/usr.bin/from/from.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 169 lines · 128 code · 11 blank · 30 comment · 38 complexity · a36ee106175ddc4c38854852371f515d MD5 · raw file
- /*
- * Copyright (c) 1980, 1988, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1980, 1988, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
- #endif
- #endif /* not lint */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/types.h>
- #include <ctype.h>
- #include <err.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <paths.h>
- #include <string.h>
- #include <unistd.h>
- int match(const char *, const char *);
- static void usage(void);
- int
- main(int argc, char **argv)
- {
- FILE *mbox;
- struct passwd *pwd;
- int ch, count, newline;
- const char *file;
- char *sender, *p;
- #if MAXPATHLEN > BUFSIZ
- char buf[MAXPATHLEN];
- #else
- char buf[BUFSIZ];
- #endif
- file = sender = NULL;
- count = -1;
- while ((ch = getopt(argc, argv, "cf:s:")) != -1)
- switch (ch) {
- case 'c':
- count = 0;
- break;
- case 'f':
- file = optarg;
- break;
- case 's':
- sender = optarg;
- for (p = sender; *p; ++p)
- if (isupper(*p))
- *p = tolower(*p);
- break;
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
- if (file == NULL) {
- if (argc) {
- (void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv);
- file = buf;
- } else {
- if (!(file = getenv("MAIL"))) {
- if (!(pwd = getpwuid(getuid())))
- errx(1, "no password file entry for you");
- file = pwd->pw_name;
- (void)snprintf(buf, sizeof(buf),
- "%s/%s", _PATH_MAILDIR, file);
- file = buf;
- }
- }
- }
- /* read from stdin */
- if (strcmp(file, "-") == 0) {
- mbox = stdin;
- }
- else if ((mbox = fopen(file, "r")) == NULL) {
- errx(1, "can't read %s", file);
- }
- for (newline = 1; fgets(buf, sizeof(buf), mbox);) {
- if (*buf == '\n') {
- newline = 1;
- continue;
- }
- if (newline && !strncmp(buf, "From ", 5) &&
- (!sender || match(buf + 5, sender))) {
- if (count != -1)
- count++;
- else
- printf("%s", buf);
- }
- newline = 0;
- }
- if (count != -1)
- printf("There %s %d message%s in your incoming mailbox.\n",
- count == 1 ? "is" : "are", count, count == 1 ? "" : "s");
- fclose(mbox);
- exit(0);
- }
- static void
- usage(void)
- {
- fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n");
- exit(1);
- }
- int
- match(const char *line, const char *sender)
- {
- char ch, pch, first;
- const char *p, *t;
- for (first = *sender++;;) {
- if (isspace(ch = *line))
- return(0);
- ++line;
- if (isupper(ch))
- ch = tolower(ch);
- if (ch != first)
- continue;
- for (p = sender, t = line;;) {
- if (!(pch = *p++))
- return(1);
- if (isupper(ch = *t++))
- ch = tolower(ch);
- if (ch != pch)
- break;
- }
- }
- /* NOTREACHED */
- }