/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
bytes long.
*/
static int
search_for_prefix(wchar_t *argv0_path, wchar_t *home, wchar_t *_prefix)
{
size_t n;
wchar_t *vpath;
/* If PYTHONHOME is set, we believe it unconditionally */
if (home) {
wchar_t *delim;
wcsncpy(prefix, home, MAXPATHLEN);
delim = wcschr(prefix, DELIM);
if (delim)
*delim = L'\0';
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
return 1;
}
/* Check to see if argv[0] is in the build directory */
wcscpy(prefix, argv0_path);
joinpath(prefix, L"Modules/Setup");
if (isfile(prefix)) {
/* Check VPATH to see if argv0_path is in the build directory. */
vpath = _Py_char2wchar(VPATH, NULL);
if (vpath != NULL) {
wcscpy(prefix, argv0_path);
joinpath(prefix, vpath);
PyMem_Free(vpath);
joinpath(prefix, L"Lib");
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return -1;
}
}
/* Search from argv0_path, until root is found */
copy_absolute(prefix, argv0_path, MAXPATHLEN+1);
do {
n = wcslen(prefix);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
prefix[n] = L'\0';
reduce(prefix);
} while (prefix[0]);
/* Look at configure's PREFIX */
wcsncpy(prefix, _prefix, MAXPATHLEN);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
/* Fail */
return 0;
}
/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
bytes long.
*/
static int
search_for_prefix(char *argv0_path, char *home)
{
size_t n;
char *vpath;
/* If PYTHONHOME is set, we believe it unconditionally */
if (home) {
char *delim;
strncpy(prefix, home, MAXPATHLEN);
delim = strchr(prefix, DELIM);
if (delim)
*delim = '\0';
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
return 1;
}
/* Check to see if argv[0] is in the build directory */
strcpy(prefix, argv0_path);
joinpath(prefix, "Modules/Setup");
if (isfile(prefix)) {
/* Check VPATH to see if argv0_path is in the build directory. */
vpath = VPATH;
strcpy(prefix, argv0_path);
joinpath(prefix, vpath);
joinpath(prefix, "Lib");
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return -1;
}
/* Search from argv0_path, until root is found */
copy_absolute(prefix, argv0_path);
do {
n = strlen(prefix);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
prefix[n] = '\0';
reduce(prefix);
} while (prefix[0]);
/* Look at configure's PREFIX */
strncpy(prefix, PREFIX, MAXPATHLEN);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
/* Fail */
return 0;
}
/* gotlandmark only called by search_for_prefix, which ensures
* 'prefix' is null terminated in bounds. join() ensures
* 'landmark' can not overflow prefix if too long.
*/
static int
gotlandmark(char *landmark)
{
int n, ok;
n = strlen(prefix);
join(prefix, landmark);
ok = ismodule(prefix);
prefix[n] = '\0';
return ok;
}
/* gotlandmark only called by search_for_prefix, which ensures
'prefix' is null terminated in bounds. join() ensures
'landmark' can not overflow prefix if too long.
*/
static int
gotlandmark(const wchar_t *landmark)
{
int ok;
Py_ssize_t n = wcsnlen_s(prefix, MAXPATHLEN);
join(prefix, landmark);
ok = ismodule(prefix, FALSE);
prefix[n] = '\0';
return ok;
}
/* gotlandmark only called by search_for_prefix, which ensures
'prefix' is null terminated in bounds. join() ensures
'landmark' can not overflow prefix if too long.
*/
static int
gotlandmark(wchar_t *landmark)
{
int ok;
Py_ssize_t n;
n = wcslen(prefix);
join(prefix, landmark);
ok = ismodule(prefix);
prefix[n] = '\0';
return ok;
}
static void
calculate_path(void)
{
extern wchar_t *Py_GetProgramName(void);
static wchar_t delimiter[2] = {DELIM, '\0'};
static wchar_t separator[2] = {SEP, '\0'};
char *_rtpypath = Py_GETENV("PYTHONPATH"); /* XXX use wide version on Windows */
wchar_t rtpypath[MAXPATHLEN+1];
wchar_t *home = Py_GetPythonHome();
char *_path = getenv("PATH");
wchar_t *path_buffer = NULL;
wchar_t *path = NULL;
wchar_t *prog = Py_GetProgramName();
wchar_t argv0_path[MAXPATHLEN+1];
wchar_t zip_path[MAXPATHLEN+1];
int pfound, efound; /* 1 if found; -1 if found build directory */
wchar_t *buf;
size_t bufsz;
size_t prefixsz;
wchar_t *defpath;
#ifdef WITH_NEXT_FRAMEWORK
NSModule pythonModule;
#endif
#ifdef __APPLE__
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
uint32_t nsexeclength = MAXPATHLEN;
#else
unsigned long nsexeclength = MAXPATHLEN;
#endif
char execpath[MAXPATHLEN+1];
#endif
wchar_t *_pythonpath, *_prefix, *_exec_prefix;
_pythonpath = _Py_char2wchar(PYTHONPATH, NULL);
_prefix = _Py_char2wchar(PREFIX, NULL);
_exec_prefix = _Py_char2wchar(EXEC_PREFIX, NULL);
if (!_pythonpath || !_prefix || !_exec_prefix) {
Py_FatalError(
"Unable to decode path variables in getpath.c: "
"memory error");
}
if (_path) {
path_buffer = _Py_char2wchar(_path, NULL);
path = path_buffer;
}
/* 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(prog, SEP))
wcsncpy(progpath, prog, MAXPATHLEN);
#ifdef __APPLE__
/* 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
*/
else if(0 == _NSGetExecutablePath(execpath, &nsexeclength) && execpath[0] == SEP) {
size_t r = mbstowcs(progpath, execpath, MAXPATHLEN+1);
if (r == (size_t)-1 || r > MAXPATHLEN) {
/* Could not convert execpath, or it's too long. */
progpath[0] = '\0';
}
}
#endif /* __APPLE__ */
else if (path) {
while (1) {
wchar_t *delim = wcschr(path, DELIM);
if (delim) {
size_t len = delim - path;
if (len > MAXPATHLEN)
len = MAXPATHLEN;
wcsncpy(progpath, path, len);
*(progpath + len) = '\0';
}
else
wcsncpy(progpath, path, MAXPATHLEN);
joinpath(progpath, prog);
if (isxfile(progpath))
break;
if (!delim) {
progpath[0] = L'\0';
break;
}
path = delim + 1;
}
}
else
progpath[0] = '\0';
if (path_buffer != NULL)
PyMem_Free(path_buffer);
if (progpath[0] != SEP && progpath[0] != '\0')
absolutize(progpath);
wcsncpy(argv0_path, progpath, MAXPATHLEN);
argv0_path[MAXPATHLEN] = '\0';
#ifdef WITH_NEXT_FRAMEWORK
/* On Mac OS X we have a special case if we're running from a framework.
** This is because the python home should be set relative to the library,
** which is in the framework, not relative to the executable, which may
** be outside of the framework. Except when we're in the build directory...
*/
pythonModule = NSModuleForSymbol(NSLookupAndBindSymbol("_Py_Initialize"));
/* Use dylib functions to find out where the framework was loaded from */
buf = (wchar_t *)NSLibraryNameForModule(pythonModule);
if (buf != NULL) {
/* We're in a framework. */
/* See if we might be in the build directory. The framework in the
** build directory is incomplete, it only has the .dylib and a few
** needed symlinks, it doesn't have the Lib directories and such.
** If we're running with the framework from the build directory we must
** be running the interpreter in the build directory, so we use the
** build-directory-specific logic to find Lib and such.
*/
wcsncpy(argv0_path, buf, MAXPATHLEN);
reduce(argv0_path);
joinpath(argv0_path, lib_python);
joinpath(argv0_path, LANDMARK);
if (!ismodule(argv0_path)) {
/* We are in the build directory so use the name of the
executable - we know that the absolute path is passed */
wcsncpy(argv0_path, progpath, MAXPATHLEN);
}
else {
/* Use the location of the library as the progpath */
wcsncpy(argv0_path, buf, MAXPATHLEN);
}
}
#endif
#if HAVE_READLINK
{
wchar_t tmpbuffer[MAXPATHLEN+1];
int linklen = _Py_wreadlink(progpath, tmpbuffer, MAXPATHLEN);
while (linklen != -1) {
if (tmpbuffer[0] == SEP)
/* tmpbuffer should never be longer than MAXPATHLEN,
but extra check does not hurt */
wcsncpy(argv0_path, tmpbuffer, MAXPATHLEN);
else {
/* Interpret relative to progpath */
reduce(argv0_path);
joinpath(argv0_path, tmpbuffer);
}
linklen = _Py_wreadlink(argv0_path, tmpbuffer, MAXPATHLEN);
}
}
#endif /* HAVE_READLINK */
reduce(argv0_path);
/* At this point, argv0_path is guaranteed to be less than
MAXPATHLEN bytes long.
*/
if (!(pfound = search_for_prefix(argv0_path, home, _prefix))) {
if (!Py_FrozenFlag)
fprintf(stderr,
"Could not find platform independent libraries <prefix>\n");
wcsncpy(prefix, _prefix, MAXPATHLEN);
joinpath(prefix, lib_python);
}
else
reduce(prefix);
wcsncpy(zip_path, prefix, MAXPATHLEN);
zip_path[MAXPATHLEN] = L'\0';
if (pfound > 0) { /* Use the reduced prefix returned by Py_GetPrefix() */
reduce(zip_path);
reduce(zip_path);
}
else
wcsncpy(zip_path, _prefix, MAXPATHLEN);
joinpath(zip_path, L"lib/python00.zip");
bufsz = wcslen(zip_path); /* Replace "00" with version */
zip_path[bufsz - 6] = VERSION[0];
zip_path[bufsz - 5] = VERSION[2];
if (!(efound = search_for_exec_prefix(argv0_path, home, _exec_prefix))) {
if (!Py_FrozenFlag)
fprintf(stderr,
"Could not find platform dependent libraries <exec_prefix>\n");
wcsncpy(exec_prefix, _exec_prefix, MAXPATHLEN);
joinpath(exec_prefix, L"lib/lib-dynload");
}
/* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */
if ((!pfound || !efound) && !Py_FrozenFlag)
fprintf(stderr,
"Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");
/* Calculate size of return buffer.
*/
bufsz = 0;
if (_rtpypath) {
size_t s = mbstowcs(rtpypath, _rtpypath, sizeof(rtpypath)/sizeof(wchar_t));
if (s == (size_t)-1 || s >=sizeof(rtpypath))
/* XXX deal with errors more gracefully */
_rtpypath = NULL;
if (_rtpypath)
bufsz += wcslen(rtpypath) + 1;
}
defpath = _pythonpath;
prefixsz = wcslen(prefix) + 1;
while (1) {
wchar_t *delim = wcschr(defpath, DELIM);
if (defpath[0] != SEP)
/* Paths are relative to prefix */
bufsz += prefixsz;
if (delim)
bufsz += delim - defpath + 1;
else {
bufsz += wcslen(defpath) + 1;
break;
}
defpath = delim + 1;
}
bufsz += wcslen(zip_path) + 1;
bufsz += wcslen(exec_prefix) + 1;
/* This is the only malloc call in this file */
buf = (wchar_t *)PyMem_Malloc(bufsz*sizeof(wchar_t));
if (buf == NULL) {
/* We can't exit, so print a warning and limp along */
fprintf(stderr, "Not enough memory for dynamic PYTHONPATH.\n");
fprintf(stderr, "Using default static PYTHONPATH.\n");
module_search_path = L"" PYTHONPATH;
}
else {
/* Run-time value of $PYTHONPATH goes first */
if (_rtpypath) {
wcscpy(buf, rtpypath);
wcscat(buf, delimiter);
}
else
buf[0] = '\0';
/* Next is the default zip path */
wcscat(buf, zip_path);
wcscat(buf, delimiter);
/* Next goes merge of compile-time $PYTHONPATH with
* dynamically located prefix.
*/
defpath = _pythonpath;
while (1) {
wchar_t *delim = wcschr(defpath, DELIM);
if (defpath[0] != SEP) {
wcscat(buf, prefix);
wcscat(buf, separator);
}
if (delim) {
size_t len = delim - defpath + 1;
size_t end = wcslen(buf) + len;
wcsncat(buf, defpath, len);
*(buf + end) = '\0';
}
else {
wcscat(buf, defpath);
break;
}
defpath = delim + 1;
}
wcscat(buf, delimiter);
/* Finally, on goes the directory for dynamic-load modules */
wcscat(buf, exec_prefix);
/* And publish the results */
module_search_path = buf;
}
/* 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 (pfound > 0) {
reduce(prefix);
reduce(prefix);
/* The prefix is the root directory, but reduce() chopped
* off the "/". */
if (!prefix[0])
wcscpy(prefix, separator);
}
else
wcsncpy(prefix, _prefix, MAXPATHLEN);
if (efound > 0) {
reduce(exec_prefix);
reduce(exec_prefix);
reduce(exec_prefix);
if (!exec_prefix[0])
wcscpy(exec_prefix, separator);
}
else
wcsncpy(exec_prefix, _exec_prefix, MAXPATHLEN);
PyMem_Free(_pythonpath);
PyMem_Free(_prefix);
PyMem_Free(_exec_prefix);
}
static void
calculate_path(void)
{
extern char *Py_GetProgramName(void);
static char delimiter[2] = {DELIM, '\0'};
static char separator[2] = {SEP, '\0'};
char *pythonpath = PYTHONPATH;
char *rtpypath = Py_GETENV("PYTHONPATH");
char *home = Py_GetPythonHome();
char *path = getenv("PATH");
char *prog = Py_GetProgramName();
char argv0_path[MAXPATHLEN+1];
char zip_path[MAXPATHLEN+1];
int pfound, efound; /* 1 if found; -1 if found build directory */
char *buf;
size_t bufsz;
size_t prefixsz;
char *defpath = pythonpath;
#ifdef WITH_NEXT_FRAMEWORK
NSModule pythonModule;
#endif
/* 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 (strchr(prog, SEP))
strncpy(progpath, prog, MAXPATHLEN);
else if (path) {
while (1) {
char *delim = strchr(path, DELIM);
if (delim) {
size_t len = delim - path;
if (len > MAXPATHLEN)
len = MAXPATHLEN;
strncpy(progpath, path, len);
*(progpath + len) = '\0';
}
else
strncpy(progpath, path, MAXPATHLEN);
joinpath(progpath, prog);
if (isxfile(progpath))
break;
if (!delim) {
progpath[0] = '\0';
break;
}
path = delim + 1;
}
}
else
progpath[0] = '\0';
if (progpath[0] != SEP)
absolutize(progpath);
strncpy(argv0_path, progpath, MAXPATHLEN);
argv0_path[MAXPATHLEN] = '\0';
#ifdef WITH_NEXT_FRAMEWORK
/* On Mac OS X we have a special case if we're running from a framework.
** This is because the python home should be set relative to the library,
** which is in the framework, not relative to the executable, which may
** be outside of the framework. Except when we're in the build directory...
*/
pythonModule = NSModuleForSymbol(NSLookupAndBindSymbol("_Py_Initialize"));
/* Use dylib functions to find out where the framework was loaded from */
buf = (char *)NSLibraryNameForModule(pythonModule);
if (buf != NULL) {
/* We're in a framework. */
/* See if we might be in the build directory. The framework in the
** build directory is incomplete, it only has the .dylib and a few
** needed symlinks, it doesn't have the Lib directories and such.
** If we're running with the framework from the build directory we must
** be running the interpreter in the build directory, so we use the
** build-directory-specific logic to find Lib and such.
*/
strncpy(argv0_path, buf, MAXPATHLEN);
reduce(argv0_path);
joinpath(argv0_path, lib_python);
joinpath(argv0_path, LANDMARK);
if (!ismodule(argv0_path)) {
/* We are in the build directory so use the name of the
executable - we know that the absolute path is passed */
strncpy(argv0_path, prog, MAXPATHLEN);
}
else {
/* Use the location of the library as the progpath */
strncpy(argv0_path, buf, MAXPATHLEN);
}
}
#endif
#if HAVE_READLINK
{
char tmpbuffer[MAXPATHLEN+1];
int linklen = readlink(progpath, tmpbuffer, MAXPATHLEN);
while (linklen != -1) {
/* It's not null terminated! */
tmpbuffer[linklen] = '\0';
if (tmpbuffer[0] == SEP)
/* tmpbuffer should never be longer than MAXPATHLEN,
but extra check does not hurt */
strncpy(argv0_path, tmpbuffer, MAXPATHLEN);
else {
/* Interpret relative to progpath */
reduce(argv0_path);
joinpath(argv0_path, tmpbuffer);
}
linklen = readlink(argv0_path, tmpbuffer, MAXPATHLEN);
}
}
#endif /* HAVE_READLINK */
reduce(argv0_path);
/* At this point, argv0_path is guaranteed to be less than
MAXPATHLEN bytes long.
*/
if (!(pfound = search_for_prefix(argv0_path, home))) {
if (!Py_FrozenFlag)
fprintf(stderr,
"Could not find platform independent libraries <prefix>\n");
strncpy(prefix, PREFIX, MAXPATHLEN);
joinpath(prefix, lib_python);
}
else
reduce(prefix);
strncpy(zip_path, prefix, MAXPATHLEN);
zip_path[MAXPATHLEN] = '\0';
if (pfound > 0) { /* Use the reduced prefix returned by Py_GetPrefix() */
reduce(zip_path);
reduce(zip_path);
}
else
strncpy(zip_path, PREFIX, MAXPATHLEN);
joinpath(zip_path, "lib/python00.zip");
bufsz = strlen(zip_path); /* Replace "00" with version */
zip_path[bufsz - 6] = VERSION[0];
zip_path[bufsz - 5] = VERSION[2];
if (!(efound = search_for_exec_prefix(argv0_path, home))) {
if (!Py_FrozenFlag)
fprintf(stderr,
"Could not find platform dependent libraries <exec_prefix>\n");
strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
joinpath(exec_prefix, "lib/lib-dynload");
}
/* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */
if ((!pfound || !efound) && !Py_FrozenFlag)
fprintf(stderr,
"Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");
/* Calculate size of return buffer.
*/
bufsz = 0;
if (rtpypath)
bufsz += strlen(rtpypath) + 1;
prefixsz = strlen(prefix) + 1;
while (1) {
char *delim = strchr(defpath, DELIM);
if (defpath[0] != SEP)
/* Paths are relative to prefix */
bufsz += prefixsz;
if (delim)
bufsz += delim - defpath + 1;
else {
bufsz += strlen(defpath) + 1;
break;
}
defpath = delim + 1;
}
bufsz += strlen(zip_path) + 1;
bufsz += strlen(exec_prefix) + 1;
/* This is the only malloc call in this file */
buf = PyMem_Malloc(bufsz);
if (buf == NULL) {
/* We can't exit, so print a warning and limp along */
fprintf(stderr, "Not enough memory for dynamic PYTHONPATH.\n");
fprintf(stderr, "Using default static PYTHONPATH.\n");
module_search_path = PYTHONPATH;
}
else {
/* Run-time value of $PYTHONPATH goes first */
if (rtpypath) {
strcpy(buf, rtpypath);
strcat(buf, delimiter);
}
else
buf[0] = '\0';
/* Next is the default zip path */
strcat(buf, zip_path);
strcat(buf, delimiter);
/* Next goes merge of compile-time $PYTHONPATH with
* dynamically located prefix.
*/
defpath = pythonpath;
while (1) {
char *delim = strchr(defpath, DELIM);
if (defpath[0] != SEP) {
strcat(buf, prefix);
strcat(buf, separator);
}
if (delim) {
size_t len = delim - defpath + 1;
size_t end = strlen(buf) + len;
strncat(buf, defpath, len);
*(buf + end) = '\0';
}
else {
strcat(buf, defpath);
break;
}
defpath = delim + 1;
}
strcat(buf, delimiter);
/* Finally, on goes the directory for dynamic-load modules */
strcat(buf, exec_prefix);
/* And publish the results */
module_search_path = buf;
}
/* 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 (pfound > 0) {
reduce(prefix);
reduce(prefix);
}
else
strncpy(prefix, PREFIX, MAXPATHLEN);
if (efound > 0) {
reduce(exec_prefix);
reduce(exec_prefix);
reduce(exec_prefix);
}
else
strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
}
/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
bytes long.
*/
static int
search_for_prefix(char *argv0_path, char *home)
{
size_t n;
char *vpath;
/* If PYTHONHOME is set, we believe it unconditionally */
if (home) {
char *delim;
strncpy(prefix, home, MAXPATHLEN);
delim = strchr(prefix, DELIM);
if (delim)
*delim = '\0';
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
return 1;
}
/* Check to see if argv[0] is in the build directory */
strcpy(prefix, argv0_path);
joinpath(prefix, "Modules/Setup");
if (isfile(prefix)) {
/* Check VPATH to see if argv0_path is in the build directory.
* Complication: the VPATH passed in is relative to the
* Modules build directory and points to the Modules source
* directory; we need it relative to the build tree and
* pointing to the source tree. Solution: chop off a leading
* ".." (but only if it's there -- it could be an absolute
* path) and chop off the final component (assuming it's
* "Modules").
*/
vpath = VPATH;
if (vpath[0] == '.' && vpath[1] == '.' && vpath[2] == '/')
vpath += 3;
strcpy(prefix, argv0_path);
joinpath(prefix, vpath);
reduce(prefix);
joinpath(prefix, "Lib");
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return -1;
}
/* Search from argv0_path, until root is found */
init_path_from_argv0(prefix, argv0_path);
do {
n = strlen(prefix);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
prefix[n] = '\0';
reduce(prefix);
} while (prefix[0]);
/* Look at configure's PREFIX */
strncpy(prefix, PREFIX, MAXPATHLEN);
joinpath(prefix, lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix))
return 1;
/* Fail */
return 0;
}
static _PyInitError
calculate_argv0_path(PyCalculatePath *calculate, const wchar_t *program_full_path)
{
wcsncpy(calculate->argv0_path, program_full_path, MAXPATHLEN);
calculate->argv0_path[MAXPATHLEN] = '\0';
#ifdef WITH_NEXT_FRAMEWORK
NSModule pythonModule;
/* On Mac OS X we have a special case if we're running from a framework.
** This is because the python home should be set relative to the library,
** which is in the framework, not relative to the executable, which may
** be outside of the framework. Except when we're in the build directory...
*/
pythonModule = NSModuleForSymbol(NSLookupAndBindSymbol("_Py_Initialize"));
/* Use dylib functions to find out where the framework was loaded from */
const char* modPath = NSLibraryNameForModule(pythonModule);
if (modPath != NULL) {
/* We're in a framework. */
/* See if we might be in the build directory. The framework in the
** build directory is incomplete, it only has the .dylib and a few
** needed symlinks, it doesn't have the Lib directories and such.
** If we're running with the framework from the build directory we must
** be running the interpreter in the build directory, so we use the
** build-directory-specific logic to find Lib and such.
*/
size_t len;
wchar_t* wbuf = Py_DecodeLocale(modPath, &len);
if (wbuf == NULL) {
return DECODE_LOCALE_ERR("framework location", len);
}
wcsncpy(calculate->argv0_path, wbuf, MAXPATHLEN);
reduce(calculate->argv0_path);
joinpath(calculate->argv0_path, calculate->lib_python);
joinpath(calculate->argv0_path, LANDMARK);
if (!ismodule(calculate->argv0_path)) {
/* We are in the build directory so use the name of the
executable - we know that the absolute path is passed */
wcsncpy(calculate->argv0_path, program_full_path, MAXPATHLEN);
}
else {
/* Use the location of the library as the program_full_path */
wcsncpy(calculate->argv0_path, wbuf, MAXPATHLEN);
}
PyMem_RawFree(wbuf);
}
#endif
#if HAVE_READLINK
wchar_t tmpbuffer[MAXPATHLEN+1];
int linklen = _Py_wreadlink(program_full_path, tmpbuffer, MAXPATHLEN);
while (linklen != -1) {
if (tmpbuffer[0] == SEP) {
/* tmpbuffer should never be longer than MAXPATHLEN,
but extra check does not hurt */
wcsncpy(calculate->argv0_path, tmpbuffer, MAXPATHLEN);
}
else {
/* Interpret relative to program_full_path */
reduce(calculate->argv0_path);
joinpath(calculate->argv0_path, tmpbuffer);
}
linklen = _Py_wreadlink(calculate->argv0_path, tmpbuffer, MAXPATHLEN);
}
#endif /* HAVE_READLINK */
reduce(calculate->argv0_path);
/* At this point, argv0_path is guaranteed to be less than
MAXPATHLEN bytes long. */
return _Py_INIT_OK();
}
/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
bytes long.
*/
static int
search_for_prefix(const _PyCoreConfig *core_config,
PyCalculatePath *calculate, wchar_t *prefix)
{
size_t n;
wchar_t *vpath;
/* If PYTHONHOME is set, we believe it unconditionally */
if (core_config->home) {
wcsncpy(prefix, core_config->home, MAXPATHLEN);
prefix[MAXPATHLEN] = L'\0';
wchar_t *delim = wcschr(prefix, DELIM);
if (delim) {
*delim = L'\0';
}
joinpath(prefix, calculate->lib_python);
joinpath(prefix, LANDMARK);
return 1;
}
/* Check to see if argv[0] is in the build directory */
wcsncpy(prefix, calculate->argv0_path, MAXPATHLEN);
prefix[MAXPATHLEN] = L'\0';
joinpath(prefix, L"Modules/Setup.local");
if (isfile(prefix)) {
/* Check VPATH to see if argv0_path is in the build directory. */
vpath = Py_DecodeLocale(VPATH, NULL);
if (vpath != NULL) {
wcsncpy(prefix, calculate->argv0_path, MAXPATHLEN);
prefix[MAXPATHLEN] = L'\0';
joinpath(prefix, vpath);
PyMem_RawFree(vpath);
joinpath(prefix, L"Lib");
joinpath(prefix, LANDMARK);
if (ismodule(prefix)) {
return -1;
}
}
}
/* Search from argv0_path, until root is found */
copy_absolute(prefix, calculate->argv0_path, MAXPATHLEN+1);
do {
n = wcslen(prefix);
joinpath(prefix, calculate->lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix)) {
return 1;
}
prefix[n] = L'\0';
reduce(prefix);
} while (prefix[0]);
/* Look at configure's PREFIX */
wcsncpy(prefix, calculate->prefix, MAXPATHLEN);
prefix[MAXPATHLEN] = L'\0';
joinpath(prefix, calculate->lib_python);
joinpath(prefix, LANDMARK);
if (ismodule(prefix)) {
return 1;
}
/* Fail */
return 0;
}