[unix-history] / usr.sbin / sendmail / rmail / rmail.c

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)rmail.c	8.1 (Berkeley) 5/31/93";
#endif /* not lint */

/*
 * RMAIL -- UUCP mail server.
 *
 * This program reads the >From ... remote from ... lines that UUCP is so
 * fond of and turns them into something reasonable.  It then execs sendmail
 * with various options built from these lines. 
 *
 * The expected syntax is:
 *
 *	 <user> := [-a-z0-9]+
 *	 <date> := ctime format
 *	 <site> := [-a-z0-9!]+
 * <blank line> := "^\n$"
 *	 <from> := "From" <space> <user> <space> <date>
 *		  [<space> "remote from" <space> <site>]
 *    <forward> := ">" <from>
 *	    msg := <from> <forward>* <blank-line> <body>
 *
 * The output of rmail(8) compresses the <forward> lines into a single
 * from path.
 *
 * The err(3) routine is included here deliberately to make this code
 * a bit more portable.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <ctype.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

void err __P((int, const char *, ...));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	extern char *optarg;
	extern int errno, optind;
	FILE *fp;
	struct stat sb;
	size_t fplen, fptlen, len;
	off_t offset;
	int ch, debug, i, pdes[2], pid, status;
	char *addrp, *domain, *p, *t;
	char *from_path, *from_sys, *from_user;
	char *args[100], buf[2048], lbuf[2048];

	debug = 0;
	domain = "UUCP";		/* Default "domain". */
	while ((ch = getopt(argc, argv, "D:T")) != EOF)
		switch (ch) {
		case 'T':
			debug = 1;
			break;
		case 'D':
			domain = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 1)
		usage();

	from_path = from_sys = from_user = NULL;
	for (offset = 0;;) {

		/* Get and nul-terminate the line. */
		if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
			exit (EX_DATAERR);
		if ((p = strchr(lbuf, '\n')) == NULL)
			err(EX_DATAERR, "line too long");
		*p = '\0';

		/* Parse lines until reach a non-"From" line. */
		if (!strncmp(lbuf, "From ", 5))
			addrp = lbuf + 5;
		else if (!strncmp(lbuf, ">From ", 6))
			addrp = lbuf + 6;
		else if (offset == 0)
			err(EX_DATAERR,
			    "missing or empty From line: %s", lbuf);
		else {
			*p = '\n';
			break;
		}

		if (*addrp == '\0')
			err(EX_DATAERR, "corrupted From line: %s", lbuf);

		/* Use the "remote from" if it exists. */
		for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;)
			if (!strncmp(p, "remote from ", 12)) {
				for (t = p += 12; *t && !isspace(*t); ++t);
				*t = '\0';
				if (debug)
					(void)fprintf(stderr,
					    "remote from: %s\n", p);
				break;
			}

		/* Else use the string up to the last bang. */
		if (p == NULL)
			if (*addrp == '!')
				err(EX_DATAERR,
				    "bang starts address: %s", addrp);
			else if ((t = strrchr(addrp, '!')) != NULL) {
				*t = '\0';
				p = addrp;
				addrp = t + 1;
				if (*addrp == '\0')
					err(EX_DATAERR,
					    "corrupted From line: %s", lbuf);
				if (debug)
					(void)fprintf(stderr, "bang: %s\n", p);
			}

		/* 'p' now points to any system string from this line. */
		if (p != NULL) {
			/* Nul terminate it as necessary. */
			for (t = p; *t && !isspace(*t); ++t);
			*t = '\0';

			/* If the first system, copy to the from_sys string. */
			if (from_sys == NULL) {
				if ((from_sys = strdup(p)) == NULL)
					err(EX_TEMPFAIL, NULL);
				if (debug)
					(void)fprintf(stderr,
					    "from_sys: %s\n", from_sys);
			}

			/* Concatenate to the path string. */
			len = t - p;
			if (from_path == NULL) {
				fplen = 0;
				if ((from_path = malloc(fptlen = 256)) == NULL)
					err(EX_TEMPFAIL, NULL);
			}
			if (fplen + len + 2 > fptlen) {
				fptlen += MAX(fplen + len + 2, 256);
				if ((from_path =
				    realloc(from_path, fptlen)) == NULL)
					err(EX_TEMPFAIL, NULL);
			}
			memmove(from_path + fplen, p, len);
			fplen += len;
			from_path[fplen++] = '!';
			from_path[fplen] = '\0';
		}

		/* Save off from user's address; the last one wins. */
		for (p = addrp; *p && !isspace(*p); ++p);
		*p = '\0';
		if (from_user != NULL)
			free(from_user);
		if ((from_user = strdup(addrp)) == NULL)
			err(EX_TEMPFAIL, NULL);

		if (debug) {
			if (from_path != NULL)
				(void)fprintf(stderr,
				    "from_path: %s\n", from_path);
			(void)fprintf(stderr, "from_user: %s\n", from_user);
		}

		if (offset != -1)
			offset = (off_t)ftell(stdin);
	}

	i = 0;
	args[i++] = _PATH_SENDMAIL;	/* Build sendmail's argument list. */
	args[i++] = "-oee";		/* No errors, just status. */
	args[i++] = "-odq";		/* Queue it, don't try to deliver. */
	args[i++] = "-oi";		/* Ignore '.' on a line by itself. */

	if (from_sys != NULL) {		/* Set sender's host name. */
		if (strchr(from_sys, '.') == NULL)
			(void)snprintf(buf, sizeof(buf),
			    "-oMs%s.%s", from_sys, domain);
		else
			(void)snprintf(buf, sizeof(buf), "-oMs%s", from_sys);
		if ((args[i++] = strdup(buf)) == NULL)
			 err(EX_TEMPFAIL, NULL);
	}
					/* Set protocol used. */
	(void)snprintf(buf, sizeof(buf), "-oMr%s", domain);
	if ((args[i++] = strdup(buf)) == NULL)
		err(EX_TEMPFAIL, NULL);

					/* Set name of ``from'' person. */
	(void)snprintf(buf, sizeof(buf), "-f%s%s",
	    from_path ? from_path : "", from_user);
	if ((args[i++] = strdup(buf)) == NULL)
		err(EX_TEMPFAIL, NULL);

	/*
	 * Don't copy arguments beginning with - as they will be
	 * passed to sendmail and could be interpreted as flags.
	 */
	do {
		if (*argv && **argv == '-')
			err(EX_USAGE, "dash precedes argument: %s", *argv);
	} while ((args[i++] = *argv++) != NULL);

	if (debug) {
		(void)fprintf(stderr, "Sendmail arguments:\n");
		for (i = 0; args[i]; i++)
			(void)fprintf(stderr, "\t%s\n", args[i]);
	}

	/*
	 * If called with a regular file as standard input, seek to the right
	 * position in the file and just exec sendmail.  Could probably skip
	 * skip the stat, but it's not unreasonable to believe that a failed
	 * seek will cause future reads to fail.
	 */
	if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) {
		if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
			err(EX_TEMPFAIL, "stdin seek");
		execv(_PATH_SENDMAIL, args);
		err(EX_OSERR, "%s", _PATH_SENDMAIL);
	}

	if (pipe(pdes) < 0)
		err(EX_OSERR, NULL);

	switch (pid = vfork()) {
	case -1:				/* Err. */
		err(EX_OSERR, NULL);
	case 0:					/* Child. */
		if (pdes[0] != STDIN_FILENO) {
			(void)dup2(pdes[0], STDIN_FILENO);
			(void)close(pdes[0]);
		}
		(void)close(pdes[1]);
		execv(_PATH_SENDMAIL, args);
		_exit(127);
		/* NOTREACHED */
	}

	if ((fp = fdopen(pdes[1], "w")) == NULL)
		err(EX_OSERR, NULL);
	(void)close(pdes[0]);

	/* Copy the file down the pipe. */
	do {
		(void)fprintf(fp, "%s", lbuf);
	} while (fgets(lbuf, sizeof(lbuf), stdin) != NULL);

	if (ferror(stdin))
		err(EX_TEMPFAIL, "stdin: %s", strerror(errno));

	if (fclose(fp))
		err(EX_OSERR, NULL);

	if ((waitpid(pid, &status, 0)) == -1)
		err(EX_OSERR, "%s", _PATH_SENDMAIL);

	if (!WIFEXITED(status))
		err(EX_OSERR,
		    "%s: did not terminate normally", _PATH_SENDMAIL);

	if (WEXITSTATUS(status))
		err(status, "%s: terminated with %d (non-zero) status",
		    _PATH_SENDMAIL, WEXITSTATUS(status));
	exit(EX_OK);
}

void
usage()
{
	(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
	exit(EX_USAGE);
}

#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#ifdef __STDC__
err(int eval, const char *fmt, ...)
#else
err(eval, fmt, va_alist)
	int eval;
	const char *fmt;
	va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "rmail: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(eval);
}
Commit	Line	Data
78ed81a3	1	/*
	2	* Copyright (c) 1988, 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
	35	static char copyright[] =
	36	"@(#) Copyright (c) 1988, 1993\n\
	37	The Regents of the University of California. All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	static char sccsid[] = "@(#)rmail.c 8.1 (Berkeley) 5/31/93";
	42	#endif /* not lint */
	43
	44	/*
	45	* RMAIL -- UUCP mail server.
	46	*
	47	* This program reads the >From ... remote from ... lines that UUCP is so
	48	* fond of and turns them into something reasonable. It then execs sendmail
	49	* with various options built from these lines.
	50	*
	51	* The expected syntax is:
	52	*
	53	* <user> := [-a-z0-9]+
	54	* <date> := ctime format
	55	* <site> := [-a-z0-9!]+
	56	* <blank line> := "^\n$"
	57	* <from> := "From" <space> <user> <space> <date>
	58	* [<space> "remote from" <space> <site>]
	59	* <forward> := ">" <from>
	60	* msg := <from> <forward>* <blank-line> <body>
	61	*
	62	* The output of rmail(8) compresses the <forward> lines into a single
	63	* from path.
	64	*
65	* The err(3) routine is included here deliberately to make this code
66	* a bit more portable.
67	*/
68	#include <sys/param.h>
69	#include <sys/stat.h>
70	#include <sys/wait.h>
71
72	#include <ctype.h>
73	#include <fcntl.h>
74	#include <paths.h>
75	#include <stdio.h>
76	#include <stdlib.h>
77	#include <string.h>
78	#include <sysexits.h>
79	#include <unistd.h>
80
81	void err __P((int, const char *, ...));
82	void usage __P((void));
83
84	int
85	main(argc, argv)
86	int argc;
87	char *argv[];
88	{
89	extern char *optarg;
90	extern int errno, optind;
91	FILE *fp;
92	struct stat sb;
93	size_t fplen, fptlen, len;
94	off_t offset;
95	int ch, debug, i, pdes[2], pid, status;
96	char addrp, domain, p, t;
97	char from_path, from_sys, *from_user;
98	char *args[100], buf[2048], lbuf[2048];
99
100	debug = 0;
101	domain = "UUCP"; /* Default "domain". */
102	while ((ch = getopt(argc, argv, "D:T")) != EOF)
103	switch (ch) {
104	case 'T':
105	debug = 1;
106	break;
107	case 'D':
108	domain = optarg;
109	break;
110	case '?':
111	default:
112	usage();
113	}
114	argc -= optind;
115	argv += optind;
116
117	if (argc < 1)
118	usage();
119
120	from_path = from_sys = from_user = NULL;
121	for (offset = 0;;) {
122
123	/* Get and nul-terminate the line. */
124	if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
125	exit (EX_DATAERR);
126	if ((p = strchr(lbuf, '\n')) == NULL)
127	err(EX_DATAERR, "line too long");
128	*p = '\0';
129
130	/* Parse lines until reach a non-"From" line. */
131	if (!strncmp(lbuf, "From ", 5))
132	addrp = lbuf + 5;
133	else if (!strncmp(lbuf, ">From ", 6))
134	addrp = lbuf + 6;
135	else if (offset == 0)
136	err(EX_DATAERR,
137	"missing or empty From line: %s", lbuf);
138	else {
139	*p = '\n';
140	break;
141	}
142
143	if (*addrp == '\0')
144	err(EX_DATAERR, "corrupted From line: %s", lbuf);
145
146	/* Use the "remote from" if it exists. */
147	for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;)
148	if (!strncmp(p, "remote from ", 12)) {
149	for (t = p += 12; t && !isspace(t); ++t);
150	*t = '\0';
151	if (debug)
152	(void)fprintf(stderr,
153	"remote from: %s\n", p);
154	break;
155	}
156
157	/* Else use the string up to the last bang. */
158	if (p == NULL)
159	if (*addrp == '!')
160	err(EX_DATAERR,
161	"bang starts address: %s", addrp);
162	else if ((t = strrchr(addrp, '!')) != NULL) {
163	*t = '\0';
164	p = addrp;
165	addrp = t + 1;
166	if (*addrp == '\0')
167	err(EX_DATAERR,
168	"corrupted From line: %s", lbuf);
169	if (debug)
170	(void)fprintf(stderr, "bang: %s\n", p);
171	}
172
173	/* 'p' now points to any system string from this line. */
174	if (p != NULL) {
175	/* Nul terminate it as necessary. */
176	for (t = p; t && !isspace(t); ++t);
177	*t = '\0';
178
179	/* If the first system, copy to the from_sys string. */
180	if (from_sys == NULL) {
181	if ((from_sys = strdup(p)) == NULL)
182	err(EX_TEMPFAIL, NULL);
183	if (debug)
184	(void)fprintf(stderr,
185	"from_sys: %s\n", from_sys);
186	}
187
188	/* Concatenate to the path string. */
189	len = t - p;
190	if (from_path == NULL) {
191	fplen = 0;
192	if ((from_path = malloc(fptlen = 256)) == NULL)
193	err(EX_TEMPFAIL, NULL);
194	}
195	if (fplen + len + 2 > fptlen) {
196	fptlen += MAX(fplen + len + 2, 256);
197	if ((from_path =
198	realloc(from_path, fptlen)) == NULL)
199	err(EX_TEMPFAIL, NULL);
200	}
201	memmove(from_path + fplen, p, len);
202	fplen += len;
203	from_path[fplen++] = '!';
204	from_path[fplen] = '\0';
205	}
206
207	/* Save off from user's address; the last one wins. */
208	for (p = addrp; p && !isspace(p); ++p);
209	*p = '\0';
210	if (from_user != NULL)
211	free(from_user);
212	if ((from_user = strdup(addrp)) == NULL)
213	err(EX_TEMPFAIL, NULL);
214
215	if (debug) {
216	if (from_path != NULL)
217	(void)fprintf(stderr,
218	"from_path: %s\n", from_path);
219	(void)fprintf(stderr, "from_user: %s\n", from_user);
220	}
221
222	if (offset != -1)
223	offset = (off_t)ftell(stdin);
224	}
225
226	i = 0;
227	args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */
228	args[i++] = "-oee"; /* No errors, just status. */
229	args[i++] = "-odq"; /* Queue it, don't try to deliver. */
230	args[i++] = "-oi"; /* Ignore '.' on a line by itself. */
231
232	if (from_sys != NULL) { /* Set sender's host name. */
233	if (strchr(from_sys, '.') == NULL)
234	(void)snprintf(buf, sizeof(buf),
235	"-oMs%s.%s", from_sys, domain);
236	else
237	(void)snprintf(buf, sizeof(buf), "-oMs%s", from_sys);
238	if ((args[i++] = strdup(buf)) == NULL)
239	err(EX_TEMPFAIL, NULL);
240	}
241	/* Set protocol used. */
242	(void)snprintf(buf, sizeof(buf), "-oMr%s", domain);
243	if ((args[i++] = strdup(buf)) == NULL)
244	err(EX_TEMPFAIL, NULL);
245
246	/* Set name of ``from'' person. */
247	(void)snprintf(buf, sizeof(buf), "-f%s%s",
248	from_path ? from_path : "", from_user);
249	if ((args[i++] = strdup(buf)) == NULL)
250	err(EX_TEMPFAIL, NULL);
251
252	/*
253	* Don't copy arguments beginning with - as they will be
254	* passed to sendmail and could be interpreted as flags.
255	*/
256	do {
257	if (argv && *argv == '-')
258	err(EX_USAGE, "dash precedes argument: %s", *argv);
259	} while ((args[i++] = *argv++) != NULL);
260
261	if (debug) {
262	(void)fprintf(stderr, "Sendmail arguments:\n");
263	for (i = 0; args[i]; i++)
264	(void)fprintf(stderr, "\t%s\n", args[i]);
265	}
266
267	/*
268	* If called with a regular file as standard input, seek to the right
269	* position in the file and just exec sendmail. Could probably skip
270	* skip the stat, but it's not unreasonable to believe that a failed
271	* seek will cause future reads to fail.
272	*/
273	if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) {
274	if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
275	err(EX_TEMPFAIL, "stdin seek");
276	execv(_PATH_SENDMAIL, args);
277	err(EX_OSERR, "%s", _PATH_SENDMAIL);
278	}
279
280	if (pipe(pdes) < 0)
281	err(EX_OSERR, NULL);
282
283	switch (pid = vfork()) {
284	case -1: /* Err. */
285	err(EX_OSERR, NULL);
286	case 0: /* Child. */
287	if (pdes[0] != STDIN_FILENO) {
288	(void)dup2(pdes[0], STDIN_FILENO);
289	(void)close(pdes[0]);
290	}
291	(void)close(pdes[1]);
292	execv(_PATH_SENDMAIL, args);
293	_exit(127);
294	/* NOTREACHED */
295	}
296
297	if ((fp = fdopen(pdes[1], "w")) == NULL)
298	err(EX_OSERR, NULL);
299	(void)close(pdes[0]);
300
301	/* Copy the file down the pipe. */
302	do {
303	(void)fprintf(fp, "%s", lbuf);
304	} while (fgets(lbuf, sizeof(lbuf), stdin) != NULL);
305
306	if (ferror(stdin))
307	err(EX_TEMPFAIL, "stdin: %s", strerror(errno));
308
309	if (fclose(fp))
310	err(EX_OSERR, NULL);
311
312	if ((waitpid(pid, &status, 0)) == -1)
313	err(EX_OSERR, "%s", _PATH_SENDMAIL);
314
315	if (!WIFEXITED(status))
316	err(EX_OSERR,
317	"%s: did not terminate normally", _PATH_SENDMAIL);
318
319	if (WEXITSTATUS(status))
320	err(status, "%s: terminated with %d (non-zero) status",
321	_PATH_SENDMAIL, WEXITSTATUS(status));
322	exit(EX_OK);
323	}
324
325	void
326	usage()
327	{
328	(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
329	exit(EX_USAGE);
330	}
331
332	#ifdef __STDC__
333	#include <stdarg.h>
334	#else
335	#include <varargs.h>
336	#endif
337
338	void
339	#ifdef __STDC__
340	err(int eval, const char *fmt, ...)
341	#else
342	err(eval, fmt, va_alist)
343	int eval;
344	const char *fmt;
345	va_dcl
346	#endif
347	{
348	va_list ap;
349	#if __STDC__
350	va_start(ap, fmt);
351	#else
352	va_start(ap);
353	#endif
354	(void)fprintf(stderr, "rmail: ");
355	(void)vfprintf(stderr, fmt, ap);
356	va_end(ap);
357	(void)fprintf(stderr, "\n");
358	exit(eval);
359	}