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