154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/* $NetBSD: from.c,v 1.17 2008/07/21 14:19:22 lukem Exp $ */
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/*
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* Copyright (c) 1980, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: from.c,v 1.17 2008/07/21 14:19:22 lukem Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int main (int, char **);
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int match (const char *, const char *);
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int
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main(int argc, char **argv)
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{
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struct passwd *pwd;
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int ch, newline;
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char *file, *sender, *p;
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#if MAXPATHLEN > BUFSIZ
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char buf[MAXPATHLEN];
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#else
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char buf[BUFSIZ];
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#endif
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file = sender = NULL;
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while ((ch = getopt(argc, argv, "f:s:")) != -1)
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switch((char)ch) {
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case 'f':
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file = optarg;
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break;
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case 's':
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sender = optarg;
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for (p = sender; *p; ++p)
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*p = tolower((unsigned char)*p);
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break;
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default:
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fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
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exit(1);
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}
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argv += optind;
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/*
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* We find the mailbox by:
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* 1 -f flag
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* 2 user
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* 2 MAIL environment variable
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* 3 _PATH_MAILDIR/file
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*/
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if (!file) {
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if (!(file = *argv)) {
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if (!(file = getenv("MAIL"))) {
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if (!(pwd = getpwuid(getuid())))
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errx(1, "no password file entry for you");
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if ((file = getenv("LOGNAME")) != NULL ||
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(file = getenv("USER")) != NULL) {
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(void)snprintf(buf, sizeof(buf),
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"%s/%s", _PATH_MAILDIR, file);
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file = buf;
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} else
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(void)snprintf(file = buf, sizeof(buf),
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"%s/%s",
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_PATH_MAILDIR, pwd->pw_name);
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}
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} else {
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(void)snprintf(buf, sizeof(buf), "%s/%s",
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_PATH_MAILDIR, file);
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file = buf;
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}
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}
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if (!freopen(file, "r", stdin))
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err(1, "can't read %s", file);
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for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
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if (*buf == '\n') {
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newline = 1;
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continue;
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}
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if (newline && !strncmp(buf, "From ", 5) &&
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(!sender || match(buf + 5, sender)))
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printf("%s", buf);
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newline = 0;
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}
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exit(0);
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}
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int
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match(const char *line, const char *sender)
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{
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char ch, pch, first;
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const char *p, *t;
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for (first = *sender++;;) {
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if (isspace((unsigned char)(ch = *line)))
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return(0);
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++line;
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ch = tolower((unsigned char)ch);
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if (ch != first)
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continue;
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for (p = sender, t = line;;) {
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if (!(pch = *p++))
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return(1);
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ch = tolower((unsigned char)*t++);
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if (ch != pch)
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break;
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}
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}
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/* NOTREACHED */
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}
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