658	}
659
660	if (outf != stdout) {
661		pclose(outf);
662		signal(SIGPIPE, SIG_DFL);
663		signal(SIGQUIT, SIG_DFL);
664	}
665	else {
666		fflush(stdout);
667	}
668
669	/* force wait on output */
670	tcdrain(fileno(stdout));
671}
672
673void
674onintr(unused)
675	int unused __unused;
676{
677	signal(SIGINT, onintr);
678	if (mailing)
679		unlink(fname);
680	if (sending) {
681		unlink(fname);
682		puts("--Killed--");
683		exit(1);
684	}
685	if (printing) {
686		putchar('\n');
687		if (hdrs)
688			exit(0);
689		sep = "Interrupt";
690		if (newmsg)
691			fseeko(newmsg, (off_t)0, SEEK_END);
692		intrpflg = YES;
693	}
694}
695
696/*
697 * We have just gotten a susp.  Suspend and prepare to resume.
698 */
699void
700onsusp(unused)
701	int unused __unused;
702{
703	signal(SIGTSTP, SIG_DFL);
704	sigsetmask(0);
705	kill(0, SIGTSTP);
706	signal(SIGTSTP, onsusp);
707	if (!mailing)
708		longjmp(tstpbuf, 0);
709}
710
711int
712linecnt(f)
713FILE *f;
714{
715	off_t oldpos = ftello(f);
716	int l = 0;
717	char lbuf[BUFSIZ];
718
719	while (fgets(lbuf, sizeof lbuf, f))
720		l++;
721	clearerr(f);
722	fseeko(f, oldpos, SEEK_SET);
723	return (l);
724}
725
726int
727next(buf)
728char *buf;
729{
730	int i;
731	sscanf(buf, "%d", &i);
732	sprintf(buf, "Goto %d", i);
733	return(--i);
734}
735
736void
737ask(prompt)
738const 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] = NULL;
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
823void
824gfrsub(infile)
825FILE *infile;
826{
827	off_t frompos;
828	int count;
829
830	seensubj = seenfrom = NO;
831	local = YES;
832	subj[0] = from[0] = date[0] = NULL;
833
834	/*
835	 * Is this a normal message?
836	 */
837	if (fgets(inbuf, sizeof inbuf, infile)) {
838		if (strncmp(inbuf, "From", 4)==0) {
839			/*
840			 * expected form starts with From
841			 */
842			seenfrom = YES;
843			frompos = ftello(infile);
844			ptr = from;
845			in = nxtfld(inbuf);
846			if (*in) {
847				count = sizeof(from) - 1;
848				while (*in && *in > ' ' && count-- > 0) {
849					if (*in == ':' || *in == '@' ||
850					    *in == '!')
851						local = NO;
852					*ptr++ = *in++;
853				}
854			}
855			*ptr = NULL;
856			if (*(in = nxtfld(in)))
857				strncpy(date, in, sizeof date);
858			else {
859				date[0] = '\n';
860				date[1] = NULL;
861			}
862		}
863		else {
864			/*
865			 * not the expected form
866			 */
867			rewind(infile);
868			return;
869		}
870	}
871	else
872		/*
873		 * empty file ?
874		 */
875		return;
876
877	/*
878	 * look for Subject line until EOF or a blank line
879	 */
880	while (fgets(inbuf, sizeof inbuf, infile)
881	    && !(blankline = (inbuf[0] == '\n'))) {
882		/*
883		 * extract Subject line
884		 */
885		if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
886			seensubj = YES;
887			frompos = ftello(infile);
888			strncpy(subj, nxtfld(inbuf), sizeof subj);
889		}
890	}
891	if (!blankline)
892		/*
893		 * ran into EOF
894		 */
895		fseeko(infile, frompos, SEEK_SET);
896
897	if (!seensubj)
898		/*
899		 * for possible use with Mail
900		 */
901		strncpy(subj, "(No Subject)\n", sizeof subj);
902}
903
904char *
905nxtfld(s)
906unsigned 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