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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1980, 1988, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 #endif /* not lint */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/types.h> 47 #include <ctype.h> 48 #include <err.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <paths.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 static int match(const char *, const char *); 57 static void usage(void); 58 59 int 60 main(int argc, char **argv) 61 { 62 FILE *mbox; 63 struct passwd *pwd; 64 int ch, count, newline; 65 const char *file; 66 char *sender, *p; 67 #if MAXPATHLEN > BUFSIZ 68 char buf[MAXPATHLEN]; 69 #else 70 char buf[BUFSIZ]; 71 #endif 72 73 file = sender = NULL; 74 count = -1; 75 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 76 switch (ch) { 77 case 'c': 78 count = 0; 79 break; 80 case 'f': 81 file = optarg; 82 break; 83 case 's': 84 sender = optarg; 85 for (p = sender; *p; ++p) 86 *p = tolower(*p); 87 break; 88 case '?': 89 default: 90 usage(); 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (file == NULL) { 96 if (argc) { 97 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 98 file = buf; 99 } else { 100 if (!(file = getenv("MAIL"))) { 101 if (!(pwd = getpwuid(getuid()))) 102 errx(1, "no password file entry for you"); 103 file = pwd->pw_name; 104 (void)snprintf(buf, sizeof(buf), 105 "%s/%s", _PATH_MAILDIR, file); 106 file = buf; 107 } 108 } 109 } 110 111 /* read from stdin */ 112 if (strcmp(file, "-") == 0) { 113 mbox = stdin; 114 } 115 else if ((mbox = fopen(file, "r")) == NULL) { 116 errx(1, "can't read %s", file); 117 } 118 for (newline = 1; fgets(buf, sizeof(buf), mbox);) { 119 if (*buf == '\n') { 120 newline = 1; 121 continue; 122 } 123 if (newline && !strncmp(buf, "From ", 5) && 124 (!sender || match(buf + 5, sender))) { 125 if (count != -1) 126 count++; 127 else 128 printf("%s", buf); 129 } 130 newline = 0; 131 } 132 if (count != -1) 133 printf("There %s %d message%s in your incoming mailbox.\n", 134 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 135 fclose(mbox); 136 exit(0); 137 } 138 139 static void 140 usage(void) 141 { 142 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 143 exit(1); 144 } 145 146 static int 147 match(const char *line, const char *sender) 148 { 149 char ch, pch, first; 150 const char *p, *t; 151 152 for (first = *sender++;;) { 153 if (isspace(ch = *line)) 154 return(0); 155 ++line; 156 ch = tolower(ch); 157 if (ch != first) 158 continue; 159 for (p = sender, t = line;;) { 160 if (!(pch = *p++)) 161 return(1); 162 ch = tolower(*t); 163 t++; 164 if (ch != pch) 165 break; 166 } 167 } 168 /* NOTREACHED */ 169 } 170