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(const char *, const 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 const char *file; 68 char *sender, *p; 69 #if MAXPATHLEN > BUFSIZ 70 char buf[MAXPATHLEN]; 71 #else 72 char buf[BUFSIZ]; 73 #endif 74 75 file = sender = NULL; 76 count = -1; 77 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 78 switch (ch) { 79 case 'c': 80 count = 0; 81 break; 82 case 'f': 83 file = optarg; 84 break; 85 case 's': 86 sender = optarg; 87 for (p = sender; *p; ++p) 88 if (isupper(*p)) 89 *p = tolower(*p); 90 break; 91 case '?': 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 if (file == NULL) { 99 if (argc) { 100 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 101 file = buf; 102 } else { 103 if (!(file = getenv("MAIL"))) { 104 if (!(pwd = getpwuid(getuid()))) 105 errx(1, "no password file entry for you"); 106 file = pwd->pw_name; 107 (void)snprintf(buf, sizeof(buf), 108 "%s/%s", _PATH_MAILDIR, file); 109 file = buf; 110 } 111 } 112 } 113 114 /* read from stdin */ 115 if (strcmp(file, "-") == 0) { 116 mbox = stdin; 117 } 118 else if ((mbox = fopen(file, "r")) == NULL) { 119 errx(1, "can't read %s", file); 120 } 121 for (newline = 1; fgets(buf, sizeof(buf), mbox);) { 122 if (*buf == '\n') { 123 newline = 1; 124 continue; 125 } 126 if (newline && !strncmp(buf, "From ", 5) && 127 (!sender || match(buf + 5, sender))) { 128 if (count != -1) 129 count++; 130 else 131 printf("%s", buf); 132 } 133 newline = 0; 134 } 135 if (count != -1) 136 printf("There %s %d message%s in your incoming mailbox.\n", 137 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 138 fclose(mbox); 139 exit(0); 140 } 141 142 static void 143 usage(void) 144 { 145 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 146 exit(1); 147 } 148 149 int 150 match(const char *line, const char *sender) 151 { 152 char ch, pch, first; 153 const char *p, *t; 154 155 for (first = *sender++;;) { 156 if (isspace(ch = *line)) 157 return(0); 158 ++line; 159 if (isupper(ch)) 160 ch = tolower(ch); 161 if (ch != first) 162 continue; 163 for (p = sender, t = line;;) { 164 if (!(pch = *p++)) 165 return(1); 166 if (isupper(ch = *t++)) 167 ch = tolower(ch); 168 if (ch != pch) 169 break; 170 } 171 } 172 /* NOTREACHED */ 173 } 174