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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1988, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)from.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: src/usr.bin/from/from.c,v 1.8.2.1 2000/10/06 08:19:19 ru Exp $ 32 * $DragonFly: src/usr.bin/from/from.c,v 1.5 2005/04/22 15:36:39 liamfoy Exp $ 33 */ 34 35 #include <sys/types.h> 36 37 #include <ctype.h> 38 #include <err.h> 39 #include <pwd.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <paths.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 static int match(char *, char *); 47 static void usage(void); 48 49 int 50 main(int argc, char **argv) 51 { 52 struct passwd *pwd; 53 int ch, count, newline; 54 const char *file; 55 char *sender, *p; 56 #if MAXPATHLEN > BUFSIZ 57 char buf[MAXPATHLEN]; 58 #else 59 char buf[BUFSIZ]; 60 #endif 61 62 file = sender = NULL; 63 count = -1; 64 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 65 switch (ch) { 66 case 'c': 67 count = 0; 68 break; 69 case 'f': 70 file = optarg; 71 break; 72 case 's': 73 sender = optarg; 74 for (p = sender; *p; ++p) 75 *p = tolower(*p); 76 break; 77 case '?': 78 default: 79 usage(); 80 } 81 argv += optind; 82 83 if (file == NULL) { 84 if (*argv) { 85 snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 86 file = buf; 87 } else { 88 if ((file = getenv("MAIL")) == NULL) { 89 if (!(pwd = getpwuid(getuid()))) 90 errx(1, "no password file entry for you"); 91 file = pwd->pw_name; 92 snprintf(buf, sizeof(buf), 93 "%s/%s", _PATH_MAILDIR, file); 94 file = buf; 95 } 96 } 97 } 98 99 /* read from stdin */ 100 if (strcmp(file, "-") == 0) { 101 } 102 else if (freopen(file, "r", stdin) == NULL) { 103 err(1, "can't read %s", file); 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 if (count != -1) 113 count++; 114 else 115 printf("%s", buf); 116 } 117 newline = 0; 118 } 119 if (count != -1) 120 printf("There %s %d message%s in your incoming mailbox.\n", 121 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 122 exit(0); 123 } 124 125 static void 126 usage(void) 127 { 128 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 129 exit(1); 130 } 131 132 static int 133 match(char *line, char *sender) 134 { 135 char ch, pch, first, *p, *t; 136 137 for (first = *sender++;;) { 138 if (isspace(ch = *line)) 139 return(0); 140 ++line; 141 ch = tolower(ch); 142 if (ch != first) 143 continue; 144 for (p = sender, t = line;;) { 145 if (!(pch = *p++)) 146 return(1); 147 ch = tolower(*t++); 148 if (ch != pch) 149 break; 150 } 151 } 152 /* NOTREACHED */ 153 } 154