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471 lines
11 KiB
471 lines
11 KiB
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/* Return the initial module search path. */ |
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/* Used by DOS, OS/2, Windows 3.1. Works on NT too. */ |
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#include "Python.h" |
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#include "osdefs.h" |
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#ifdef MS_WIN32 |
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#include <windows.h> |
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extern BOOL PyWin_IsWin32s(void); |
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#endif |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <string.h> |
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#if HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif /* HAVE_UNISTD_H */ |
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/* Search in some common locations for the associated Python libraries. |
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* |
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* Two directories must be found, the platform independent directory |
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* (prefix), containing the common .py and .pyc files, and the platform |
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* dependent directory (exec_prefix), containing the shared library |
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* modules. Note that prefix and exec_prefix can be the same directory, |
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* but for some installations, they are different. |
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* |
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* Py_GetPath() tries to return a sensible Python module search path. |
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* |
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* First, we look to see if the executable is in a subdirectory of |
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* the Python build directory. We calculate the full path of the |
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* directory containing the executable as progpath. We work backwards |
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* along progpath and look for $dir/Modules/Setup.in, a distinctive |
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* landmark. If found, we use $dir/Lib as $root. The returned |
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* Python path is the compiled #define PYTHONPATH with all the initial |
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* "./lib" replaced by $root. |
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* |
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* Otherwise, if there is a PYTHONPATH environment variable, we return that. |
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* |
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* Otherwise we try to find $progpath/lib/os.py, and if found, then |
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* root is $progpath/lib, and we return Python path as compiled PYTHONPATH |
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* with all "./lib" replaced by $root (as above). |
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* |
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*/ |
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#ifndef LANDMARK |
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#define LANDMARK "lib\\os.py" |
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#endif |
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static char prefix[MAXPATHLEN+1]; |
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static char exec_prefix[MAXPATHLEN+1]; |
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static char progpath[MAXPATHLEN+1]; |
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static char *module_search_path = NULL; |
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static int |
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is_sep(char ch) /* determine if "ch" is a separator character */ |
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{ |
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#ifdef ALTSEP |
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return ch == SEP || ch == ALTSEP; |
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#else |
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return ch == SEP; |
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#endif |
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} |
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static void |
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reduce(char *dir) |
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{ |
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int i = strlen(dir); |
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while (i > 0 && !is_sep(dir[i])) |
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--i; |
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dir[i] = '\0'; |
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} |
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static int |
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exists(char *filename) |
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{ |
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struct stat buf; |
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return stat(filename, &buf) == 0; |
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} |
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static void |
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join(char *buffer, char *stuff) |
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{ |
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int n, k; |
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if (is_sep(stuff[0])) |
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n = 0; |
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else { |
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n = strlen(buffer); |
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if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN) |
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buffer[n++] = SEP; |
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} |
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k = strlen(stuff); |
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if (n + k > MAXPATHLEN) |
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k = MAXPATHLEN - n; |
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strncpy(buffer+n, stuff, k); |
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buffer[n+k] = '\0'; |
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} |
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static int |
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search_for_prefix(char *argv0_path, char *landmark) |
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{ |
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int n; |
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/* Search from argv0_path, until root is found */ |
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strcpy(prefix, argv0_path); |
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do { |
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n = strlen(prefix); |
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join(prefix, landmark); |
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if (exists(prefix)) { |
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prefix[n] = '\0'; |
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return 1; |
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} |
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prefix[n] = '\0'; |
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reduce(prefix); |
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} while (prefix[0]); |
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return 0; |
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} |
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#ifdef MS_WIN32 |
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#include "malloc.h" // for alloca - see comments below! |
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extern const char *PyWin_DLLVersionString; // a string loaded from the DLL at startup. |
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/* Load a PYTHONPATH value from the registry. |
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Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER. |
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Returns NULL, or a pointer that should be freed. |
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*/ |
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static char * |
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getpythonregpath(HKEY keyBase, BOOL bWin32s) |
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{ |
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HKEY newKey = 0; |
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DWORD nameSize = 0; |
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DWORD dataSize = 0; |
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DWORD numEntries = 0; |
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LONG rc; |
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char *retval = NULL; |
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char *dataBuf; |
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const char keyPrefix[] = "Software\\Python\\PythonCore\\"; |
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const char keySuffix[] = "\\PythonPath"; |
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int versionLen; |
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char *keyBuf; |
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// Tried to use sysget("winver") but here is too early :-( |
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versionLen = strlen(PyWin_DLLVersionString); |
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// alloca == no free required, but memory only local to fn. |
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// also no heap fragmentation! Am I being silly? |
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keyBuf = alloca(sizeof(keyPrefix)-1 + versionLen + sizeof(keySuffix)); // chars only, plus 1 NULL. |
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// lots of constants here for the compiler to optimize away :-) |
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memcpy(keyBuf, keyPrefix, sizeof(keyPrefix)-1); |
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memcpy(keyBuf+sizeof(keyPrefix)-1, PyWin_DLLVersionString, versionLen); |
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memcpy(keyBuf+sizeof(keyPrefix)-1+versionLen, keySuffix, sizeof(keySuffix)); // NULL comes with this one! |
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rc=RegOpenKey(keyBase, |
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keyBuf, |
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&newKey); |
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if (rc==ERROR_SUCCESS) { |
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RegQueryInfoKey(newKey, NULL, NULL, NULL, NULL, NULL, NULL, |
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&numEntries, &nameSize, &dataSize, NULL, NULL); |
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} |
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if (bWin32s && numEntries==0 && dataSize==0) { |
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/* must hardcode for Win32s */ |
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numEntries = 1; |
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dataSize = 511; |
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} |
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if (numEntries) { |
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/* Loop over all subkeys. */ |
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/* Win32s doesnt know how many subkeys, so we do |
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it twice */ |
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char keyBuf[MAX_PATH+1]; |
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int index = 0; |
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int off = 0; |
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for(index=0;;index++) { |
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long reqdSize = 0; |
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DWORD rc = RegEnumKey(newKey, |
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index, keyBuf, MAX_PATH+1); |
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if (rc) break; |
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rc = RegQueryValue(newKey, keyBuf, NULL, &reqdSize); |
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if (rc) break; |
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if (bWin32s && reqdSize==0) reqdSize = 512; |
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dataSize += reqdSize + 1; /* 1 for the ";" */ |
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} |
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dataBuf = malloc(dataSize+1); |
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if (dataBuf==NULL) |
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return NULL; /* pretty serious? Raise error? */ |
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/* Now loop over, grabbing the paths. |
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Subkeys before main library */ |
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for(index=0;;index++) { |
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int adjust; |
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long reqdSize = dataSize; |
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DWORD rc = RegEnumKey(newKey, |
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index, keyBuf,MAX_PATH+1); |
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if (rc) break; |
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rc = RegQueryValue(newKey, |
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keyBuf, dataBuf+off, &reqdSize); |
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if (rc) break; |
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if (reqdSize>1) { |
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/* If Nothing, or only '\0' copied. */ |
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adjust = strlen(dataBuf+off); |
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dataSize -= adjust; |
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off += adjust; |
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dataBuf[off++] = ';'; |
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dataBuf[off] = '\0'; |
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dataSize--; |
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} |
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} |
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/* Additionally, win32s doesnt work as expected, so |
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the specific strlen() is required for 3.1. */ |
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rc = RegQueryValue(newKey, "", dataBuf+off, &dataSize); |
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if (rc==ERROR_SUCCESS) { |
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if (strlen(dataBuf)==0) |
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free(dataBuf); |
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else |
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retval = dataBuf; /* caller will free */ |
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} |
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else |
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free(dataBuf); |
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} |
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if (newKey) |
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RegCloseKey(newKey); |
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return retval; |
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} |
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#endif /* MS_WIN32 */ |
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static void |
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get_progpath(void) |
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{ |
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extern char *Py_GetProgramName(void); |
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char *path = getenv("PATH"); |
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char *prog = Py_GetProgramName(); |
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#ifdef MS_WIN32 |
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if (GetModuleFileName(NULL, progpath, MAXPATHLEN)) |
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return; |
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#endif |
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if (prog == NULL || *prog == '\0') |
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prog = "python"; |
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/* If there is no slash in the argv0 path, then we have to |
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* assume python is on the user's $PATH, since there's no |
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* other way to find a directory to start the search from. If |
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* $PATH isn't exported, you lose. |
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*/ |
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#ifdef ALTSEP |
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if (strchr(prog, SEP) || strchr(prog, ALTSEP)) |
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#else |
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if (strchr(prog, SEP)) |
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#endif |
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strcpy(progpath, prog); |
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else if (path) { |
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while (1) { |
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char *delim = strchr(path, DELIM); |
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if (delim) { |
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int len = delim - path; |
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strncpy(progpath, path, len); |
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*(progpath + len) = '\0'; |
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} |
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else |
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strcpy(progpath, path); |
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join(progpath, prog); |
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if (exists(progpath)) |
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break; |
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if (!delim) { |
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progpath[0] = '\0'; |
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break; |
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} |
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path = delim + 1; |
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} |
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} |
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else |
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progpath[0] = '\0'; |
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} |
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static void |
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calculate_path(void) |
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{ |
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char argv0_path[MAXPATHLEN+1]; |
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char *buf; |
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int bufsz; |
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char *pythonhome = Py_GetPythonHome(); |
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char *envpath = Py_GETENV("PYTHONPATH"); |
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#ifdef MS_WIN32 |
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char *machinepath, *userpath; |
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/* Are we running under Windows 3.1(1) Win32s? */ |
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if (PyWin_IsWin32s()) { |
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/* Only CLASSES_ROOT is supported */ |
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machinepath = getpythonregpath(HKEY_CLASSES_ROOT, TRUE); |
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userpath = NULL; |
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} else { |
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machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, FALSE); |
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userpath = getpythonregpath(HKEY_CURRENT_USER, FALSE); |
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} |
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#endif |
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get_progpath(); |
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strcpy(argv0_path, progpath); |
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reduce(argv0_path); |
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if (pythonhome == NULL || *pythonhome == '\0') { |
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if (search_for_prefix(argv0_path, LANDMARK)) |
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pythonhome = prefix; |
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else |
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pythonhome = NULL; |
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} |
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else { |
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char *delim; |
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strcpy(prefix, pythonhome); |
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/* Extract Any Optional Trailing EXEC_PREFIX */ |
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/* e.g. PYTHONHOME=<prefix>:<exec_prefix> */ |
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delim = strchr(prefix, DELIM); |
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if (delim) { |
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*delim = '\0'; |
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strcpy(exec_prefix, delim+1); |
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} else |
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strcpy(exec_prefix, EXEC_PREFIX); |
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} |
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if (envpath && *envpath == '\0') |
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envpath = NULL; |
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/* We need to construct a path from the following parts: |
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(1) the PYTHONPATH environment variable, if set; |
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(2) for Win32, the machinepath and userpath, if set; |
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(3) the PYTHONPATH config macro, with the leading "." |
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of each component replaced with pythonhome, if set; |
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(4) the directory containing the executable (argv0_path). |
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The length calculation calculates #3 first. |
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*/ |
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/* Calculate size of return buffer */ |
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if (pythonhome != NULL) { |
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char *p; |
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bufsz = 1; |
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for (p = PYTHONPATH; *p; p++) { |
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if (*p == DELIM) |
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bufsz++; /* number of DELIM plus one */ |
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} |
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bufsz *= strlen(pythonhome); |
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} |
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else |
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bufsz = 0; |
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bufsz += strlen(PYTHONPATH) + 1; |
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if (envpath != NULL) |
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bufsz += strlen(envpath) + 1; |
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bufsz += strlen(argv0_path) + 1; |
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#ifdef MS_WIN32 |
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if (machinepath) |
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bufsz += strlen(machinepath) + 1; |
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if (userpath) |
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bufsz += strlen(userpath) + 1; |
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#endif |
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module_search_path = buf = malloc(bufsz); |
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if (buf == NULL) { |
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/* We can't exit, so print a warning and limp along */ |
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fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n"); |
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if (envpath) { |
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fprintf(stderr, "Using default static $PYTHONPATH.\n"); |
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module_search_path = envpath; |
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} |
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else { |
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fprintf(stderr, "Using environment $PYTHONPATH.\n"); |
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module_search_path = PYTHONPATH; |
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} |
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return; |
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} |
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if (envpath) { |
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strcpy(buf, envpath); |
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buf = strchr(buf, '\0'); |
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*buf++ = DELIM; |
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} |
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#ifdef MS_WIN32 |
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if (machinepath) { |
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strcpy(buf, machinepath); |
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buf = strchr(buf, '\0'); |
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*buf++ = DELIM; |
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} |
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if (userpath) { |
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strcpy(buf, userpath); |
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buf = strchr(buf, '\0'); |
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*buf++ = DELIM; |
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} |
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#endif |
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if (pythonhome == NULL) { |
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strcpy(buf, PYTHONPATH); |
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buf = strchr(buf, '\0'); |
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} |
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else { |
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char *p = PYTHONPATH; |
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char *q; |
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int n; |
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for (;;) { |
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q = strchr(p, DELIM); |
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if (q == NULL) |
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n = strlen(p); |
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else |
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n = q-p; |
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if (p[0] == '.' && is_sep(p[1])) { |
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strcpy(buf, pythonhome); |
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buf = strchr(buf, '\0'); |
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p++; |
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n--; |
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} |
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strncpy(buf, p, n); |
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buf += n; |
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if (q == NULL) |
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break; |
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*buf++ = DELIM; |
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p = q+1; |
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} |
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} |
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if (argv0_path) { |
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*buf++ = DELIM; |
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strcpy(buf, argv0_path); |
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buf = strchr(buf, '\0'); |
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} |
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*buf = '\0'; |
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} |
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/* External interface */ |
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char * |
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Py_GetPath(void) |
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{ |
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if (!module_search_path) |
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calculate_path(); |
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return module_search_path; |
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} |
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char * |
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Py_GetPrefix(void) |
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{ |
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if (!module_search_path) |
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calculate_path(); |
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return prefix; |
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} |
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char * |
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Py_GetExecPrefix(void) |
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{ |
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if (!module_search_path) |
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calculate_path(); |
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return exec_prefix; |
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} |
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char * |
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Py_GetProgramFullPath(void) |
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{ |
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if (!module_search_path) |
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calculate_path(); |
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return progpath; |
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}
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