Mercurial > cpython-lru_cache-weakref

annotate Python/fileutils.c @ 69888:8752a81ada2d

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faulthandler: dump all threads by default * Set the default value of all_threads arguments to True * Py_FatalError() dumps all threads, instead of only the current thread Dump only the current thread is not reliable. In some cases, Python is unable to retrieve the state of the current thread and so is unable to dump the traceback. faulthandler keeps a reference to the interpreter and so is always able to dump the traceback of all threads.
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 07 May 2011 12:43:00 +0200
parents 76a1c5e88352
children c838c9b117f1 94a38ad4aebf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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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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412 char fname[PATH_MAX];
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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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421 if (size <= len) {
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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 }
39014f0abc32 Create fileutils.c/.h
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430
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431 #endif