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272
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1 /* Error handler for noninteractive utilities
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2 Copyright (C) 1990-1998, 2000-2007 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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19
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20 #if !_LIBC
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21 # include <config.h>
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22 #endif
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23
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24 #include "error.h"
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25
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26 #include <stdarg.h>
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27 #include <stdio.h>
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28 #include <stdlib.h>
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29 #include <string.h>
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30
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31 #if !_LIBC && ENABLE_NLS
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32 # include "gettext.h"
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33 # define _(msgid) gettext (msgid)
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34 #endif
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35
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36 #ifdef _LIBC
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37 # include <libintl.h>
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38 # include <stdbool.h>
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39 # include <stdint.h>
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40 # include <wchar.h>
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41 # define mbsrtowcs __mbsrtowcs
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42 #endif
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43
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44 #if USE_UNLOCKED_IO
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45 # include "unlocked-io.h"
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46 #endif
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47
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48 #ifndef _
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49 # define _(String) String
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50 #endif
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51
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52 /* If NULL, error will flush stdout, then print on stderr the program
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53 name, a colon and a space. Otherwise, error will call this
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54 function without parameters instead. */
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55 void (*error_print_progname) (void);
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56
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57 /* This variable is incremented each time `error' is called. */
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58 unsigned int error_message_count;
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59
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60 #ifdef _LIBC
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61 /* In the GNU C library, there is a predefined variable for this. */
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62
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63 # define program_name program_invocation_name
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64 # include <errno.h>
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65 # include <limits.h>
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66 # include <libio/libioP.h>
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67
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68 /* In GNU libc we want do not want to use the common name `error' directly.
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69 Instead make it a weak alias. */
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70 extern void __error (int status, int errnum, const char *message, ...)
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71 __attribute__ ((__format__ (__printf__, 3, 4)));
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72 extern void __error_at_line (int status, int errnum, const char *file_name,
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73 unsigned int line_number, const char *message,
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74 ...)
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75 __attribute__ ((__format__ (__printf__, 5, 6)));;
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76 # define error __error
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77 # define error_at_line __error_at_line
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78
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79 # include <libio/iolibio.h>
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80 # define fflush(s) INTUSE(_IO_fflush) (s)
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81 # undef putc
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82 # define putc(c, fp) INTUSE(_IO_putc) (c, fp)
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83
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84 # include <bits/libc-lock.h>
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85
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86 #else /* not _LIBC */
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87
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88 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
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89 # ifndef HAVE_DECL_STRERROR_R
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90 "this configure-time declaration test was not run"
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91 # endif
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92 char *strerror_r ();
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93 # endif
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94
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95 /* The calling program should define program_name and set it to the
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96 name of the executing program. */
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97 extern char *program_name;
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98
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99 # if HAVE_STRERROR_R || defined strerror_r
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100 # define __strerror_r strerror_r
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101 # endif /* HAVE_STRERROR_R || defined strerror_r */
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102 #endif /* not _LIBC */
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103
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104 static void
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105 print_errno_message (int errnum)
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106 {
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107 char const *s;
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108
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109 #if defined HAVE_STRERROR_R || _LIBC
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110 char errbuf[1024];
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111 # if STRERROR_R_CHAR_P || _LIBC
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112 s = __strerror_r (errnum, errbuf, sizeof errbuf);
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113 # else
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114 if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
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115 s = errbuf;
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116 else
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117 s = 0;
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118 # endif
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119 #else
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120 s = strerror (errnum);
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121 #endif
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122
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123 #if !_LIBC
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124 if (! s)
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125 s = _("Unknown system error");
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126 #endif
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127
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128 #if _LIBC
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129 __fxprintf (NULL, ": %s", s);
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130 #else
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131 fprintf (stderr, ": %s", s);
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132 #endif
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133 }
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134
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135 static void
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136 error_tail (int status, int errnum, const char *message, va_list args)
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137 {
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138 #if _LIBC
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139 if (_IO_fwide (stderr, 0) > 0)
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140 {
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141 # define ALLOCA_LIMIT 2000
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142 size_t len = strlen (message) + 1;
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143 wchar_t *wmessage = NULL;
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144 mbstate_t st;
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145 size_t res;
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146 const char *tmp;
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147 bool use_malloc = false;
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148
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149 while (1)
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150 {
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151 if (__libc_use_alloca (len * sizeof (wchar_t)))
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152 wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
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153 else
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154 {
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155 if (!use_malloc)
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156 wmessage = NULL;
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157
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158 wchar_t *p = (wchar_t *) realloc (wmessage,
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159 len * sizeof (wchar_t));
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160 if (p == NULL)
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161 {
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162 free (wmessage);
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163 fputws_unlocked (L"out of memory\n", stderr);
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164 return;
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165 }
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166 wmessage = p;
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167 use_malloc = true;
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168 }
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169
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170 memset (&st, '\0', sizeof (st));
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171 tmp = message;
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172
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173 res = mbsrtowcs (wmessage, &tmp, len, &st);
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174 if (res != len)
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175 break;
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176
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177 if (__builtin_expect (len >= SIZE_MAX / 2, 0))
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178 {
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179 /* This really should not happen if everything is fine. */
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180 res = (size_t) -1;
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181 break;
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182 }
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183
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184 len *= 2;
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185 }
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186
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187 if (res == (size_t) -1)
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188 {
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189 /* The string cannot be converted. */
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190 if (use_malloc)
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191 {
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192 free (wmessage);
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193 use_malloc = false;
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194 }
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195 wmessage = (wchar_t *) L"???";
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196 }
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197
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198 __vfwprintf (stderr, wmessage, args);
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199
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200 if (use_malloc)
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201 free (wmessage);
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202 }
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203 else
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204 #endif
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205 vfprintf (stderr, message, args);
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206 va_end (args);
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207
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208 ++error_message_count;
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209 if (errnum)
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210 print_errno_message (errnum);
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211 #if _LIBC
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212 __fxprintf (NULL, "\n");
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213 #else
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214 putc ('\n', stderr);
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215 #endif
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216 fflush (stderr);
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217 if (status)
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218 exit (status);
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219 }
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220
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221
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222 /* Print the program name and error message MESSAGE, which is a printf-style
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223 format string with optional args.
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224 If ERRNUM is nonzero, print its corresponding system error message.
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225 Exit with status STATUS if it is nonzero. */
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226 void
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227 error (int status, int errnum, const char *message, ...)
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228 {
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229 va_list args;
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230
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231 #if defined _LIBC && defined __libc_ptf_call
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232 /* We do not want this call to be cut short by a thread
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233 cancellation. Therefore disable cancellation for now. */
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234 int state = PTHREAD_CANCEL_ENABLE;
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235 __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
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236 0);
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237 #endif
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238
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239 fflush (stdout);
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240 #ifdef _LIBC
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241 _IO_flockfile (stderr);
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242 #endif
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243 if (error_print_progname)
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244 (*error_print_progname) ();
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245 else
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246 {
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247 #if _LIBC
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248 __fxprintf (NULL, "%s: ", program_name);
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249 #else
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250 fprintf (stderr, "%s: ", program_name);
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251 #endif
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252 }
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253
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254 va_start (args, message);
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255 error_tail (status, errnum, message, args);
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256
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257 #ifdef _LIBC
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258 _IO_funlockfile (stderr);
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259 # ifdef __libc_ptf_call
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260 __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
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261 # endif
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262 #endif
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263 }
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264
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265 /* Sometimes we want to have at most one error per line. This
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266 variable controls whether this mode is selected or not. */
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267 int error_one_per_line;
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268
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269 void
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270 error_at_line (int status, int errnum, const char *file_name,
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271 unsigned int line_number, const char *message, ...)
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272 {
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273 va_list args;
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274
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275 if (error_one_per_line)
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276 {
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277 static const char *old_file_name;
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278 static unsigned int old_line_number;
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279
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280 if (old_line_number == line_number
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281 && (file_name == old_file_name
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282 || strcmp (old_file_name, file_name) == 0))
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283 /* Simply return and print nothing. */
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284 return;
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285
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286 old_file_name = file_name;
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287 old_line_number = line_number;
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288 }
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289
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290 #if defined _LIBC && defined __libc_ptf_call
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291 /* We do not want this call to be cut short by a thread
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292 cancellation. Therefore disable cancellation for now. */
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293 int state = PTHREAD_CANCEL_ENABLE;
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294 __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
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295 0);
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296 #endif
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297
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298 fflush (stdout);
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299 #ifdef _LIBC
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300 _IO_flockfile (stderr);
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301 #endif
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302 if (error_print_progname)
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303 (*error_print_progname) ();
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304 else
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305 {
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306 #if _LIBC
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307 __fxprintf (NULL, "%s:", program_name);
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308 #else
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309 fprintf (stderr, "%s:", program_name);
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310 #endif
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311 }
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312
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313 #if _LIBC
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314 __fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
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315 file_name, line_number);
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316 #else
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317 fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
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318 file_name, line_number);
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319 #endif
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320
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321 va_start (args, message);
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322 error_tail (status, errnum, message, args);
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323
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324 #ifdef _LIBC
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325 _IO_funlockfile (stderr);
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326 # ifdef __libc_ptf_call
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327 __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
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328 # endif
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329 #endif
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330 }
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331
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332 #ifdef _LIBC
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333 /* Make the weak alias. */
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334 # undef error
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335 # undef error_at_line
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336 weak_alias (__error, error)
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337 weak_alias (__error_at_line, error_at_line)
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338 #endif
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