mirror of https://github.com/python/cpython
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/********************************************************************
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import_nt.c
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Win32 specific import code.
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*/
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#include "Python.h"
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#include "osdefs.h"
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#include <windows.h>
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#include "importdl.h"
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#include "malloc.h" // for alloca
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extern const char *PyWin_DLLVersionString; // a string loaded from the DLL at startup.
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/* Return whether this is Win32s, i.e., Win32 API on Win 3.1(1).
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This function is exported! */
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BOOL PyWin_IsWin32s()
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{
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static BOOL bIsWin32s = -1; /* flag as "not yet looked" */
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if (bIsWin32s == -1) {
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OSVERSIONINFO ver;
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ver.dwOSVersionInfoSize = sizeof(ver);
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GetVersionEx(&ver);
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bIsWin32s = ver.dwPlatformId == VER_PLATFORM_WIN32s;
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}
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return bIsWin32s;
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}
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FILE *PyWin_FindRegisteredModule( const char *moduleName, struct filedescr **ppFileDesc, char *pathBuf, int pathLen)
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{
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char *moduleKey;
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char *pos;
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const char keyPrefix[] = "Software\\Python\\PythonCore\\";
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const char keySuffix[] = "\\Modules\\";
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struct filedescr *fdp = NULL;
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FILE *fp;
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int modNameSize = pathLen;
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int versionLen, moduleLen;
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HKEY keyBase = PyWin_IsWin32s() ? HKEY_CLASSES_ROOT : HKEY_LOCAL_MACHINE;
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// conceptually, this code is setting up:
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// sprintf(buf, "Software\\Python\\PythonCore\\%s\\Modules\\%s", PyWin_DLLVersionString, moduleName);
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// the sprintf would be clearer, but slower and less "length-safe"
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versionLen = strlen(PyWin_DLLVersionString);
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moduleLen = strlen(moduleName);
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// alloca == no free required, but memory only local to fn, also no heap fragmentation!
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moduleKey = alloca(sizeof(keyPrefix)-1 + versionLen + sizeof(keySuffix) + moduleLen); // chars only, plus 1 NULL.
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pos = moduleKey;
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memcpy(pos, keyPrefix, sizeof(keyPrefix)-1);
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pos += sizeof(keyPrefix)-1;
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memcpy(pos, PyWin_DLLVersionString, versionLen);
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pos +=versionLen;
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memcpy(pos, keySuffix, sizeof(keySuffix));
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pos += sizeof(keySuffix)-1;
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memcpy(pos, moduleName, moduleLen+1); // NULL comes with this one!
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if (RegQueryValue(keyBase, moduleKey, pathBuf, &modNameSize)!=ERROR_SUCCESS)
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return NULL;
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// use the file extension to locate the type entry.
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for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) {
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int extLen=strlen(fdp->suffix);
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if (modNameSize>extLen && strnicmp(pathBuf+(modNameSize-extLen-1),fdp->suffix,extLen)==0)
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break;
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}
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if (fdp->suffix==NULL)
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return NULL;
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fp = fopen(pathBuf, fdp->mode);
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if (fp != NULL)
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*ppFileDesc = fdp;
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return fp;
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}
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