/gnu/usr.bin/grep/error.c
C | 276 lines | 201 code | 32 blank | 43 comment | 32 complexity | 57f0239759427daf6c69912d5956fe38 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, BSD-3-Clause, LGPL-2.0, LGPL-2.1, BSD-2-Clause, 0BSD, JSON, AGPL-1.0, GPL-2.0
- /* Error handler for noninteractive utilities
- Copyright (C) 1990-1998, 2000 Free Software Foundation, Inc.
- This file is part of the GNU C Library. Its master source is NOT part of
- the C library, however. The master source lives in /gd/gnu/lib.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. 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 <stdio.h>
- #if HAVE_LIBINTL_H
- # include <libintl.h>
- #endif
- #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
- # if __STDC__
- # include <stdarg.h>
- # define VA_START(args, lastarg) va_start(args, lastarg)
- # else
- # include <varargs.h>
- # define VA_START(args, lastarg) va_start(args)
- # endif
- #else
- # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
- # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
- #endif
- #if STDC_HEADERS || _LIBC
- # include <stdlib.h>
- # include <string.h>
- #else
- void exit ();
- #endif
- #include "error.h"
- #ifndef HAVE_DECL_STRERROR_R
- "this configure-time declaration test was not run"
- #endif
- #if !HAVE_DECL_STRERROR_R
- char *strerror_r ();
- #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) (
- #if __STDC__ - 0
- void
- #endif
- );
- /* 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>
- /* In GNU libc we want do not want to use the common name `error' directly.
- Instead make it a weak alias. */
- # define error __error
- # define error_at_line __error_at_line
- # ifdef USE_IN_LIBIO
- # include <libio/iolibio.h>
- # define fflush(s) _IO_fflush (s)
- # endif
- #else /* not _LIBC */
- /* The calling program should define program_name and set it to the
- name of the executing program. */
- extern char *program_name;
- # ifdef HAVE_STRERROR_R
- # define __strerror_r strerror_r
- # else
- # if HAVE_STRERROR
- # ifndef strerror /* On some systems, strerror is a macro */
- char *strerror ();
- # endif
- # else
- static char *
- private_strerror (errnum)
- int errnum;
- {
- extern char *sys_errlist[];
- extern int sys_nerr;
- if (errnum > 0 && errnum <= sys_nerr)
- return _(sys_errlist[errnum]);
- return _("Unknown system error");
- }
- # define strerror private_strerror
- # endif /* HAVE_STRERROR */
- # endif /* HAVE_STRERROR_R */
- #endif /* not _LIBC */
- /* 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. */
- /* VARARGS */
- void
- #if defined VA_START && __STDC__
- error (int status, int errnum, const char *message, ...)
- #else
- error (status, errnum, message, va_alist)
- int status;
- int errnum;
- char *message;
- va_dcl
- #endif
- {
- #ifdef VA_START
- va_list args;
- #endif
- if (error_print_progname)
- (*error_print_progname) ();
- else
- {
- fflush (stdout);
- fprintf (stderr, "%s: ", program_name);
- }
- #ifdef VA_START
- VA_START (args, message);
- # if HAVE_VPRINTF || _LIBC
- vfprintf (stderr, message, args);
- # else
- _doprnt (message, args, stderr);
- # endif
- va_end (args);
- #else
- fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
- #endif
- ++error_message_count;
- if (errnum)
- {
- #if defined HAVE_STRERROR_R || _LIBC
- char errbuf[1024];
- # if HAVE_WORKING_STRERROR_R || _LIBC
- fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
- # else
- /* Don't use __strerror_r's return value because on some systems
- (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */
- __strerror_r (errnum, errbuf, sizeof errbuf);
- fprintf (stderr, ": %s", errbuf);
- # endif
- #else
- fprintf (stderr, ": %s", strerror (errnum));
- #endif
- }
- putc ('\n', stderr);
- fflush (stderr);
- if (status)
- exit (status);
- }
- /* 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
- #if defined VA_START && __STDC__
- error_at_line (int status, int errnum, const char *file_name,
- unsigned int line_number, const char *message, ...)
- #else
- error_at_line (status, errnum, file_name, line_number, message, va_alist)
- int status;
- int errnum;
- const char *file_name;
- unsigned int line_number;
- char *message;
- va_dcl
- #endif
- {
- #ifdef VA_START
- va_list args;
- #endif
- 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)))
- /* Simply return and print nothing. */
- return;
- old_file_name = file_name;
- old_line_number = line_number;
- }
- if (error_print_progname)
- (*error_print_progname) ();
- else
- {
- fflush (stdout);
- fprintf (stderr, "%s:", program_name);
- }
- if (file_name != NULL)
- fprintf (stderr, "%s:%d: ", file_name, line_number);
- #ifdef VA_START
- VA_START (args, message);
- # if HAVE_VPRINTF || _LIBC
- vfprintf (stderr, message, args);
- # else
- _doprnt (message, args, stderr);
- # endif
- va_end (args);
- #else
- fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
- #endif
- ++error_message_count;
- if (errnum)
- {
- #if defined HAVE_STRERROR_R || _LIBC
- char errbuf[1024];
- # if HAVE_WORKING_STRERROR_R || _LIBC
- fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
- # else
- /* Don't use __strerror_r's return value because on some systems
- (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */
- __strerror_r (errnum, errbuf, sizeof errbuf);
- fprintf (stderr, ": %s", errbuf);
- # endif
- #else
- fprintf (stderr, ": %s", strerror (errnum));
- #endif
- }
- putc ('\n', stderr);
- fflush (stderr);
- if (status)
- exit (status);
- }
- #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