Mercurial > cpython-lru_cache-weakref

annotate Python/fileutils.c @ 80704:af6fd3ca6de9 3.2

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Issue #16416: Fix compilation error
author Victor Stinner <victor.stinner@gmail.com>
date Mon, 03 Dec 2012 14:11:57 +0100
parents c838c9b117f1
children c256764e2b3f 2a67d79490ae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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39014f0abc32 Create fileutils.c/.h
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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 __APPLE__
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7 extern wchar_t* _Py_DecodeUTF8_surrogateescape(const char *s, Py_ssize_t size);
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8 #endif
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9
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10 #ifdef HAVE_STAT
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11
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12 /* Decode a byte string from the locale encoding with the
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13 surrogateescape error handler (undecodable bytes are decoded as characters
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14 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
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15 character, escape the bytes using the surrogateescape error handler instead
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16 of decoding them.
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17
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18 Use _Py_wchar2char() to encode the character string back to a byte string.
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19
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20 Return a pointer to a newly allocated wide character string (use
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21 PyMem_Free() to free the memory) and write the number of written wide
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22 characters excluding the null character into *size if size is not NULL, or
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23 NULL on error (conversion or memory allocation error).
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24
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25 Conversion errors should never happen, unless there is a bug in the C
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26 library. */
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27 wchar_t*
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28 _Py_char2wchar(const char* arg, size_t *size)
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29 {
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30 #ifdef __APPLE__
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31 wchar_t *wstr;
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32 wstr = _Py_DecodeUTF8_surrogateescape(arg, strlen(arg));
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33 if (size != NULL) {
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34 if (wstr != NULL)
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35 *size = wcslen(wstr);
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36 else
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37 *size = (size_t)-1;
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38 }
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39 return wstr;
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40 #else
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41 wchar_t *res;
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42 #ifdef HAVE_BROKEN_MBSTOWCS
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43 /* Some platforms have a broken implementation of
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44 * mbstowcs which does not count the characters that
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45 * would result from conversion. Use an upper bound.
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46 */
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47 size_t argsize = strlen(arg);
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48 #else
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49 size_t argsize = mbstowcs(NULL, arg, 0);
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50 #endif
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51 size_t count;
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52 unsigned char *in;
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53 wchar_t *out;
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54 #ifdef HAVE_MBRTOWC
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55 mbstate_t mbs;
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56 #endif
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57 if (argsize != (size_t)-1) {
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58 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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59 if (!res)
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60 goto oom;
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61 count = mbstowcs(res, arg, argsize+1);
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62 if (count != (size_t)-1) {
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63 wchar_t *tmp;
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64 /* Only use the result if it contains no
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65 surrogate characters. */
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66 for (tmp = res; *tmp != 0 &&
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67 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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68 ;
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69 if (*tmp == 0) {
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70 if (size != NULL)
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71 *size = count;
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72 return res;
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73 }
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74 }
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75 PyMem_Free(res);
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76 }
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77 /* Conversion failed. Fall back to escaping with surrogateescape. */
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78 #ifdef HAVE_MBRTOWC
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79 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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80
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81 /* Overallocate; as multi-byte characters are in the argument, the
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82 actual output could use less memory. */
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83 argsize = strlen(arg) + 1;
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84 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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85 if (!res)
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86 goto oom;
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87 in = (unsigned char*)arg;
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88 out = res;
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89 memset(&mbs, 0, sizeof mbs);
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90 while (argsize) {
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91 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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92 if (converted == 0)
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93 /* Reached end of string; null char stored. */
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94 break;
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95 if (converted == (size_t)-2) {
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96 /* Incomplete character. This should never happen,
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97 since we provide everything that we have -
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98 unless there is a bug in the C library, or I
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99 misunderstood how mbrtowc works. */
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100 fprintf(stderr, "unexpected mbrtowc result -2\n");
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101 PyMem_Free(res);
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102 return NULL;
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103 }
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104 if (converted == (size_t)-1) {
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105 /* Conversion error. Escape as UTF-8b, and start over
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106 in the initial shift state. */
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107 *out++ = 0xdc00 + *in++;
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108 argsize--;
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109 memset(&mbs, 0, sizeof mbs);
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110 continue;
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111 }
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112 if (*out >= 0xd800 && *out <= 0xdfff) {
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113 /* Surrogate character. Escape the original
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114 byte sequence with surrogateescape. */
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115 argsize -= converted;
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116 while (converted--)
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117 *out++ = 0xdc00 + *in++;
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118 continue;
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119 }
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120 /* successfully converted some bytes */
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121 in += converted;
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122 argsize -= converted;
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123 out++;
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124 }
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125 #else /* HAVE_MBRTOWC */
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126 /* Cannot use C locale for escaping; manually escape as if charset
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127 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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128 correctly in the locale's charset, which must be an ASCII superset. */
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129 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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130 if (!res) goto oom;
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131 in = (unsigned char*)arg;
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132 out = res;
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133 while(*in)
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134 if(*in < 128)
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135 *out++ = *in++;
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136 else
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137 *out++ = 0xdc00 + *in++;
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138 *out = 0;
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139 #endif /* HAVE_MBRTOWC */
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140 if (size != NULL)
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141 *size = out - res;
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142 return res;
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143 oom:
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144 fprintf(stderr, "out of memory\n");
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145 return NULL;
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146 #endif /* __APPLE__ */
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147 }
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148
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149 /* Encode a (wide) character string to the locale encoding with the
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150 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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151 converted to bytes 0x80..0xFF).
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152
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153 This function is the reverse of _Py_char2wchar().
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154
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155 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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156 the memory), or NULL on conversion or memory allocation error.
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157
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158 If error_pos is not NULL: *error_pos is the index of the invalid character
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159 on conversion error, or (size_t)-1 otherwise. */
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160 char*
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161 _Py_wchar2char(const wchar_t *text, size_t *error_pos)
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162 {
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163 #ifdef __APPLE__
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164 Py_ssize_t len;
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165 PyObject *unicode, *bytes = NULL;
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166 char *cpath;
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167
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168 unicode = PyUnicode_FromWideChar(text, wcslen(text));
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169 if (unicode == NULL)
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170 return NULL;
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171
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172 bytes = PyUnicode_EncodeUTF8(PyUnicode_AS_UNICODE(unicode),
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173 PyUnicode_GET_SIZE(unicode),
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174 "surrogateescape");
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175 Py_DECREF(unicode);
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176 if (bytes == NULL) {
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177 PyErr_Clear();
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178 if (error_pos != NULL)
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179 *error_pos = (size_t)-1;
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180 return NULL;
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181 }
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182
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183 len = PyBytes_GET_SIZE(bytes);
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184 cpath = PyMem_Malloc(len+1);
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185 if (cpath == NULL) {
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186 PyErr_Clear();
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187 Py_DECREF(bytes);
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188 if (error_pos != NULL)
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189 *error_pos = (size_t)-1;
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190 return NULL;
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191 }
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192 memcpy(cpath, PyBytes_AsString(bytes), len + 1);
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193 Py_DECREF(bytes);
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194 return cpath;
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195 #else /* __APPLE__ */
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196 const size_t len = wcslen(text);
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197 char *result = NULL, *bytes = NULL;
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198 size_t i, size, converted;
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199 wchar_t c, buf[2];
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200
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201 /* The function works in two steps:
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202 1. compute the length of the output buffer in bytes (size)
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203 2. outputs the bytes */
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204 size = 0;
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205 buf[1] = 0;
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206 while (1) {
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207 for (i=0; i < len; i++) {
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208 c = text[i];
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209 if (c >= 0xdc80 && c <= 0xdcff) {
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210 /* UTF-8b surrogate */
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211 if (bytes != NULL) {
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212 *bytes++ = c - 0xdc00;
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213 size--;
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214 }
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215 else
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216 size++;
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217 continue;
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218 }
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219 else {
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220 buf[0] = c;
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221 if (bytes != NULL)
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222 converted = wcstombs(bytes, buf, size);
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223 else
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224 converted = wcstombs(NULL, buf, 0);
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225 if (converted == (size_t)-1) {
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226 if (result != NULL)
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227 PyMem_Free(result);
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228 if (error_pos != NULL)
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229 *error_pos = i;
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230 return NULL;
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231 }
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232 if (bytes != NULL) {
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233 bytes += converted;
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234 size -= converted;
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235 }
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236 else
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237 size += converted;
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238 }
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239 }
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240 if (result != NULL) {
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241 *bytes = 0;
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242 break;
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243 }
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244
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245 size += 1; /* nul byte at the end */
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246 result = PyMem_Malloc(size);
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247 if (result == NULL) {
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248 if (error_pos != NULL)
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249 *error_pos = (size_t)-1;
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250 return NULL;
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251 }
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252 bytes = result;
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253 }
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254 return result;
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255 #endif /* __APPLE__ */
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256 }
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257
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258 /* In principle, this should use HAVE__WSTAT, and _wstat
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259 should be detected by autoconf. However, no current
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260 POSIX system provides that function, so testing for
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261 it is pointless.
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262 Not sure whether the MS_WINDOWS guards are necessary:
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263 perhaps for cygwin/mingw builds?
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264 */
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265 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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266
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267 /* Get file status. Encode the path to the locale encoding. */
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268
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269 int
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270 _Py_wstat(const wchar_t* path, struct stat *buf)
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271 {
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272 int err;
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273 char *fname;
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274 fname = _Py_wchar2char(path, NULL);
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275 if (fname == NULL) {
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276 errno = EINVAL;
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277 return -1;
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278 }
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279 err = stat(fname, buf);
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280 PyMem_Free(fname);
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281 return err;
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282 }
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283 #endif
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284
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285 /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
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286 call stat() otherwise. Only fill st_mode attribute on Windows.
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287
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288 Return 0 on success, -1 on _wstat() / stat() error or (if PyErr_Occurred())
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289 unicode error. */
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290
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291 int
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292 _Py_stat(PyObject *path, struct stat *statbuf)
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293 {
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294 #ifdef MS_WINDOWS
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295 int err;
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296 struct _stat wstatbuf;
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297
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298 err = _wstat(PyUnicode_AS_UNICODE(path), &wstatbuf);
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299 if (!err)
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300 statbuf->st_mode = wstatbuf.st_mode;
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301 return err;
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302 #else
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303 int ret;
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304 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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305 if (bytes == NULL)
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306 return -1;
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307 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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308 Py_DECREF(bytes);
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309 return ret;
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310 #endif
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311 }
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312
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313 /* Open a file. Use _wfopen() on Windows, encode the path to the locale
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314 encoding and use fopen() otherwise. */
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315
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316 FILE *
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317 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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318 {
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319 #ifndef MS_WINDOWS
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320 FILE *f;
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321 char *cpath;
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322 char cmode[10];
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323 size_t r;
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324 r = wcstombs(cmode, mode, 10);
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325 if (r == (size_t)-1 || r >= 10) {
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326 errno = EINVAL;
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327 return NULL;
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328 }
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329 cpath = _Py_wchar2char(path, NULL);
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330 if (cpath == NULL)
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331 return NULL;
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332 f = fopen(cpath, cmode);
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333 PyMem_Free(cpath);
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334 return f;
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335 #else
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336 return _wfopen(path, mode);
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337 #endif
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338 }
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339
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340 /* Call _wfopen() on Windows, or encode the path to the filesystem encoding and
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341 call fopen() otherwise.
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342
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343 Return the new file object on success, or NULL if the file cannot be open or
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344 (if PyErr_Occurred()) on unicode error */
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345
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346 FILE*
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347 _Py_fopen(PyObject *path, const char *mode)
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348 {
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349 #ifdef MS_WINDOWS
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350 wchar_t wmode[10];
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351 int usize;
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352
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353 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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354 if (usize == 0)
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355 return NULL;
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356
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357 return _wfopen(PyUnicode_AS_UNICODE(path), wmode);
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358 #else
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359 FILE *f;
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360 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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361 if (bytes == NULL)
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362 return NULL;
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363 f = fopen(PyBytes_AS_STRING(bytes), mode);
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364 Py_DECREF(bytes);
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365 return f;
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366 #endif
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367 }
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368
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369 #ifdef HAVE_READLINK
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370
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371 /* Read value of symbolic link. Encode the path to the locale encoding, decode
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372 the result from the locale encoding. */
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373
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374 int
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375 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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376 {
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377 char *cpath;
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378 char cbuf[PATH_MAX];
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379 wchar_t *wbuf;
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380 int res;
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381 size_t r1;
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382
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383 cpath = _Py_wchar2char(path, NULL);
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384 if (cpath == NULL) {
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385 errno = EINVAL;
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386 return -1;
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387 }
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388 res = (int)readlink(cpath, cbuf, PATH_MAX);
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389 PyMem_Free(cpath);
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390 if (res == -1)
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391 return -1;
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392 if (res == PATH_MAX) {
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393 errno = EINVAL;
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394 return -1;
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395 }
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396 cbuf[res] = '\0'; /* buf will be null terminated */
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397 wbuf = _Py_char2wchar(cbuf, &r1);
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398 if (wbuf == NULL) {
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399 errno = EINVAL;
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400 return -1;
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401 }
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402 if (bufsiz <= r1) {
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403 PyMem_Free(wbuf);
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404 errno = EINVAL;
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405 return -1;
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406 }
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407 wcsncpy(buf, wbuf, bufsiz);
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408 PyMem_Free(wbuf);
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409 return (int)r1;
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410 }
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411 #endif
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412
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413 #ifdef HAVE_REALPATH
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414
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415 /* Return the canonicalized absolute pathname. Encode path to the locale
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416 encoding, decode the result from the locale encoding. */
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417
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418 wchar_t*
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diff changeset
419 _Py_wrealpath(const wchar_t *path,
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420 wchar_t *resolved_path, size_t resolved_path_size)
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421 {
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422 char *cpath;
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423 char cresolved_path[PATH_MAX];
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424 wchar_t *wresolved_path;
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425 char *res;
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426 size_t r;
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427 cpath = _Py_wchar2char(path, NULL);
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428 if (cpath == NULL) {
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429 errno = EINVAL;
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430 return NULL;
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431 }
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432 res = realpath(cpath, cresolved_path);
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433 PyMem_Free(cpath);
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434 if (res == NULL)
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435 return NULL;
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436
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437 wresolved_path = _Py_char2wchar(cresolved_path, &r);
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438 if (wresolved_path == NULL) {
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439 errno = EINVAL;
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440 return NULL;
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441 }
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442 if (resolved_path_size <= r) {
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parents: 65410
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443 PyMem_Free(wresolved_path);
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444 errno = EINVAL;
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445 return NULL;
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446 }
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447 wcsncpy(resolved_path, wresolved_path, resolved_path_size);
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448 PyMem_Free(wresolved_path);
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449 return resolved_path;
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450 }
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451 #endif
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452
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453 /* Get the current directory. size is the buffer size in wide characters
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parents: 65168
diff changeset
454 including the null character. Decode the path from the locale encoding. */
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1c4774b4e98a fileutils.c: document which encodings are used
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parents: 65166
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455
65162
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456 wchar_t*
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457 _Py_wgetcwd(wchar_t *buf, size_t size)
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458 {
39014f0abc32 Create fileutils.c/.h
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459 #ifdef MS_WINDOWS
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460 return _wgetcwd(buf, size);
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461 #else
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462 char fname[PATH_MAX];
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parents: 65168
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463 wchar_t *wname;
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464 size_t len;
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diff changeset
465
65162
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466 if (getcwd(fname, PATH_MAX) == NULL)
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467 return NULL;
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parents: 65411
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468 wname = _Py_char2wchar(fname, &len);
65312
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parents: 65168
diff changeset
469 if (wname == NULL)
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parents: 65168
diff changeset
470 return NULL;
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parents: 65411
diff changeset
471 if (size <= len) {
65312
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parents: 65168
diff changeset
472 PyMem_Free(wname);
65162
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473 return NULL;
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parents:
diff changeset
474 }
65312
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Victor Stinner <victor.stinner@haypocalc.com>
parents: 65168
diff changeset
475 wcsncpy(buf, wname, size);
a27fc0ff3678 _Py_wgetcwd() decodes the path using _Py_char2wchar() to support surrogates
Victor Stinner <victor.stinner@haypocalc.com>
parents: 65168
diff changeset
476 PyMem_Free(wname);
65162
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parents:
diff changeset
477 return buf;
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parents:
diff changeset
478 #endif
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parents:
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479 }
39014f0abc32 Create fileutils.c/.h
Victor Stinner <victor.stinner@haypocalc.com>
parents:
diff changeset
480
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481 #endif