mirror of
https://github.com/python/cpython.git
synced 2024-11-30 01:16:51 +01:00
472 lines
10 KiB
C
472 lines
10 KiB
C
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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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