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 * @(#) Copyright (c) 1980, 1988, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)from.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.bin/from/from.c,v 1.8.2.1 2000/10/06 08:19:19 ru Exp $ 36 * $DragonFly: src/usr.bin/from/from.c,v 1.5 2005/04/22 15:36:39 liamfoy Exp $ 37 */ 38 39 #include <sys/types.h> 40 41 #include <ctype.h> 42 #include <err.h> 43 #include <pwd.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <paths.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 static int match(char *, char *); 51 static void usage(void); 52 53 int 54 main(int argc, char **argv) 55 { 56 struct passwd *pwd; 57 int ch, count, newline; 58 const char *file; 59 char *sender, *p; 60 #if MAXPATHLEN > BUFSIZ 61 char buf[MAXPATHLEN]; 62 #else 63 char buf[BUFSIZ]; 64 #endif 65 66 file = sender = NULL; 67 count = -1; 68 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 69 switch (ch) { 70 case 'c': 71 count = 0; 72 break; 73 case 'f': 74 file = optarg; 75 break; 76 case 's': 77 sender = optarg; 78 for (p = sender; *p; ++p) 79 *p = tolower(*p); 80 break; 81 case '?': 82 default: 83 usage(); 84 } 85 argv += optind; 86 87 if (file == NULL) { 88 if (*argv) { 89 snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 90 file = buf; 91 } else { 92 if ((file = getenv("MAIL")) == NULL) { 93 if (!(pwd = getpwuid(getuid()))) 94 errx(1, "no password file entry for you"); 95 file = pwd->pw_name; 96 snprintf(buf, sizeof(buf), 97 "%s/%s", _PATH_MAILDIR, file); 98 file = buf; 99 } 100 } 101 } 102 103 /* read from stdin */ 104 if (strcmp(file, "-") == 0) { 105 } 106 else if (freopen(file, "r", stdin) == NULL) { 107 err(1, "can't read %s", file); 108 } 109 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 110 if (*buf == '\n') { 111 newline = 1; 112 continue; 113 } 114 if (newline && !strncmp(buf, "From ", 5) && 115 (!sender || match(buf + 5, sender))) { 116 if (count != -1) 117 count++; 118 else 119 printf("%s", buf); 120 } 121 newline = 0; 122 } 123 if (count != -1) 124 printf("There %s %d message%s in your incoming mailbox.\n", 125 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 126 exit(0); 127 } 128 129 static void 130 usage(void) 131 { 132 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 133 exit(1); 134 } 135 136 static int 137 match(char *line, char *sender) 138 { 139 char ch, pch, first, *p, *t; 140 141 for (first = *sender++;;) { 142 if (isspace(ch = *line)) 143 return(0); 144 ++line; 145 ch = tolower(ch); 146 if (ch != first) 147 continue; 148 for (p = sender, t = line;;) { 149 if (!(pch = *p++)) 150 return(1); 151 ch = tolower(*t++); 152 if (ch != pch) 153 break; 154 } 155 } 156 /* NOTREACHED */ 157 } 158