1/* Error handler for noninteractive utilities 2 Copyright (C) 1990,91,92,93,94,95,96,97,98 Free Software Foundation, Inc. 3 4 This file is part of the GNU C Library. Its master source is NOT part of 5 the C library, however. The master source lives in /gd/gnu/lib. 6 7 The GNU C Library is free software; you can redistribute it and/or 8 modify it under the terms of the GNU Library General Public License as 9 published by the Free Software Foundation; either version 2 of the 10 License, or (at your option) any later version. 11 12 The GNU C Library is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 Library General Public License for more details. 16 17 You should have received a copy of the GNU Library General Public 18 License along with the GNU C Library; see the file COPYING.LIB. If not, 19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ 23 24#ifdef HAVE_CONFIG_H 25# include <config.h> 26#endif 27 28#include <stdio.h> 29 30#if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC 31# if __STDC__ 32# include <stdarg.h> 33# define VA_START(args, lastarg) va_start(args, lastarg) 34# else 35# include <varargs.h> 36# define VA_START(args, lastarg) va_start(args) 37# endif 38#else 39# define va_alist a1, a2, a3, a4, a5, a6, a7, a8 40# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8; 41#endif 42 43#if STDC_HEADERS || _LIBC 44# include <stdlib.h> 45# include <string.h> 46#else 47void exit (); 48#endif 49 50#include "error.h" 51 52#ifndef _ 53# define _(String) String 54#endif 55 56/* If NULL, error will flush stdout, then print on stderr the program 57 name, a colon and a space. Otherwise, error will call this 58 function without parameters instead. */ 59void (*error_print_progname) ( 60#if __STDC__ - 0 61 void 62#endif 63 ); 64 65/* This variable is incremented each time `error' is called. */ 66unsigned int error_message_count; 67 68#ifdef _LIBC 69/* In the GNU C library, there is a predefined variable for this. */ 70 71# define program_name program_invocation_name 72# include <errno.h> 73 74/* In GNU libc we want do not want to use the common name `error' directly. 75 Instead make it a weak alias. */ 76# define error __error 77# define error_at_line __error_at_line 78 79#else /* not _LIBC */ 80 81/* The calling program should define program_name and set it to the 82 name of the executing program. */ 83extern char *program_name; 84 85# ifdef HAVE_STRERROR_R 86# define __strerror_r strerror_r 87# else 88# if HAVE_STRERROR 89# ifndef strerror /* On some systems, strerror is a macro */ 90char *strerror (); 91# endif 92# else 93static char * 94private_strerror (errnum) 95 int errnum; 96{ 97 extern char *sys_errlist[]; 98 extern int sys_nerr; 99 100 if (errnum > 0 && errnum <= sys_nerr) 101 return _(sys_errlist[errnum]); 102 return _("Unknown system error"); 103} 104# define strerror private_strerror 105# endif /* HAVE_STRERROR */ 106# endif /* HAVE_STRERROR_R */ 107#endif /* not _LIBC */ 108 109/* Print the program name and error message MESSAGE, which is a printf-style 110 format string with optional args. 111 If ERRNUM is nonzero, print its corresponding system error message. 112 Exit with status STATUS if it is nonzero. */ 113/* VARARGS */ 114 115void 116#if defined VA_START && __STDC__ 117error (int status, int errnum, const char *message, ...) 118#else 119error (status, errnum, message, va_alist) 120 int status; 121 int errnum; 122 char *message; 123 va_dcl 124#endif 125{ 126#ifdef VA_START 127 va_list args; 128#endif 129 130 if (error_print_progname) 131 (*error_print_progname) (); 132 else 133 { 134 fflush (stdout); 135 fprintf (stderr, "%s: ", program_name); 136 } 137 138#ifdef VA_START 139 VA_START (args, message); 140# if HAVE_VPRINTF || _LIBC 141 vfprintf (stderr, message, args); 142# else 143 _doprnt (message, args, stderr); 144# endif 145 va_end (args); 146#else 147 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8); 148#endif 149 150 ++error_message_count; 151 if (errnum) 152 { 153#if defined HAVE_STRERROR_R || defined _LIBC 154 char errbuf[1024]; 155 /* Don't use __strerror_r's return value because on some systems 156 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */ 157 __strerror_r (errnum, errbuf, sizeof errbuf); 158 fprintf (stderr, ": %s", errbuf); 159#else 160 fprintf (stderr, ": %s", strerror (errnum)); 161#endif 162 } 163 putc ('\n', stderr); 164 fflush (stderr); 165 if (status) 166 exit (status); 167} 168 169/* Sometimes we want to have at most one error per line. This 170 variable controls whether this mode is selected or not. */ 171int error_one_per_line; 172 173void 174#if defined VA_START && __STDC__ 175error_at_line (int status, int errnum, const char *file_name, 176 unsigned int line_number, const char *message, ...) 177#else 178error_at_line (status, errnum, file_name, line_number, message, va_alist) 179 int status; 180 int errnum; 181 const char *file_name; 182 unsigned int line_number; 183 char *message; 184 va_dcl 185#endif 186{ 187#ifdef VA_START 188 va_list args; 189#endif 190 191 if (error_one_per_line) 192 { 193 static const char *old_file_name; 194 static unsigned int old_line_number; 195 196 if (old_line_number == line_number && 197 (file_name == old_file_name || !strcmp (old_file_name, file_name))) 198 /* Simply return and print nothing. */ 199 return; 200 201 old_file_name = file_name; 202 old_line_number = line_number; 203 } 204 205 if (error_print_progname) 206 (*error_print_progname) (); 207 else 208 { 209 fflush (stdout); 210 fprintf (stderr, "%s:", program_name); 211 } 212 213 if (file_name != NULL) 214 fprintf (stderr, "%s:%d: ", file_name, line_number); 215 216#ifdef VA_START 217 VA_START (args, message); 218# if HAVE_VPRINTF || _LIBC 219 vfprintf (stderr, message, args); 220# else 221 _doprnt (message, args, stderr); 222# endif 223 va_end (args); 224#else 225 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8); 226#endif 227 228 ++error_message_count; 229 if (errnum) 230 { 231#if defined HAVE_STRERROR_R || defined _LIBC 232 char errbuf[1024]; 233 fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf)); 234#else 235 fprintf (stderr, ": %s", strerror (errnum)); 236#endif 237 } 238 putc ('\n', stderr); 239 fflush (stderr); 240 if (status) 241 exit (status); 242} 243 244#ifdef _LIBC 245/* Make the weak alias. */ 246# undef error 247# undef error_at_line 248weak_alias (__error, error) 249weak_alias (__error_at_line, error_at_line) 250#endif 251