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/****************************************************************************
**
** File: error.c
**
** Author: Mike Borella
**
** Try to gracefully handle errors.
**
** $Id: error.c,v 1.3 2002/01/03 00:04:01 mborella Exp $
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Library General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
*****************************************************************************/
#include <errno.h>
#include "error.h"
#define ERROR_BUF_SIZE 32
int error_flag = 0;
/*
* This avoids a warning with glibc compilation
*/
#ifndef errno
extern int errno;
#endif
/*
* If we have strerror() we won't use sys_errlist, so don't bother defining
* it.
*/
#ifndef HAVE_STRERROR
extern char * sys_errlist[];
#endif
/*----------------------------------------------------------------------------
**
** Function: my_strerror()
**
** Comments: Use strerror() if this system supports it. Roll our own otherwise.
**
**----------------------------------------------------------------------------
*/
char *my_strerror(int errnum)
{
#ifdef HAVE_STRERROR
return (strerror(errnum));
#else
extern int sys_nerr;
static char ebuf[ERROR_BUF_SIZE];
if (errnum < sys_nerr)
return ((char *) sys_errlist[errnum]);
snprintf(ebuf, ERROR_BUF_SIZE, "Unknown error: %d", errnum);
return(ebuf);
#endif
}
/*----------------------------------------------------------------------------
**
** error()
**
** Generic error dumping. Here's how the arguments are used
**
** syserr: 0 is not an error from a system call, non-zero otherwise
** filename: filename of the caller. Optional.
** line: line number of the caller. Optional, set to 0 is filename and
** line number info is not to be printed
**
**----------------------------------------------------------------------------
*/
void error(int syserr, char *filename, int line, const char *fmt, va_list args)
{
/*
* Dump the error message
*/
fprintf(stderr,"ERROR: ");
if (line)
fprintf(stderr, "%s line %d: ", filename, line);
vfprintf(stderr, fmt, args);
/*
* If this is a system error, print the errno info. Otherwise, don't
*/
if (syserr)
{
fprintf(stderr," (%d ", errno);
fprintf(stderr, "%s)\n", my_strerror(errno));
}
else
fprintf(stderr, "\n");
}
/*****************************************************************************
* Externally-visible functions are below here
****************************************************************************/
/*----------------------------------------------------------------------------
**
** error_fatal()
**
** General fatal error.
**
**----------------------------------------------------------------------------
*/
void error_fatal(char *fmt, ...)
{
va_list args;
va_start(args,fmt);
error(0, "", 0, fmt, args);
va_end(args);
abort();
}
/*----------------------------------------------------------------------------
**
** error_system()
**
** General system error.
**
**----------------------------------------------------------------------------
*/
void error_system(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
error(1, "", 0, fmt, args);
va_end(args);
abort();
}
/*----------------------------------------------------------------------------
**
** error_message()
**
** General non-terminal error.
**
**----------------------------------------------------------------------------
*/
void error_message(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
error(1, "", 0, fmt, args);
va_end(args);
}
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