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annotate lib/rpmatch.c @ 17361:8c32877a40e6

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copy-file, rpmatch: fix problems found by cppcheck Reported by Arno Onken in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00069.html>. * lib/rpmatch.c (try): Fix memory leak. * lib/copy-file.c: Include "ignore-value.h". (qcopy_file_preserving): Ignore chown value. * modules/copy-file (Depends-on): Add ignore-value.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:30:58 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 /* Determine whether string value is affirmation or negative response
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2 according to current locale's data.
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3
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4 Copyright (C) 1996, 1998, 2000, 2002-2003, 2006-2013 Free Software
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5 Foundation, Inc.
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6
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7 This program is free software: you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your option) any later version.
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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19
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20 #include <config.h>
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21
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22 /* Specification. */
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23 #include <stdlib.h>
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24
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25 #include <stdbool.h>
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26 #include <stddef.h>
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27
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28 #if ENABLE_NLS
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29 # include <sys/types.h>
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30 # include <limits.h>
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31 # include <string.h>
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32 # if HAVE_LANGINFO_YESEXPR
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33 # include <langinfo.h>
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34 # endif
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35 # include <regex.h>
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36 # include "gettext.h"
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37 # define _(msgid) gettext (msgid)
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38 # define N_(msgid) gettext_noop (msgid)
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39
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40 # if HAVE_LANGINFO_YESEXPR
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41 /* Return the localized regular expression pattern corresponding to
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42 ENGLISH_PATTERN. NL_INDEX can be used with nl_langinfo.
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43 The resulting string may only be used until the next nl_langinfo call. */
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44 static const char *
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45 localized_pattern (const char *english_pattern, nl_item nl_index,
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46 bool posixly_correct)
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47 {
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48 const char *translated_pattern;
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49
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50 /* We prefer to get the patterns from a PO file. It would be possible to
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51 always use nl_langinfo (YESEXPR) instead of _("^[yY]"), and
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52 nl_langinfo (NOEXPR) instead of _("^[nN]"), if we could assume that the
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53 system's locale support is good. But this is not the case e.g. on Cygwin.
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54 The localizations of gnulib.pot are of better quality in general.
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55 Also, if we use locale info from non-free systems that don't have a
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56 'localedef' command, we deprive the users of the freedom to localize
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57 this pattern for their preferred language.
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58 But some programs, such as 'cp', 'mv', 'rm', 'find', 'xargs', are
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59 specified by POSIX to use nl_langinfo (YESEXPR). We implement this
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60 behaviour if POSIXLY_CORRECT is set, for the sake of these programs. */
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61
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62 /* If the user wants strict POSIX compliance, use nl_langinfo. */
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63 if (posixly_correct)
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64 {
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65 translated_pattern = nl_langinfo (nl_index);
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66 /* Check against a broken system return value. */
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67 if (translated_pattern != NULL && translated_pattern[0] != '\0')
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68 return translated_pattern;
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69 }
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70
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71 /* Look in the gnulib message catalog. */
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72 translated_pattern = _(english_pattern);
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73 if (translated_pattern == english_pattern)
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74 {
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75 /* The gnulib message catalog provides no translation.
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76 Try the system's message catalog. */
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77 translated_pattern = nl_langinfo (nl_index);
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78 /* Check against a broken system return value. */
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79 if (translated_pattern != NULL && translated_pattern[0] != '\0')
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80 return translated_pattern;
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81 /* Fall back to English. */
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82 translated_pattern = english_pattern;
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83 }
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84 return translated_pattern;
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85 }
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86 # else
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87 # define localized_pattern(english_pattern,nl_index,posixly_correct) \
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88 _(english_pattern)
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89 # endif
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90
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91 static int
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92 try (const char *response, const char *pattern, char **lastp, regex_t *re)
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93 {
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94 if (*lastp == NULL || strcmp (pattern, *lastp) != 0)
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95 {
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96 char *safe_pattern;
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97
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98 /* The pattern has changed. */
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99 if (*lastp != NULL)
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100 {
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101 /* Free the old compiled pattern. */
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102 regfree (re);
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103 free (*lastp);
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104 *lastp = NULL;
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105 }
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106 /* Put the PATTERN into safe memory before calling regcomp.
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107 (regcomp may call nl_langinfo, overwriting PATTERN's storage. */
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108 safe_pattern = strdup (pattern);
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109 if (safe_pattern == NULL)
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110 return -1;
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111 /* Compile the pattern and cache it for future runs. */
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112 if (regcomp (re, safe_pattern, REG_EXTENDED) != 0)
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113 {
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114 free (safe_pattern);
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115 return -1;
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116 }
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117 *lastp = safe_pattern;
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118 }
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119
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120 /* See if the regular expression matches RESPONSE. */
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121 return regexec (re, response, 0, NULL, 0) == 0;
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122 }
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123 #endif
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125
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126 int
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127 rpmatch (const char *response)
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128 {
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129 #if ENABLE_NLS
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130 /* Match against one of the response patterns, compiling the pattern
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131 first if necessary. */
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132
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133 /* We cache the response patterns and compiled regexps here. */
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134 static char *last_yesexpr, *last_noexpr;
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135 static regex_t cached_yesre, cached_nore;
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136
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137 # if HAVE_LANGINFO_YESEXPR
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138 bool posixly_correct = (getenv ("POSIXLY_CORRECT") != NULL);
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139 # endif
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140
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141 const char *yesexpr, *noexpr;
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142 int result;
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143
10000
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144 /* TRANSLATORS: A regular expression testing for an affirmative answer
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145 (english: "yes"). Testing the first character may be sufficient.
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146 Take care to consider upper and lower case.
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147 To enquire the regular expression that your system uses for this
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148 purpose, you can use the command
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149 locale -k LC_MESSAGES | grep '^yesexpr=' */
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150 yesexpr = localized_pattern (N_("^[yY]"), YESEXPR, posixly_correct);
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151 result = try (response, yesexpr, &last_yesexpr, &cached_yesre);
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152 if (result < 0)
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153 return -1;
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154 if (result)
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155 return 1;
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156
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157 /* TRANSLATORS: A regular expression testing for a negative answer
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158 (english: "no"). Testing the first character may be sufficient.
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159 Take care to consider upper and lower case.
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160 To enquire the regular expression that your system uses for this
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161 purpose, you can use the command
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162 locale -k LC_MESSAGES | grep '^noexpr=' */
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163 noexpr = localized_pattern (N_("^[nN]"), NOEXPR, posixly_correct);
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164 result = try (response, noexpr, &last_noexpr, &cached_nore);
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165 if (result < 0)
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166 return -1;
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167 if (result)
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168 return 0;
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169
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170 return -1;
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171 #else
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172 /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
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173 return (*response == 'y' || *response == 'Y' ? 1
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174 : *response == 'n' || *response == 'N' ? 0 : -1);
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175 #endif
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176 }