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/* error.c -- error handler for noninteractive utilities
Copyright (C) 1990, 91, 92, 93, 94, 95 Free Software Foundation, Inc.
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, 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
# if __STDC__
# include <stdarg.h>
# define VA_START(args, lastarg) va_start(args, lastarg)
# else
# include <varargs.h>
# define VA_START(args, lastarg) va_start(args)
# endif
#else
# define va_alist a1, a2, a3, a4, a5, a6, a7, a8
# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
#endif
#if STDC_HEADERS || _LIBC
# include <stdlib.h>
# include <string.h>
#else
void exit ();
#endif
/* This variable is incremented each time `error' is called. */
unsigned int error_message_count;
/* If NULL, error will flush stdout, then print on stderr the program
name, a colon and a space. Otherwise, error will call this
function without parameters instead. */
void (*error_print_progname) () = NULL;
#ifdef _LIBC
#define program_name program_invocation_name
#endif
/* The calling program should define program_name and set it to the
name of the executing program. */
extern char *program_name;
#if HAVE_STRERROR || _LIBC
# ifndef strerror /* On some systems, strerror is a macro */
char *strerror ();
# endif
#else
static char *
private_strerror (errnum)
int errnum;
{
extern char *sys_errlist[];
extern int sys_nerr;
if (errnum > 0 && errnum <= sys_nerr)
return sys_errlist[errnum];
return "Unknown system error";
}
#define strerror private_strerror
#endif
/* Print the program name and error message MESSAGE, which is a printf-style
format string with optional args.
If ERRNUM is nonzero, print its corresponding system error message.
Exit with status STATUS if it is nonzero. */
/* VARARGS */
void
#if defined(VA_START) && __STDC__
error (int status, int errnum, const char *message, ...)
#else
error (status, errnum, message, va_alist)
int status;
int errnum;
char *message;
va_dcl
#endif
{
#ifdef VA_START
va_list args;
#endif
if (error_print_progname)
(*error_print_progname) ();
else
{
fflush (stdout);
fprintf (stderr, "%s: ", program_name);
}
#ifdef VA_START
VA_START (args, message);
# if HAVE_VPRINTF || _LIBC
vfprintf (stderr, message, args);
# else
_doprnt (message, args, stderr);
# endif
va_end (args);
#else
fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
#endif
++error_message_count;
if (errnum)
fprintf (stderr, ": %s", strerror (errnum));
putc ('\n', stderr);
fflush (stderr);
if (status)
exit (status);
}
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