mirror of https://github.com/python/cpython
617 lines
15 KiB
C
617 lines
15 KiB
C
/***********************************************************
|
|
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|
The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI or Corporation for National Research Initiatives or
|
|
CNRI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior
|
|
permission.
|
|
|
|
While CWI is the initial source for this software, a modified version
|
|
is made available by the Corporation for National Research Initiatives
|
|
(CNRI) at the Internet address ftp://ftp.python.org.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
|
|
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
|
|
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
|
|
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* Return the initial module search path. */
|
|
/* Used by DOS, OS/2, Windows 3.1, Windows 95/98, Windows NT. */
|
|
|
|
/* ----------------------------------------------------------------
|
|
PATH RULES FOR WINDOWS:
|
|
This describes how sys.path is formed on Windows. It describes the
|
|
functionality, not the implementation (ie, the order in which these
|
|
are actually fetched is different)
|
|
|
|
* Python always adds an empty entry at the start, which corresponds
|
|
to the current directory.
|
|
|
|
* If the PYTHONPATH env. var. exists, it's entries are added next.
|
|
|
|
* We look in the registry for "application paths" - that is, sub-keys
|
|
under the main PythonPath registry key. These are added next (the
|
|
order of sub-key processing is undefined).
|
|
HKEY_CURRENT_USER is searched and added first.
|
|
HKEY_LOCAL_MACHINE is searched and added next.
|
|
(Note that all known installers only use HKLM, so HKCU is typically
|
|
empty)
|
|
|
|
* We attempt to locate the "Python Home" - if the PYTHONHOME env var
|
|
is set, we believe it. Otherwise, we use the path of our host .EXE's
|
|
to try and locate our "landmark" (lib\\os.py) and deduce our home.
|
|
- If we DO have a Python Home: The relevant sub-directories (Lib,
|
|
plat-win, lib-tk, etc) are based on the Python Home
|
|
- If we DO NOT have a Python Home, the core Python Path is
|
|
loaded from the registry. This is the main PythonPath key,
|
|
and both HKLM and HKCU are combined to form the path)
|
|
|
|
* Iff - we can not locate the Python Home, have not had a PYTHONPATH
|
|
specified, and can't locate any Registry entries (ie, we have _nothing_
|
|
we can assume is a good path), a default path with relative entries is
|
|
used (eg. .\Lib;.\plat-win, etc)
|
|
|
|
|
|
The end result of all this is:
|
|
* When running python.exe, or any other .exe in the main Python directory
|
|
(either an installed version, or directly from the PCbuild directory),
|
|
the core path is deduced, and the core paths in the registry are
|
|
ignored. Other "application paths" in the registry are always read.
|
|
|
|
* When Python is hosted in another exe (different directory, embedded via
|
|
COM, etc), the Python Home will not be deduced, so the core path from
|
|
the registry is used. Other "application paths "in the registry are
|
|
always read.
|
|
|
|
* If Python can't find its home and there is no registry (eg, frozen
|
|
exe, some very strange installation setup) you get a path with
|
|
some default, but relative, paths.
|
|
|
|
---------------------------------------------------------------- */
|
|
|
|
|
|
#include "Python.h"
|
|
#include "osdefs.h"
|
|
|
|
#ifdef MS_WIN32
|
|
#include <windows.h>
|
|
#include <tchar.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif /* HAVE_UNISTD_H */
|
|
|
|
/* Search in some common locations for the associated Python libraries.
|
|
*
|
|
* Py_GetPath() tries to return a sensible Python module search path.
|
|
*
|
|
* The approach is an adaptation for Windows of the strategy used in
|
|
* ../Modules/getpath.c; it uses the Windows Registry as one of its
|
|
* information sources.
|
|
*/
|
|
|
|
#ifndef LANDMARK
|
|
#define LANDMARK "lib\\os.py"
|
|
#endif
|
|
|
|
static char prefix[MAXPATHLEN+1];
|
|
static char progpath[MAXPATHLEN+1];
|
|
static char *module_search_path = NULL;
|
|
|
|
|
|
static int
|
|
is_sep(ch) /* determine if "ch" is a separator character */
|
|
char ch;
|
|
{
|
|
#ifdef ALTSEP
|
|
return ch == SEP || ch == ALTSEP;
|
|
#else
|
|
return ch == SEP;
|
|
#endif
|
|
}
|
|
|
|
|
|
static void
|
|
reduce(dir)
|
|
char *dir;
|
|
{
|
|
size_t i = strlen(dir);
|
|
while (i > 0 && !is_sep(dir[i]))
|
|
--i;
|
|
dir[i] = '\0';
|
|
}
|
|
|
|
|
|
static int
|
|
exists(filename)
|
|
char *filename;
|
|
{
|
|
struct stat buf;
|
|
return stat(filename, &buf) == 0;
|
|
}
|
|
|
|
|
|
static int
|
|
ismodule(filename) /* Is module -- check for .pyc/.pyo too */
|
|
char *filename;
|
|
{
|
|
if (exists(filename))
|
|
return 1;
|
|
|
|
/* Check for the compiled version of prefix. */
|
|
if (strlen(filename) < MAXPATHLEN) {
|
|
strcat(filename, Py_OptimizeFlag ? "o" : "c");
|
|
if (exists(filename))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
join(buffer, stuff)
|
|
char *buffer;
|
|
char *stuff;
|
|
{
|
|
size_t n, k;
|
|
if (is_sep(stuff[0]))
|
|
n = 0;
|
|
else {
|
|
n = strlen(buffer);
|
|
if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN)
|
|
buffer[n++] = SEP;
|
|
}
|
|
k = strlen(stuff);
|
|
if (n + k > MAXPATHLEN)
|
|
k = MAXPATHLEN - n;
|
|
strncpy(buffer+n, stuff, k);
|
|
buffer[n+k] = '\0';
|
|
}
|
|
|
|
|
|
static int
|
|
gotlandmark(landmark)
|
|
char *landmark;
|
|
{
|
|
int n, ok;
|
|
|
|
n = strlen(prefix);
|
|
join(prefix, landmark);
|
|
ok = ismodule(prefix);
|
|
prefix[n] = '\0';
|
|
return ok;
|
|
}
|
|
|
|
|
|
static int
|
|
search_for_prefix(argv0_path, landmark)
|
|
char *argv0_path;
|
|
char *landmark;
|
|
{
|
|
/* Search from argv0_path, until landmark is found */
|
|
strcpy(prefix, argv0_path);
|
|
do {
|
|
if (gotlandmark(landmark))
|
|
return 1;
|
|
reduce(prefix);
|
|
} while (prefix[0]);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef MS_WIN32
|
|
|
|
/* a string loaded from the DLL at startup.*/
|
|
extern const char *PyWin_DLLVersionString;
|
|
|
|
|
|
/* Load a PYTHONPATH value from the registry.
|
|
Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.
|
|
|
|
Works in both Unicode and 8bit environments. Only uses the
|
|
Ex family of functions so it also works with Windows CE.
|
|
|
|
Returns NULL, or a pointer that should be freed.
|
|
*/
|
|
|
|
static char *
|
|
getpythonregpath(HKEY keyBase, int skipcore)
|
|
{
|
|
HKEY newKey = 0;
|
|
DWORD dataSize = 0;
|
|
DWORD numKeys = 0;
|
|
LONG rc;
|
|
char *retval = NULL;
|
|
TCHAR *dataBuf = NULL;
|
|
static const TCHAR keyPrefix[] = _T("Software\\Python\\PythonCore\\");
|
|
static const TCHAR keySuffix[] = _T("\\PythonPath");
|
|
size_t versionLen;
|
|
DWORD index;
|
|
TCHAR *keyBuf = NULL;
|
|
TCHAR *keyBufPtr;
|
|
TCHAR **ppPaths = NULL;
|
|
|
|
/* Tried to use sysget("winver") but here is too early :-( */
|
|
versionLen = _tcslen(PyWin_DLLVersionString);
|
|
/* Space for all the chars, plus one \0 */
|
|
keyBuf = keyBufPtr = malloc(sizeof(keyPrefix) +
|
|
sizeof(TCHAR)*(versionLen-1) +
|
|
sizeof(keySuffix));
|
|
if (keyBuf==NULL) goto done;
|
|
|
|
memcpy(keyBufPtr, keyPrefix, sizeof(keyPrefix)-sizeof(TCHAR));
|
|
keyBufPtr += sizeof(keyPrefix)/sizeof(TCHAR) - 1;
|
|
memcpy(keyBufPtr, PyWin_DLLVersionString, versionLen * sizeof(TCHAR));
|
|
keyBufPtr += versionLen;
|
|
/* NULL comes with this one! */
|
|
memcpy(keyBufPtr, keySuffix, sizeof(keySuffix));
|
|
/* Open the root Python key */
|
|
rc=RegOpenKeyEx(keyBase,
|
|
keyBuf, /* subkey */
|
|
0, /* reserved */
|
|
KEY_READ,
|
|
&newKey);
|
|
if (rc!=ERROR_SUCCESS) goto done;
|
|
/* Find out how big our core buffer is, and how many subkeys we have */
|
|
rc = RegQueryInfoKey(newKey, NULL, NULL, NULL, &numKeys, NULL, NULL,
|
|
NULL, NULL, &dataSize, NULL, NULL);
|
|
if (rc!=ERROR_SUCCESS) goto done;
|
|
if (skipcore) dataSize = 0; /* Only count core ones if we want them! */
|
|
/* Allocate a temp array of char buffers, so we only need to loop
|
|
reading the registry once
|
|
*/
|
|
ppPaths = malloc( sizeof(TCHAR *) * numKeys );
|
|
if (ppPaths==NULL) goto done;
|
|
memset(ppPaths, 0, sizeof(TCHAR *) * numKeys);
|
|
/* Loop over all subkeys, allocating a temp sub-buffer. */
|
|
for(index=0;index<numKeys;index++) {
|
|
TCHAR keyBuf[MAX_PATH+1];
|
|
HKEY subKey = 0;
|
|
DWORD reqdSize = MAX_PATH+1;
|
|
/* Get the sub-key name */
|
|
DWORD rc = RegEnumKeyEx(newKey, index, keyBuf, &reqdSize,
|
|
NULL, NULL, NULL, NULL );
|
|
if (rc!=ERROR_SUCCESS) goto done;
|
|
/* Open the sub-key */
|
|
rc=RegOpenKeyEx(newKey,
|
|
keyBuf, /* subkey */
|
|
0, /* reserved */
|
|
KEY_READ,
|
|
&subKey);
|
|
if (rc!=ERROR_SUCCESS) goto done;
|
|
/* Find the value of the buffer size, malloc, then read it */
|
|
RegQueryValueEx(subKey, NULL, 0, NULL, NULL, &reqdSize);
|
|
if (reqdSize) {
|
|
ppPaths[index] = malloc(reqdSize);
|
|
if (ppPaths[index]) {
|
|
RegQueryValueEx(subKey, NULL, 0, NULL, (LPBYTE)ppPaths[index], &reqdSize);
|
|
dataSize += reqdSize + 1; /* 1 for the ";" */
|
|
}
|
|
}
|
|
RegCloseKey(subKey);
|
|
}
|
|
dataBuf = malloc((dataSize+1) * sizeof(TCHAR));
|
|
if (dataBuf) {
|
|
TCHAR *szCur = dataBuf;
|
|
DWORD reqdSize = dataSize;
|
|
/* Copy our collected strings */
|
|
for (index=0;index<numKeys;index++) {
|
|
int len;
|
|
if (index > 0) {
|
|
*(szCur++) = _T(';');
|
|
dataSize--;
|
|
}
|
|
len = _tcslen(ppPaths[index]);
|
|
_tcsncpy(szCur, ppPaths[index], len);
|
|
szCur += len;
|
|
dataSize -= len;
|
|
}
|
|
if (skipcore)
|
|
*szCur = '\0';
|
|
else {
|
|
*(szCur++) = _T(';');
|
|
dataSize--;
|
|
/* Now append the core path entries - this will include the NULL */
|
|
rc = RegQueryValueEx(newKey, NULL, 0, NULL, (LPBYTE)szCur, &dataSize);
|
|
}
|
|
/* And set the result - caller must free
|
|
If MBCS, it is fine as is. If Unicode, allocate new
|
|
buffer and convert.
|
|
*/
|
|
#ifdef UNICODE
|
|
retval = (char *)malloc(reqdSize+1);
|
|
if (retval)
|
|
WideCharToMultiByte(CP_ACP, 0,
|
|
dataBuf, -1, /* source */
|
|
retval, dataSize+1, /* dest */
|
|
NULL, NULL);
|
|
free(dataBuf);
|
|
#else
|
|
retval = dataBuf;
|
|
#endif
|
|
}
|
|
done:
|
|
/* Loop freeing my temp buffers */
|
|
if (ppPaths) {
|
|
for(index=0;index<numKeys;index++)
|
|
if (ppPaths[index]) free(ppPaths[index]);
|
|
free(ppPaths);
|
|
}
|
|
if (newKey)
|
|
RegCloseKey(newKey);
|
|
if (keyBuf)
|
|
free(keyBuf);
|
|
return retval;
|
|
}
|
|
#endif /* MS_WIN32 */
|
|
|
|
static void
|
|
get_progpath()
|
|
{
|
|
extern char *Py_GetProgramName();
|
|
char *path = getenv("PATH");
|
|
char *prog = Py_GetProgramName();
|
|
|
|
#ifdef MS_WIN32
|
|
#ifdef UNICODE
|
|
WCHAR wprogpath[MAXPATHLEN+1];
|
|
if (GetModuleFileName(NULL, wprogpath, MAXPATHLEN)) {
|
|
WideCharToMultiByte(CP_ACP, 0, wprogpath, -1, progpath, MAXPATHLEN+1, NULL, NULL);
|
|
return;
|
|
}
|
|
#else
|
|
if (GetModuleFileName(NULL, progpath, MAXPATHLEN))
|
|
return;
|
|
#endif
|
|
#endif
|
|
if (prog == NULL || *prog == '\0')
|
|
prog = "python";
|
|
|
|
/* If there is no slash in the argv0 path, then we have to
|
|
* assume python is on the user's $PATH, since there's no
|
|
* other way to find a directory to start the search from. If
|
|
* $PATH isn't exported, you lose.
|
|
*/
|
|
#ifdef ALTSEP
|
|
if (strchr(prog, SEP) || strchr(prog, ALTSEP))
|
|
#else
|
|
if (strchr(prog, SEP))
|
|
#endif
|
|
strcpy(progpath, prog);
|
|
else if (path) {
|
|
while (1) {
|
|
char *delim = strchr(path, DELIM);
|
|
|
|
if (delim) {
|
|
size_t len = delim - path;
|
|
strncpy(progpath, path, len);
|
|
*(progpath + len) = '\0';
|
|
}
|
|
else
|
|
strcpy(progpath, path);
|
|
|
|
join(progpath, prog);
|
|
if (exists(progpath))
|
|
break;
|
|
|
|
if (!delim) {
|
|
progpath[0] = '\0';
|
|
break;
|
|
}
|
|
path = delim + 1;
|
|
}
|
|
}
|
|
else
|
|
progpath[0] = '\0';
|
|
}
|
|
|
|
static void
|
|
calculate_path()
|
|
{
|
|
char argv0_path[MAXPATHLEN+1];
|
|
char *buf;
|
|
size_t bufsz;
|
|
char *pythonhome = Py_GetPythonHome();
|
|
char *envpath = getenv("PYTHONPATH");
|
|
|
|
#ifdef MS_WIN32
|
|
int skiphome, skipdefault;
|
|
char *machinepath = NULL;
|
|
char *userpath = NULL;
|
|
#endif
|
|
|
|
get_progpath();
|
|
strcpy(argv0_path, progpath);
|
|
reduce(argv0_path);
|
|
if (pythonhome == NULL || *pythonhome == '\0') {
|
|
if (search_for_prefix(argv0_path, LANDMARK))
|
|
pythonhome = prefix;
|
|
else
|
|
pythonhome = NULL;
|
|
}
|
|
else
|
|
strcpy(prefix, pythonhome);
|
|
|
|
if (envpath && *envpath == '\0')
|
|
envpath = NULL;
|
|
|
|
|
|
#ifdef MS_WIN32
|
|
skiphome = pythonhome==NULL ? 0 : 1;
|
|
machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, skiphome);
|
|
userpath = getpythonregpath(HKEY_CURRENT_USER, skiphome);
|
|
/* We only use the default relative PYTHONPATH if we havent
|
|
anything better to use! */
|
|
skipdefault = envpath!=NULL || pythonhome!=NULL || \
|
|
machinepath!=NULL || userpath!=NULL;
|
|
#endif
|
|
|
|
/* We need to construct a path from the following parts.
|
|
(1) the PYTHONPATH environment variable, if set;
|
|
(2) for Win32, the machinepath and userpath, if set;
|
|
(3) the PYTHONPATH config macro, with the leading "."
|
|
of each component replaced with pythonhome, if set;
|
|
(4) the directory containing the executable (argv0_path).
|
|
The length calculation calculates #3 first.
|
|
Extra rules:
|
|
- If PYTHONHOME is set (in any way) item (2) is ignored.
|
|
- If registry values are used, (3) and (4) are ignored.
|
|
*/
|
|
|
|
/* Calculate size of return buffer */
|
|
if (pythonhome != NULL) {
|
|
char *p;
|
|
bufsz = 1;
|
|
for (p = PYTHONPATH; *p; p++) {
|
|
if (*p == DELIM)
|
|
bufsz++; /* number of DELIM plus one */
|
|
}
|
|
bufsz *= strlen(pythonhome);
|
|
}
|
|
else
|
|
bufsz = 0;
|
|
bufsz += strlen(PYTHONPATH) + 1;
|
|
bufsz += strlen(argv0_path) + 1;
|
|
#ifdef MS_WIN32
|
|
if (userpath)
|
|
bufsz += strlen(userpath) + 1;
|
|
if (machinepath)
|
|
bufsz += strlen(machinepath) + 1;
|
|
#endif
|
|
if (envpath != NULL)
|
|
bufsz += strlen(envpath) + 1;
|
|
|
|
module_search_path = buf = malloc(bufsz);
|
|
if (buf == NULL) {
|
|
/* We can't exit, so print a warning and limp along */
|
|
fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n");
|
|
if (envpath) {
|
|
fprintf(stderr, "Using environment $PYTHONPATH.\n");
|
|
module_search_path = envpath;
|
|
}
|
|
else {
|
|
fprintf(stderr, "Using default static path.\n");
|
|
module_search_path = PYTHONPATH;
|
|
}
|
|
#ifdef MS_WIN32
|
|
if (machinepath)
|
|
free(machinepath);
|
|
if (userpath)
|
|
free(userpath);
|
|
#endif /* MS_WIN32 */
|
|
return;
|
|
}
|
|
|
|
if (envpath) {
|
|
strcpy(buf, envpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
#ifdef MS_WIN32
|
|
if (userpath) {
|
|
strcpy(buf, userpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
free(userpath);
|
|
}
|
|
if (machinepath) {
|
|
strcpy(buf, machinepath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
free(machinepath);
|
|
}
|
|
if (pythonhome == NULL) {
|
|
if (!skipdefault) {
|
|
strcpy(buf, PYTHONPATH);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
}
|
|
#else
|
|
if (pythonhome == NULL) {
|
|
strcpy(buf, PYTHONPATH);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
#endif /* MS_WIN32 */
|
|
else {
|
|
char *p = PYTHONPATH;
|
|
char *q;
|
|
size_t n;
|
|
for (;;) {
|
|
q = strchr(p, DELIM);
|
|
if (q == NULL)
|
|
n = strlen(p);
|
|
else
|
|
n = q-p;
|
|
if (p[0] == '.' && is_sep(p[1])) {
|
|
strcpy(buf, pythonhome);
|
|
buf = strchr(buf, '\0');
|
|
p++;
|
|
n--;
|
|
}
|
|
strncpy(buf, p, n);
|
|
buf += n;
|
|
if (q == NULL)
|
|
break;
|
|
*buf++ = DELIM;
|
|
p = q+1;
|
|
}
|
|
}
|
|
if (argv0_path) {
|
|
*buf++ = DELIM;
|
|
strcpy(buf, argv0_path);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
*buf = '\0';
|
|
}
|
|
|
|
|
|
/* External interface */
|
|
|
|
char *
|
|
Py_GetPath()
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return module_search_path;
|
|
}
|
|
|
|
char *
|
|
Py_GetPrefix()
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return prefix;
|
|
}
|
|
|
|
char *
|
|
Py_GetExecPrefix()
|
|
{
|
|
return Py_GetPrefix();
|
|
}
|
|
|
|
char *
|
|
Py_GetProgramFullPath()
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return progpath;
|
|
}
|