339 lines
7.9 KiB
C
339 lines
7.9 KiB
C
/* Error handler for noninteractive utilities
|
||
Copyright (C) 1990-1998, 2000-2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
||
|
||
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
|
||
|
||
#if !_LIBC
|
||
# include <config.h>
|
||
#endif
|
||
|
||
#include "error.h"
|
||
|
||
#include <stdarg.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
|
||
#if !_LIBC && ENABLE_NLS
|
||
# include "gettext.h"
|
||
#endif
|
||
|
||
#ifdef _LIBC
|
||
# include <libintl.h>
|
||
# include <stdbool.h>
|
||
# include <stdint.h>
|
||
# include <wchar.h>
|
||
# define mbsrtowcs __mbsrtowcs
|
||
#endif
|
||
|
||
#if USE_UNLOCKED_IO
|
||
# 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 <limits.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
|
||
|
||
/* 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 /* HAVE_STRERROR_R || defined strerror_r */
|
||
#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
|
||
__fxprintf (NULL, ": %s", s);
|
||
#else
|
||
fprintf (stderr, ": %s", s);
|
||
#endif
|
||
}
|
||
|
||
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;
|
||
wchar_t *wmessage = NULL;
|
||
mbstate_t st;
|
||
size_t res;
|
||
const char *tmp;
|
||
bool use_malloc = false;
|
||
|
||
while (1)
|
||
{
|
||
if (__libc_use_alloca (len * sizeof (wchar_t)))
|
||
wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
|
||
else
|
||
{
|
||
if (!use_malloc)
|
||
wmessage = NULL;
|
||
|
||
wchar_t *p = (wchar_t *) realloc (wmessage,
|
||
len * sizeof (wchar_t));
|
||
if (p == NULL)
|
||
{
|
||
free (wmessage);
|
||
fputws_unlocked (L"out of memory\n", stderr);
|
||
return;
|
||
}
|
||
wmessage = p;
|
||
use_malloc = true;
|
||
}
|
||
|
||
memset (&st, '\0', sizeof (st));
|
||
tmp = message;
|
||
|
||
res = mbsrtowcs (wmessage, &tmp, len, &st);
|
||
if (res != len)
|
||
break;
|
||
|
||
if (__builtin_expect (len >= SIZE_MAX / 2, 0))
|
||
{
|
||
/* This really should not happen if everything is fine. */
|
||
res = (size_t) -1;
|
||
break;
|
||
}
|
||
|
||
len *= 2;
|
||
}
|
||
|
||
if (res == (size_t) -1)
|
||
{
|
||
/* The string cannot be converted. */
|
||
if (use_malloc)
|
||
{
|
||
free (wmessage);
|
||
use_malloc = false;
|
||
}
|
||
wmessage = (wchar_t *) L"???";
|
||
}
|
||
|
||
__vfwprintf (stderr, wmessage, args);
|
||
|
||
if (use_malloc)
|
||
free (wmessage);
|
||
}
|
||
else
|
||
#endif
|
||
vfprintf (stderr, message, args);
|
||
va_end (args);
|
||
|
||
++error_message_count;
|
||
if (errnum)
|
||
print_errno_message (errnum);
|
||
#if _LIBC
|
||
__fxprintf (NULL, "\n");
|
||
#else
|
||
putc ('\n', stderr);
|
||
#endif
|
||
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
|
||
__fxprintf (NULL, "%s: ", program_name);
|
||
#else
|
||
fprintf (stderr, "%s: ", program_name);
|
||
#endif
|
||
}
|
||
|
||
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
|
||
__fxprintf (NULL, "%s:", program_name);
|
||
#else
|
||
fprintf (stderr, "%s:", program_name);
|
||
#endif
|
||
}
|
||
|
||
#if _LIBC
|
||
__fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
|
||
file_name, line_number);
|
||
#else
|
||
fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
|
||
file_name, line_number);
|
||
#endif
|
||
|
||
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
|