Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_win.c @ 39496:352ffe77b71d legacy-trunk

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Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 42808526511c
children 06145fbc7ab9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include <windows.h>
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5 #ifdef HAVE_DIRECT_H
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6 #include <direct.h>
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7 #endif
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8 #include <ctype.h>
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9
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10 #include "Python.h"
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11 #include "importdl.h"
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12
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13 const struct filedescr _PyImport_DynLoadFiletab[] = {
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14 #ifdef _DEBUG
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15 {"_d.pyd", "rb", C_EXTENSION},
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16 /* Temporarily disable .dll, to avoid conflicts between sqlite3.dll
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17 and the sqlite3 package. If this needs to be reverted for 2.5,
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18 some other solution for the naming conflict must be found.
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19 {"_d.dll", "rb", C_EXTENSION},
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20 */
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21 #else
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22 {".pyd", "rb", C_EXTENSION},
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23 /* Likewise
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24 {".dll", "rb", C_EXTENSION},
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25 */
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26 #endif
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27 {0, 0}
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28 };
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29
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30
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31 /* Case insensitive string compare, to avoid any dependencies on particular
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32 C RTL implementations */
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33
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34 static int strcasecmp (char *string1, char *string2)
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35 {
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36 int first, second;
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37
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38 do {
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39 first = tolower(*string1);
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40 second = tolower(*string2);
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41 string1++;
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42 string2++;
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43 } while (first && first == second);
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44
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45 return (first - second);
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46 }
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47
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48
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49 /* Function to return the name of the "python" DLL that the supplied module
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50 directly imports. Looks through the list of imported modules and
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51 returns the first entry that starts with "python" (case sensitive) and
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52 is followed by nothing but numbers until the separator (period).
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53
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54 Returns a pointer to the import name, or NULL if no matching name was
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55 located.
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56
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57 This function parses through the PE header for the module as loaded in
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58 memory by the system loader. The PE header is accessed as documented by
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59 Microsoft in the MSDN PE and COFF specification (2/99), and handles
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60 both PE32 and PE32+. It only worries about the direct import table and
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61 not the delay load import table since it's unlikely an extension is
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62 going to be delay loading Python (after all, it's already loaded).
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63
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64 If any magic values are not found (e.g., the PE header or optional
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65 header magic), then this function simply returns NULL. */
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66
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67 #define DWORD_AT(mem) (*(DWORD *)(mem))
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68 #define WORD_AT(mem) (*(WORD *)(mem))
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69
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70 static char *GetPythonImport (HINSTANCE hModule)
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71 {
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72 unsigned char *dllbase, *import_data, *import_name;
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73 DWORD pe_offset, opt_offset;
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74 WORD opt_magic;
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75 int num_dict_off, import_off;
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76
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77 /* Safety check input */
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78 if (hModule == NULL) {
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79 return NULL;
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80 }
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81
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82 /* Module instance is also the base load address. First portion of
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83 memory is the MS-DOS loader, which holds the offset to the PE
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84 header (from the load base) at 0x3C */
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85 dllbase = (unsigned char *)hModule;
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86 pe_offset = DWORD_AT(dllbase + 0x3C);
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87
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88 /* The PE signature must be "PE\0\0" */
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89 if (memcmp(dllbase+pe_offset,"PE\0\0",4)) {
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90 return NULL;
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91 }
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92
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93 /* Following the PE signature is the standard COFF header (20
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94 bytes) and then the optional header. The optional header starts
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95 with a magic value of 0x10B for PE32 or 0x20B for PE32+ (PE32+
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96 uses 64-bits for some fields). It might also be 0x107 for a ROM
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97 image, but we don't process that here.
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98
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99 The optional header ends with a data dictionary that directly
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100 points to certain types of data, among them the import entries
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101 (in the second table entry). Based on the header type, we
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102 determine offsets for the data dictionary count and the entry
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103 within the dictionary pointing to the imports. */
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104
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105 opt_offset = pe_offset + 4 + 20;
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106 opt_magic = WORD_AT(dllbase+opt_offset);
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107 if (opt_magic == 0x10B) {
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108 /* PE32 */
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109 num_dict_off = 92;
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110 import_off = 104;
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111 } else if (opt_magic == 0x20B) {
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112 /* PE32+ */
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113 num_dict_off = 108;
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114 import_off = 120;
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115 } else {
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116 /* Unsupported */
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117 return NULL;
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118 }
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119
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120 /* Now if an import table exists, offset to it and walk the list of
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121 imports. The import table is an array (ending when an entry has
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122 empty values) of structures (20 bytes each), which contains (at
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123 offset 12) a relative address (to the module base) at which a
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124 string constant holding the import name is located. */
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125
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126 if (DWORD_AT(dllbase + opt_offset + num_dict_off) >= 2) {
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127 /* We have at least 2 tables - the import table is the second
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128 one. But still it may be that the table size is zero */
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129 if (0 == DWORD_AT(dllbase + opt_offset + import_off + sizeof(DWORD)))
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130 return NULL;
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131 import_data = dllbase + DWORD_AT(dllbase +
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132 opt_offset +
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133 import_off);
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134 while (DWORD_AT(import_data)) {
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135 import_name = dllbase + DWORD_AT(import_data+12);
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136 if (strlen(import_name) >= 6 &&
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137 !strncmp(import_name,"python",6)) {
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138 char *pch;
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139
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140 /* Ensure python prefix is followed only
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141 by numbers to the end of the basename */
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142 pch = import_name + 6;
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143 #ifdef _DEBUG
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144 while (*pch && pch[0] != '_' && pch[1] != 'd' && pch[2] != '.') {
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145 #else
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146 while (*pch && *pch != '.') {
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147 #endif
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148 if (*pch >= '0' && *pch <= '9') {
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149 pch++;
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150 } else {
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151 pch = NULL;
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152 break;
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153 }
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154 }
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155
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156 if (pch) {
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157 /* Found it - return the name */
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158 return import_name;
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159 }
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160 }
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161 import_data += 20;
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162 }
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163 }
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164
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165 return NULL;
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166 }
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167
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168
11618
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169 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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170 const char *pathname, FILE *fp)
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171 {
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172 dl_funcptr p;
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173 char funcname[258], *import_python;
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174
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175 PyOS_snprintf(funcname, sizeof(funcname), "init%.200s", shortname);
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176
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177 {
17713
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178 HINSTANCE hDLL = NULL;
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179 char pathbuf[260];
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180 LPTSTR dummy;
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181 /* We use LoadLibraryEx so Windows looks for dependent DLLs
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182 in directory of pathname first. However, Windows95
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183 can sometimes not work correctly unless the absolute
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184 path is used. If GetFullPathName() fails, the LoadLibrary
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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185 will certainly fail too, so use its error code */
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186 if (GetFullPathName(pathname,
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187 sizeof(pathbuf),
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188 pathbuf,
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189 &dummy))
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190 /* XXX This call doesn't exist in Windows CE */
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191 hDLL = LoadLibraryEx(pathname, NULL,
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diff changeset
192 LOAD_WITH_ALTERED_SEARCH_PATH);
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193 if (hDLL==NULL){
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194 char errBuf[256];
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195 unsigned int errorCode;
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196
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197 /* Get an error string from Win32 error code */
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198 char theInfo[256]; /* Pointer to error text
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diff changeset
199 from system */
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200 int theLength; /* Length of error text */
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201
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diff changeset
202 errorCode = GetLastError();
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diff changeset
203
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
204 theLength = FormatMessage(
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diff changeset
205 FORMAT_MESSAGE_FROM_SYSTEM, /* flags */
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parents:
diff changeset
206 NULL, /* message source */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
207 errorCode, /* the message (error) ID */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
208 0, /* default language environment */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
209 (LPTSTR) theInfo, /* the buffer */
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parents:
diff changeset
210 sizeof(theInfo), /* the buffer size */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
211 NULL); /* no additional format args. */
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parents:
diff changeset
212
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
213 /* Problem: could not get the error message.
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Guido van Rossum <guido@python.org>
parents:
diff changeset
214 This should not happen if called correctly. */
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parents:
diff changeset
215 if (theLength == 0) {
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diff changeset
216 PyOS_snprintf(errBuf, sizeof(errBuf),
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
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diff changeset
217 "DLL load failed with error code %d",
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
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diff changeset
218 errorCode);
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
219 } else {
13096
8c8de5b736dc Trent Mick's Win64 changes: size_t vs. int or long; also some overflow
Guido van Rossum <guido@python.org>
parents: 11618
diff changeset
220 size_t len;
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
221 /* For some reason a \r\n
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
222 is appended to the text */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
223 if (theLength >= 2 &&
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
224 theInfo[theLength-2] == '\r' &&
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Guido van Rossum <guido@python.org>
parents:
diff changeset
225 theInfo[theLength-1] == '\n') {
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
226 theLength -= 2;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
227 theInfo[theLength] = '\0';
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
228 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
229 strcpy(errBuf, "DLL load failed: ");
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 len = strlen(errBuf);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 strncpy(errBuf+len, theInfo,
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
232 sizeof(errBuf)-len);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
233 errBuf[sizeof(errBuf)-1] = '\0';
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
234 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
235 PyErr_SetString(PyExc_ImportError, errBuf);
25041
ed0b02672f09 Fix a couple of whitespace consistency nits.
Fred Drake <fdrake@acm.org>
parents: 24071
diff changeset
236 return NULL;
15027
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237 } else {
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diff changeset
238 char buffer[256];
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
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diff changeset
239
32469
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
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diff changeset
240 #ifdef _DEBUG
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
241 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d_d.dll",
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
242 #else
21077
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
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diff changeset
243 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d.dll",
32469
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
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diff changeset
244 #endif
25041
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Fred Drake <fdrake@acm.org>
parents: 24071
diff changeset
245 PY_MAJOR_VERSION,PY_MINOR_VERSION);
15027
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246 import_python = GetPythonImport(hDLL);
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diff changeset
247
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
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diff changeset
248 if (import_python &&
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
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diff changeset
249 strcasecmp(buffer,import_python)) {
21077
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diff changeset
250 PyOS_snprintf(buffer, sizeof(buffer),
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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251 "Module use of %.150s conflicts "
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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252 "with this version of Python.",
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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253 import_python);
15027
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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254 PyErr_SetString(PyExc_ImportError,buffer);
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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255 FreeLibrary(hDLL);
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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256 return NULL;
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
257 }
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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258 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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259 p = GetProcAddress(hDLL, funcname);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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260 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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261
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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262 return p;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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263 }