150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
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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 <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 <paths.h>
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern char *optarg;
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extern int optind;
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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:?")) != EOF)
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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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if (isupper(*p))
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*p = tolower(*p);
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break;
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case '?':
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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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if (!file) {
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if (*argv) {
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(void)sprintf(buf, "%s/%s", _PATH_MAILDIR, *argv);
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file = buf;
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} else {
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if (!(file = getenv("MAIL"))) {
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if (!(pwd = getpwuid(getuid()))) {
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(void)fprintf(stderr,
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"from: no password file entry for you.\n");
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exit(1);
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}
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file = pwd->pw_name;
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(void)sprintf(buf,
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"%s/%s", _PATH_MAILDIR, file);
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file = buf;
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}
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}
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}
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/* read from stdin */
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if (strcmp(file, "-") == 0) {
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}
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else if (!freopen(file, "r", stdin)) {
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fprintf(stderr, "from: can't read %s.\n", file);
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exit(1);
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}
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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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match(line, sender)
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register char *line, *sender;
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{
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register char ch, pch, first, *p, *t;
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for (first = *sender++;;) {
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if (isspace(ch = *line))
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return(0);
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++line;
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if (isupper(ch))
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ch = tolower(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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if (isupper(ch = *t++))
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ch = tolower(ch);
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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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