diff options
Diffstat (limited to 'AppPkg/Applications/Python/Python-2.7.2/Modules/getpath.c')
| -rw-r--r-- | AppPkg/Applications/Python/Python-2.7.2/Modules/getpath.c | 698 |
1 files changed, 698 insertions, 0 deletions
diff --git a/AppPkg/Applications/Python/Python-2.7.2/Modules/getpath.c b/AppPkg/Applications/Python/Python-2.7.2/Modules/getpath.c new file mode 100644 index 0000000000..24fedd9dc5 --- /dev/null +++ b/AppPkg/Applications/Python/Python-2.7.2/Modules/getpath.c @@ -0,0 +1,698 @@ +/* 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 {
+ if (!getcwd(path, MAXPATHLEN)) {
+ /* unable to get the current directory */
+ strcpy(path, p);
+ return;
+ }
+ 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 && progpath[0] != '\0')
+ 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, progpath, 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
+
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