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annotate Python/fileutils.c @ 65165:2147cc152227

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_Py_stat() and _Py_fopen(): avoid PyUnicode_AsWideCharString() on Windows On Windows, Py_UNICODE is wchar_t, so we can avoid the expensive Py_UNICODE* => wchar_t* conversion.
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 07 Oct 2010 22:23:10 +0000
parents 1f3919af8a53
children 8fd5d06462e6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
65162
39014f0abc32 Create fileutils.c/.h
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1 #include "Python.h"
65164
1f3919af8a53 Fix fileutils for Windows
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2 #ifdef MS_WINDOWS
1f3919af8a53 Fix fileutils for Windows
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3 # include <windows.h>
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4 #endif
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5
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6 #ifdef HAVE_STAT
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7
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8 /* Decode a byte string from the locale encoding with the
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9 surrogateescape error handler (undecodable bytes are decoded as characters
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10 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
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11 character, escape the bytes using the surrogateescape error handler instead
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12 of decoding them.
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13
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14 Use _Py_wchar2char() to encode the character string back to a byte string.
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15
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16 Return a pointer to a newly allocated (wide) character string (use
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17 PyMem_Free() to free the memory), or NULL on error (conversion error or
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18 memory error). */
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19 wchar_t*
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20 _Py_char2wchar(char* arg)
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21 {
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22 wchar_t *res;
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23 #ifdef HAVE_BROKEN_MBSTOWCS
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24 /* Some platforms have a broken implementation of
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25 * mbstowcs which does not count the characters that
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26 * would result from conversion. Use an upper bound.
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27 */
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28 size_t argsize = strlen(arg);
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29 #else
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30 size_t argsize = mbstowcs(NULL, arg, 0);
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31 #endif
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32 size_t count;
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33 unsigned char *in;
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34 wchar_t *out;
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35 #ifdef HAVE_MBRTOWC
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36 mbstate_t mbs;
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37 #endif
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38 if (argsize != (size_t)-1) {
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39 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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40 if (!res)
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41 goto oom;
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42 count = mbstowcs(res, arg, argsize+1);
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43 if (count != (size_t)-1) {
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44 wchar_t *tmp;
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45 /* Only use the result if it contains no
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46 surrogate characters. */
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47 for (tmp = res; *tmp != 0 &&
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48 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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49 ;
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50 if (*tmp == 0)
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51 return res;
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52 }
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53 PyMem_Free(res);
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54 }
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55 /* Conversion failed. Fall back to escaping with surrogateescape. */
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56 #ifdef HAVE_MBRTOWC
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57 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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58
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59 /* Overallocate; as multi-byte characters are in the argument, the
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60 actual output could use less memory. */
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61 argsize = strlen(arg) + 1;
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62 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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63 if (!res) goto oom;
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64 in = (unsigned char*)arg;
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65 out = res;
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66 memset(&mbs, 0, sizeof mbs);
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67 while (argsize) {
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68 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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69 if (converted == 0)
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70 /* Reached end of string; null char stored. */
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71 break;
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72 if (converted == (size_t)-2) {
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73 /* Incomplete character. This should never happen,
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74 since we provide everything that we have -
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75 unless there is a bug in the C library, or I
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76 misunderstood how mbrtowc works. */
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77 fprintf(stderr, "unexpected mbrtowc result -2\n");
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78 return NULL;
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79 }
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80 if (converted == (size_t)-1) {
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81 /* Conversion error. Escape as UTF-8b, and start over
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82 in the initial shift state. */
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83 *out++ = 0xdc00 + *in++;
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84 argsize--;
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85 memset(&mbs, 0, sizeof mbs);
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86 continue;
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87 }
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88 if (*out >= 0xd800 && *out <= 0xdfff) {
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89 /* Surrogate character. Escape the original
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90 byte sequence with surrogateescape. */
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91 argsize -= converted;
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92 while (converted--)
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93 *out++ = 0xdc00 + *in++;
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94 continue;
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95 }
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96 /* successfully converted some bytes */
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97 in += converted;
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98 argsize -= converted;
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99 out++;
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100 }
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101 #else
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102 /* Cannot use C locale for escaping; manually escape as if charset
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103 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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104 correctly in the locale's charset, which must be an ASCII superset. */
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105 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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106 if (!res) goto oom;
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107 in = (unsigned char*)arg;
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108 out = res;
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109 while(*in)
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110 if(*in < 128)
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111 *out++ = *in++;
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112 else
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113 *out++ = 0xdc00 + *in++;
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114 *out = 0;
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115 #endif
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116 return res;
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117 oom:
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118 fprintf(stderr, "out of memory\n");
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119 return NULL;
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120 }
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121
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122 /* Encode a (wide) character string to the locale encoding with the
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123 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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124 converted to bytes 0x80..0xFF).
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125
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126 This function is the reverse of _Py_char2wchar().
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127
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128 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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129 the memory), or NULL on error (conversion error or memory error). */
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130 char*
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131 _Py_wchar2char(const wchar_t *text)
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132 {
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133 const size_t len = wcslen(text);
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134 char *result = NULL, *bytes = NULL;
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135 size_t i, size, converted;
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136 wchar_t c, buf[2];
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137
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138 /* The function works in two steps:
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139 1. compute the length of the output buffer in bytes (size)
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140 2. outputs the bytes */
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141 size = 0;
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142 buf[1] = 0;
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143 while (1) {
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144 for (i=0; i < len; i++) {
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145 c = text[i];
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146 if (c >= 0xdc80 && c <= 0xdcff) {
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147 /* UTF-8b surrogate */
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148 if (bytes != NULL) {
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149 *bytes++ = c - 0xdc00;
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150 size--;
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151 }
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152 else
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153 size++;
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154 continue;
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155 }
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156 else {
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157 buf[0] = c;
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158 if (bytes != NULL)
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159 converted = wcstombs(bytes, buf, size);
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160 else
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161 converted = wcstombs(NULL, buf, 0);
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162 if (converted == (size_t)-1) {
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163 if (result != NULL)
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164 PyMem_Free(result);
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165 return NULL;
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166 }
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167 if (bytes != NULL) {
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168 bytes += converted;
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169 size -= converted;
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170 }
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171 else
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172 size += converted;
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173 }
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174 }
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175 if (result != NULL) {
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176 *bytes = 0;
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177 break;
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178 }
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179
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180 size += 1; /* nul byte at the end */
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181 result = PyMem_Malloc(size);
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182 if (result == NULL)
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183 return NULL;
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184 bytes = result;
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185 }
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186 return result;
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187 }
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188
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189 /* In principle, this should use HAVE__WSTAT, and _wstat
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190 should be detected by autoconf. However, no current
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191 POSIX system provides that function, so testing for
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192 it is pointless.
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193 Not sure whether the MS_WINDOWS guards are necessary:
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194 perhaps for cygwin/mingw builds?
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195 */
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196 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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197 int
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198 _Py_wstat(const wchar_t* path, struct stat *buf)
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199 {
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200 int err;
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201 char *fname;
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202 fname = _Py_wchar2char(path);
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203 if (fname == NULL) {
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204 errno = EINVAL;
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205 return -1;
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206 }
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207 err = stat(fname, buf);
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208 PyMem_Free(fname);
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209 return err;
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210 }
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211 #endif
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212
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213 /* Call _wstat() on Windows, or stat() otherwise. Only fill st_mode
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214 attribute on Windows. Return 0 on success, -1 on stat error or (if
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215 PyErr_Occurred()) unicode error. */
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216
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217 int
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218 _Py_stat(PyObject *path, struct stat *statbuf)
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219 {
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220 #ifdef MS_WINDOWS
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221 int err;
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222 struct _stat wstatbuf;
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223
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224 err = _wstat(PyUnicode_AS_UNICODE(path), &wstatbuf);
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225 if (!err)
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226 statbuf->st_mode = wstatbuf.st_mode;
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227 return err;
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228 #else
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229 int ret;
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230 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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231 if (bytes == NULL)
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232 return -1;
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233 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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234 Py_DECREF(bytes);
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235 return ret;
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236 #endif
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237 }
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238
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239 FILE *
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240 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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241 {
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242 #ifndef MS_WINDOWS
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243 FILE *f;
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244 char *cpath;
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245 char cmode[10];
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246 size_t r;
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247 r = wcstombs(cmode, mode, 10);
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248 if (r == (size_t)-1 || r >= 10) {
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249 errno = EINVAL;
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250 return NULL;
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251 }
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252 cpath = _Py_wchar2char(path);
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253 if (cpath == NULL)
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254 return NULL;
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255 f = fopen(cpath, cmode);
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256 PyMem_Free(cpath);
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257 return f;
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diff changeset
258 #else
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259 return _wfopen(path, mode);
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260 #endif
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261 }
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262
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263 /* Call _wfopen() on Windows, or fopen() otherwise. Return the new file
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264 object on success, or NULL if the file cannot be open or (if
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265 PyErr_Occurred()) on unicode error */
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266
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267 FILE*
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268 _Py_fopen(PyObject *path, const char *mode)
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269 {
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270 #ifdef MS_WINDOWS
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271 wchar_t wmode[10];
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272 int usize;
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273
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274 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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275 if (usize == 0)
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276 return NULL;
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277
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278 return _wfopen(PyUnicode_AS_UNICODE(path), wmode);
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279 #else
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280 FILE *f;
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281 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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282 if (bytes == NULL)
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283 return NULL;
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284 f = fopen(PyBytes_AS_STRING(bytes), mode);
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285 Py_DECREF(bytes);
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286 return f;
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287 #endif
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288 }
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289
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290 #ifdef HAVE_READLINK
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291 int
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292 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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293 {
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294 char *cpath;
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295 char cbuf[PATH_MAX];
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diff changeset
296 int res;
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297 size_t r1;
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298
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299 cpath = _Py_wchar2char(path);
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300 if (cpath == NULL) {
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301 errno = EINVAL;
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302 return -1;
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303 }
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304 res = (int)readlink(cpath, cbuf, PATH_MAX);
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305 PyMem_Free(cpath);
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306 if (res == -1)
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307 return -1;
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308 if (res == PATH_MAX) {
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309 errno = EINVAL;
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310 return -1;
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311 }
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312 cbuf[res] = '\0'; /* buf will be null terminated */
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313 r1 = mbstowcs(buf, cbuf, bufsiz);
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314 if (r1 == -1) {
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315 errno = EINVAL;
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316 return -1;
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317 }
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318 return (int)r1;
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319 }
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320 #endif
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321
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322 #ifdef HAVE_REALPATH
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323 wchar_t*
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324 _Py_wrealpath(const wchar_t *path, wchar_t *resolved_path)
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325 {
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326 char *cpath;
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327 char cresolved_path[PATH_MAX];
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328 char *res;
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329 size_t r;
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330 cpath = _Py_wchar2char(path);
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331 if (cpath == NULL) {
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332 errno = EINVAL;
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333 return NULL;
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334 }
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335 res = realpath(cpath, cresolved_path);
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336 PyMem_Free(cpath);
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337 if (res == NULL)
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338 return NULL;
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339 r = mbstowcs(resolved_path, cresolved_path, PATH_MAX);
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340 if (r == (size_t)-1 || r >= PATH_MAX) {
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341 errno = EINVAL;
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342 return NULL;
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343 }
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344 return resolved_path;
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345 }
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346 #endif
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347
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348 wchar_t*
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349 _Py_wgetcwd(wchar_t *buf, size_t size)
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350 {
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351 #ifdef MS_WINDOWS
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352 return _wgetcwd(buf, size);
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353 #else
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354 char fname[PATH_MAX];
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355 if (getcwd(fname, PATH_MAX) == NULL)
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356 return NULL;
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357 if (mbstowcs(buf, fname, size) >= size) {
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358 errno = ERANGE;
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359 return NULL;
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parents:
diff changeset
360 }
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361 return buf;
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362 #endif
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363 }
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364
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365 #endif