Mercurial > cpython-lru_cache-weakref

annotate Python/fileutils.c @ 80589:ffb2fa900cb7 3.3

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Issue #16546: make ast.YieldFrom argument mandatory.
author Mark Dickinson <mdickinson@enthought.com>
date Sun, 25 Nov 2012 14:36:26 +0000
parents 5db6d9ddf6e8
children 26c4748351cb 3857a63cf840
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 #include "osdefs.h"
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3 #ifdef MS_WINDOWS
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4 # include <windows.h>
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5 #endif
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6
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7 #ifdef HAVE_LANGINFO_H
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8 #include <langinfo.h>
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9 #endif
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10
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11 PyObject *
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12 _Py_device_encoding(int fd)
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13 {
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14 #if defined(MS_WINDOWS) || defined(MS_WIN64)
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15 UINT cp;
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16 #endif
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17 if (!_PyVerify_fd(fd) || !isatty(fd)) {
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18 Py_RETURN_NONE;
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19 }
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20 #if defined(MS_WINDOWS) || defined(MS_WIN64)
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21 if (fd == 0)
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22 cp = GetConsoleCP();
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23 else if (fd == 1 || fd == 2)
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24 cp = GetConsoleOutputCP();
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25 else
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26 cp = 0;
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27 /* GetConsoleCP() and GetConsoleOutputCP() return 0 if the application
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28 has no console */
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29 if (cp != 0)
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30 return PyUnicode_FromFormat("cp%u", (unsigned int)cp);
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31 #elif defined(CODESET)
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32 {
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33 char *codeset = nl_langinfo(CODESET);
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34 if (codeset != NULL && codeset[0] != 0)
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35 return PyUnicode_FromString(codeset);
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36 }
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37 #endif
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38 Py_RETURN_NONE;
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39 }
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40
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41 #ifdef HAVE_STAT
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42
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43 /* Decode a byte string from the locale encoding with the
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44 surrogateescape error handler (undecodable bytes are decoded as characters
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45 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
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46 character, escape the bytes using the surrogateescape error handler instead
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47 of decoding them.
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48
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49 Use _Py_wchar2char() to encode the character string back to a byte string.
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50
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51 Return a pointer to a newly allocated wide character string (use
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52 PyMem_Free() to free the memory) and write the number of written wide
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53 characters excluding the null character into *size if size is not NULL, or
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54 NULL on error (decoding or memory allocation error). If size is not NULL,
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55 *size is set to (size_t)-1 on memory error and (size_t)-2 on decoding
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56 error.
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57
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58 Conversion errors should never happen, unless there is a bug in the C
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59 library. */
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60 wchar_t*
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61 _Py_char2wchar(const char* arg, size_t *size)
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62 {
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63 wchar_t *res;
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64 #ifdef HAVE_BROKEN_MBSTOWCS
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65 /* Some platforms have a broken implementation of
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66 * mbstowcs which does not count the characters that
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67 * would result from conversion. Use an upper bound.
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68 */
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69 size_t argsize = strlen(arg);
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70 #else
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71 size_t argsize = mbstowcs(NULL, arg, 0);
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72 #endif
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73 size_t count;
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74 unsigned char *in;
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75 wchar_t *out;
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76 #ifdef HAVE_MBRTOWC
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77 mbstate_t mbs;
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78 #endif
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79 if (argsize != (size_t)-1) {
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80 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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81 if (!res)
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82 goto oom;
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83 count = mbstowcs(res, arg, argsize+1);
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84 if (count != (size_t)-1) {
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85 wchar_t *tmp;
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86 /* Only use the result if it contains no
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87 surrogate characters. */
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88 for (tmp = res; *tmp != 0 &&
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89 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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90 ;
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91 if (*tmp == 0) {
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92 if (size != NULL)
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93 *size = count;
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94 return res;
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95 }
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96 }
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97 PyMem_Free(res);
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98 }
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99 /* Conversion failed. Fall back to escaping with surrogateescape. */
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100 #ifdef HAVE_MBRTOWC
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101 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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102
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103 /* Overallocate; as multi-byte characters are in the argument, the
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104 actual output could use less memory. */
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105 argsize = strlen(arg) + 1;
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106 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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107 if (!res)
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108 goto oom;
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109 in = (unsigned char*)arg;
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110 out = res;
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111 memset(&mbs, 0, sizeof mbs);
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112 while (argsize) {
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113 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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114 if (converted == 0)
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115 /* Reached end of string; null char stored. */
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116 break;
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117 if (converted == (size_t)-2) {
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118 /* Incomplete character. This should never happen,
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119 since we provide everything that we have -
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120 unless there is a bug in the C library, or I
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121 misunderstood how mbrtowc works. */
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122 PyMem_Free(res);
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123 if (size != NULL)
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124 *size = (size_t)-2;
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125 return NULL;
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126 }
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127 if (converted == (size_t)-1) {
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128 /* Conversion error. Escape as UTF-8b, and start over
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129 in the initial shift state. */
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130 *out++ = 0xdc00 + *in++;
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131 argsize--;
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132 memset(&mbs, 0, sizeof mbs);
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133 continue;
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134 }
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135 if (*out >= 0xd800 && *out <= 0xdfff) {
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136 /* Surrogate character. Escape the original
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137 byte sequence with surrogateescape. */
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138 argsize -= converted;
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139 while (converted--)
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140 *out++ = 0xdc00 + *in++;
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141 continue;
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142 }
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143 /* successfully converted some bytes */
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144 in += converted;
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145 argsize -= converted;
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146 out++;
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147 }
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148 #else
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149 /* Cannot use C locale for escaping; manually escape as if charset
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150 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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151 correctly in the locale's charset, which must be an ASCII superset. */
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152 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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153 if (!res)
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154 goto oom;
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155 in = (unsigned char*)arg;
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156 out = res;
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157 while(*in)
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158 if(*in < 128)
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159 *out++ = *in++;
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160 else
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161 *out++ = 0xdc00 + *in++;
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162 *out = 0;
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163 #endif
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164 if (size != NULL)
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165 *size = out - res;
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166 return res;
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167 oom:
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168 if (size != NULL)
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169 *size = (size_t)-1;
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170 return NULL;
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171 }
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172
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173 /* Encode a (wide) character string to the locale encoding with the
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174 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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175 converted to bytes 0x80..0xFF).
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176
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177 This function is the reverse of _Py_char2wchar().
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178
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179 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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180 the memory), or NULL on encoding or memory allocation error.
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181
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182 If error_pos is not NULL: *error_pos is the index of the invalid character
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183 on encoding error, or (size_t)-1 otherwise. */
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184 char*
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185 _Py_wchar2char(const wchar_t *text, size_t *error_pos)
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186 {
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187 const size_t len = wcslen(text);
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188 char *result = NULL, *bytes = NULL;
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189 size_t i, size, converted;
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190 wchar_t c, buf[2];
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191
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192 if (error_pos != NULL)
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193 *error_pos = (size_t)-1;
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194
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195 /* The function works in two steps:
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196 1. compute the length of the output buffer in bytes (size)
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197 2. outputs the bytes */
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198 size = 0;
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199 buf[1] = 0;
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200 while (1) {
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201 for (i=0; i < len; i++) {
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202 c = text[i];
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203 if (c >= 0xdc80 && c <= 0xdcff) {
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204 /* UTF-8b surrogate */
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205 if (bytes != NULL) {
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206 *bytes++ = c - 0xdc00;
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207 size--;
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208 }
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209 else
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210 size++;
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211 continue;
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212 }
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213 else {
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214 buf[0] = c;
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215 if (bytes != NULL)
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216 converted = wcstombs(bytes, buf, size);
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217 else
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218 converted = wcstombs(NULL, buf, 0);
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219 if (converted == (size_t)-1) {
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220 if (result != NULL)
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221 PyMem_Free(result);
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222 if (error_pos != NULL)
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223 *error_pos = i;
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224 return NULL;
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225 }
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226 if (bytes != NULL) {
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227 bytes += converted;
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228 size -= converted;
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229 }
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230 else
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231 size += converted;
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232 }
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233 }
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234 if (result != NULL) {
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235 *bytes = 0;
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236 break;
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237 }
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238
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239 size += 1; /* nul byte at the end */
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240 result = PyMem_Malloc(size);
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241 if (result == NULL)
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242 return NULL;
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243 bytes = result;
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244 }
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245 return result;
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246 }
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247
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248 /* In principle, this should use HAVE__WSTAT, and _wstat
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249 should be detected by autoconf. However, no current
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250 POSIX system provides that function, so testing for
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251 it is pointless.
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252 Not sure whether the MS_WINDOWS guards are necessary:
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253 perhaps for cygwin/mingw builds?
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254 */
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255 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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256
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257 /* Get file status. Encode the path to the locale encoding. */
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258
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259 int
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260 _Py_wstat(const wchar_t* path, struct stat *buf)
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261 {
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262 int err;
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263 char *fname;
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264 fname = _Py_wchar2char(path, NULL);
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265 if (fname == NULL) {
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266 errno = EINVAL;
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267 return -1;
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268 }
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269 err = stat(fname, buf);
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270 PyMem_Free(fname);
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271 return err;
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272 }
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273 #endif
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274
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275 /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
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276 call stat() otherwise. Only fill st_mode attribute on Windows.
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277
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278 Return 0 on success, -1 on _wstat() / stat() error, -2 if an exception was
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279 raised. */
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280
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281 int
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282 _Py_stat(PyObject *path, struct stat *statbuf)
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283 {
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284 #ifdef MS_WINDOWS
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285 int err;
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286 struct _stat wstatbuf;
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287 wchar_t *wpath;
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288
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289 wpath = PyUnicode_AsUnicode(path);
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290 if (wpath == NULL)
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291 return -2;
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292 err = _wstat(wpath, &wstatbuf);
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293 if (!err)
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294 statbuf->st_mode = wstatbuf.st_mode;
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295 return err;
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296 #else
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297 int ret;
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298 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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299 if (bytes == NULL)
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300 return -2;
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301 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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302 Py_DECREF(bytes);
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303 return ret;
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304 #endif
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305 }
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306
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307 /* Open a file. Use _wfopen() on Windows, encode the path to the locale
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308 encoding and use fopen() otherwise. */
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309
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310 FILE *
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311 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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312 {
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313 #ifndef MS_WINDOWS
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314 FILE *f;
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315 char *cpath;
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316 char cmode[10];
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317 size_t r;
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318 r = wcstombs(cmode, mode, 10);
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319 if (r == (size_t)-1 || r >= 10) {
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320 errno = EINVAL;
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321 return NULL;
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322 }
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323 cpath = _Py_wchar2char(path, NULL);
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324 if (cpath == NULL)
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325 return NULL;
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326 f = fopen(cpath, cmode);
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327 PyMem_Free(cpath);
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328 return f;
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329 #else
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330 return _wfopen(path, mode);
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331 #endif
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332 }
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333
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334 /* Call _wfopen() on Windows, or encode the path to the filesystem encoding and
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335 call fopen() otherwise.
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336
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337 Return the new file object on success, or NULL if the file cannot be open or
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338 (if PyErr_Occurred()) on unicode error */
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339
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340 FILE*
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341 _Py_fopen(PyObject *path, const char *mode)
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342 {
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343 #ifdef MS_WINDOWS
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344 wchar_t *wpath;
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345 wchar_t wmode[10];
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346 int usize;
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347
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348 if (!PyUnicode_Check(path)) {
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349 PyErr_Format(PyExc_TypeError,
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350 "str file path expected under Windows, got %R",
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351 Py_TYPE(path));
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352 return NULL;
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353 }
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354 wpath = PyUnicode_AsUnicode(path);
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355 if (wpath == NULL)
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356 return NULL;
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357
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358 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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359 if (usize == 0)
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360 return NULL;
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361
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362 return _wfopen(wpath, wmode);
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363 #else
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364 FILE *f;
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365 PyObject *bytes;
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366 if (!PyUnicode_FSConverter(path, &bytes))
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367 return NULL;
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368 f = fopen(PyBytes_AS_STRING(bytes), mode);
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369 Py_DECREF(bytes);
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370 return f;
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371 #endif
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372 }
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373
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374 #ifdef HAVE_READLINK
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375
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376 /* Read value of symbolic link. Encode the path to the locale encoding, decode
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377 the result from the locale encoding. Return -1 on error. */
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378
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379 int
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380 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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381 {
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382 char *cpath;
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383 char cbuf[PATH_MAX];
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384 wchar_t *wbuf;
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385 int res;
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386 size_t r1;
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387
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388 cpath = _Py_wchar2char(path, NULL);
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389 if (cpath == NULL) {
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390 errno = EINVAL;
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391 return -1;
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392 }
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393 res = (int)readlink(cpath, cbuf, PATH_MAX);
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394 PyMem_Free(cpath);
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395 if (res == -1)
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396 return -1;
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397 if (res == PATH_MAX) {
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398 errno = EINVAL;
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399 return -1;
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400 }
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401 cbuf[res] = '\0'; /* buf will be null terminated */
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402 wbuf = _Py_char2wchar(cbuf, &r1);
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403 if (wbuf == NULL) {
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diff changeset
404 errno = EINVAL;
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diff changeset
405 return -1;
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diff changeset
406 }
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diff changeset
407 if (bufsiz <= r1) {
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diff changeset
408 PyMem_Free(wbuf);
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409 errno = EINVAL;
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410 return -1;
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411 }
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412 wcsncpy(buf, wbuf, bufsiz);
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413 PyMem_Free(wbuf);
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414 return (int)r1;
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diff changeset
415 }
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diff changeset
416 #endif
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417
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418 #ifdef HAVE_REALPATH
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419
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420 /* Return the canonicalized absolute pathname. Encode path to the locale
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421 encoding, decode the result from the locale encoding.
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422 Return NULL on error. */
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423
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424 wchar_t*
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425 _Py_wrealpath(const wchar_t *path,
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426 wchar_t *resolved_path, size_t resolved_path_size)
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427 {
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428 char *cpath;
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429 char cresolved_path[PATH_MAX];
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430 wchar_t *wresolved_path;
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431 char *res;
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432 size_t r;
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433 cpath = _Py_wchar2char(path, NULL);
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434 if (cpath == NULL) {
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435 errno = EINVAL;
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436 return NULL;
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437 }
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438 res = realpath(cpath, cresolved_path);
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439 PyMem_Free(cpath);
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440 if (res == NULL)
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441 return NULL;
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442
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443 wresolved_path = _Py_char2wchar(cresolved_path, &r);
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444 if (wresolved_path == NULL) {
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445 errno = EINVAL;
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446 return NULL;
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447 }
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448 if (resolved_path_size <= r) {
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449 PyMem_Free(wresolved_path);
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450 errno = EINVAL;
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451 return NULL;
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452 }
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453 wcsncpy(resolved_path, wresolved_path, resolved_path_size);
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454 PyMem_Free(wresolved_path);
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455 return resolved_path;
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456 }
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457 #endif
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458
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459 /* Get the current directory. size is the buffer size in wide characters
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460 including the null character. Decode the path from the locale encoding.
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461 Return NULL on error. */
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462
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463 wchar_t*
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464 _Py_wgetcwd(wchar_t *buf, size_t size)
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465 {
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466 #ifdef MS_WINDOWS
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467 return _wgetcwd(buf, size);
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468 #else
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469 char fname[PATH_MAX];
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470 wchar_t *wname;
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471 size_t len;
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472
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473 if (getcwd(fname, PATH_MAX) == NULL)
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474 return NULL;
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475 wname = _Py_char2wchar(fname, &len);
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476 if (wname == NULL)
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477 return NULL;
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478 if (size <= len) {
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479 PyMem_Free(wname);
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480 return NULL;
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481 }
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482 wcsncpy(buf, wname, size);
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483 PyMem_Free(wname);
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484 return buf;
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485 #endif
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486 }
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487
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488 #endif