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129 lines
3.3 KiB
129 lines
3.3 KiB
4 months ago
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/*
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* Copyright (c) 1999-2018 The strace developers.
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* 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <errno.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "error_prints.h"
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#ifndef HAVE_PROGRAM_INVOCATION_NAME
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extern char *program_invocation_name;
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#endif
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static void
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verror_msg(int err_no, const char *fmt, va_list p)
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{
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char *msg;
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fflush(NULL);
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/* We want to print entire message with single fprintf to ensure
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* message integrity if stderr is shared with other programs.
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* Thus we use vasprintf + single fprintf.
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*/
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msg = NULL;
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if (vasprintf(&msg, fmt, p) >= 0) {
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if (err_no)
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fprintf(stderr, "%s: %s: %s\n",
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program_invocation_name, msg, strerror(err_no));
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else
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fprintf(stderr, "%s: %s\n",
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program_invocation_name, msg);
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free(msg);
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} else {
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/* malloc in vasprintf failed, try it without malloc */
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fprintf(stderr, "%s: ", program_invocation_name);
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vfprintf(stderr, fmt, p);
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if (err_no)
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fprintf(stderr, ": %s\n", strerror(err_no));
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else
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putc('\n', stderr);
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}
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/* We don't switch stderr to buffered, thus fprintf(stderr)
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* always flushes its output and this is not necessary: */
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/* fflush(stderr); */
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}
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void
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error_msg(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(0, fmt, p);
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va_end(p);
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}
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void
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error_msg_and_die(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(0, fmt, p);
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va_end(p);
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die();
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}
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void
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error_msg_and_help(const char *fmt, ...)
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{
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if (fmt != NULL) {
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va_list p;
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va_start(p, fmt);
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verror_msg(0, fmt, p);
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va_end(p);
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}
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fprintf(stderr, "Try '%s -h' for more information.\n",
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program_invocation_name);
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die();
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}
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void
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perror_msg(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(errno, fmt, p);
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va_end(p);
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}
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void
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perror_msg_and_die(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(errno, fmt, p);
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va_end(p);
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die();
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}
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