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annotate Python/fileutils.c @ 73776:c86fb10eaf68

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Issue #7111: Python can now be run without a stdin, stdout or stderr stream. It was already the case with Python 2. However, the corresponding sys module entries are now set to None (instead of an unusable file object).
author Antoine Pitrou <solipsis@pitrou.net>
date Mon, 28 Nov 2011 19:09:45 +0100
parents 94a38ad4aebf
children 279b0aee0cfb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2 #ifdef MS_WINDOWS
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3 # include <windows.h>
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4 #endif
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5
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6 #ifdef HAVE_STAT
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7
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8 /* Decode a byte string from the locale encoding with the
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9 surrogateescape error handler (undecodable bytes are decoded as characters
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10 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
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11 character, escape the bytes using the surrogateescape error handler instead
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12 of decoding them.
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13
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14 Use _Py_wchar2char() to encode the character string back to a byte string.
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15
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16 Return a pointer to a newly allocated wide character string (use
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17 PyMem_Free() to free the memory) and write the number of written wide
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18 characters excluding the null character into *size if size is not NULL, or
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19 NULL on error (conversion or memory allocation error).
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20
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21 Conversion errors should never happen, unless there is a bug in the C
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22 library. */
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23 wchar_t*
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24 _Py_char2wchar(const char* arg, size_t *size)
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25 {
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26 wchar_t *res;
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27 #ifdef HAVE_BROKEN_MBSTOWCS
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28 /* Some platforms have a broken implementation of
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29 * mbstowcs which does not count the characters that
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30 * would result from conversion. Use an upper bound.
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31 */
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32 size_t argsize = strlen(arg);
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33 #else
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34 size_t argsize = mbstowcs(NULL, arg, 0);
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35 #endif
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36 size_t count;
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37 unsigned char *in;
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38 wchar_t *out;
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39 #ifdef HAVE_MBRTOWC
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40 mbstate_t mbs;
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41 #endif
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42 if (argsize != (size_t)-1) {
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43 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
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44 if (!res)
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45 goto oom;
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46 count = mbstowcs(res, arg, argsize+1);
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47 if (count != (size_t)-1) {
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48 wchar_t *tmp;
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49 /* Only use the result if it contains no
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50 surrogate characters. */
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51 for (tmp = res; *tmp != 0 &&
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52 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
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53 ;
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54 if (*tmp == 0) {
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55 if (size != NULL)
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56 *size = count;
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57 return res;
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58 }
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59 }
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60 PyMem_Free(res);
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61 }
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62 /* Conversion failed. Fall back to escaping with surrogateescape. */
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63 #ifdef HAVE_MBRTOWC
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64 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
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65
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66 /* Overallocate; as multi-byte characters are in the argument, the
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67 actual output could use less memory. */
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68 argsize = strlen(arg) + 1;
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69 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
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70 if (!res)
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71 goto oom;
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72 in = (unsigned char*)arg;
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73 out = res;
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74 memset(&mbs, 0, sizeof mbs);
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75 while (argsize) {
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76 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
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77 if (converted == 0)
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78 /* Reached end of string; null char stored. */
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79 break;
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80 if (converted == (size_t)-2) {
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81 /* Incomplete character. This should never happen,
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82 since we provide everything that we have -
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83 unless there is a bug in the C library, or I
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84 misunderstood how mbrtowc works. */
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85 fprintf(stderr, "unexpected mbrtowc result -2\n");
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86 PyMem_Free(res);
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87 return NULL;
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88 }
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89 if (converted == (size_t)-1) {
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90 /* Conversion error. Escape as UTF-8b, and start over
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91 in the initial shift state. */
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92 *out++ = 0xdc00 + *in++;
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93 argsize--;
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94 memset(&mbs, 0, sizeof mbs);
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95 continue;
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96 }
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97 if (*out >= 0xd800 && *out <= 0xdfff) {
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98 /* Surrogate character. Escape the original
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99 byte sequence with surrogateescape. */
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100 argsize -= converted;
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101 while (converted--)
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102 *out++ = 0xdc00 + *in++;
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103 continue;
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104 }
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105 /* successfully converted some bytes */
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106 in += converted;
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107 argsize -= converted;
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108 out++;
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109 }
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110 #else
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111 /* Cannot use C locale for escaping; manually escape as if charset
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112 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
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113 correctly in the locale's charset, which must be an ASCII superset. */
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114 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
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115 if (!res) goto oom;
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116 in = (unsigned char*)arg;
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117 out = res;
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118 while(*in)
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119 if(*in < 128)
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120 *out++ = *in++;
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121 else
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122 *out++ = 0xdc00 + *in++;
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123 *out = 0;
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124 #endif
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125 if (size != NULL)
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126 *size = out - res;
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127 return res;
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128 oom:
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129 fprintf(stderr, "out of memory\n");
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130 return NULL;
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131 }
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132
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133 /* Encode a (wide) character string to the locale encoding with the
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134 surrogateescape error handler (characters in range U+DC80..U+DCFF are
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135 converted to bytes 0x80..0xFF).
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136
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137 This function is the reverse of _Py_char2wchar().
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138
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139 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
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140 the memory), or NULL on conversion or memory allocation error.
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141
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142 If error_pos is not NULL: *error_pos is the index of the invalid character
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143 on conversion error, or (size_t)-1 otherwise. */
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144 char*
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145 _Py_wchar2char(const wchar_t *text, size_t *error_pos)
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146 {
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147 const size_t len = wcslen(text);
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148 char *result = NULL, *bytes = NULL;
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149 size_t i, size, converted;
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150 wchar_t c, buf[2];
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151
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152 if (error_pos != NULL)
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153 *error_pos = (size_t)-1;
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154
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155 /* The function works in two steps:
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156 1. compute the length of the output buffer in bytes (size)
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157 2. outputs the bytes */
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158 size = 0;
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159 buf[1] = 0;
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160 while (1) {
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161 for (i=0; i < len; i++) {
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162 c = text[i];
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163 if (c >= 0xdc80 && c <= 0xdcff) {
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164 /* UTF-8b surrogate */
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165 if (bytes != NULL) {
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166 *bytes++ = c - 0xdc00;
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167 size--;
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168 }
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169 else
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170 size++;
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171 continue;
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172 }
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173 else {
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174 buf[0] = c;
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175 if (bytes != NULL)
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176 converted = wcstombs(bytes, buf, size);
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177 else
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178 converted = wcstombs(NULL, buf, 0);
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179 if (converted == (size_t)-1) {
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180 if (result != NULL)
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181 PyMem_Free(result);
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182 if (error_pos != NULL)
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183 *error_pos = i;
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184 return NULL;
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185 }
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186 if (bytes != NULL) {
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187 bytes += converted;
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188 size -= converted;
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189 }
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190 else
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191 size += converted;
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192 }
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193 }
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194 if (result != NULL) {
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195 *bytes = 0;
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196 break;
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197 }
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198
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199 size += 1; /* nul byte at the end */
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200 result = PyMem_Malloc(size);
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201 if (result == NULL)
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202 return NULL;
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203 bytes = result;
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204 }
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205 return result;
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206 }
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207
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208 /* In principle, this should use HAVE__WSTAT, and _wstat
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209 should be detected by autoconf. However, no current
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210 POSIX system provides that function, so testing for
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211 it is pointless.
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212 Not sure whether the MS_WINDOWS guards are necessary:
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213 perhaps for cygwin/mingw builds?
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214 */
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215 #if defined(HAVE_STAT) && !defined(MS_WINDOWS)
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216
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217 /* Get file status. Encode the path to the locale encoding. */
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218
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219 int
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220 _Py_wstat(const wchar_t* path, struct stat *buf)
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221 {
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222 int err;
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223 char *fname;
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224 fname = _Py_wchar2char(path, NULL);
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225 if (fname == NULL) {
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226 errno = EINVAL;
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227 return -1;
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228 }
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229 err = stat(fname, buf);
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230 PyMem_Free(fname);
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231 return err;
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232 }
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233 #endif
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234
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235 /* Call _wstat() on Windows, or encode the path to the filesystem encoding and
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236 call stat() otherwise. Only fill st_mode attribute on Windows.
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237
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238 Return 0 on success, -1 on _wstat() / stat() error or (if PyErr_Occurred())
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239 unicode error. */
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240
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241 int
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242 _Py_stat(PyObject *path, struct stat *statbuf)
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243 {
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244 #ifdef MS_WINDOWS
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245 int err;
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246 struct _stat wstatbuf;
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247 wchar_t *wpath;
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248
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249 wpath = PyUnicode_AsUnicode(path);
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250 if (wpath == NULL)
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251 return -1;
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252 err = _wstat(wpath, &wstatbuf);
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253 if (!err)
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254 statbuf->st_mode = wstatbuf.st_mode;
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255 return err;
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256 #else
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257 int ret;
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258 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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259 if (bytes == NULL)
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260 return -1;
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261 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
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262 Py_DECREF(bytes);
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263 return ret;
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264 #endif
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265 }
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266
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267 /* Open a file. Use _wfopen() on Windows, encode the path to the locale
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268 encoding and use fopen() otherwise. */
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269
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270 FILE *
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271 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
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272 {
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273 #ifndef MS_WINDOWS
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274 FILE *f;
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275 char *cpath;
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276 char cmode[10];
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277 size_t r;
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278 r = wcstombs(cmode, mode, 10);
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279 if (r == (size_t)-1 || r >= 10) {
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280 errno = EINVAL;
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281 return NULL;
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282 }
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283 cpath = _Py_wchar2char(path, NULL);
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284 if (cpath == NULL)
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285 return NULL;
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286 f = fopen(cpath, cmode);
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287 PyMem_Free(cpath);
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288 return f;
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289 #else
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290 return _wfopen(path, mode);
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291 #endif
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292 }
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293
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294 /* Call _wfopen() on Windows, or encode the path to the filesystem encoding and
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295 call fopen() otherwise.
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296
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297 Return the new file object on success, or NULL if the file cannot be open or
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298 (if PyErr_Occurred()) on unicode error */
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299
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300 FILE*
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301 _Py_fopen(PyObject *path, const char *mode)
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302 {
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303 #ifdef MS_WINDOWS
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304 wchar_t *wpath;
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305 wchar_t wmode[10];
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306 int usize;
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307
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308 wpath = PyUnicode_AsUnicode(path);
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309 if (wpath == NULL)
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310 return NULL;
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311
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312 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
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313 if (usize == 0)
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314 return NULL;
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315
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316 return _wfopen(wpath, wmode);
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317 #else
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318 FILE *f;
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319 PyObject *bytes = PyUnicode_EncodeFSDefault(path);
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320 if (bytes == NULL)
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321 return NULL;
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322 f = fopen(PyBytes_AS_STRING(bytes), mode);
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323 Py_DECREF(bytes);
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324 return f;
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325 #endif
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326 }
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327
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328 #ifdef HAVE_READLINK
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329
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330 /* Read value of symbolic link. Encode the path to the locale encoding, decode
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331 the result from the locale encoding. */
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332
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333 int
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334 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
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335 {
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336 char *cpath;
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337 char cbuf[PATH_MAX];
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338 wchar_t *wbuf;
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339 int res;
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340 size_t r1;
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341
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342 cpath = _Py_wchar2char(path, NULL);
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343 if (cpath == NULL) {
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344 errno = EINVAL;
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345 return -1;
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346 }
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347 res = (int)readlink(cpath, cbuf, PATH_MAX);
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348 PyMem_Free(cpath);
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349 if (res == -1)
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350 return -1;
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351 if (res == PATH_MAX) {
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352 errno = EINVAL;
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353 return -1;
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354 }
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355 cbuf[res] = '\0'; /* buf will be null terminated */
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356 wbuf = _Py_char2wchar(cbuf, &r1);
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357 if (wbuf == NULL) {
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358 errno = EINVAL;
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359 return -1;
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360 }
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361 if (bufsiz <= r1) {
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362 PyMem_Free(wbuf);
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363 errno = EINVAL;
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364 return -1;
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365 }
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366 wcsncpy(buf, wbuf, bufsiz);
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367 PyMem_Free(wbuf);
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368 return (int)r1;
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369 }
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370 #endif
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371
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372 #ifdef HAVE_REALPATH
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373
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374 /* Return the canonicalized absolute pathname. Encode path to the locale
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375 encoding, decode the result from the locale encoding. */
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376
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377 wchar_t*
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378 _Py_wrealpath(const wchar_t *path,
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379 wchar_t *resolved_path, size_t resolved_path_size)
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380 {
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381 char *cpath;
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382 char cresolved_path[PATH_MAX];
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383 wchar_t *wresolved_path;
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384 char *res;
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385 size_t r;
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386 cpath = _Py_wchar2char(path, NULL);
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387 if (cpath == NULL) {
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388 errno = EINVAL;
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389 return NULL;
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390 }
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391 res = realpath(cpath, cresolved_path);
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392 PyMem_Free(cpath);
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393 if (res == NULL)
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394 return NULL;
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395
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396 wresolved_path = _Py_char2wchar(cresolved_path, &r);
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397 if (wresolved_path == NULL) {
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398 errno = EINVAL;
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399 return NULL;
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400 }
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401 if (resolved_path_size <= r) {
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402 PyMem_Free(wresolved_path);
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403 errno = EINVAL;
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diff changeset
404 return NULL;
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diff changeset
405 }
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diff changeset
406 wcsncpy(resolved_path, wresolved_path, resolved_path_size);
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diff changeset
407 PyMem_Free(wresolved_path);
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408 return resolved_path;
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diff changeset
409 }
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410 #endif
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411
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diff changeset
412 /* Get the current directory. size is the buffer size in wide characters
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diff changeset
413 including the null character. Decode the path from the locale encoding. */
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414
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415 wchar_t*
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416 _Py_wgetcwd(wchar_t *buf, size_t size)
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diff changeset
417 {
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418 #ifdef MS_WINDOWS
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419 return _wgetcwd(buf, size);
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420 #else
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diff changeset
421 char fname[PATH_MAX];
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diff changeset
422 wchar_t *wname;
65412
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423 size_t len;
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424
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425 if (getcwd(fname, PATH_MAX) == NULL)
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426 return NULL;
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427 wname = _Py_char2wchar(fname, &len);
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parents: 65168
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428 if (wname == NULL)
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parents: 65168
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429 return NULL;
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parents: 65411
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430 if (size <= len) {
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431 PyMem_Free(wname);
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432 return NULL;
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433 }
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parents: 65168
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434 wcsncpy(buf, wname, size);
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parents: 65168
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435 PyMem_Free(wname);
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436 return buf;
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437 #endif
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438 }
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439
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440 #endif