mirror of
https://github.com/python/cpython.git
synced 2024-11-25 19:03:49 +08:00
eea1449a34
is now obsolete), and changed the default path calculations. $PYTHONPATH is now added as a prefix (like it's always been on Unix); $PYTHONHOME takes precedence over the program pathname; and only one landmark is needed.
469 lines
10 KiB
C
469 lines
10 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. Works on NT too. */
|
|
|
|
#include "Python.h"
|
|
#include "osdefs.h"
|
|
|
|
#ifdef MS_WIN32
|
|
#include <windows.h>
|
|
extern BOOL PyWin_IsWin32s();
|
|
#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.
|
|
*
|
|
* This version always returns "" for both prefix and exec_prefix.
|
|
*
|
|
* Py_GetPath() tries to return a sensible Python module search path.
|
|
*
|
|
* First, we look to see if the executable is in a subdirectory of
|
|
* the Python build directory. We calculate the full path of the
|
|
* directory containing the executable as progpath. We work backwards
|
|
* along progpath and look for $dir/Modules/Setup.in, a distinctive
|
|
* landmark. If found, we use $dir/Lib as $root. The returned
|
|
* Python path is the compiled #define PYTHONPATH with all the initial
|
|
* "./lib" replaced by $root.
|
|
*
|
|
* Otherwise, if there is a PYTHONPATH environment variable, we return that.
|
|
*
|
|
* Otherwise we try to find $progpath/lib/string.py, and if found, then
|
|
* root is $progpath/lib, and we return Python path as compiled PYTHONPATH
|
|
* with all "./lib" replaced by $root (as above).
|
|
*
|
|
*/
|
|
|
|
#ifndef LANDMARK
|
|
#define LANDMARK "lib\\string.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;
|
|
{
|
|
int 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 void
|
|
join(buffer, stuff)
|
|
char *buffer;
|
|
char *stuff;
|
|
{
|
|
int 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
|
|
search_for_prefix(argv0_path, landmark)
|
|
char *argv0_path;
|
|
char *landmark;
|
|
{
|
|
int n;
|
|
|
|
/* Search from argv0_path, until root is found */
|
|
strcpy(prefix, argv0_path);
|
|
do {
|
|
n = strlen(prefix);
|
|
join(prefix, landmark);
|
|
if (exists(prefix)) {
|
|
prefix[n] = '\0';
|
|
return 1;
|
|
}
|
|
prefix[n] = '\0';
|
|
reduce(prefix);
|
|
} while (prefix[0]);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef MS_WIN32
|
|
|
|
/* Load a PYTHONPATH value from the registry.
|
|
Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.
|
|
|
|
Returns NULL, or a pointer that should be freed.
|
|
*/
|
|
|
|
static char *
|
|
getpythonregpath(HKEY keyBase, BOOL bWin32s)
|
|
{
|
|
HKEY newKey = 0;
|
|
DWORD nameSize = 0;
|
|
DWORD dataSize = 0;
|
|
DWORD numEntries = 0;
|
|
LONG rc;
|
|
char *retval = NULL;
|
|
char *dataBuf;
|
|
rc=RegOpenKey(keyBase,
|
|
"Software\\Python\\PythonCore\\"
|
|
MS_DLL_ID "\\PythonPath",
|
|
&newKey);
|
|
if (rc==ERROR_SUCCESS) {
|
|
RegQueryInfoKey(newKey, NULL, NULL, NULL, NULL, NULL, NULL,
|
|
&numEntries, &nameSize, &dataSize, NULL, NULL);
|
|
}
|
|
if (bWin32s && numEntries==0 && dataSize==0) {
|
|
/* must hardcode for Win32s */
|
|
numEntries = 1;
|
|
dataSize = 511;
|
|
}
|
|
if (numEntries) {
|
|
/* Loop over all subkeys. */
|
|
/* Win32s doesnt know how many subkeys, so we do
|
|
it twice */
|
|
char keyBuf[MAX_PATH+1];
|
|
int index = 0;
|
|
int off = 0;
|
|
for(index=0;;index++) {
|
|
long reqdSize = 0;
|
|
DWORD rc = RegEnumKey(newKey,
|
|
index, keyBuf, MAX_PATH+1);
|
|
if (rc) break;
|
|
rc = RegQueryValue(newKey, keyBuf, NULL, &reqdSize);
|
|
if (rc) break;
|
|
if (bWin32s && reqdSize==0) reqdSize = 512;
|
|
dataSize += reqdSize + 1; /* 1 for the ";" */
|
|
}
|
|
dataBuf = malloc(dataSize+1);
|
|
if (dataBuf==NULL)
|
|
return NULL; /* pretty serious? Raise error? */
|
|
/* Now loop over, grabbing the paths.
|
|
Subkeys before main library */
|
|
for(index=0;;index++) {
|
|
int adjust;
|
|
long reqdSize = dataSize;
|
|
DWORD rc = RegEnumKey(newKey,
|
|
index, keyBuf,MAX_PATH+1);
|
|
if (rc) break;
|
|
rc = RegQueryValue(newKey,
|
|
keyBuf, dataBuf+off, &reqdSize);
|
|
if (rc) break;
|
|
if (reqdSize>1) {
|
|
/* If Nothing, or only '\0' copied. */
|
|
adjust = strlen(dataBuf+off);
|
|
dataSize -= adjust;
|
|
off += adjust;
|
|
dataBuf[off++] = ';';
|
|
dataBuf[off] = '\0';
|
|
dataSize--;
|
|
}
|
|
}
|
|
/* Additionally, win32s doesnt work as expected, so
|
|
the specific strlen() is required for 3.1. */
|
|
rc = RegQueryValue(newKey, "", dataBuf+off, &dataSize);
|
|
if (rc==ERROR_SUCCESS) {
|
|
if (strlen(dataBuf)==0)
|
|
free(dataBuf);
|
|
else
|
|
retval = dataBuf; /* caller will free */
|
|
}
|
|
else
|
|
free(dataBuf);
|
|
}
|
|
|
|
if (newKey)
|
|
RegCloseKey(newKey);
|
|
return retval;
|
|
}
|
|
#endif /* MS_WIN32 */
|
|
|
|
static void
|
|
get_progpath()
|
|
{
|
|
extern char *Py_GetProgramName();
|
|
char *path = getenv("PATH");
|
|
char *prog = Py_GetProgramName();
|
|
|
|
#ifdef MS_WIN32
|
|
if (GetModuleFileName(NULL, progpath, MAXPATHLEN))
|
|
return;
|
|
#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) {
|
|
int 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;
|
|
int bufsz;
|
|
char *pythonhome = getenv("PYTHONHOME");
|
|
char *envpath = getenv("PYTHONPATH");
|
|
#ifdef MS_WIN32
|
|
char *machinepath, *userpath;
|
|
|
|
/* Are we running under Windows 3.1(1) Win32s? */
|
|
if (PyWin_IsWin32s()) {
|
|
/* Only CLASSES_ROOT is supported */
|
|
machinepath = getpythonregpath(HKEY_CLASSES_ROOT, TRUE);
|
|
userpath = NULL;
|
|
} else {
|
|
machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, FALSE);
|
|
userpath = getpythonregpath(HKEY_CURRENT_USER, FALSE);
|
|
}
|
|
#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;
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/* 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);
|
|
if (envpath != NULL)
|
|
bufsz += strlen(envpath) + 1;
|
|
bufsz += strlen(argv0_path) + 1;
|
|
#ifdef MS_WIN32
|
|
if (machinepath)
|
|
bufsz += strlen(machinepath) + 1;
|
|
if (userpath)
|
|
bufsz += strlen(userpath) + 1;
|
|
#endif
|
|
|
|
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 default static $PYTHONPATH.\n");
|
|
module_search_path = envpath;
|
|
}
|
|
else {
|
|
fprintf(stderr, "Using environment $PYTHONPATH.\n");
|
|
module_search_path = PYTHONPATH;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (envpath) {
|
|
strcpy(buf, envpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
#ifdef MS_WIN32
|
|
if (machinepath) {
|
|
strcpy(buf, machinepath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
if (userpath) {
|
|
strcpy(buf, userpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
#endif
|
|
if (pythonhome == NULL) {
|
|
strcpy(buf, PYTHONPATH);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
else {
|
|
char *p = PYTHONPATH;
|
|
char *q;
|
|
int 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;
|
|
}
|