FCL/sf/adapt/qemu: comparison symbian-qemu-0.9.1-12/python-2.6.1/Modules/getpath.c

equal deleted inserted replaced

-:ffa851df0825
+:2fb8b9db1c86
+/* Return the initial module search path. */
+#include "Python.h"
+#include "osdefs.h"
+#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 $PATH environment
+* variable), the original argv[0] string is used.
+*
+* Next, the executable location is examined to see if it is a symbolic
+* link.  If so, the link is chased (correctly interpreting a relative
+* pathname if one is found) and the directory of the link target is used.
+*
+* Finally, argv0_path is set to the directory containing the executable
+* (i.e. the last component is stripped).
+*
+* With argv0_path in hand, we perform a number of steps.  The same steps
+* are performed for prefix and for exec_prefix, but with a different
+* landmark.
+*
+* Step 1. Are we running python out of the build directory?  This is
+* checked by looking for a different kind of landmark relative to
+* argv0_path.  For prefix, the landmark's path is derived from the VPATH
+* preprocessor variable (taking into account that its value is almost, but
+* not quite, what we need).  For exec_prefix, the landmark is
+* Modules/Setup.  If the landmark is found, we're done.
+*
+* For the remaining steps, the prefix landmark will always be
+* lib/python$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.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifndef VERSION
+#define VERSION "2.1"
+#endif
+#ifndef VPATH
+#define VPATH "."
+#endif
+#ifndef PREFIX
+#  ifdef __VMS
+#    define PREFIX ""
+#  else
+#    define PREFIX "/usr/local"
+#  endif
+#endif
+#ifndef EXEC_PREFIX
+#define EXEC_PREFIX PREFIX
+#endif
+#ifndef PYTHONPATH
+#define PYTHONPATH PREFIX "/lib/python" VERSION ":" \
+EXEC_PREFIX "/lib/python" VERSION "/lib-dynload"
+#endif
+#ifndef LANDMARK
+#define LANDMARK "os.py"
+#endif
+static char prefix[MAXPATHLEN+1];
+static char exec_prefix[MAXPATHLEN+1];
+static char progpath[MAXPATHLEN+1];
+static char *module_search_path = NULL;
+static char lib_python[] = "lib/python" VERSION;
+static void
+reduce(char *dir)
+{
+size_t i = strlen(dir);
+while (i > 0 && dir[i] != SEP)
+--i;
+dir[i] = '\0';
+}
+static int
+isfile(char *filename)          /* Is file, not directory */
+{
+struct stat buf;
+if (stat(filename, &buf) != 0)
+return 0;
+if (!S_ISREG(buf.st_mode))
+return 0;
+return 1;
+}
+static int
+ismodule(char *filename)        /* Is module -- check for .pyc/.pyo too */
+{
+if (isfile(filename))
+return 1;
+/* Check for the compiled version of prefix. */
+if (strlen(filename) < MAXPATHLEN) {
+strcat(filename, Py_OptimizeFlag ? "o" : "c");
+if (isfile(filename))
+return 1;
+}
+return 0;
+}
+static int
+isxfile(char *filename)         /* Is executable file */
+{
+struct stat buf;
+if (stat(filename, &buf) != 0)
+return 0;
+if (!S_ISREG(buf.st_mode))
+return 0;
+if ((buf.st_mode & 0111) == 0)
+return 0;
+return 1;
+}
+static int
+isdir(char *filename)                   /* Is directory */
+{
+struct stat buf;
+if (stat(filename, &buf) != 0)
+return 0;
+if (!S_ISDIR(buf.st_mode))
+return 0;
+return 1;
+}
+/* Add a path component, by appending stuff to buffer.
+buffer must have at least MAXPATHLEN + 1 bytes allocated, and contain a
+NUL-terminated string with no more than MAXPATHLEN characters (not counting
+the trailing NUL).  It's a fatal error if it contains a string longer than
+that (callers must be careful!).  If these requirements are met, it's
+guaranteed that buffer will still be a NUL-terminated string with no more
+than MAXPATHLEN characters at exit.  If stuff is too long, only as much of
+stuff as fits will be appended.
+*/
+static void
+joinpath(char *buffer, char *stuff)
+{
+size_t n, k;
+if (stuff[0] == SEP)
+n = 0;
+else {
+n = strlen(buffer);
+if (n > 0 && buffer[n-1] != SEP && n < MAXPATHLEN)
+buffer[n++] = SEP;
+}
+if (n > MAXPATHLEN)
+	Py_FatalError("buffer overflow in getpath.c's joinpath()");
+k = strlen(stuff);
+if (n + k > MAXPATHLEN)
+k = MAXPATHLEN - n;
+strncpy(buffer+n, stuff, k);
+buffer[n+k] = '\0';
+}
+/* copy_absolute requires that path be allocated at least
+MAXPATHLEN + 1 bytes and that p be no more than MAXPATHLEN bytes. */
+static void
+copy_absolute(char *path, char *p)
+{
+if (p[0] == SEP)
+strcpy(path, p);
+else {
+getcwd(path, MAXPATHLEN);
+if (p[0] == '.' && p[1] == SEP)
+p += 2;
+joinpath(path, p);
+}
+}
+/* absolutize() requires that path be allocated at least MAXPATHLEN+1 bytes. */
+static void
+absolutize(char *path)
+{
+char buffer[MAXPATHLEN + 1];
+if (path[0] == SEP)
+return;
+copy_absolute(buffer, path);
+strcpy(path, buffer);
+}
+/* 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;
+}
+/* search_for_exec_prefix requires that argv0_path be no more than
+MAXPATHLEN bytes long.
+*/
+static int
+search_for_exec_prefix(char *argv0_path, char *home)
+{
+size_t n;
+/* If PYTHONHOME is set, we believe it unconditionally */
+if (home) {
+char *delim;
+delim = strchr(home, DELIM);
+if (delim)
+strncpy(exec_prefix, delim+1, MAXPATHLEN);
+else
+strncpy(exec_prefix, home, MAXPATHLEN);
+joinpath(exec_prefix, lib_python);
+joinpath(exec_prefix, "lib-dynload");
+return 1;
+}
+/* Check to see if argv[0] is in the build directory */
+strcpy(exec_prefix, argv0_path);
+joinpath(exec_prefix, "Modules/Setup");
+if (isfile(exec_prefix)) {
+reduce(exec_prefix);
+return -1;
+}
+/* Search from argv0_path, until root is found */
+copy_absolute(exec_prefix, argv0_path);
+do {
+n = strlen(exec_prefix);
+joinpath(exec_prefix, lib_python);
+joinpath(exec_prefix, "lib-dynload");
+if (isdir(exec_prefix))
+return 1;
+exec_prefix[n] = '\0';
+reduce(exec_prefix);
+} while (exec_prefix[0]);
+/* Look at configure's EXEC_PREFIX */
+strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
+joinpath(exec_prefix, lib_python);
+joinpath(exec_prefix, "lib-dynload");
+if (isdir(exec_prefix))
+return 1;
+/* Fail */
+return 0;
+}
+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
+#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
+#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);
+#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(progpath, &nsexeclength) && progpath[0] == SEP)
+;
+#endif /* __APPLE__ */
+	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 = (char *)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);
+	/* The prefix is the root directory, but reduce() chopped
+	 * off the "/". */
+	if (!prefix[0])
+		strcpy(prefix, separator);
+}
+else
+strncpy(prefix, PREFIX, MAXPATHLEN);
+if (efound > 0) {
+reduce(exec_prefix);
+reduce(exec_prefix);
+reduce(exec_prefix);
+	if (!exec_prefix[0])
+		strcpy(exec_prefix, separator);
+}
+else
+strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
+}
+/* External interface */
+char *
+Py_GetPath(void)
+{
+if (!module_search_path)
+calculate_path();
+return module_search_path;
+}
+char *
+Py_GetPrefix(void)
+{
+if (!module_search_path)
+calculate_path();
+return prefix;
+}
+char *
+Py_GetExecPrefix(void)
+{
+if (!module_search_path)
+calculate_path();
+return exec_prefix;
+}
+char *
+Py_GetProgramFullPath(void)
+{
+if (!module_search_path)
+calculate_path();
+return progpath;
+}
+#ifdef __cplusplus
+}
+#endif