1 /* 2 * Copyright (c) 1980, 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 const char copyright[] = 36 "@(#) Copyright (c) 1980, 1988, 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 42 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 static const char rcsid[] = 45 "$Id$"; 46 #endif /* not lint */ 47 48 #include <sys/types.h> 49 #include <ctype.h> 50 #include <err.h> 51 #include <pwd.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <paths.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 int match __P((char *, char *)); 59 static void usage __P((void)); 60 61 int 62 main(argc, argv) 63 int argc; 64 char **argv; 65 { 66 extern char *optarg; 67 extern int optind; 68 struct passwd *pwd; 69 int ch, newline; 70 char *file, *sender, *p; 71 #if MAXPATHLEN > BUFSIZ 72 char buf[MAXPATHLEN]; 73 #else 74 char buf[BUFSIZ]; 75 #endif 76 77 file = sender = NULL; 78 while ((ch = getopt(argc, argv, "f:s:")) != -1) 79 switch((char)ch) { 80 case 'f': 81 file = optarg; 82 break; 83 case 's': 84 sender = optarg; 85 for (p = sender; *p; ++p) 86 if (isupper(*p)) 87 *p = tolower(*p); 88 break; 89 case '?': 90 default: 91 usage(); 92 } 93 argv += optind; 94 95 if (!file) { 96 if (*argv) { 97 (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, *argv); 98 file = buf; 99 } else { 100 if (!(file = getenv("MAIL"))) { 101 if (!(pwd = getpwuid(getuid()))) 102 errx(1, "no password file entry for you"); 103 file = pwd->pw_name; 104 (void)sprintf(buf, 105 "%s/%s", _PATH_MAILDIR, file); 106 file = buf; 107 } 108 } 109 } 110 111 /* read from stdin */ 112 if (strcmp(file, "-") == 0) { 113 } 114 else if (!freopen(file, "r", stdin)) { 115 errx(1, "can't read %s", file); 116 } 117 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 118 if (*buf == '\n') { 119 newline = 1; 120 continue; 121 } 122 if (newline && !strncmp(buf, "From ", 5) && 123 (!sender || match(buf + 5, sender))) 124 printf("%s", buf); 125 newline = 0; 126 } 127 exit(0); 128 } 129 130 static void 131 usage() 132 { 133 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 134 exit(1); 135 } 136 137 int 138 match(line, sender) 139 register char *line, *sender; 140 { 141 register char ch, pch, first, *p, *t; 142 143 for (first = *sender++;;) { 144 if (isspace(ch = *line)) 145 return(0); 146 ++line; 147 if (isupper(ch)) 148 ch = tolower(ch); 149 if (ch != first) 150 continue; 151 for (p = sender, t = line;;) { 152 if (!(pch = *p++)) 153 return(1); 154 if (isupper(ch = *t++)) 155 ch = tolower(ch); 156 if (ch != pch) 157 break; 158 } 159 } 160 /* NOTREACHED */ 161 } 162