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from.c revision 1.8 
      1 /*	$NetBSD: from.c,v 1.8 1997/10/18 15:08:53 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)from.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: from.c,v 1.8 1997/10/18 15:08:53 lukem Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 #include <ctype.h>
     51 #include <paths.h>
     52 #include <pwd.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 int	main __P((int, char **));
     59 int	match __P((char *, char *));
     60 
     61 int
     62 main(argc, argv)
     63 	int argc;
     64 	char **argv;
     65 {
     66 	struct passwd *pwd;
     67 	int ch, newline;
     68 	char *file, *sender, *p;
     69 #if MAXPATHLEN > BUFSIZ
     70 	char buf[MAXPATHLEN];
     71 #else
     72 	char buf[BUFSIZ];
     73 #endif
     74 
     75 	file = sender = NULL;
     76 	while ((ch = getopt(argc, argv, "f:s:")) != -1)
     77 		switch((char)ch) {
     78 		case 'f':
     79 			file = optarg;
     80 			break;
     81 		case 's':
     82 			sender = optarg;
     83 			for (p = sender; *p; ++p)
     84 				if (isupper(*p))
     85 					*p = tolower(*p);
     86 			break;
     87 		case '?':
     88 		default:
     89 			fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
     90 			exit(1);
     91 		}
     92 	argv += optind;
     93 
     94 	/*
     95 	 * We find the mailbox by:
     96 	 *	1 -f flag
     97 	 *	2 user
     98 	 *	2 MAIL environment variable
     99 	 *	3 _PATH_MAILDIR/file
    100 	 */
    101 	if (!file) {
    102 		if (!(file = *argv)) {
    103 			if (!(file = getenv("MAIL"))) {
    104 				if (!(pwd = getpwuid(getuid()))) {
    105 					(void)fprintf(stderr,
    106 				"from: no password file entry for you.\n");
    107 					exit(1);
    108 				}
    109 				if ((file = getenv("USER")) != NULL) {
    110 					(void)sprintf(buf, "%s/%s",
    111 					    _PATH_MAILDIR, file);
    112 					file = buf;
    113 				} else
    114 					(void)sprintf(file = buf, "%s/%s",
    115 					    _PATH_MAILDIR, pwd->pw_name);
    116 			}
    117 		} else {
    118 			(void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file);
    119 			file = buf;
    120 		}
    121 	}
    122 	if (!freopen(file, "r", stdin)) {
    123 		(void)fprintf(stderr, "from: can't read %s.\n", file);
    124 		exit(1);
    125 	}
    126 	for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
    127 		if (*buf == '\n') {
    128 			newline = 1;
    129 			continue;
    130 		}
    131 		if (newline && !strncmp(buf, "From ", 5) &&
    132 		    (!sender || match(buf + 5, sender)))
    133 			printf("%s", buf);
    134 		newline = 0;
    135 	}
    136 	exit(0);
    137 }
    138 
    139 int
    140 match(line, sender)
    141 	char *line, *sender;
    142 {
    143 	char ch, pch, first, *p, *t;
    144 
    145 	for (first = *sender++;;) {
    146 		if (isspace(ch = *line))
    147 			return(0);
    148 		++line;
    149 		if (isupper(ch))
    150 			ch = tolower(ch);
    151 		if (ch != first)
    152 			continue;
    153 		for (p = sender, t = line;;) {
    154 			if (!(pch = *p++))
    155 				return(1);
    156 			if (isupper(ch = *t++))
    157 				ch = tolower(ch);
    158 			if (ch != pch)
    159 				break;
    160 		}
    161 	}
    162 	/* NOTREACHED */
    163 }
    164