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