1 | /* Error handler for noninteractive utilities
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2 | Copyright (C) 1990-1998, 2000, 2001 Free Software Foundation, Inc.
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3 | This file is part of the GNU C Library. Its master source is NOT part of
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4 | the C library, however. The master source lives in /gd/gnu/lib.
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5 |
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6 | This program is free software; you can redistribute it and/or modify
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7 | it under the terms of the GNU General Public License as published by
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8 | the Free Software Foundation; either version 2, or (at your option)
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9 | any later version.
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10 |
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11 | This program is distributed in the hope that it will be useful,
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | GNU General Public License for more details.
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15 |
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16 | You should have received a copy of the GNU General Public License
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17 | along with this program; if not, write to the Free Software Foundation,
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18 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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19 |
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20 | /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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21 |
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22 | #ifdef HAVE_CONFIG_H
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23 | # include <config.h>
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24 | #endif
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25 |
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26 | #include <stdio.h>
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27 | #if HAVE_LIBINTL_H
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28 | # include <libintl.h>
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29 | #endif
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30 | #ifdef _LIBC
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31 | # include <wchar.h>
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32 | # define mbsrtowcs __mbsrtowcs
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33 | #endif
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34 |
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35 | #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
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36 | # if __STDC__
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37 | # include <stdarg.h>
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38 | # define VA_START(args, lastarg) va_start(args, lastarg)
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39 | # else
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40 | # include <varargs.h>
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41 | # define VA_START(args, lastarg) va_start(args)
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42 | # endif
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43 | #else
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44 | # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
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45 | # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
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46 | #endif
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47 |
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48 | #if STDC_HEADERS || _LIBC
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49 | # include <stdlib.h>
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50 | # include <string.h>
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51 | #else
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52 | void exit ();
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53 | #endif
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54 |
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55 | #include "error.h"
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56 | #include "unlocked-io.h"
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57 |
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58 | #ifndef _
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59 | # define _(String) String
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60 | #endif
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61 |
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62 | /* If NULL, error will flush stdout, then print on stderr the program
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63 | name, a colon and a space. Otherwise, error will call this
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64 | function without parameters instead. */
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65 | void (*error_print_progname) (
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66 | #if __STDC__ - 0
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67 | void
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68 | #endif
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69 | );
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70 |
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71 | /* This variable is incremented each time `error' is called. */
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72 | unsigned int error_message_count;
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73 |
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74 | #ifdef _LIBC
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75 | /* In the GNU C library, there is a predefined variable for this. */
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76 |
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77 | # define program_name program_invocation_name
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78 | # include <errno.h>
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79 |
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80 | /* In GNU libc we want do not want to use the common name `error' directly.
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81 | Instead make it a weak alias. */
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82 | extern void __error (int status, int errnum, const char *message, ...)
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83 | __attribute__ ((__format__ (__printf__, 3, 4)));
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84 | extern void __error_at_line (int status, int errnum, const char *file_name,
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85 | unsigned int line_number, const char *message,
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86 | ...)
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87 | __attribute__ ((__format__ (__printf__, 5, 6)));;
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88 | # define error __error
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89 | # define error_at_line __error_at_line
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90 |
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91 | # ifdef USE_IN_LIBIO
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92 | # include <libio/iolibio.h>
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93 | # define fflush(s) _IO_fflush (s)
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94 | # endif
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95 |
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96 | #else /* not _LIBC */
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97 |
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98 | # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
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99 | # ifndef HAVE_DECL_STRERROR_R
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100 | "this configure-time declaration test was not run"
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101 | # endif
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102 | char *strerror_r ();
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103 | # endif
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104 |
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105 | /* The calling program should define program_name and set it to the
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106 | name of the executing program. */
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107 | extern char *program_name;
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108 |
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109 | # if HAVE_STRERROR_R || defined strerror_r
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110 | # define __strerror_r strerror_r
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111 | # else
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112 | # if HAVE_STRERROR
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113 | # ifndef HAVE_DECL_STRERROR
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114 | "this configure-time declaration test was not run"
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115 | # endif
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116 | # if !HAVE_DECL_STRERROR
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117 | char *strerror ();
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118 | # endif
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119 | # else
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120 | static char *
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121 | private_strerror (int errnum)
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122 | {
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123 | extern char *sys_errlist[];
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124 | extern int sys_nerr;
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125 |
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126 | if (errnum > 0 && errnum <= sys_nerr)
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127 | return _(sys_errlist[errnum]);
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128 | return _("Unknown system error");
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129 | }
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130 | # define strerror private_strerror
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131 | # endif /* HAVE_STRERROR */
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132 | # endif /* HAVE_STRERROR_R || defined strerror_r */
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133 | #endif /* not _LIBC */
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134 |
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135 | static void
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136 | print_errno_message (int errnum)
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137 | {
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138 | char const *s;
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139 |
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140 | #if defined HAVE_STRERROR_R || _LIBC
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141 | char errbuf[1024];
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142 | # if STRERROR_R_CHAR_P || _LIBC
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143 | s = __strerror_r (errnum, errbuf, sizeof errbuf);
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144 | # else
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145 | if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
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146 | s = errbuf;
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147 | else
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148 | s = 0;
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149 | # endif
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150 | #else
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151 | s = strerror (errnum);
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152 | #endif
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153 |
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154 | #if !_LIBC
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155 | if (! s)
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156 | s = _("Unknown system error");
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157 | #endif
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158 |
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159 | #if _LIBC && USE_IN_LIBIO
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160 | if (_IO_fwide (stderr, 0) > 0)
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161 | {
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162 | __fwprintf (stderr, L": %s", s);
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163 | return;
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164 | }
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165 | #endif
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166 |
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167 | fprintf (stderr, ": %s", s);
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168 | }
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169 |
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170 | #ifdef VA_START
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171 | static void
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172 | error_tail (int status, int errnum, const char *message, va_list args)
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173 | {
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174 | # if HAVE_VPRINTF || _LIBC
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175 | # if _LIBC && USE_IN_LIBIO
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176 | if (_IO_fwide (stderr, 0) > 0)
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177 | {
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178 | # define ALLOCA_LIMIT 2000
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179 | size_t len = strlen (message) + 1;
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180 | wchar_t *wmessage = NULL;
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181 | mbstate_t st;
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182 | size_t res;
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183 | const char *tmp;
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184 |
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185 | do
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186 | {
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187 | if (len < ALLOCA_LIMIT)
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188 | wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
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189 | else
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190 | {
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191 | if (wmessage != NULL && len / 2 < ALLOCA_LIMIT)
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192 | wmessage = NULL;
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193 |
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194 | wmessage = (wchar_t *) realloc (wmessage,
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195 | len * sizeof (wchar_t));
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196 |
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197 | if (wmessage == NULL)
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198 | {
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199 | fputws_unlocked (L"out of memory\n", stderr);
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200 | return;
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201 | }
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202 | }
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203 |
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204 | memset (&st, '\0', sizeof (st));
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205 | tmp =message;
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206 | }
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207 | while ((res = mbsrtowcs (wmessage, &tmp, len, &st)) == len);
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208 |
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209 | if (res == (size_t) -1)
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210 | /* The string cannot be converted. */
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211 | wmessage = (wchar_t *) L"???";
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212 |
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213 | __vfwprintf (stderr, wmessage, args);
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214 | }
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215 | else
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216 | # endif
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217 | vfprintf (stderr, message, args);
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218 | # else
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219 | _doprnt (message, args, stderr);
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220 | # endif
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221 | va_end (args);
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222 |
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223 | ++error_message_count;
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224 | if (errnum)
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225 | print_errno_message (errnum);
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226 | # if _LIBC && USE_IN_LIBIO
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227 | if (_IO_fwide (stderr, 0) > 0)
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228 | putwc (L'\n', stderr);
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229 | else
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230 | # endif
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231 | putc ('\n', stderr);
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232 | fflush (stderr);
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233 | if (status)
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234 | exit (status);
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235 | }
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236 | #endif
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237 |
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238 |
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239 | /* Print the program name and error message MESSAGE, which is a printf-style
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240 | format string with optional args.
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241 | If ERRNUM is nonzero, print its corresponding system error message.
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242 | Exit with status STATUS if it is nonzero. */
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243 | /* VARARGS */
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244 | void
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245 | #if defined VA_START && __STDC__
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246 | error (int status, int errnum, const char *message, ...)
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247 | #else
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248 | error (status, errnum, message, va_alist)
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249 | int status;
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250 | int errnum;
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251 | char *message;
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252 | va_dcl
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253 | #endif
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254 | {
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255 | #ifdef VA_START
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256 | va_list args;
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257 | #endif
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258 |
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259 | fflush (stdout);
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260 | #ifdef _LIBC
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261 | # ifdef USE_IN_LIBIO
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262 | _IO_flockfile (stderr);
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263 | # else
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264 | __flockfile (stderr);
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265 | # endif
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266 | #endif
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267 | if (error_print_progname)
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268 | (*error_print_progname) ();
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269 | else
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270 | {
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271 | #if _LIBC && USE_IN_LIBIO
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272 | if (_IO_fwide (stderr, 0) > 0)
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273 | __fwprintf (stderr, L"%s: ", program_name);
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274 | else
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275 | #endif
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276 | fprintf (stderr, "%s: ", program_name);
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277 | }
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278 |
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279 | #ifdef VA_START
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280 | VA_START (args, message);
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281 | error_tail (status, errnum, message, args);
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282 | #else
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283 | fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
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284 |
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285 | ++error_message_count;
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286 | if (errnum)
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287 | print_errno_message (errnum);
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288 | putc ('\n', stderr);
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289 | fflush (stderr);
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290 | if (status)
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291 | exit (status);
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292 | #endif
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293 |
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294 | #ifdef _LIBC
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295 | # ifdef USE_IN_LIBIO
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296 | _IO_funlockfile (stderr);
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297 | # else
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298 | __funlockfile (stderr);
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299 | # endif
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300 | #endif
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301 | }
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302 | |
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303 |
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304 | /* Sometimes we want to have at most one error per line. This
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305 | variable controls whether this mode is selected or not. */
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306 | int error_one_per_line;
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307 |
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308 | void
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309 | #if defined VA_START && __STDC__
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310 | error_at_line (int status, int errnum, const char *file_name,
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311 | unsigned int line_number, const char *message, ...)
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312 | #else
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313 | error_at_line (status, errnum, file_name, line_number, message, va_alist)
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314 | int status;
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315 | int errnum;
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316 | const char *file_name;
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317 | unsigned int line_number;
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318 | char *message;
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319 | va_dcl
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320 | #endif
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321 | {
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322 | #ifdef VA_START
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323 | va_list args;
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324 | #endif
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325 |
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326 | if (error_one_per_line)
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327 | {
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328 | static const char *old_file_name;
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329 | static unsigned int old_line_number;
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330 |
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331 | if (old_line_number == line_number
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332 | && (file_name == old_file_name
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333 | || strcmp (old_file_name, file_name) == 0))
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334 | /* Simply return and print nothing. */
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335 | return;
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336 |
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337 | old_file_name = file_name;
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338 | old_line_number = line_number;
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339 | }
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340 |
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341 | fflush (stdout);
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342 | #ifdef _LIBC
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343 | # ifdef USE_IN_LIBIO
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344 | _IO_flockfile (stderr);
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345 | # else
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346 | __flockfile (stderr);
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347 | # endif
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348 | #endif
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349 | if (error_print_progname)
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350 | (*error_print_progname) ();
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351 | else
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352 | {
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353 | #if _LIBC && USE_IN_LIBIO
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354 | if (_IO_fwide (stderr, 0) > 0)
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355 | __fwprintf (stderr, L"%s: ", program_name);
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356 | else
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357 | #endif
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358 | fprintf (stderr, "%s:", program_name);
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359 | }
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360 |
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361 | if (file_name != NULL)
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362 | {
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363 | #if _LIBC && USE_IN_LIBIO
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364 | if (_IO_fwide (stderr, 0) > 0)
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365 | __fwprintf (stderr, L"%s:%d: ", file_name, line_number);
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366 | else
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367 | #endif
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368 | fprintf (stderr, "%s:%d: ", file_name, line_number);
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369 | }
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370 |
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371 | #ifdef VA_START
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372 | VA_START (args, message);
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373 | error_tail (status, errnum, message, args);
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374 | #else
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375 | fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
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376 |
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377 | ++error_message_count;
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378 | if (errnum)
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379 | print_errno_message (errnum);
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380 | putc ('\n', stderr);
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381 | fflush (stderr);
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382 | if (status)
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383 | exit (status);
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384 | #endif
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385 |
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386 | #ifdef _LIBC
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387 | # ifdef USE_IN_LIBIO
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388 | _IO_funlockfile (stderr);
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389 | # else
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390 | __funlockfile (stderr);
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391 | # endif
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392 | #endif
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393 | }
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394 |
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395 | #ifdef _LIBC
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396 | /* Make the weak alias. */
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397 | # undef error
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398 | # undef error_at_line
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399 | weak_alias (__error, error)
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400 | weak_alias (__error_at_line, error_at_line)
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401 | #endif
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