Mercurial > cpython-lru_cache-weakref

annotate Python/fileutils.c @ 70889:2d62ee4e7d98

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use a invalid name for the __class__ closure for super() (closes #12370) This prevents the assignment of __class__ in the class body from breaking super. (Although a determined person could do locals()["@__class__"] = 4)
author Benjamin Peterson <benjamin@python.org>
date Sun, 19 Jun 2011 19:42:22 -0500
parents 76a1c5e88352
children c838c9b117f1 94a38ad4aebf
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1 #include "Python.h"
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2 #ifdef MS_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) and write the number of written wide
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18 characters excluding the null character into *size if size is not NULL, or
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19 NULL on error (conversion or memory allocation error).
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20
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21 Conversion errors should never happen, unless there is a bug in the C
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22 library. */
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23 wchar_t*
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24 _Py_char2wchar(const char* arg, size_t *size)
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25 {
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26 wchar_t *res;
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27 #ifdef HAVE_BROKEN_MBSTOWCS
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28 /* Some platforms have a broken implementation of
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29 * mbstowcs which does not count the characters that
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30 * would result from conversion. Use an upper bound.
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31 */
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32 size_t argsize = strlen(arg);
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33 #else
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34 size_t argsize = mbstowcs(NULL, arg, 0);
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35 #endif
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36 size_t count;
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37 unsigned char *in;
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38 wchar_t *out;
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39 #ifdef HAVE_MBRTOWC
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40 mbstate_t mbs;
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41 #endif
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42 if (argsize != (size_t)-1) {
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43 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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44 if (!res)
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45 goto oom;
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46 count = mbstowcs(res, arg, argsize+1);
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47 if (count != (size_t)-1) {
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48 wchar_t *tmp;
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49 /* Only use the result if it contains no
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50 surrogate characters. */
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51 for (tmp = res; *tmp != 0 &&
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52 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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53 ;
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54 if (*tmp == 0) {
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55 if (size != NULL)
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56 *size = count;
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57 return res;
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58 }
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59 }
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60 PyMem_Free(res);
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61 }
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62 /* Conversion failed. Fall back to escaping with surrogateescape. */
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63 #ifdef HAVE_MBRTOWC
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64 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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65
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66 /* Overallocate; as multi-byte characters are in the argument, the
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67 actual output could use less memory. */
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68 argsize = strlen(arg) + 1;
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69 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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70 if (!res)
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71 goto oom;
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72 in = (unsigned char*)arg;
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73 out = res;
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74 memset(&mbs, 0, sizeof mbs);
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75 while (argsize) {
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76 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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77 if (converted == 0)
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78 /* Reached end of string; null char stored. */
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79 break;
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80 if (converted == (size_t)-2) {
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81 /* Incomplete character. This should never happen,
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82 since we provide everything that we have -
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83 unless there is a bug in the C library, or I
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84 misunderstood how mbrtowc works. */
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85 fprintf(stderr, "unexpected mbrtowc result -2\n");
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86 PyMem_Free(res);
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87 return NULL;
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88 }
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89 if (converted == (size_t)-1) {
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90 /* Conversion error. Escape as UTF-8b, and start over
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91 in the initial shift state. */
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92 *out++ = 0xdc00 + *in++;
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93 argsize--;
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94 memset(&mbs, 0, sizeof mbs);
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95 continue;
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96 }
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97 if (*out >= 0xd800 && *out <= 0xdfff) {
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98 /* Surrogate character. Escape the original
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99 byte sequence with surrogateescape. */
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100 argsize -= converted;
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101 while (converted--)
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102 *out++ = 0xdc00 + *in++;
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103 continue;
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104 }
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105 /* successfully converted some bytes */
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106 in += converted;
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107 argsize -= converted;
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108 out++;
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109 }
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110 #else
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111 /* Cannot use C locale for escaping; manually escape as if charset
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112 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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113 correctly in the locale's charset, which must be an ASCII superset. */
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114 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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115 if (!res) goto oom;
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116 in = (unsigned char*)arg;
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117 out = res;
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118 while(*in)
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119 if(*in < 128)
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120 *out++ = *in++;
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121 else
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122 *out++ = 0xdc00 + *in++;
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123 *out = 0;
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124 #endif
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125 if (size != NULL)
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126 *size = out - res;
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127 return res;
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128 oom:
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129 fprintf(stderr, "out of memory\n");
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130 return NULL;
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131 }
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132
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133 /* Encode a (wide) character string to the locale encoding with the
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134 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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135 converted to bytes 0x80..0xFF).
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136
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137 This function is the reverse of _Py_char2wchar().
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138
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139 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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140 the memory), or NULL on conversion or memory allocation error.
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141
1b5f47e2e0f0 PyUnicode_EncodeFS() raises an exception if _Py_wchar2char() fails
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142 If error_pos is not NULL: *error_pos is the index of the invalid character
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143 on conversion error, or (size_t)-1 otherwise. */
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144 char*
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145 _Py_wchar2char(const wchar_t *text, size_t *error_pos)
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146 {
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147 const size_t len = wcslen(text);
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148 char *result = NULL, *bytes = NULL;
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149 size_t i, size, converted;
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150 wchar_t c, buf[2];
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151
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152 if (error_pos != NULL)
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153 *error_pos = (size_t)-1;
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154
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155 /* The function works in two steps:
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156 1. compute the length of the output buffer in bytes (size)
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157 2. outputs the bytes */
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158 size = 0;
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159 buf[1] = 0;
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160 while (1) {
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161 for (i=0; i < len; i++) {
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162 c = text[i];
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163 if (c >= 0xdc80 && c <= 0xdcff) {
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164 /* UTF-8b surrogate */
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165 if (bytes != NULL) {
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166 *bytes++ = c - 0xdc00;
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167 size--;
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168 }
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169 else
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170 size++;
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171 continue;
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172 }
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173 else {
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174 buf[0] = c;
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175 if (bytes != NULL)
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176 converted = wcstombs(bytes, buf, size);
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177 else
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178 converted = wcstombs(NULL, buf, 0);
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179 if (converted == (size_t)-1) {
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180 if (result != NULL)
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181 PyMem_Free(result);
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182 if (error_pos != NULL)
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183 *error_pos = i;
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184 return NULL;
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185 }
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186 if (bytes != NULL) {
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187 bytes += converted;
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188 size -= converted;
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189 }
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190 else
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191 size += converted;
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192 }
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193 }
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194 if (result != NULL) {
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195 *bytes = 0;
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196 break;
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197 }
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198
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199 size += 1; /* nul byte at the end */
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200 result = PyMem_Malloc(size);
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201 if (result == NULL)
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202 return NULL;
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203 bytes = result;
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204 }
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205 return result;
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206 }
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207
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208 /* In principle, this should use HAVE__WSTAT, and _wstat
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209 should be detected by autoconf. However, no current
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210 POSIX system provides that function, so testing for
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211 it is pointless.
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212 Not sure whether the MS_WINDOWS guards are necessary:
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213 perhaps for cygwin/mingw builds?
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214 */
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215 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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216
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217 /* Get file status. Encode the path to the locale encoding. */
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218
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219 int
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220 _Py_wstat(const wchar_t* path, struct stat *buf)
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221 {
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222 int err;
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223 char *fname;
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224 fname = _Py_wchar2char(path, NULL);
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225 if (fname == NULL) {
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226 errno = EINVAL;
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227 return -1;
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228 }
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229 err = stat(fname, buf);
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230 PyMem_Free(fname);
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231 return err;
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232 }
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233 #endif
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234
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235 /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
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236 call stat() otherwise. Only fill st_mode attribute on Windows.
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237
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238 Return 0 on success, -1 on _wstat() / stat() error or (if PyErr_Occurred())
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239 unicode error. */
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240
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241 int
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242 _Py_stat(PyObject *path, struct stat *statbuf)
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243 {
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244 #ifdef MS_WINDOWS
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245 int err;
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246 struct _stat wstatbuf;
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247
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248 err = _wstat(PyUnicode_AS_UNICODE(path), &wstatbuf);
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249 if (!err)
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250 statbuf->st_mode = wstatbuf.st_mode;
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251 return err;
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252 #else
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253 int ret;
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254 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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255 if (bytes == NULL)
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256 return -1;
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257 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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258 Py_DECREF(bytes);
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259 return ret;
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260 #endif
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261 }
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262
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263 /* Open a file. Use _wfopen() on Windows, encode the path to the locale
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264 encoding and use fopen() otherwise. */
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265
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266 FILE *
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267 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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268 {
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269 #ifndef MS_WINDOWS
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270 FILE *f;
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271 char *cpath;
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272 char cmode[10];
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273 size_t r;
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274 r = wcstombs(cmode, mode, 10);
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275 if (r == (size_t)-1 || r >= 10) {
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276 errno = EINVAL;
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277 return NULL;
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278 }
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279 cpath = _Py_wchar2char(path, NULL);
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280 if (cpath == NULL)
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281 return NULL;
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282 f = fopen(cpath, cmode);
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283 PyMem_Free(cpath);
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284 return f;
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285 #else
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286 return _wfopen(path, mode);
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287 #endif
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288 }
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289
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290 /* Call _wfopen() on Windows, or encode the path to the filesystem encoding and
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291 call fopen() otherwise.
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292
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293 Return the new file object on success, or NULL if the file cannot be open or
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294 (if PyErr_Occurred()) on unicode error */
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295
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296 FILE*
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297 _Py_fopen(PyObject *path, const char *mode)
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298 {
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299 #ifdef MS_WINDOWS
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300 wchar_t wmode[10];
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301 int usize;
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302
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303 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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304 if (usize == 0)
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305 return NULL;
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306
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307 return _wfopen(PyUnicode_AS_UNICODE(path), wmode);
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308 #else
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309 FILE *f;
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310 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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311 if (bytes == NULL)
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312 return NULL;
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313 f = fopen(PyBytes_AS_STRING(bytes), mode);
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314 Py_DECREF(bytes);
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315 return f;
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316 #endif
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317 }
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318
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319 #ifdef HAVE_READLINK
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320
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321 /* Read value of symbolic link. Encode the path to the locale encoding, decode
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322 the result from the locale encoding. */
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323
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324 int
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325 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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326 {
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327 char *cpath;
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328 char cbuf[PATH_MAX];
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329 wchar_t *wbuf;
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330 int res;
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331 size_t r1;
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332
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333 cpath = _Py_wchar2char(path, NULL);
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334 if (cpath == NULL) {
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335 errno = EINVAL;
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336 return -1;
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337 }
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338 res = (int)readlink(cpath, cbuf, PATH_MAX);
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339 PyMem_Free(cpath);
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340 if (res == -1)
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341 return -1;
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342 if (res == PATH_MAX) {
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343 errno = EINVAL;
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344 return -1;
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345 }
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346 cbuf[res] = '\0'; /* buf will be null terminated */
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347 wbuf = _Py_char2wchar(cbuf, &r1);
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348 if (wbuf == NULL) {
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349 errno = EINVAL;
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350 return -1;
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351 }
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352 if (bufsiz <= r1) {
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353 PyMem_Free(wbuf);
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354 errno = EINVAL;
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355 return -1;
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356 }
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357 wcsncpy(buf, wbuf, bufsiz);
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358 PyMem_Free(wbuf);
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359 return (int)r1;
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360 }
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361 #endif
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362
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363 #ifdef HAVE_REALPATH
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364
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365 /* Return the canonicalized absolute pathname. Encode path to the locale
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366 encoding, decode the result from the locale encoding. */
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367
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368 wchar_t*
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369 _Py_wrealpath(const wchar_t *path,
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370 wchar_t *resolved_path, size_t resolved_path_size)
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371 {
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372 char *cpath;
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373 char cresolved_path[PATH_MAX];
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374 wchar_t *wresolved_path;
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375 char *res;
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376 size_t r;
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377 cpath = _Py_wchar2char(path, NULL);
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378 if (cpath == NULL) {
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379 errno = EINVAL;
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380 return NULL;
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381 }
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382 res = realpath(cpath, cresolved_path);
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383 PyMem_Free(cpath);
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384 if (res == NULL)
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385 return NULL;
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386
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387 wresolved_path = _Py_char2wchar(cresolved_path, &r);
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388 if (wresolved_path == NULL) {
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389 errno = EINVAL;
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390 return NULL;
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391 }
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392 if (resolved_path_size <= r) {
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393 PyMem_Free(wresolved_path);
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394 errno = EINVAL;
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395 return NULL;
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396 }
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397 wcsncpy(resolved_path, wresolved_path, resolved_path_size);
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398 PyMem_Free(wresolved_path);
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399 return resolved_path;
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400 }
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401 #endif
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402
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403 /* Get the current directory. size is the buffer size in wide characters
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diff changeset
404 including the null character. Decode the path from the locale encoding. */
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405
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406 wchar_t*
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407 _Py_wgetcwd(wchar_t *buf, size_t size)
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408 {
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409 #ifdef MS_WINDOWS
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410 return _wgetcwd(buf, size);
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411 #else
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diff changeset
412 char fname[PATH_MAX];
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diff changeset
413 wchar_t *wname;
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414 size_t len;
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diff changeset
415
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416 if (getcwd(fname, PATH_MAX) == NULL)
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417 return NULL;
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418 wname = _Py_char2wchar(fname, &len);
65312
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diff changeset
419 if (wname == NULL)
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diff changeset
420 return NULL;
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diff changeset
421 if (size <= len) {
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diff changeset
422 PyMem_Free(wname);
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423 return NULL;
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424 }
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425 wcsncpy(buf, wname, size);
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426 PyMem_Free(wname);
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427 return buf;
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428 #endif
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429 }
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430
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431 #endif