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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1988, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/types.h> 49 #include <ctype.h> 50 #include <err.h> 51 #include <pwd.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <paths.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 int match(char *, char *); 59 static void usage(void); 60 61 int 62 main(int argc, char **argv) 63 { 64 FILE *mbox; 65 struct passwd *pwd; 66 int ch, count, newline; 67 char *file, *sender, *p; 68 #if MAXPATHLEN > BUFSIZ 69 char buf[MAXPATHLEN]; 70 #else 71 char buf[BUFSIZ]; 72 #endif 73 74 file = sender = NULL; 75 count = -1; 76 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 77 switch (ch) { 78 case 'c': 79 count = 0; 80 break; 81 case 'f': 82 file = optarg; 83 break; 84 case 's': 85 sender = optarg; 86 for (p = sender; *p; ++p) 87 if (isupper(*p)) 88 *p = tolower(*p); 89 break; 90 case '?': 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (file == NULL) { 98 if (argc) { 99 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 100 file = buf; 101 } else { 102 if (!(file = getenv("MAIL"))) { 103 if (!(pwd = getpwuid(getuid()))) 104 errx(1, "no password file entry for you"); 105 file = pwd->pw_name; 106 (void)snprintf(buf, sizeof(buf), 107 "%s/%s", _PATH_MAILDIR, file); 108 file = buf; 109 } 110 } 111 } 112 113 /* read from stdin */ 114 if (strcmp(file, "-") == 0) { 115 mbox = stdin; 116 } 117 else if ((mbox = fopen(file, "r")) == NULL) { 118 errx(1, "can't read %s", file); 119 } 120 for (newline = 1; fgets(buf, sizeof(buf), mbox);) { 121 if (*buf == '\n') { 122 newline = 1; 123 continue; 124 } 125 if (newline && !strncmp(buf, "From ", 5) && 126 (!sender || match(buf + 5, sender))) { 127 if (count != -1) 128 count++; 129 else 130 printf("%s", buf); 131 } 132 newline = 0; 133 } 134 if (count != -1) 135 printf("There %s %d message%s in your incoming mailbox.\n", 136 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 137 fclose(mbox); 138 exit(0); 139 } 140 141 static void 142 usage(void) 143 { 144 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 145 exit(1); 146 } 147 148 int 149 match(char *line, char *sender) 150 { 151 char ch, pch, first, *p, *t; 152 153 for (first = *sender++;;) { 154 if (isspace(ch = *line)) 155 return(0); 156 ++line; 157 if (isupper(ch)) 158 ch = tolower(ch); 159 if (ch != first) 160 continue; 161 for (p = sender, t = line;;) { 162 if (!(pch = *p++)) 163 return(1); 164 if (isupper(ch = *t++)) 165 ch = tolower(ch); 166 if (ch != pch) 167 break; 168 } 169 } 170 /* NOTREACHED */ 171 } 172