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 1.3 2003/10/04 20:36:44 hmp Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <ctype.h> 41 #include <err.h> 42 #include <pwd.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <paths.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 int match(char *, char *); 50 static void usage(void); 51 52 int 53 main(int argc, char **argv) 54 { 55 struct passwd *pwd; 56 int ch, count, newline; 57 char *file, *sender, *p; 58 #if MAXPATHLEN > BUFSIZ 59 char buf[MAXPATHLEN]; 60 #else 61 char buf[BUFSIZ]; 62 #endif 63 64 file = sender = NULL; 65 count = -1; 66 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 67 switch (ch) { 68 case 'c': 69 count = 0; 70 break; 71 case 'f': 72 file = optarg; 73 break; 74 case 's': 75 sender = optarg; 76 for (p = sender; *p; ++p) 77 if (isupper(*p)) 78 *p = tolower(*p); 79 break; 80 case '?': 81 default: 82 usage(); 83 } 84 argv += optind; 85 86 if (!file) { 87 if (*argv) { 88 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 89 file = buf; 90 } else { 91 if (!(file = getenv("MAIL"))) { 92 if (!(pwd = getpwuid(getuid()))) 93 errx(1, "no password file entry for you"); 94 file = pwd->pw_name; 95 (void)snprintf(buf, sizeof(buf), 96 "%s/%s", _PATH_MAILDIR, file); 97 file = buf; 98 } 99 } 100 } 101 102 /* read from stdin */ 103 if (strcmp(file, "-") == 0) { 104 } 105 else if (!freopen(file, "r", stdin)) { 106 errx(1, "can't read %s", file); 107 } 108 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 109 if (*buf == '\n') { 110 newline = 1; 111 continue; 112 } 113 if (newline && !strncmp(buf, "From ", 5) && 114 (!sender || match(buf + 5, sender))) { 115 if (count != -1) 116 count++; 117 else 118 printf("%s", buf); 119 } 120 newline = 0; 121 } 122 if (count != -1) 123 printf("There %s %d message%s in your incoming mailbox.\n", 124 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 125 exit(0); 126 } 127 128 static void 129 usage(void) 130 { 131 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 132 exit(1); 133 } 134 135 int 136 match(register char *line, register char *sender) 137 { 138 register char ch, pch, first, *p, *t; 139 140 for (first = *sender++;;) { 141 if (isspace(ch = *line)) 142 return(0); 143 ++line; 144 if (isupper(ch)) 145 ch = tolower(ch); 146 if (ch != first) 147 continue; 148 for (p = sender, t = line;;) { 149 if (!(pch = *p++)) 150 return(1); 151 if (isupper(ch = *t++)) 152 ch = tolower(ch); 153 if (ch != pch) 154 break; 155 } 156 } 157 /* NOTREACHED */ 158 } 159