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 */ 33 34 #include <sys/param.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <pwd.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <paths.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 static int match(char *, char *); 46 static void usage(void); 47 48 int 49 main(int argc, char **argv) 50 { 51 struct passwd *pwd; 52 int ch, count, newline; 53 const char *file; 54 char *sender, *p; 55 #if MAXPATHLEN > BUFSIZ 56 char buf[MAXPATHLEN]; 57 #else 58 char buf[BUFSIZ]; 59 #endif 60 61 file = sender = NULL; 62 count = -1; 63 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 64 switch (ch) { 65 case 'c': 66 count = 0; 67 break; 68 case 'f': 69 file = optarg; 70 break; 71 case 's': 72 sender = optarg; 73 for (p = sender; *p; ++p) 74 *p = tolower(*p); 75 break; 76 case '?': 77 default: 78 usage(); 79 } 80 argv += optind; 81 82 if (file == NULL) { 83 if (*argv) { 84 snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 85 file = buf; 86 } else { 87 if ((file = getenv("MAIL")) == NULL) { 88 if (!(pwd = getpwuid(getuid()))) 89 errx(1, "no password file entry for you"); 90 file = pwd->pw_name; 91 snprintf(buf, sizeof(buf), 92 "%s/%s", _PATH_MAILDIR, file); 93 file = buf; 94 } 95 } 96 } 97 98 /* read from stdin */ 99 if (strcmp(file, "-") == 0) { 100 } 101 else if (freopen(file, "r", stdin) == NULL) { 102 err(1, "can't read %s", file); 103 } 104 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 105 if (*buf == '\n') { 106 newline = 1; 107 continue; 108 } 109 if (newline && !strncmp(buf, "From ", 5) && 110 (!sender || match(buf + 5, sender))) { 111 if (count != -1) 112 count++; 113 else 114 printf("%s", buf); 115 } 116 newline = 0; 117 } 118 if (count != -1) 119 printf("There %s %d message%s in your incoming mailbox.\n", 120 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 121 exit(0); 122 } 123 124 static void 125 usage(void) 126 { 127 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 128 exit(1); 129 } 130 131 static int 132 match(char *line, char *sender) 133 { 134 char ch, pch, first, *p, *t; 135 136 for (first = *sender++;;) { 137 if (isspace(ch = *line)) 138 return(0); 139 ++line; 140 ch = tolower(ch); 141 if (ch != first) 142 continue; 143 for (p = sender, t = line;;) { 144 if (!(pch = *p++)) 145 return(1); 146 ch = tolower(*t++); 147 if (ch != pch) 148 break; 149 } 150 } 151 /* NOTREACHED */ 152 } 153