File: [local] / src / usr.bin / tee / tee.c (download)
Revision 1.15, Sat Mar 4 00:00:25 2023 UTC (14 months, 2 weeks ago) by cheloha
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, HEAD Changes since 1.14: +2 -2 lines
tee(1): explicitly check read(2) return value for 0 and -1
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/* $OpenBSD: tee.c,v 1.15 2023/03/04 00:00:25 cheloha Exp $ */
/* $NetBSD: tee.c,v 1.5 1994/12/09 01:43:39 jtc Exp $ */
/*
* Copyright (c) 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. 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BSIZE (64 * 1024)
struct list {
SLIST_ENTRY(list) next;
int fd;
char *name;
};
SLIST_HEAD(, list) head;
static void
add(int fd, char *name)
{
struct list *p;
if ((p = malloc(sizeof(*p))) == NULL)
err(1, NULL);
p->fd = fd;
p->name = name;
SLIST_INSERT_HEAD(&head, p, next);
}
int
main(int argc, char *argv[])
{
struct list *p;
int fd;
ssize_t n, rval, wval;
int append, ch, exitval;
char *buf;
if (pledge("stdio wpath cpath", NULL) == -1)
err(1, "pledge");
SLIST_INIT(&head);
append = 0;
while ((ch = getopt(argc, argv, "ai")) != -1) {
switch(ch) {
case 'a':
append = 1;
break;
case 'i':
(void)signal(SIGINT, SIG_IGN);
break;
default:
(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
return 1;
}
}
argv += optind;
argc -= optind;
add(STDOUT_FILENO, "stdout");
exitval = 0;
while (*argv) {
if ((fd = open(*argv, O_WRONLY | O_CREAT |
(append ? O_APPEND : O_TRUNC), DEFFILEMODE)) == -1) {
warn("%s", *argv);
exitval = 1;
} else
add(fd, *argv);
argv++;
}
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
buf = malloc(BSIZE);
if (buf == NULL)
err(1, NULL);
while ((rval = read(STDIN_FILENO, buf, BSIZE)) != 0 && rval != -1) {
SLIST_FOREACH(p, &head, next) {
for (n = 0; n < rval; n += wval) {
wval = write(p->fd, buf + n, rval - n);
if (wval == -1) {
warn("%s", p->name);
exitval = 1;
break;
}
}
}
}
free(buf);
if (rval == -1) {
warn("read");
exitval = 1;
}
SLIST_FOREACH(p, &head, next) {
if (close(p->fd) == -1) {
warn("%s", p->name);
exitval = 1;
}
}
return exitval;
}