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1614 lines (1362 loc) · 44.8 KB
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/* Return the initial module search path. */
#include "Python.h"
#include "pycore_fileutils.h"
#include "pycore_initconfig.h"
#include "pycore_pathconfig.h"
#include "osdefs.h" // DELIM
#include <sys/types.h>
#include <string.h>
#ifdef __APPLE__
# include <mach-o/dyld.h>
#endif
/* Search in some common locations for the associated Python libraries.
*
* Two directories must be found, the platform independent directory
* (prefix), containing the common .py and .pyc files, and the platform
* dependent directory (exec_prefix), containing the shared library
* modules. Note that prefix and exec_prefix can be the same directory,
* but for some installations, they are different.
*
* Py_GetPath() carries out separate searches for prefix and exec_prefix.
* Each search tries a number of different locations until a ``landmark''
* file or directory is found. If no prefix or exec_prefix is found, a
* warning message is issued and the preprocessor defined PREFIX and
* EXEC_PREFIX are used (even though they will not work); python carries on
* as best as is possible, but most imports will fail.
*
* Before any searches are done, the location of the executable is
* determined. If argv[0] has one or more slashes in it, it is used
* unchanged. Otherwise, it must have been invoked from the shell's path,
* so we search $PATH for the named executable and use that. If the
* executable was not found on $PATH (or there was no $PATH environment
* variable), the original argv[0] string is used.
*
* Next, the executable location is examined to see if it is a symbolic
* link. If so, the link is chased (correctly interpreting a relative
* pathname if one is found) and the directory of the link target is used.
*
* Finally, argv0_path is set to the directory containing the executable
* (i.e. the last component is stripped).
*
* With argv0_path in hand, we perform a number of steps. The same steps
* are performed for prefix and for exec_prefix, but with a different
* landmark.
*
* Step 1. Are we running python out of the build directory? This is
* checked by looking for a different kind of landmark relative to
* argv0_path. For prefix, the landmark's path is derived from the VPATH
* preprocessor variable (taking into account that its value is almost, but
* not quite, what we need). For exec_prefix, the landmark is
* pybuilddir.txt. If the landmark is found, we're done.
*
* For the remaining steps, the prefix landmark will always be
* lib/python$VERSION/os.py and the exec_prefix will always be
* lib/python$VERSION/lib-dynload, where $VERSION is Python's version
* number as supplied by the Makefile. Note that this means that no more
* build directory checking is performed; if the first step did not find
* the landmarks, the assumption is that python is running from an
* installed setup.
*
* Step 2. See if the $PYTHONHOME environment variable points to the
* installed location of the Python libraries. If $PYTHONHOME is set, then
* it points to prefix and exec_prefix. $PYTHONHOME can be a single
* directory, which is used for both, or the prefix and exec_prefix
* directories separated by a colon.
*
* Step 3. Try to find prefix and exec_prefix relative to argv0_path,
* backtracking up the path until it is exhausted. This is the most common
* step to succeed. Note that if prefix and exec_prefix are different,
* exec_prefix is more likely to be found; however if exec_prefix is a
* subdirectory of prefix, both will be found.
*
* Step 4. Search the directories pointed to by the preprocessor variables
* PREFIX and EXEC_PREFIX. These are supplied by the Makefile but can be
* passed in as options to the configure script.
*
* That's it!
*
* Well, almost. Once we have determined prefix and exec_prefix, the
* preprocessor variable PYTHONPATH is used to construct a path. Each
* relative path on PYTHONPATH is prefixed with prefix. Then the directory
* containing the shared library modules is appended. The environment
* variable $PYTHONPATH is inserted in front of it all. Finally, the
* prefix and exec_prefix globals are tweaked so they reflect the values
* expected by other code, by stripping the "lib/python$VERSION/..." stuff
* off. If either points to the build directory, the globals are reset to
* the corresponding preprocessor variables (so sys.prefix will reflect the
* installation location, even though sys.path points into the build
* directory). This seems to make more sense given that currently the only
* known use of sys.prefix and sys.exec_prefix is for the ILU installation
* process to find the installed Python tree.
*
* An embedding application can use Py_SetPath() to override all of
* these automatic path computations.
*
* NOTE: Windows MSVC builds use PC/getpathp.c instead!
*/
#ifdef __cplusplus
extern "C" {
#endif
#if (!defined(PREFIX) || !defined(EXEC_PREFIX) \
|| !defined(VERSION) || !defined(VPATH))
#error "PREFIX, EXEC_PREFIX, VERSION and VPATH macros must be defined"
#endif
#ifndef LANDMARK
#define LANDMARK L"os.py"
#endif
#define BUILD_LANDMARK L"Modules/Setup.local"
#define DECODE_LOCALE_ERR(NAME, LEN) \
((LEN) == (size_t)-2) \
? _PyStatus_ERR("cannot decode " NAME) \
: _PyStatus_NO_MEMORY()
#define PATHLEN_ERR() _PyStatus_ERR("path configuration: path too long")
typedef struct {
wchar_t *path_env; /* PATH environment variable */
wchar_t *pythonpath_macro; /* PYTHONPATH macro */
wchar_t *prefix_macro; /* PREFIX macro */
wchar_t *exec_prefix_macro; /* EXEC_PREFIX macro */
wchar_t *vpath_macro; /* VPATH macro */
wchar_t *lib_python; /* "lib/pythonX.Y" */
int prefix_found; /* found platform independent libraries? */
int exec_prefix_found; /* found the platform dependent libraries? */
int warnings;
const wchar_t *pythonpath_env;
const wchar_t *platlibdir;
wchar_t *argv0_path;
wchar_t *zip_path;
wchar_t *prefix;
wchar_t *exec_prefix;
} PyCalculatePath;
static const wchar_t delimiter[2] = {DELIM, '\0'};
static const wchar_t separator[2] = {SEP, '\0'};
/* Get file status. Encode the path to the locale encoding. */
static int
_Py_wstat(const wchar_t* path, struct stat *buf)
{
int err;
char *fname;
fname = _Py_EncodeLocaleRaw(path, NULL);
if (fname == NULL) {
errno = EINVAL;
return -1;
}
err = stat(fname, buf);
PyMem_RawFree(fname);
return err;
}
static void
reduce(wchar_t *dir)
{
size_t i = wcslen(dir);
while (i > 0 && dir[i] != SEP) {
--i;
}
dir[i] = '\0';
}
/* Is file, not directory */
static int
isfile(const wchar_t *filename)
{
struct stat buf;
if (_Py_wstat(filename, &buf) != 0) {
return 0;
}
if (!S_ISREG(buf.st_mode)) {
return 0;
}
return 1;
}
/* Is executable file */
static int
isxfile(const wchar_t *filename)
{
struct stat buf;
if (_Py_wstat(filename, &buf) != 0) {
return 0;
}
if (!S_ISREG(buf.st_mode)) {
return 0;
}
if ((buf.st_mode & 0111) == 0) {
return 0;
}
return 1;
}
/* Is directory */
static int
isdir(const wchar_t *filename)
{
struct stat buf;
if (_Py_wstat(filename, &buf) != 0) {
return 0;
}
if (!S_ISDIR(buf.st_mode)) {
return 0;
}
return 1;
}
/* Add a path component, by appending stuff to buffer.
buflen: 'buffer' length in characters including trailing NUL.
If path2 is empty:
- if path doesn't end with SEP and is not empty, add SEP to path
- otherwise, do nothing. */
static PyStatus
joinpath(wchar_t *path, const wchar_t *path2, size_t path_len)
{
size_t n;
if (!_Py_isabs(path2)) {
n = wcslen(path);
if (n >= path_len) {
return PATHLEN_ERR();
}
if (n > 0 && path[n-1] != SEP) {
path[n++] = SEP;
}
}
else {
n = 0;
}
size_t k = wcslen(path2);
if (n + k >= path_len) {
return PATHLEN_ERR();
}
wcsncpy(path + n, path2, k);
path[n + k] = '\0';
return _PyStatus_OK();
}
static wchar_t*
substring(const wchar_t *str, size_t len)
{
wchar_t *substr = PyMem_RawMalloc((len + 1) * sizeof(wchar_t));
if (substr == NULL) {
return NULL;
}
if (len) {
memcpy(substr, str, len * sizeof(wchar_t));
}
substr[len] = L'\0';
return substr;
}
static wchar_t*
joinpath2(const wchar_t *path, const wchar_t *path2)
{
if (_Py_isabs(path2)) {
return _PyMem_RawWcsdup(path2);
}
size_t len = wcslen(path);
int add_sep = (len > 0 && path[len - 1] != SEP);
len += add_sep;
len += wcslen(path2);
wchar_t *new_path = PyMem_RawMalloc((len + 1) * sizeof(wchar_t));
if (new_path == NULL) {
return NULL;
}
wcscpy(new_path, path);
if (add_sep) {
wcscat(new_path, separator);
}
wcscat(new_path, path2);
return new_path;
}
static inline int
safe_wcscpy(wchar_t *dst, const wchar_t *src, size_t n)
{
size_t srclen = wcslen(src);
if (n <= srclen) {
dst[0] = L'\0';
return -1;
}
memcpy(dst, src, (srclen + 1) * sizeof(wchar_t));
return 0;
}
/* copy_absolute requires that path be allocated at least
'abs_path_len' characters (including trailing NUL). */
static PyStatus
copy_absolute(wchar_t *abs_path, const wchar_t *path, size_t abs_path_len)
{
if (_Py_isabs(path)) {
if (safe_wcscpy(abs_path, path, abs_path_len) < 0) {
return PATHLEN_ERR();
}
}
else {
if (!_Py_wgetcwd(abs_path, abs_path_len)) {
/* unable to get the current directory */
if (safe_wcscpy(abs_path, path, abs_path_len) < 0) {
return PATHLEN_ERR();
}
return _PyStatus_OK();
}
if (path[0] == '.' && path[1] == SEP) {
path += 2;
}
PyStatus status = joinpath(abs_path, path, abs_path_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
}
return _PyStatus_OK();
}
/* path_len: path length in characters including trailing NUL */
static PyStatus
absolutize(wchar_t **path_p)
{
assert(!_Py_isabs(*path_p));
wchar_t abs_path[MAXPATHLEN+1];
wchar_t *path = *path_p;
PyStatus status = copy_absolute(abs_path, path, Py_ARRAY_LENGTH(abs_path));
if (_PyStatus_EXCEPTION(status)) {
return status;
}
PyMem_RawFree(*path_p);
*path_p = _PyMem_RawWcsdup(abs_path);
if (*path_p == NULL) {
return _PyStatus_NO_MEMORY();
}
return _PyStatus_OK();
}
/* Is module -- check for .pyc too */
static PyStatus
ismodule(const wchar_t *path, int *result)
{
wchar_t *filename = joinpath2(path, LANDMARK);
if (filename == NULL) {
return _PyStatus_NO_MEMORY();
}
if (isfile(filename)) {
PyMem_RawFree(filename);
*result = 1;
return _PyStatus_OK();
}
/* Check for the compiled version of prefix. */
size_t len = wcslen(filename);
wchar_t *pyc = PyMem_RawMalloc((len + 2) * sizeof(wchar_t));
if (pyc == NULL) {
PyMem_RawFree(filename);
return _PyStatus_NO_MEMORY();
}
memcpy(pyc, filename, len * sizeof(wchar_t));
pyc[len] = L'c';
pyc[len + 1] = L'\0';
*result = isfile(pyc);
PyMem_RawFree(filename);
PyMem_RawFree(pyc);
return _PyStatus_OK();
}
#if defined(__CYGWIN__) || defined(__MINGW32__)
#ifndef EXE_SUFFIX
#define EXE_SUFFIX L".exe"
#endif
/* pathlen: 'path' length in characters including trailing NUL */
static PyStatus
add_exe_suffix(wchar_t **progpath_p)
{
wchar_t *progpath = *progpath_p;
/* Check for already have an executable suffix */
size_t n = wcslen(progpath);
size_t s = wcslen(EXE_SUFFIX);
if (wcsncasecmp(EXE_SUFFIX, progpath + n - s, s) == 0) {
return _PyStatus_OK();
}
wchar_t *progpath2 = PyMem_RawMalloc((n + s + 1) * sizeof(wchar_t));
if (progpath2 == NULL) {
return _PyStatus_NO_MEMORY();
}
memcpy(progpath2, progpath, n * sizeof(wchar_t));
memcpy(progpath2 + n, EXE_SUFFIX, s * sizeof(wchar_t));
progpath2[n+s] = L'\0';
if (isxfile(progpath2)) {
PyMem_RawFree(*progpath_p);
*progpath_p = progpath2;
}
else {
PyMem_RawFree(progpath2);
}
return _PyStatus_OK();
}
#endif
/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
bytes long.
*/
static PyStatus
search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig,
wchar_t *prefix, size_t prefix_len, int *found)
{
PyStatus status;
/* If PYTHONHOME is set, we believe it unconditionally */
if (pathconfig->home) {
/* Path: <home> / <lib_python> */
if (safe_wcscpy(prefix, pathconfig->home, prefix_len) < 0) {
return PATHLEN_ERR();
}
wchar_t *delim = wcschr(prefix, DELIM);
if (delim) {
*delim = L'\0';
}
status = joinpath(prefix, calculate->lib_python, prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
*found = 1;
return _PyStatus_OK();
}
/* Check to see if argv0_path is in the build directory
Path: <argv0_path> / <BUILD_LANDMARK define> */
wchar_t *path = joinpath2(calculate->argv0_path, BUILD_LANDMARK);
if (path == NULL) {
return _PyStatus_NO_MEMORY();
}
int is_build_dir = isfile(path);
PyMem_RawFree(path);
if (is_build_dir) {
/* argv0_path is the build directory (BUILD_LANDMARK exists),
now also check LANDMARK using ismodule(). */
/* Path: <argv0_path> / <VPATH macro> / Lib */
/* or if VPATH is empty: <argv0_path> / Lib */
if (safe_wcscpy(prefix, calculate->argv0_path, prefix_len) < 0) {
return PATHLEN_ERR();
}
status = joinpath(prefix, calculate->vpath_macro, prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
status = joinpath(prefix, L"Lib", prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
int module;
status = ismodule(prefix, &module);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (module) {
/* BUILD_LANDMARK and LANDMARK found */
*found = -1;
return _PyStatus_OK();
}
}
/* Search from argv0_path, until root is found */
status = copy_absolute(prefix, calculate->argv0_path, prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
do {
/* Path: <argv0_path or substring> / <lib_python> / LANDMARK */
size_t n = wcslen(prefix);
status = joinpath(prefix, calculate->lib_python, prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
int module;
status = ismodule(prefix, &module);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (module) {
*found = 1;
return _PyStatus_OK();
}
prefix[n] = L'\0';
reduce(prefix);
} while (prefix[0]);
/* Look at configure's PREFIX.
Path: <PREFIX macro> / <lib_python> / LANDMARK */
if (safe_wcscpy(prefix, calculate->prefix_macro, prefix_len) < 0) {
return PATHLEN_ERR();
}
status = joinpath(prefix, calculate->lib_python, prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
int module;
status = ismodule(prefix, &module);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (module) {
*found = 1;
return _PyStatus_OK();
}
/* Fail */
*found = 0;
return _PyStatus_OK();
}
static PyStatus
calculate_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig)
{
wchar_t prefix[MAXPATHLEN+1];
memset(prefix, 0, sizeof(prefix));
size_t prefix_len = Py_ARRAY_LENGTH(prefix);
PyStatus status;
status = search_for_prefix(calculate, pathconfig,
prefix, prefix_len,
&calculate->prefix_found);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (!calculate->prefix_found) {
if (calculate->warnings) {
fprintf(stderr,
"Could not find platform independent libraries <prefix>\n");
}
calculate->prefix = joinpath2(calculate->prefix_macro,
calculate->lib_python);
}
else {
calculate->prefix = _PyMem_RawWcsdup(prefix);
}
if (calculate->prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
return _PyStatus_OK();
}
static PyStatus
calculate_set_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig)
{
/* Reduce prefix and exec_prefix to their essence,
* e.g. /usr/local/lib/python1.5 is reduced to /usr/local.
* If we're loading relative to the build directory,
* return the compiled-in defaults instead.
*/
if (calculate->prefix_found > 0) {
wchar_t *prefix = _PyMem_RawWcsdup(calculate->prefix);
if (prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
reduce(prefix);
reduce(prefix);
if (prefix[0]) {
pathconfig->prefix = prefix;
}
else {
PyMem_RawFree(prefix);
/* The prefix is the root directory, but reduce() chopped
off the "/". */
pathconfig->prefix = _PyMem_RawWcsdup(separator);
if (pathconfig->prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
}
else {
pathconfig->prefix = _PyMem_RawWcsdup(calculate->prefix_macro);
if (pathconfig->prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
return _PyStatus_OK();
}
static PyStatus
calculate_pybuilddir(const wchar_t *argv0_path,
wchar_t *exec_prefix, size_t exec_prefix_len,
int *found)
{
PyStatus status;
/* Check to see if argv[0] is in the build directory. "pybuilddir.txt"
is written by setup.py and contains the relative path to the location
of shared library modules.
Filename: <argv0_path> / "pybuilddir.txt" */
wchar_t *filename = joinpath2(argv0_path, L"pybuilddir.txt");
if (filename == NULL) {
return _PyStatus_NO_MEMORY();
}
FILE *fp = _Py_wfopen(filename, L"rb");
PyMem_RawFree(filename);
if (fp == NULL) {
errno = 0;
return _PyStatus_OK();
}
char buf[MAXPATHLEN + 1];
size_t n = fread(buf, 1, Py_ARRAY_LENGTH(buf) - 1, fp);
buf[n] = '\0';
fclose(fp);
size_t dec_len;
wchar_t *pybuilddir = _Py_DecodeUTF8_surrogateescape(buf, n, &dec_len);
if (!pybuilddir) {
return DECODE_LOCALE_ERR("pybuilddir.txt", dec_len);
}
/* Path: <argv0_path> / <pybuilddir content> */
if (safe_wcscpy(exec_prefix, argv0_path, exec_prefix_len) < 0) {
PyMem_RawFree(pybuilddir);
return PATHLEN_ERR();
}
status = joinpath(exec_prefix, pybuilddir, exec_prefix_len);
PyMem_RawFree(pybuilddir);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
*found = -1;
return _PyStatus_OK();
}
/* search_for_exec_prefix requires that argv0_path be no more than
MAXPATHLEN bytes long.
*/
static PyStatus
search_for_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig,
wchar_t *exec_prefix, size_t exec_prefix_len,
int *found)
{
PyStatus status;
/* If PYTHONHOME is set, we believe it unconditionally */
if (pathconfig->home) {
/* Path: <home> / <lib_python> / "lib-dynload" */
wchar_t *delim = wcschr(pathconfig->home, DELIM);
if (delim) {
if (safe_wcscpy(exec_prefix, delim+1, exec_prefix_len) < 0) {
return PATHLEN_ERR();
}
}
else {
if (safe_wcscpy(exec_prefix, pathconfig->home, exec_prefix_len) < 0) {
return PATHLEN_ERR();
}
}
status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
*found = 1;
return _PyStatus_OK();
}
/* Check for pybuilddir.txt */
assert(*found == 0);
status = calculate_pybuilddir(calculate->argv0_path,
exec_prefix, exec_prefix_len, found);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (*found) {
return _PyStatus_OK();
}
/* Search from argv0_path, until root is found */
status = copy_absolute(exec_prefix, calculate->argv0_path, exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
do {
/* Path: <argv0_path or substring> / <lib_python> / "lib-dynload" */
size_t n = wcslen(exec_prefix);
status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (isdir(exec_prefix)) {
*found = 1;
return _PyStatus_OK();
}
exec_prefix[n] = L'\0';
reduce(exec_prefix);
} while (exec_prefix[0]);
/* Look at configure's EXEC_PREFIX.
Path: <EXEC_PREFIX macro> / <lib_python> / "lib-dynload" */
if (safe_wcscpy(exec_prefix, calculate->exec_prefix_macro, exec_prefix_len) < 0) {
return PATHLEN_ERR();
}
status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (isdir(exec_prefix)) {
*found = 1;
return _PyStatus_OK();
}
/* Fail */
*found = 0;
return _PyStatus_OK();
}
static PyStatus
calculate_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig)
{
PyStatus status;
wchar_t exec_prefix[MAXPATHLEN+1];
memset(exec_prefix, 0, sizeof(exec_prefix));
size_t exec_prefix_len = Py_ARRAY_LENGTH(exec_prefix);
status = search_for_exec_prefix(calculate, pathconfig,
exec_prefix, exec_prefix_len,
&calculate->exec_prefix_found);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (!calculate->exec_prefix_found) {
if (calculate->warnings) {
fprintf(stderr,
"Could not find platform dependent libraries <exec_prefix>\n");
}
/* <PLATLIBDIR> / "lib-dynload" */
wchar_t *lib_dynload = joinpath2(calculate->platlibdir,
L"lib-dynload");
if (lib_dynload == NULL) {
return _PyStatus_NO_MEMORY();
}
calculate->exec_prefix = joinpath2(calculate->exec_prefix_macro,
lib_dynload);
PyMem_RawFree(lib_dynload);
if (calculate->exec_prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
else {
/* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */
calculate->exec_prefix = _PyMem_RawWcsdup(exec_prefix);
if (calculate->exec_prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
return _PyStatus_OK();
}
static PyStatus
calculate_set_exec_prefix(PyCalculatePath *calculate,
_PyPathConfig *pathconfig)
{
if (calculate->exec_prefix_found > 0) {
wchar_t *exec_prefix = _PyMem_RawWcsdup(calculate->exec_prefix);
if (exec_prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
reduce(exec_prefix);
reduce(exec_prefix);
reduce(exec_prefix);
if (exec_prefix[0]) {
pathconfig->exec_prefix = exec_prefix;
}
else {
/* empty string: use SEP instead */
PyMem_RawFree(exec_prefix);
/* The exec_prefix is the root directory, but reduce() chopped
off the "/". */
pathconfig->exec_prefix = _PyMem_RawWcsdup(separator);
if (pathconfig->exec_prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
}
else {
pathconfig->exec_prefix = _PyMem_RawWcsdup(calculate->exec_prefix_macro);
if (pathconfig->exec_prefix == NULL) {
return _PyStatus_NO_MEMORY();
}
}
return _PyStatus_OK();
}
/* Similar to shutil.which().
If found, write the path into *abs_path_p. */
static PyStatus
calculate_which(const wchar_t *path_env, wchar_t *program_name,
wchar_t **abs_path_p)
{
while (1) {
wchar_t *delim = wcschr(path_env, DELIM);
wchar_t *abs_path;
if (delim) {
wchar_t *path = substring(path_env, delim - path_env);
if (path == NULL) {
return _PyStatus_NO_MEMORY();
}
abs_path = joinpath2(path, program_name);
PyMem_RawFree(path);
}
else {
abs_path = joinpath2(path_env, program_name);
}
if (abs_path == NULL) {
return _PyStatus_NO_MEMORY();
}
if (isxfile(abs_path)) {
*abs_path_p = abs_path;
return _PyStatus_OK();
}
PyMem_RawFree(abs_path);
if (!delim) {
break;
}
path_env = delim + 1;
}
/* not found */
return _PyStatus_OK();
}
#ifdef __APPLE__
static PyStatus
calculate_program_macos(wchar_t **abs_path_p)
{
char execpath[MAXPATHLEN + 1];
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
uint32_t nsexeclength = Py_ARRAY_LENGTH(execpath) - 1;
#else
unsigned long nsexeclength = Py_ARRAY_LENGTH(execpath) - 1;
#endif
/* On Mac OS X, if a script uses an interpreter of the form
"#!/opt/python2.3/bin/python", the kernel only passes "python"
as argv[0], which falls through to the $PATH search below.
If /opt/python2.3/bin isn't in your path, or is near the end,
this algorithm may incorrectly find /usr/bin/python. To work
around this, we can use _NSGetExecutablePath to get a better
hint of what the intended interpreter was, although this
will fail if a relative path was used. but in that case,
absolutize() should help us out below
*/
if (_NSGetExecutablePath(execpath, &nsexeclength) != 0
|| (wchar_t)execpath[0] != SEP)
{
/* _NSGetExecutablePath() failed or the path is relative */
return _PyStatus_OK();
}
size_t len;
*abs_path_p = Py_DecodeLocale(execpath, &len);
if (*abs_path_p == NULL) {
return DECODE_LOCALE_ERR("executable path", len);
}
return _PyStatus_OK();
}
#endif /* __APPLE__ */
static PyStatus
calculate_program_impl(PyCalculatePath *calculate, _PyPathConfig *pathconfig)
{
assert(pathconfig->program_full_path == NULL);
PyStatus status;
/* 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.
*/
if (wcschr(pathconfig->program_name, SEP)) {
pathconfig->program_full_path = _PyMem_RawWcsdup(pathconfig->program_name);
if (pathconfig->program_full_path == NULL) {
return _PyStatus_NO_MEMORY();
}
return _PyStatus_OK();
}
#ifdef __APPLE__
wchar_t *abs_path = NULL;
status = calculate_program_macos(&abs_path);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (abs_path) {
pathconfig->program_full_path = abs_path;
return _PyStatus_OK();
}
#endif /* __APPLE__ */
if (calculate->path_env) {
wchar_t *abs_path = NULL;
status = calculate_which(calculate->path_env, pathconfig->program_name,
&abs_path);
if (_PyStatus_EXCEPTION(status)) {
return status;
}
if (abs_path) {
pathconfig->program_full_path = abs_path;
return _PyStatus_OK();