freebsd-dev/contrib/diff/lib/error.c
2007-06-15 07:06:13 +00:00

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/* Error handler for noninteractive utilities
Copyright (C) 1990-1998, 2000-2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "error.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _LIBC
# include <libintl.h>
#else
# include "gettext.h"
#endif
#ifdef _LIBC
# include <wchar.h>
# define mbsrtowcs __mbsrtowcs
#endif
#if !_LIBC
# include "unlocked-io.h"
#endif
#ifndef _
# define _(String) String
#endif
/* 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) (void);
/* This variable is incremented each time `error' is called. */
unsigned int error_message_count;
#ifdef _LIBC
/* In the GNU C library, there is a predefined variable for this. */
# define program_name program_invocation_name
# include <errno.h>
# include <libio/libioP.h>
/* In GNU libc we want do not want to use the common name `error' directly.
Instead make it a weak alias. */
extern void __error (int status, int errnum, const char *message, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
extern void __error_at_line (int status, int errnum, const char *file_name,
unsigned int line_number, const char *message,
...)
__attribute__ ((__format__ (__printf__, 5, 6)));;
# define error __error
# define error_at_line __error_at_line
# include <libio/iolibio.h>
# define fflush(s) INTUSE(_IO_fflush) (s)
# undef putc
# define putc(c, fp) INTUSE(_IO_putc) (c, fp)
# include <bits/libc-lock.h>
#else /* not _LIBC */
# if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
# ifndef HAVE_DECL_STRERROR_R
"this configure-time declaration test was not run"
# endif
char *strerror_r ();
# endif
# ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
# 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_R || defined strerror_r
# define __strerror_r strerror_r
# endif
#endif /* not _LIBC */
static void
print_errno_message (int errnum)
{
char const *s;
#if defined HAVE_STRERROR_R || _LIBC
char errbuf[1024];
# if STRERROR_R_CHAR_P || _LIBC
s = __strerror_r (errnum, errbuf, sizeof errbuf);
# else
if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
s = errbuf;
else
s = 0;
# endif
#else
s = strerror (errnum);
#endif
#if !_LIBC
if (! s)
s = _("Unknown system error");
#endif
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
{
__fwprintf (stderr, L": %s", s);
return;
}
#endif
fprintf (stderr, ": %s", s);
}
static void
error_tail (int status, int errnum, const char *message, va_list args)
{
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
{
# define ALLOCA_LIMIT 2000
size_t len = strlen (message) + 1;
const wchar_t *wmessage = L"out of memory";
wchar_t *wbuf = (len < ALLOCA_LIMIT
? alloca (len * sizeof *wbuf)
: len <= SIZE_MAX / sizeof *wbuf
? malloc (len * sizeof *wbuf)
: NULL);
if (wbuf)
{
size_t res;
mbstate_t st;
const char *tmp = message;
memset (&st, '\0', sizeof (st));
res = mbsrtowcs (wbuf, &tmp, len, &st);
wmessage = res == (size_t) -1 ? L"???" : wbuf;
}
__vfwprintf (stderr, wmessage, args);
if (! (len < ALLOCA_LIMIT))
free (wbuf);
}
else
#endif
vfprintf (stderr, message, args);
va_end (args);
++error_message_count;
if (errnum)
print_errno_message (errnum);
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
putwc (L'\n', stderr);
else
#endif
putc ('\n', stderr);
fflush (stderr);
if (status)
exit (status);
}
/* 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. */
void
error (int status, int errnum, const char *message, ...)
{
va_list args;
#if defined _LIBC && defined __libc_ptf_call
/* We do not want this call to be cut short by a thread
cancellation. Therefore disable cancellation for now. */
int state = PTHREAD_CANCEL_ENABLE;
__libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
0);
#endif
fflush (stdout);
#ifdef _LIBC
_IO_flockfile (stderr);
#endif
if (error_print_progname)
(*error_print_progname) ();
else
{
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
__fwprintf (stderr, L"%s: ", program_name);
else
#endif
fprintf (stderr, "%s: ", program_name);
}
va_start (args, message);
error_tail (status, errnum, message, args);
#ifdef _LIBC
_IO_funlockfile (stderr);
# ifdef __libc_ptf_call
__libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
# endif
#endif
}
/* Sometimes we want to have at most one error per line. This
variable controls whether this mode is selected or not. */
int error_one_per_line;
void
error_at_line (int status, int errnum, const char *file_name,
unsigned int line_number, const char *message, ...)
{
va_list args;
if (error_one_per_line)
{
static const char *old_file_name;
static unsigned int old_line_number;
if (old_line_number == line_number
&& (file_name == old_file_name
|| strcmp (old_file_name, file_name) == 0))
/* Simply return and print nothing. */
return;
old_file_name = file_name;
old_line_number = line_number;
}
#if defined _LIBC && defined __libc_ptf_call
/* We do not want this call to be cut short by a thread
cancellation. Therefore disable cancellation for now. */
int state = PTHREAD_CANCEL_ENABLE;
__libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
0);
#endif
fflush (stdout);
#ifdef _LIBC
_IO_flockfile (stderr);
#endif
if (error_print_progname)
(*error_print_progname) ();
else
{
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
__fwprintf (stderr, L"%s: ", program_name);
else
#endif
fprintf (stderr, "%s:", program_name);
}
if (file_name != NULL)
{
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
__fwprintf (stderr, L"%s:%d: ", file_name, line_number);
else
#endif
fprintf (stderr, "%s:%d: ", file_name, line_number);
}
va_start (args, message);
error_tail (status, errnum, message, args);
#ifdef _LIBC
_IO_funlockfile (stderr);
# ifdef __libc_ptf_call
__libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
# endif
#endif
}
#ifdef _LIBC
/* Make the weak alias. */
# undef error
# undef error_at_line
weak_alias (__error, error)
weak_alias (__error_at_line, error_at_line)
#endif