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-rw-r--r--gl/error.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/gl/error.c b/gl/error.c
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+++ b/gl/error.c
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+/* 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
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