1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <ctype.h> 34 #include <err.h> 35 #include <pwd.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <paths.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 static int match(const char *, const char *); 43 static void usage(void) __dead2; 44 45 int 46 main(int argc, char **argv) 47 { 48 FILE *mbox; 49 struct passwd *pwd; 50 int ch, count, newline; 51 const char *file; 52 char *sender, *p; 53 #if MAXPATHLEN > BUFSIZ 54 char buf[MAXPATHLEN]; 55 #else 56 char buf[BUFSIZ]; 57 #endif 58 59 file = sender = NULL; 60 count = -1; 61 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 62 switch (ch) { 63 case 'c': 64 count = 0; 65 break; 66 case 'f': 67 file = optarg; 68 break; 69 case 's': 70 sender = optarg; 71 for (p = sender; *p; ++p) 72 *p = tolower(*p); 73 break; 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 if (file == NULL) { 82 if (argc) { 83 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 84 file = buf; 85 } else { 86 if (!(file = getenv("MAIL"))) { 87 if (!(pwd = getpwuid(getuid()))) 88 errx(1, "no password file entry for you"); 89 file = pwd->pw_name; 90 (void)snprintf(buf, sizeof(buf), 91 "%s/%s", _PATH_MAILDIR, file); 92 file = buf; 93 } 94 } 95 } 96 97 /* read from stdin */ 98 if (strcmp(file, "-") == 0) { 99 mbox = stdin; 100 } 101 else if ((mbox = fopen(file, "r")) == NULL) { 102 errx(1, "can't read %s", file); 103 } 104 for (newline = 1; fgets(buf, sizeof(buf), mbox);) { 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 fclose(mbox); 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(const char *line, const char *sender) 134 { 135 char ch, pch, first; 136 const char *p, *t; 137 138 for (first = *sender++;;) { 139 if (isspace(ch = *line)) 140 return(0); 141 ++line; 142 ch = tolower(ch); 143 if (ch != first) 144 continue; 145 for (p = sender, t = line;;) { 146 if (!(pch = *p++)) 147 return(1); 148 ch = tolower(*t); 149 t++; 150 if (ch != pch) 151 break; 152 } 153 } 154 /* NOTREACHED */ 155 } 156