summaryrefslogtreecommitdiffstats
path: root/lib/error.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/error.c')
-rw-r--r--lib/error.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/lib/error.c b/lib/error.c
new file mode 100644
index 0000000..2fc7901
--- /dev/null
+++ b/lib/error.c
@@ -0,0 +1,411 @@
+/* Error handler for noninteractive utilities
+ Copyright (C) 1990-1998, 2000-2007, 2009-2020 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
+
+/* 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"
+# define _(msgid) gettext (msgid)
+#endif
+
+#ifdef _LIBC
+# include <libintl.h>
+# include <stdbool.h>
+# include <stdint.h>
+# include <wchar.h>
+# define mbsrtowcs __mbsrtowcs
+# define USE_UNLOCKED_IO 0
+# define _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD(a, b)
+# define _GL_ARG_NONNULL(a)
+#else
+# include "getprogname.h"
+#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) _IO_fflush (s)
+# undef putc
+# define putc(c, fp) _IO_putc (c, fp)
+
+# include <bits/libc-lock.h>
+
+#else /* not _LIBC */
+
+# include <fcntl.h>
+# include <unistd.h>
+
+# if defined _WIN32 && ! defined __CYGWIN__
+/* Get declarations of the native Windows API functions. */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+/* Get _get_osfhandle. */
+# if GNULIB_MSVC_NOTHROW
+# include "msvc-nothrow.h"
+# else
+# include <io.h>
+# endif
+# endif
+
+/* The gnulib override of fcntl is not needed in this file. */
+# undef fcntl
+
+# if !(GNULIB_STRERROR_R_POSIX || HAVE_DECL_STRERROR_R)
+# ifndef HAVE_DECL_STRERROR_R
+"this configure-time declaration test was not run"
+# endif
+# if STRERROR_R_CHAR_P
+char *strerror_r (int errnum, char *buf, size_t buflen);
+# else
+int strerror_r (int errnum, char *buf, size_t buflen);
+# endif
+# endif
+
+# define program_name getprogname ()
+
+# if GNULIB_STRERROR_R_POSIX || HAVE_STRERROR_R || defined strerror_r
+# define __strerror_r strerror_r
+# endif /* GNULIB_STRERROR_R_POSIX || HAVE_STRERROR_R || defined strerror_r */
+#endif /* not _LIBC */
+
+#if !_LIBC
+/* Return non-zero if FD is open. */
+static int
+is_open (int fd)
+{
+# if defined _WIN32 && ! defined __CYGWIN__
+ /* On native Windows: The initial state of unassigned standard file
+ descriptors is that they are open but point to an INVALID_HANDLE_VALUE.
+ There is no fcntl, and the gnulib replacement fcntl does not support
+ F_GETFL. */
+ return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
+# else
+# ifndef F_GETFL
+# error Please port fcntl to your platform
+# endif
+ return 0 <= fcntl (fd, F_GETFL);
+# endif
+}
+#endif
+
+static void
+flush_stdout (void)
+{
+#if !_LIBC
+ int stdout_fd;
+
+# if GNULIB_FREOPEN_SAFER
+ /* Use of gnulib's freopen-safer module normally ensures that
+ fileno (stdout) == 1
+ whenever stdout is open. */
+ stdout_fd = STDOUT_FILENO;
+# else
+ /* POSIX states that fileno (stdout) after fclose is unspecified. But in
+ practice it is not a problem, because stdout is statically allocated and
+ the fd of a FILE stream is stored as a field in its allocated memory. */
+ stdout_fd = fileno (stdout);
+# endif
+ /* POSIX states that fflush (stdout) after fclose is unspecified; it
+ is safe in glibc, but not on all other platforms. fflush (NULL)
+ is always defined, but too draconian. */
+ if (0 <= stdout_fd && is_open (stdout_fd))
+#endif
+ fflush (stdout);
+}
+
+static void
+print_errno_message (int errnum)
+{
+ char const *s;
+
+#if _LIBC || GNULIB_STRERROR_R_POSIX || defined HAVE_STRERROR_R
+ char errbuf[1024];
+# if _LIBC || (!GNULIB_STRERROR_R_POSIX && STRERROR_R_CHAR_P)
+ 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 _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD (3, 0) _GL_ARG_NONNULL ((3))
+error_tail (int status, int errnum, const char *message, va_list args)
+{
+#if _LIBC
+ if (_IO_fwide (stderr, 0) > 0)
+ {
+ 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 / sizeof (wchar_t) / 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);
+
+ ++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
+
+ flush_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);
+ va_end (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
+ || (old_file_name != NULL
+ && file_name != NULL
+ && 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
+
+ flush_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:%u: " : " ",
+ file_name, line_number);
+#else
+ fprintf (stderr, file_name != NULL ? "%s:%u: " : " ",
+ file_name, line_number);
+#endif
+
+ va_start (args, message);
+ error_tail (status, errnum, message, args);
+ va_end (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