msgs.c revision 140389 
1116874Ssmkelly/*-
2116874Ssmkelly * Copyright (c) 1980, 1993
3117185Ssmkelly *	The Regents of the University of California.  All rights reserved.
4126383Sphk *
5126383Sphk * Redistribution and use in source and binary forms, with or without
6116874Ssmkelly * modification, are permitted provided that the following conditions
7242519Sdelphij * are met:
8242519Sdelphij * 1. Redistributions of source code must retain the above copyright
9126383Sphk *    notice, this list of conditions and the following disclaimer.
10116874Ssmkelly * 2. Redistributions in binary form must reproduce the above copyright
11126383Sphk *    notice, this list of conditions and the following disclaimer in the
12126383Sphk *    documentation and/or other materials provided with the distribution.
13126383Sphk * 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#if 0
41#ifndef lint
42static 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: head/usr.bin/msgs/msgs.c 140389 2005-01-17 17:45:38Z delphij $");
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
154static void	ask(const char *);
155static void	gfrsub(FILE *);
156static int	linecnt(FILE *);
157static int	next(char *);
158static char	*nxtfld(char *);
159static void	onsusp(int);
160static void	onintr(int);
161static void	prmesg(int);
162static void usage(void);
163
164int
165main(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);
537cmnd:
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
624static void
625usage(void)
626{
627	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
628	exit(1);
629}
630
631static void
632prmesg(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
678static void
679onintr(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 */
703static void
704onsusp(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
714static int
715linecnt(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
728static int
729next(char *buf)
730{
731	int i;
732	sscanf(buf, "%d", &i);
733	sprintf(buf, "Goto %d", i);
734	return(--i);
735}
736
737static void
738ask(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
823static void
824gfrsub(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
903static char *
904nxtfld(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