freebsd-dev/usr.bin/from/from.c

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/*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#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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#endif /* not lint */
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/types.h>
#include <ctype.h>
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#include <err.h>
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#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
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#include <paths.h>
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#include <string.h>
#include <unistd.h>
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int match(const char *, const char *);
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static void usage(void);
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int
main(int argc, char **argv)
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{
FILE *mbox;
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struct passwd *pwd;
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int ch, count, newline;
const char *file;
char *sender, *p;
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#if MAXPATHLEN > BUFSIZ
char buf[MAXPATHLEN];
#else
char buf[BUFSIZ];
#endif
file = sender = NULL;
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count = -1;
while ((ch = getopt(argc, argv, "cf:s:")) != -1)
switch (ch) {
case 'c':
count = 0;
break;
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case 'f':
file = optarg;
break;
case 's':
sender = optarg;
for (p = sender; *p; ++p)
if (isupper(*p))
*p = tolower(*p);
break;
case '?':
default:
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usage();
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}
argc -= optind;
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argv += optind;
if (file == NULL) {
if (argc) {
(void)snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, *argv);
file = buf;
} else {
if (!(file = getenv("MAIL"))) {
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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;
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}
}
}
/* read from stdin */
if (strcmp(file, "-") == 0) {
mbox = stdin;
}
else if ((mbox = fopen(file, "r")) == NULL) {
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errx(1, "can't read %s", file);
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}
for (newline = 1; fgets(buf, sizeof(buf), mbox);) {
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if (*buf == '\n') {
newline = 1;
continue;
}
if (newline && !strncmp(buf, "From ", 5) &&
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(!sender || match(buf + 5, sender))) {
if (count != -1)
count++;
else
printf("%s", buf);
}
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newline = 0;
}
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if (count != -1)
printf("There %s %d message%s in your incoming mailbox.\n",
count == 1 ? "is" : "are", count, count == 1 ? "" : "s");
fclose(mbox);
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exit(0);
}
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static void
usage(void)
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{
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fprintf(stderr, "usage: from [-c] [-f file] [-s sender] [user]\n");
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exit(1);
}
int
match(const char *line, const char *sender)
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{
char ch, pch, first;
const char *p, *t;
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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 */
}