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annotate Python/fileutils.c @ 65163:7879a8ec7f79

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Ooops, fileutils.c contains twice the same code I suppose that I reapplied my local patch creating Python/fileutils.c whereas the file already existed.
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 07 Oct 2010 21:55:44 +0000
parents 39014f0abc32
children 1f3919af8a53
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
65162
39014f0abc32 Create fileutils.c/.h
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1 #include "Python.h"
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2
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3 #ifdef HAVE_STAT
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4
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5 /* Decode a byte string from the locale encoding with the
39014f0abc32 Create fileutils.c/.h
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6 surrogateescape error handler (undecodable bytes are decoded as characters
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7 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
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8 character, escape the bytes using the surrogateescape error handler instead
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9 of decoding them.
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10
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11 Use _Py_wchar2char() to encode the character string back to a byte string.
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12
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13 Return a pointer to a newly allocated (wide) character string (use
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14 PyMem_Free() to free the memory), or NULL on error (conversion error or
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15 memory error). */
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16 wchar_t*
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17 _Py_char2wchar(char* arg)
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18 {
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19 wchar_t *res;
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20 #ifdef HAVE_BROKEN_MBSTOWCS
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21 /* Some platforms have a broken implementation of
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22 * mbstowcs which does not count the characters that
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23 * would result from conversion. Use an upper bound.
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24 */
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25 size_t argsize = strlen(arg);
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26 #else
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27 size_t argsize = mbstowcs(NULL, arg, 0);
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28 #endif
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29 size_t count;
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30 unsigned char *in;
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31 wchar_t *out;
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32 #ifdef HAVE_MBRTOWC
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33 mbstate_t mbs;
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34 #endif
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35 if (argsize != (size_t)-1) {
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36 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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37 if (!res)
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38 goto oom;
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39 count = mbstowcs(res, arg, argsize+1);
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40 if (count != (size_t)-1) {
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41 wchar_t *tmp;
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42 /* Only use the result if it contains no
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43 surrogate characters. */
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44 for (tmp = res; *tmp != 0 &&
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45 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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46 ;
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47 if (*tmp == 0)
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48 return res;
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49 }
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50 PyMem_Free(res);
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51 }
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52 /* Conversion failed. Fall back to escaping with surrogateescape. */
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53 #ifdef HAVE_MBRTOWC
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54 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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55
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56 /* Overallocate; as multi-byte characters are in the argument, the
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57 actual output could use less memory. */
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58 argsize = strlen(arg) + 1;
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59 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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60 if (!res) goto oom;
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61 in = (unsigned char*)arg;
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62 out = res;
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63 memset(&mbs, 0, sizeof mbs);
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64 while (argsize) {
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65 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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66 if (converted == 0)
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67 /* Reached end of string; null char stored. */
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68 break;
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69 if (converted == (size_t)-2) {
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70 /* Incomplete character. This should never happen,
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71 since we provide everything that we have -
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72 unless there is a bug in the C library, or I
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73 misunderstood how mbrtowc works. */
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74 fprintf(stderr, "unexpected mbrtowc result -2\n");
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75 return NULL;
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76 }
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77 if (converted == (size_t)-1) {
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78 /* Conversion error. Escape as UTF-8b, and start over
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79 in the initial shift state. */
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80 *out++ = 0xdc00 + *in++;
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81 argsize--;
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82 memset(&mbs, 0, sizeof mbs);
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83 continue;
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84 }
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85 if (*out >= 0xd800 && *out <= 0xdfff) {
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86 /* Surrogate character. Escape the original
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87 byte sequence with surrogateescape. */
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88 argsize -= converted;
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89 while (converted--)
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90 *out++ = 0xdc00 + *in++;
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91 continue;
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92 }
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93 /* successfully converted some bytes */
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94 in += converted;
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95 argsize -= converted;
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96 out++;
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97 }
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98 #else
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99 /* Cannot use C locale for escaping; manually escape as if charset
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100 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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101 correctly in the locale's charset, which must be an ASCII superset. */
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102 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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103 if (!res) goto oom;
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104 in = (unsigned char*)arg;
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105 out = res;
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106 while(*in)
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107 if(*in < 128)
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108 *out++ = *in++;
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109 else
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110 *out++ = 0xdc00 + *in++;
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111 *out = 0;
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112 #endif
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113 return res;
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114 oom:
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115 fprintf(stderr, "out of memory\n");
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116 return NULL;
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117 }
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118
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119 /* Encode a (wide) character string to the locale encoding with the
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120 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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121 converted to bytes 0x80..0xFF).
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122
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123 This function is the reverse of _Py_char2wchar().
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124
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125 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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126 the memory), or NULL on error (conversion error or memory error). */
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127 char*
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128 _Py_wchar2char(const wchar_t *text)
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129 {
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130 const size_t len = wcslen(text);
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131 char *result = NULL, *bytes = NULL;
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132 size_t i, size, converted;
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133 wchar_t c, buf[2];
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134
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135 /* The function works in two steps:
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136 1. compute the length of the output buffer in bytes (size)
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137 2. outputs the bytes */
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138 size = 0;
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139 buf[1] = 0;
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140 while (1) {
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141 for (i=0; i < len; i++) {
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142 c = text[i];
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143 if (c >= 0xdc80 && c <= 0xdcff) {
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144 /* UTF-8b surrogate */
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145 if (bytes != NULL) {
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146 *bytes++ = c - 0xdc00;
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147 size--;
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148 }
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parents:
diff changeset
149 else
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diff changeset
150 size++;
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parents:
diff changeset
151 continue;
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parents:
diff changeset
152 }
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153 else {
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154 buf[0] = c;
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155 if (bytes != NULL)
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156 converted = wcstombs(bytes, buf, size);
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157 else
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158 converted = wcstombs(NULL, buf, 0);
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159 if (converted == (size_t)-1) {
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160 if (result != NULL)
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161 PyMem_Free(result);
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diff changeset
162 return NULL;
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parents:
diff changeset
163 }
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
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164 if (bytes != NULL) {
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165 bytes += converted;
39014f0abc32 Create fileutils.c/.h
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166 size -= converted;
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parents:
diff changeset
167 }
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168 else
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169 size += converted;
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diff changeset
170 }
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parents:
diff changeset
171 }
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
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172 if (result != NULL) {
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173 *bytes = 0;
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diff changeset
174 break;
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parents:
diff changeset
175 }
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176
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177 size += 1; /* nul byte at the end */
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178 result = PyMem_Malloc(size);
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179 if (result == NULL)
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180 return NULL;
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181 bytes = result;
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diff changeset
182 }
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183 return result;
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parents:
diff changeset
184 }
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185
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186 #if defined(MS_WINDOWS) || defined(HAVE_STAT)
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187 int
39014f0abc32 Create fileutils.c/.h
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188 _Py_wstat(const wchar_t* path, struct stat *buf)
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189 {
39014f0abc32 Create fileutils.c/.h
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190 /* In principle, this should use HAVE__WSTAT, and _wstat
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
191 should be detected by autoconf. However, no current
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192 POSIX system provides that function, so testing for
39014f0abc32 Create fileutils.c/.h
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193 it is pointless.
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194 Not sure whether the MS_WINDOWS guards are necessary:
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195 perhaps for cygwin/mingw builds?
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196 */
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197 #ifdef MS_WINDOWS
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198 return _wstat(path, buf);
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diff changeset
199 #else
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diff changeset
200 int err;
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
201 char *fname;
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parents:
diff changeset
202 fname = _Py_wchar2char(path);
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parents:
diff changeset
203 if (fname == NULL) {
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204 errno = EINVAL;
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parents:
diff changeset
205 return -1;
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parents:
diff changeset
206 }
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
207 err = stat(fname, buf);
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
208 PyMem_Free(fname);
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parents:
diff changeset
209 return err;
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parents:
diff changeset
210 #endif
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parents:
diff changeset
211 }
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parents:
diff changeset
212 #endif
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diff changeset
213
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Victor Stinner <victor.stinner@haypocalc.com>
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diff changeset
214 /* Call _wstat() on Windows, or stat() otherwise. Only fill st_mode
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diff changeset
215 attribute on Windows. Return 0 on success, -1 on stat error or (if
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
216 PyErr_Occurred()) unicode error. */
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diff changeset
217
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parents:
diff changeset
218 int
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
219 _Py_stat(PyObject *unicode, struct stat *statbuf)
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
220 {
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parents:
diff changeset
221 #ifdef MS_WINDOWS
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
222 wchar_t *path;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
223 int err;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
224 struct _stat wstatbuf;
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
225
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diff changeset
226 path = PyUnicode_AsWideCharString(unicode, NULL);
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
227 if (path == NULL)
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parents:
diff changeset
228 return -1;
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
229 err = _wstat(path, &wstatbuf);
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parents:
diff changeset
230 PyMem_Free(path);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
231 if (!err)
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
232 statbuf->st_mode = wstatbuf.st_mode;
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parents:
diff changeset
233 return err;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
234 #else
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
235 int ret;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
236 PyObject *bytes = PyUnicode_EncodeFSDefault(unicode);
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
237 if (bytes == NULL)
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parents:
diff changeset
238 return -1;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
239 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
240 Py_DECREF(bytes);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
241 return ret;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
242 #endif
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
243 }
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diff changeset
244
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diff changeset
245 FILE *
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
246 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
247 {
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
248 #ifndef MS_WINDOWS
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diff changeset
249 FILE *f;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
250 char *cpath;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
251 char cmode[10];
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
252 size_t r;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
253 r = wcstombs(cmode, mode, 10);
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parents:
diff changeset
254 if (r == (size_t)-1 || r >= 10) {
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parents:
diff changeset
255 errno = EINVAL;
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parents:
diff changeset
256 return NULL;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
257 }
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
258 cpath = _Py_wchar2char(path);
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parents:
diff changeset
259 if (cpath == NULL)
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
260 return NULL;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
261 f = fopen(cpath, cmode);
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parents:
diff changeset
262 PyMem_Free(cpath);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
263 return f;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
264 #else
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
265 return _wfopen(path, mode);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
266 #endif
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
267 }
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parents:
diff changeset
268
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
269 /* Call _wfopen() on Windows, or fopen() otherwise. Return the new file
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
270 object on success, or NULL if the file cannot be open or (if
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
271 PyErr_Occurred()) on unicode error */
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parents:
diff changeset
272
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diff changeset
273 FILE*
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
274 _Py_fopen(PyObject *unicode, const char *mode)
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
275 {
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parents:
diff changeset
276 #ifdef MS_WINDOWS
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parents:
diff changeset
277 wchar_t *path;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
278 wchar_t wmode[10];
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parents:
diff changeset
279 int usize;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
280 FILE *f;
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parents:
diff changeset
281
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diff changeset
282 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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parents:
diff changeset
283 if (usize == 0)
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parents:
diff changeset
284 return NULL;
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parents:
diff changeset
285
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
286 path = PyUnicode_AsWideCharString(unicode, NULL);
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parents:
diff changeset
287 if (path == NULL)
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parents:
diff changeset
288 return NULL;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
289 f = _wfopen(path, wmode);
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parents:
diff changeset
290 PyMem_Free(path);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
291 return f;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
292 #else
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
293 FILE *f;
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
294 PyObject *bytes = PyUnicode_EncodeFSDefault(unicode);
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parents:
diff changeset
295 if (bytes == NULL)
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parents:
diff changeset
296 return NULL;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
297 f = fopen(PyBytes_AS_STRING(bytes), mode);
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parents:
diff changeset
298 Py_DECREF(bytes);
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
299 return f;
39014f0abc32 Create fileutils.c/.h
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parents:
diff changeset
300 #endif
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
301 }
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parents:
diff changeset
302
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
303 #ifdef HAVE_READLINK
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Victor Stinner <victor.stinner@haypocalc.com>
parents:
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304 int
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305 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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306 {
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307 char *cpath;
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308 char cbuf[PATH_MAX];
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309 int res;
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310 size_t r1;
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311
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312 cpath = _Py_wchar2char(path);
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313 if (cpath == NULL) {
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314 errno = EINVAL;
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315 return -1;
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316 }
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317 res = (int)readlink(cpath, cbuf, PATH_MAX);
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318 PyMem_Free(cpath);
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319 if (res == -1)
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320 return -1;
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321 if (res == PATH_MAX) {
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322 errno = EINVAL;
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323 return -1;
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324 }
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325 cbuf[res] = '\0'; /* buf will be null terminated */
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326 r1 = mbstowcs(buf, cbuf, bufsiz);
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327 if (r1 == -1) {
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328 errno = EINVAL;
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329 return -1;
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330 }
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331 return (int)r1;
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332 }
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333 #endif
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334
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335 #ifdef HAVE_REALPATH
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336 wchar_t*
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337 _Py_wrealpath(const wchar_t *path, wchar_t *resolved_path)
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338 {
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339 char *cpath;
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340 char cresolved_path[PATH_MAX];
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341 char *res;
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342 size_t r;
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343 cpath = _Py_wchar2char(path);
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344 if (cpath == NULL) {
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345 errno = EINVAL;
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346 return NULL;
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347 }
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348 res = realpath(cpath, cresolved_path);
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349 PyMem_Free(cpath);
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350 if (res == NULL)
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351 return NULL;
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352 r = mbstowcs(resolved_path, cresolved_path, PATH_MAX);
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353 if (r == (size_t)-1 || r >= PATH_MAX) {
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354 errno = EINVAL;
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355 return NULL;
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356 }
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357 return resolved_path;
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358 }
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359 #endif
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360
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361 wchar_t*
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362 _Py_wgetcwd(wchar_t *buf, size_t size)
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363 {
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364 #ifdef MS_WINDOWS
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365 return _wgetcwd(buf, size);
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366 #else
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367 char fname[PATH_MAX];
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368 if (getcwd(fname, PATH_MAX) == NULL)
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369 return NULL;
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370 if (mbstowcs(buf, fname, size) >= size) {
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371 errno = ERANGE;
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372 return NULL;
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373 }
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374 return buf;
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375 #endif
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376 }
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377
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378 #endif