165 lines
4.0 KiB
C
165 lines
4.0 KiB
C
/* $NetBSD: utils.c,v 1.2 2014/01/22 06:15:04 riastradh Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2013 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Taylor R. Campbell.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
|
|
__RCSID("$NetBSD: utils.c,v 1.2 2014/01/22 06:15:04 riastradh Exp $");
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <limits.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
/* XXX Seems to be missing from <stdio.h>... */
|
|
int snprintf_ss(char *restrict, size_t, const char *restrict, ...)
|
|
__printflike(3, 4);
|
|
int vsnprintf_ss(char *restrict, size_t, const char *restrict, va_list)
|
|
__printflike(3, 0);
|
|
|
|
#include "utils.h"
|
|
|
|
/*
|
|
* Read, returning partial data only at end of file.
|
|
*/
|
|
ssize_t
|
|
read_block(int fd, void *buffer, size_t n)
|
|
{
|
|
char *p = buffer, *const end __unused = (p + n);
|
|
size_t total_read = 0;
|
|
|
|
while (n > 0) {
|
|
const ssize_t n_read = read(fd, p, n);
|
|
if (n_read == -1)
|
|
return -1;
|
|
assert(n_read >= 0);
|
|
if (n_read == 0)
|
|
break;
|
|
|
|
assert((size_t)n_read <= n);
|
|
n -= (size_t)n_read;
|
|
|
|
assert(p <= end);
|
|
assert(n_read <= (end - p));
|
|
p += (size_t)n_read;
|
|
|
|
assert((size_t)n_read <= (SIZE_MAX - total_read));
|
|
total_read += (size_t)n_read;
|
|
}
|
|
|
|
return total_read;
|
|
}
|
|
|
|
/*
|
|
* Signal-safe err/warn utilities. The errno varieties are limited to
|
|
* having no format arguments for reasons of laziness.
|
|
*/
|
|
|
|
void
|
|
err_ss(int exit_value, const char *msg)
|
|
{
|
|
warn_ss(msg);
|
|
_Exit(exit_value);
|
|
}
|
|
|
|
void
|
|
errx_ss(int exit_value, const char *format, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, format);
|
|
vwarnx_ss(format, va);
|
|
va_end(va);
|
|
_Exit(exit_value);
|
|
}
|
|
|
|
void
|
|
warn_ss(const char *msg)
|
|
{
|
|
int error = errno;
|
|
|
|
warnx_ss("%s: %s", msg, strerror(error));
|
|
|
|
errno = error;
|
|
}
|
|
|
|
void
|
|
warnx_ss(const char *format, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, format);
|
|
vwarnx_ss(format, va);
|
|
va_end(va);
|
|
}
|
|
|
|
void
|
|
vwarnx_ss(const char *format, va_list va)
|
|
{
|
|
char buf[128];
|
|
|
|
(void)strlcpy(buf, getprogname(), sizeof(buf));
|
|
(void)strlcat(buf, ": ", sizeof(buf));
|
|
|
|
const int n = vsnprintf_ss(&buf[strlen(buf)], (sizeof(buf) -
|
|
strlen(buf)), format, va);
|
|
if (n <= 0) {
|
|
const char fallback[] =
|
|
"vndcompress: Help! I'm trapped in a signal handler!\n";
|
|
(void)write(STDERR_FILENO, fallback, __arraycount(fallback));
|
|
} else {
|
|
(void)strlcat(buf, "\n", sizeof(buf));
|
|
(void)write(STDERR_FILENO, buf, strlen(buf));
|
|
}
|
|
}
|
|
|
|
void
|
|
block_signals(sigset_t *old_sigmask)
|
|
{
|
|
sigset_t block;
|
|
|
|
(void)sigfillset(&block);
|
|
(void)sigprocmask(SIG_BLOCK, &block, old_sigmask);
|
|
}
|
|
|
|
void
|
|
restore_sigmask(const sigset_t *sigmask)
|
|
{
|
|
|
|
(void)sigprocmask(SIG_SETMASK, sigmask, NULL);
|
|
}
|