from.c revision 1590
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1980, 1988, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 351590Srgrimesstatic char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1980, 1988, 1993\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 411590Srgrimesstatic char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 421590Srgrimes#endif /* not lint */ 431590Srgrimes 441590Srgrimes#include <sys/types.h> 451590Srgrimes#include <ctype.h> 461590Srgrimes#include <pwd.h> 471590Srgrimes#include <stdio.h> 481590Srgrimes#include <paths.h> 491590Srgrimes 501590Srgrimesmain(argc, argv) 511590Srgrimes int argc; 521590Srgrimes char **argv; 531590Srgrimes{ 541590Srgrimes extern char *optarg; 551590Srgrimes extern int optind; 561590Srgrimes struct passwd *pwd; 571590Srgrimes int ch, newline; 581590Srgrimes char *file, *sender, *p; 591590Srgrimes#if MAXPATHLEN > BUFSIZ 601590Srgrimes char buf[MAXPATHLEN]; 611590Srgrimes#else 621590Srgrimes char buf[BUFSIZ]; 631590Srgrimes#endif 641590Srgrimes 651590Srgrimes file = sender = NULL; 661590Srgrimes while ((ch = getopt(argc, argv, "f:s:")) != EOF) 671590Srgrimes switch((char)ch) { 681590Srgrimes case 'f': 691590Srgrimes file = optarg; 701590Srgrimes break; 711590Srgrimes case 's': 721590Srgrimes sender = optarg; 731590Srgrimes for (p = sender; *p; ++p) 741590Srgrimes if (isupper(*p)) 751590Srgrimes *p = tolower(*p); 761590Srgrimes break; 771590Srgrimes case '?': 781590Srgrimes default: 791590Srgrimes fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 801590Srgrimes exit(1); 811590Srgrimes } 821590Srgrimes argv += optind; 831590Srgrimes 841590Srgrimes if (!file) { 851590Srgrimes if (!(file = *argv)) { 861590Srgrimes if (!(pwd = getpwuid(getuid()))) { 871590Srgrimes fprintf(stderr, 881590Srgrimes "from: no password file entry for you.\n"); 891590Srgrimes exit(1); 901590Srgrimes } 911590Srgrimes file = pwd->pw_name; 921590Srgrimes } 931590Srgrimes (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file); 941590Srgrimes file = buf; 951590Srgrimes } 961590Srgrimes if (!freopen(file, "r", stdin)) { 971590Srgrimes fprintf(stderr, "from: can't read %s.\n", file); 981590Srgrimes exit(1); 991590Srgrimes } 1001590Srgrimes for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 1011590Srgrimes if (*buf == '\n') { 1021590Srgrimes newline = 1; 1031590Srgrimes continue; 1041590Srgrimes } 1051590Srgrimes if (newline && !strncmp(buf, "From ", 5) && 1061590Srgrimes (!sender || match(buf + 5, sender))) 1071590Srgrimes printf("%s", buf); 1081590Srgrimes newline = 0; 1091590Srgrimes } 1101590Srgrimes exit(0); 1111590Srgrimes} 1121590Srgrimes 1131590Srgrimesmatch(line, sender) 1141590Srgrimes register char *line, *sender; 1151590Srgrimes{ 1161590Srgrimes register char ch, pch, first, *p, *t; 1171590Srgrimes 1181590Srgrimes for (first = *sender++;;) { 1191590Srgrimes if (isspace(ch = *line)) 1201590Srgrimes return(0); 1211590Srgrimes ++line; 1221590Srgrimes if (isupper(ch)) 1231590Srgrimes ch = tolower(ch); 1241590Srgrimes if (ch != first) 1251590Srgrimes continue; 1261590Srgrimes for (p = sender, t = line;;) { 1271590Srgrimes if (!(pch = *p++)) 1281590Srgrimes return(1); 1291590Srgrimes if (isupper(ch = *t++)) 1301590Srgrimes ch = tolower(ch); 1311590Srgrimes if (ch != pch) 1321590Srgrimes break; 1331590Srgrimes } 1341590Srgrimes } 1351590Srgrimes /* NOTREACHED */ 1361590Srgrimes} 137