305 lines
7.4 KiB
C
305 lines
7.4 KiB
C
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/* Error handler for noninteractive utilities
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Copyright (C) 1990-1998, 2000-2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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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 "error.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !_LIBC && ENABLE_NLS
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# include "gettext.h"
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#endif
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#ifdef _LIBC
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# include <wchar.h>
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# define mbsrtowcs __mbsrtowcs
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#endif
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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#endif
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#ifndef _
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# define _(String) String
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#endif
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/* If NULL, error will flush stdout, then print on stderr the program
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name, a colon and a space. Otherwise, error will call this
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function without parameters instead. */
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void (*error_print_progname) (void);
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/* This variable is incremented each time `error' is called. */
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unsigned int error_message_count;
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#ifdef _LIBC
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/* In the GNU C library, there is a predefined variable for this. */
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# define program_name program_invocation_name
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# include <errno.h>
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# include <libio/libioP.h>
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/* In GNU libc we want do not want to use the common name `error' directly.
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Instead make it a weak alias. */
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extern void __error (int status, int errnum, const char *message, ...)
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__attribute__ ((__format__ (__printf__, 3, 4)));
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extern void __error_at_line (int status, int errnum, const char *file_name,
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unsigned int line_number, const char *message,
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...)
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__attribute__ ((__format__ (__printf__, 5, 6)));;
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# define error __error
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# define error_at_line __error_at_line
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# include <libio/iolibio.h>
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# define fflush(s) INTUSE(_IO_fflush) (s)
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# undef putc
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# define putc(c, fp) INTUSE(_IO_putc) (c, fp)
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# include <bits/libc-lock.h>
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#else /* not _LIBC */
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# if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
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# ifndef HAVE_DECL_STRERROR_R
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"this configure-time declaration test was not run"
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# endif
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char *strerror_r ();
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# endif
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# ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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# endif
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/* The calling program should define program_name and set it to the
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name of the executing program. */
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extern char *program_name;
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# if HAVE_STRERROR_R || defined strerror_r
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# define __strerror_r strerror_r
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# endif
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#endif /* not _LIBC */
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static void
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print_errno_message (int errnum)
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{
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char const *s = NULL;
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#if defined HAVE_STRERROR_R || _LIBC
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char errbuf[1024];
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# if STRERROR_R_CHAR_P || _LIBC
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s = __strerror_r (errnum, errbuf, sizeof errbuf);
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# else
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if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
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s = errbuf;
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# endif
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#endif
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#if !_LIBC
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if (! s && ! (s = strerror (errnum)))
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s = _("Unknown system error");
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#endif
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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{
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__fwprintf (stderr, L": %s", s);
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return;
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}
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#endif
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fprintf (stderr, ": %s", s);
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}
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static void
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error_tail (int status, int errnum, const char *message, va_list args)
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{
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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{
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# define ALLOCA_LIMIT 2000
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size_t len = strlen (message) + 1;
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const wchar_t *wmessage = L"out of memory";
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wchar_t *wbuf = (len < ALLOCA_LIMIT
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? alloca (len * sizeof *wbuf)
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: len <= SIZE_MAX / sizeof *wbuf
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? malloc (len * sizeof *wbuf)
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: NULL);
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if (wbuf)
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{
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size_t res;
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mbstate_t st;
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const char *tmp = message;
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memset (&st, '\0', sizeof (st));
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res = mbsrtowcs (wbuf, &tmp, len, &st);
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wmessage = res == (size_t) -1 ? L"???" : wbuf;
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}
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__vfwprintf (stderr, wmessage, args);
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if (! (len < ALLOCA_LIMIT))
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free (wbuf);
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}
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else
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#endif
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vfprintf (stderr, message, args);
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va_end (args);
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++error_message_count;
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if (errnum)
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print_errno_message (errnum);
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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putwc (L'\n', stderr);
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else
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#endif
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putc ('\n', stderr);
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fflush (stderr);
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if (status)
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exit (status);
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}
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/* Print the program name and error message MESSAGE, which is a printf-style
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format string with optional args.
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If ERRNUM is nonzero, print its corresponding system error message.
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Exit with status STATUS if it is nonzero. */
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void
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error (int status, int errnum, const char *message, ...)
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{
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va_list args;
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#if defined _LIBC && defined __libc_ptf_call
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/* We do not want this call to be cut short by a thread
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cancellation. Therefore disable cancellation for now. */
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int state = PTHREAD_CANCEL_ENABLE;
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__libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
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0);
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#endif
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fflush (stdout);
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#ifdef _LIBC
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_IO_flockfile (stderr);
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#endif
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if (error_print_progname)
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(*error_print_progname) ();
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else
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{
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s: ", program_name);
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else
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#endif
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fprintf (stderr, "%s: ", program_name);
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}
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va_start (args, message);
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error_tail (status, errnum, message, args);
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#ifdef _LIBC
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_IO_funlockfile (stderr);
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# ifdef __libc_ptf_call
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__libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
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# endif
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#endif
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}
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/* Sometimes we want to have at most one error per line. This
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variable controls whether this mode is selected or not. */
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int error_one_per_line;
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void
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error_at_line (int status, int errnum, const char *file_name,
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unsigned int line_number, const char *message, ...)
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{
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va_list args;
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if (error_one_per_line)
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{
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static const char *old_file_name;
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static unsigned int old_line_number;
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if (old_line_number == line_number
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&& (file_name == old_file_name
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|| strcmp (old_file_name, file_name) == 0))
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/* Simply return and print nothing. */
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return;
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old_file_name = file_name;
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old_line_number = line_number;
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}
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#if defined _LIBC && defined __libc_ptf_call
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/* We do not want this call to be cut short by a thread
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cancellation. Therefore disable cancellation for now. */
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int state = PTHREAD_CANCEL_ENABLE;
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__libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
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0);
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#endif
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fflush (stdout);
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#ifdef _LIBC
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_IO_flockfile (stderr);
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#endif
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if (error_print_progname)
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(*error_print_progname) ();
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else
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{
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s: ", program_name);
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else
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#endif
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fprintf (stderr, "%s:", program_name);
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}
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if (file_name != NULL)
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{
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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__fwprintf (stderr, L"%s:%d: ", file_name, line_number);
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else
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#endif
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fprintf (stderr, "%s:%d: ", file_name, line_number);
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}
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va_start (args, message);
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error_tail (status, errnum, message, args);
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#ifdef _LIBC
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_IO_funlockfile (stderr);
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# ifdef __libc_ptf_call
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__libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
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# endif
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#endif
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}
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#ifdef _LIBC
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/* Make the weak alias. */
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# undef error
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# undef error_at_line
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weak_alias (__error, error)
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weak_alias (__error_at_line, error_at_line)
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#endif
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