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__attribute__((__used__)) 36static const char copyright[] = 37"@(#) Copyright (c) 1980, 1988, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 44#endif 45#endif /* not lint */ 46#include <sys/cdefs.h> 47__RCSID("$FreeBSD: src/usr.bin/from/from.c,v 1.14 2002/09/04 23:29:00 dwmalone Exp $"); 48 49#include <sys/types.h> 50#include <ctype.h> 51#include <err.h> 52#include <pwd.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <paths.h> 56#include <string.h> 57#include <unistd.h> 58 59int match(const char *, const char *); 60static void usage(void); 61 62int 63main(int argc, char **argv) 64{ 65 FILE *mbox; 66 struct passwd *pwd; 67 int ch, count, newline; 68 const char *file; 69 char *sender, *p; 70#if MAXPATHLEN > BUFSIZ 71 char buf[MAXPATHLEN]; 72#else 73 char buf[BUFSIZ]; 74#endif 75 76 file = sender = NULL; 77 count = -1; 78 while ((ch = getopt(argc, argv, "cf:s:")) != -1) 79 switch (ch) { 80 case 'c': 81 count = 0; 82 break; 83 case 'f': 84 file = optarg; 85 break; 86 case 's': 87 sender = optarg; 88 for (p = sender; *p; ++p) 89 if (isupper(*p)) 90 *p = tolower(*p); 91 break; 92 case '?': 93 default: 94 usage(); 95 } 96 argc -= optind; 97 argv += optind; 98 99 if (file == NULL) { 100 if (argc) { 101 (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv); 102 file = buf; 103 } else { 104 if (!(file = getenv("MAIL"))) { 105 if (!(pwd = getpwuid(getuid()))) 106 errx(1, "no password file entry for you"); 107 file = pwd->pw_name; 108 (void)snprintf(buf, sizeof(buf), 109 "%s/%s", _PATH_MAILDIR, file); 110 file = buf; 111 } 112 } 113 } 114 115 /* read from stdin */ 116 if (strcmp(file, "-") == 0) { 117 mbox = stdin; 118 } 119 else if ((mbox = fopen(file, "r")) == NULL) { 120 errx(1, "can't read %s", file); 121 } 122 for (newline = 1; fgets(buf, sizeof(buf), mbox);) { 123 if (*buf == '\n') { 124 newline = 1; 125 continue; 126 } 127 if (newline && !strncmp(buf, "From ", 5) && 128 (!sender || match(buf + 5, sender))) { 129 if (count != -1) 130 count++; 131 else 132 printf("%s", buf); 133 } 134 newline = 0; 135 } 136 if (count != -1) 137 printf("There %s %d message%s in your incoming mailbox.\n", 138 count == 1 ? "is" : "are", count, count == 1 ? "" : "s"); 139 fclose(mbox); 140 exit(0); 141} 142 143static void 144usage(void) 145{ 146 fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n"); 147 exit(1); 148} 149 150int 151match(const char *line, const char *sender) 152{ 153 char ch, pch, first; 154 const char *p, *t; 155 156 for (first = *sender++;;) { 157 if (isspace(ch = *line)) 158 return(0); 159 ++line; 160 if (isupper(ch)) 161 ch = tolower(ch); 162 if (ch != first) 163 continue; 164 for (p = sender, t = line;;) { 165 if (!(pch = *p++)) 166 return(1); 167 if (isupper(ch = *t++)) 168 ch = tolower(ch); 169 if (ch != pch) 170 break; 171 } 172 } 173 /* NOTREACHED */ 174} 175