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annotate Python/fileutils.c @ 74364:315781cd72fa

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NULL and no exception set from tp_iternext means StopIteration
author Benjamin Peterson <benjamin@python.org>
date Fri, 13 Jan 2012 14:54:31 -0500
parents 33dea851f918
children c80d9a0bd5a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 (decoding or memory allocation error). If size is not NULL,
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20 *size is set to (size_t)-1 on memory error and (size_t)-2 on decoding
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21 error.
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22
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23 Conversion errors should never happen, unless there is a bug in the C
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24 library. */
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25 wchar_t*
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26 _Py_char2wchar(const char* arg, size_t *size)
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27 {
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28 wchar_t *res;
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29 #ifdef HAVE_BROKEN_MBSTOWCS
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30 /* Some platforms have a broken implementation of
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31 * mbstowcs which does not count the characters that
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32 * would result from conversion. Use an upper bound.
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33 */
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34 size_t argsize = strlen(arg);
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35 #else
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36 size_t argsize = mbstowcs(NULL, arg, 0);
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37 #endif
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38 size_t count;
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39 unsigned char *in;
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40 wchar_t *out;
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41 #ifdef HAVE_MBRTOWC
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42 mbstate_t mbs;
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43 #endif
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44 if (argsize != (size_t)-1) {
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45 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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46 if (!res)
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47 goto oom;
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48 count = mbstowcs(res, arg, argsize+1);
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49 if (count != (size_t)-1) {
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50 wchar_t *tmp;
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51 /* Only use the result if it contains no
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52 surrogate characters. */
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53 for (tmp = res; *tmp != 0 &&
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54 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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55 ;
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56 if (*tmp == 0) {
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57 if (size != NULL)
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58 *size = count;
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59 return res;
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60 }
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61 }
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62 PyMem_Free(res);
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63 }
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64 /* Conversion failed. Fall back to escaping with surrogateescape. */
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65 #ifdef HAVE_MBRTOWC
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66 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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67
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68 /* Overallocate; as multi-byte characters are in the argument, the
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69 actual output could use less memory. */
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70 argsize = strlen(arg) + 1;
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71 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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72 if (!res)
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73 goto oom;
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74 in = (unsigned char*)arg;
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75 out = res;
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76 memset(&mbs, 0, sizeof mbs);
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77 while (argsize) {
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78 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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79 if (converted == 0)
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80 /* Reached end of string; null char stored. */
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81 break;
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82 if (converted == (size_t)-2) {
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83 /* Incomplete character. This should never happen,
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84 since we provide everything that we have -
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85 unless there is a bug in the C library, or I
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86 misunderstood how mbrtowc works. */
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87 PyMem_Free(res);
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88 if (size != NULL)
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89 *size = (size_t)-2;
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90 return NULL;
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91 }
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92 if (converted == (size_t)-1) {
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93 /* Conversion error. Escape as UTF-8b, and start over
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94 in the initial shift state. */
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95 *out++ = 0xdc00 + *in++;
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96 argsize--;
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97 memset(&mbs, 0, sizeof mbs);
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98 continue;
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99 }
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100 if (*out >= 0xd800 && *out <= 0xdfff) {
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101 /* Surrogate character. Escape the original
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102 byte sequence with surrogateescape. */
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103 argsize -= converted;
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104 while (converted--)
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105 *out++ = 0xdc00 + *in++;
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106 continue;
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107 }
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108 /* successfully converted some bytes */
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109 in += converted;
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110 argsize -= converted;
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111 out++;
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112 }
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113 #else
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114 /* Cannot use C locale for escaping; manually escape as if charset
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115 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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116 correctly in the locale's charset, which must be an ASCII superset. */
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117 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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118 if (!res)
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119 goto oom;
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120 in = (unsigned char*)arg;
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121 out = res;
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122 while(*in)
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123 if(*in < 128)
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124 *out++ = *in++;
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125 else
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126 *out++ = 0xdc00 + *in++;
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127 *out = 0;
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128 #endif
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129 if (size != NULL)
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130 *size = out - res;
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131 return res;
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132 oom:
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133 if (size != NULL)
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134 *size = (size_t)-1;
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135 return NULL;
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136 }
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137
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138 /* Encode a (wide) character string to the locale encoding with the
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139 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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140 converted to bytes 0x80..0xFF).
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141
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142 This function is the reverse of _Py_char2wchar().
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143
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144 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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145 the memory), or NULL on encoding or memory allocation error.
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146
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147 If error_pos is not NULL: *error_pos is the index of the invalid character
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148 on encoding error, or (size_t)-1 otherwise. */
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149 char*
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150 _Py_wchar2char(const wchar_t *text, size_t *error_pos)
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151 {
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152 const size_t len = wcslen(text);
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153 char *result = NULL, *bytes = NULL;
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154 size_t i, size, converted;
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155 wchar_t c, buf[2];
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156
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157 if (error_pos != NULL)
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158 *error_pos = (size_t)-1;
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159
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160 /* The function works in two steps:
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161 1. compute the length of the output buffer in bytes (size)
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162 2. outputs the bytes */
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163 size = 0;
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164 buf[1] = 0;
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165 while (1) {
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166 for (i=0; i < len; i++) {
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167 c = text[i];
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168 if (c >= 0xdc80 && c <= 0xdcff) {
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169 /* UTF-8b surrogate */
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170 if (bytes != NULL) {
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171 *bytes++ = c - 0xdc00;
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172 size--;
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173 }
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174 else
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175 size++;
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176 continue;
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177 }
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178 else {
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179 buf[0] = c;
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180 if (bytes != NULL)
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181 converted = wcstombs(bytes, buf, size);
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182 else
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183 converted = wcstombs(NULL, buf, 0);
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184 if (converted == (size_t)-1) {
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185 if (result != NULL)
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186 PyMem_Free(result);
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187 if (error_pos != NULL)
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188 *error_pos = i;
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189 return NULL;
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190 }
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191 if (bytes != NULL) {
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192 bytes += converted;
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193 size -= converted;
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194 }
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195 else
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196 size += converted;
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197 }
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198 }
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199 if (result != NULL) {
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200 *bytes = 0;
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201 break;
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202 }
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203
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204 size += 1; /* nul byte at the end */
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205 result = PyMem_Malloc(size);
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206 if (result == NULL)
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207 return NULL;
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208 bytes = result;
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209 }
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210 return result;
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211 }
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212
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213 /* In principle, this should use HAVE__WSTAT, and _wstat
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214 should be detected by autoconf. However, no current
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215 POSIX system provides that function, so testing for
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216 it is pointless.
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217 Not sure whether the MS_WINDOWS guards are necessary:
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218 perhaps for cygwin/mingw builds?
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219 */
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220 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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221
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222 /* Get file status. Encode the path to the locale encoding. */
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223
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224 int
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225 _Py_wstat(const wchar_t* path, struct stat *buf)
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226 {
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227 int err;
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228 char *fname;
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229 fname = _Py_wchar2char(path, NULL);
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230 if (fname == NULL) {
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231 errno = EINVAL;
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232 return -1;
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233 }
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234 err = stat(fname, buf);
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235 PyMem_Free(fname);
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236 return err;
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237 }
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238 #endif
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239
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240 /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
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241 call stat() otherwise. Only fill st_mode attribute on Windows.
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242
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243 Return 0 on success, -1 on _wstat() / stat() error, -2 if an exception was
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244 raised. */
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245
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246 int
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247 _Py_stat(PyObject *path, struct stat *statbuf)
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248 {
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249 #ifdef MS_WINDOWS
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250 int err;
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251 struct _stat wstatbuf;
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252 wchar_t *wpath;
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253
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254 wpath = PyUnicode_AsUnicode(path);
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255 if (wpath == NULL)
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256 return -2;
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257 err = _wstat(wpath, &wstatbuf);
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258 if (!err)
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259 statbuf->st_mode = wstatbuf.st_mode;
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260 return err;
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261 #else
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262 int ret;
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263 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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264 if (bytes == NULL)
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265 return -2;
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266 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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267 Py_DECREF(bytes);
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268 return ret;
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269 #endif
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270 }
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271
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272 /* Open a file. Use _wfopen() on Windows, encode the path to the locale
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273 encoding and use fopen() otherwise. */
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274
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275 FILE *
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276 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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277 {
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278 #ifndef MS_WINDOWS
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279 FILE *f;
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280 char *cpath;
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281 char cmode[10];
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282 size_t r;
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283 r = wcstombs(cmode, mode, 10);
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284 if (r == (size_t)-1 || r >= 10) {
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285 errno = EINVAL;
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286 return NULL;
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287 }
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288 cpath = _Py_wchar2char(path, NULL);
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289 if (cpath == NULL)
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290 return NULL;
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291 f = fopen(cpath, cmode);
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292 PyMem_Free(cpath);
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293 return f;
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294 #else
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295 return _wfopen(path, mode);
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296 #endif
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297 }
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298
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299 /* Call _wfopen() on Windows, or encode the path to the filesystem encoding and
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300 call fopen() otherwise.
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301
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302 Return the new file object on success, or NULL if the file cannot be open or
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303 (if PyErr_Occurred()) on unicode error */
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304
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305 FILE*
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2147cc152227 _Py_stat() and _Py_fopen(): avoid PyUnicode_AsWideCharString() on Windows
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306 _Py_fopen(PyObject *path, const char *mode)
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307 {
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308 #ifdef MS_WINDOWS
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309 wchar_t *wpath;
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310 wchar_t wmode[10];
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311 int usize;
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312
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313 if (!PyUnicode_Check(path)) {
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314 PyErr_Format(PyExc_TypeError,
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315 "str file path expected under Windows, got %R",
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316 Py_TYPE(path));
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317 return NULL;
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318 }
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319 wpath = PyUnicode_AsUnicode(path);
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320 if (wpath == NULL)
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321 return NULL;
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322
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323 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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324 if (usize == 0)
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325 return NULL;
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326
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327 return _wfopen(wpath, wmode);
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328 #else
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329 FILE *f;
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a882aa30a713 _Py_fopen now allows bytes filenames under non-Windows platforms.
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330 PyObject *bytes;
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331 if (!PyUnicode_FSConverter(path, &bytes))
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332 return NULL;
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333 f = fopen(PyBytes_AS_STRING(bytes), mode);
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334 Py_DECREF(bytes);
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335 return f;
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336 #endif
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337 }
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338
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339 #ifdef HAVE_READLINK
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340
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341 /* Read value of symbolic link. Encode the path to the locale encoding, decode
74002
279b0aee0cfb Add PyUnicode_DecodeLocaleAndSize() and PyUnicode_DecodeLocale()
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342 the result from the locale encoding. Return -1 on error. */
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343
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344 int
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345 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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346 {
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347 char *cpath;
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348 char cbuf[PATH_MAX];
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349 wchar_t *wbuf;
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350 int res;
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351 size_t r1;
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352
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353 cpath = _Py_wchar2char(path, NULL);
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354 if (cpath == NULL) {
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355 errno = EINVAL;
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356 return -1;
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357 }
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358 res = (int)readlink(cpath, cbuf, PATH_MAX);
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359 PyMem_Free(cpath);
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360 if (res == -1)
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361 return -1;
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362 if (res == PATH_MAX) {
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363 errno = EINVAL;
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364 return -1;
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365 }
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366 cbuf[res] = '\0'; /* buf will be null terminated */
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367 wbuf = _Py_char2wchar(cbuf, &r1);
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368 if (wbuf == NULL) {
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369 errno = EINVAL;
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370 return -1;
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371 }
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372 if (bufsiz <= r1) {
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373 PyMem_Free(wbuf);
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374 errno = EINVAL;
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375 return -1;
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376 }
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377 wcsncpy(buf, wbuf, bufsiz);
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378 PyMem_Free(wbuf);
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379 return (int)r1;
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380 }
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381 #endif
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382
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383 #ifdef HAVE_REALPATH
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384
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385 /* Return the canonicalized absolute pathname. Encode path to the locale
74002
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386 encoding, decode the result from the locale encoding.
279b0aee0cfb Add PyUnicode_DecodeLocaleAndSize() and PyUnicode_DecodeLocale()
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387 Return NULL on error. */
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388
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389 wchar_t*
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390 _Py_wrealpath(const wchar_t *path,
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391 wchar_t *resolved_path, size_t resolved_path_size)
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392 {
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393 char *cpath;
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394 char cresolved_path[PATH_MAX];
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395 wchar_t *wresolved_path;
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396 char *res;
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397 size_t r;
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398 cpath = _Py_wchar2char(path, NULL);
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399 if (cpath == NULL) {
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400 errno = EINVAL;
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diff changeset
401 return NULL;
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diff changeset
402 }
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403 res = realpath(cpath, cresolved_path);
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404 PyMem_Free(cpath);
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405 if (res == NULL)
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406 return NULL;
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diff changeset
407
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diff changeset
408 wresolved_path = _Py_char2wchar(cresolved_path, &r);
65411
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diff changeset
409 if (wresolved_path == NULL) {
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diff changeset
410 errno = EINVAL;
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411 return NULL;
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parents:
diff changeset
412 }
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diff changeset
413 if (resolved_path_size <= r) {
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diff changeset
414 PyMem_Free(wresolved_path);
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diff changeset
415 errno = EINVAL;
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diff changeset
416 return NULL;
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parents: 65410
diff changeset
417 }
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diff changeset
418 wcsncpy(resolved_path, wresolved_path, resolved_path_size);
df0e348e7176 _Py_wrealpath() uses _Py_char2wchar() to decode the result, to support
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diff changeset
419 PyMem_Free(wresolved_path);
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420 return resolved_path;
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421 }
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422 #endif
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423
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424 /* Get the current directory. size is the buffer size in wide characters
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425 including the null character. Decode the path from the locale encoding.
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426 Return NULL on error. */
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427
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428 wchar_t*
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429 _Py_wgetcwd(wchar_t *buf, size_t size)
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430 {
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431 #ifdef MS_WINDOWS
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432 return _wgetcwd(buf, size);
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433 #else
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434 char fname[PATH_MAX];
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435 wchar_t *wname;
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436 size_t len;
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437
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438 if (getcwd(fname, PATH_MAX) == NULL)
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439 return NULL;
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440 wname = _Py_char2wchar(fname, &len);
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441 if (wname == NULL)
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442 return NULL;
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443 if (size <= len) {
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444 PyMem_Free(wname);
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445 return NULL;
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446 }
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447 wcsncpy(buf, wname, size);
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448 PyMem_Free(wname);
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449 return buf;
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450 #endif
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451 }
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452
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453 #endif