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Issue #3080: Create find_module_path() subfunction
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Victor Stinner
parent
3758028299
commit
d68c2cf237
228
Python/import.c
228
Python/import.c
@ -1598,6 +1598,129 @@ static int case_ok(char *, Py_ssize_t, Py_ssize_t, const char *);
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static int find_init_module(char *); /* Forward */
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static struct filedescr importhookdescr = {"", "", IMP_HOOK};
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/* Get the path of a module: get its importer and call importer.find_module()
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hook, or check if the module if a package (if path/__init__.py exists).
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-1: error: a Python error occurred
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0: ignore: an error occurred because of invalid data, but the error is not
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important enough to be reported.
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1: get path: module not found, but *buf contains its path
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2: found: *p_fd is the file descriptor (IMP_HOOK or PKG_DIRECTORY)
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and *buf is the path */
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static int
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find_module_path(char *fullname, const char *name, PyObject *path,
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PyObject *path_hooks, PyObject *path_importer_cache,
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char *buf, size_t buflen,
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PyObject **p_loader, struct filedescr **p_fd)
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{
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PyObject *path_bytes;
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const char *base;
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Py_ssize_t len;
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size_t namelen;
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struct stat statbuf;
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static struct filedescr fd_package = {"", "", PKG_DIRECTORY};
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if (PyUnicode_Check(path)) {
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path_bytes = PyUnicode_EncodeFSDefault(path);
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if (path_bytes == NULL)
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return -1;
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}
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else if (PyBytes_Check(path)) {
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Py_INCREF(path);
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path_bytes = path;
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}
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else
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return 0;
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namelen = strlen(name);
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base = PyBytes_AS_STRING(path_bytes);
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len = PyBytes_GET_SIZE(path_bytes);
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if (len + 2 + namelen + MAXSUFFIXSIZE >= buflen) {
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Py_DECREF(path_bytes);
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return 0; /* Too long */
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}
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strcpy(buf, base);
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Py_DECREF(path_bytes);
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if (strlen(buf) != len) {
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return 0; /* path_bytes contains '\0' */
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}
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/* sys.path_hooks import hook */
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if (p_loader != NULL) {
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PyObject *importer;
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importer = get_path_importer(path_importer_cache,
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path_hooks, path);
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if (importer == NULL) {
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return -1;
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}
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/* Note: importer is a borrowed reference */
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if (importer != Py_None) {
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PyObject *loader;
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loader = PyObject_CallMethod(importer,
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"find_module",
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"s", fullname);
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if (loader == NULL)
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return -1; /* error */
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if (loader != Py_None) {
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/* a loader was found */
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*p_loader = loader;
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*p_fd = &importhookdescr;
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return 2;
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}
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Py_DECREF(loader);
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return 0;
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}
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}
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/* no hook was found, use builtin import */
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if (len > 0 && buf[len-1] != SEP
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#ifdef ALTSEP
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&& buf[len-1] != ALTSEP
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#endif
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)
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buf[len++] = SEP;
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strcpy(buf+len, name);
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len += namelen;
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/* Check for package import (buf holds a directory name,
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and there's an __init__ module in that directory */
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#ifdef HAVE_STAT
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if (stat(buf, &statbuf) == 0 && /* it exists */
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S_ISDIR(statbuf.st_mode) && /* it's a directory */
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case_ok(buf, len, namelen, name)) { /* case matches */
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if (find_init_module(buf)) { /* and has __init__.py */
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*p_fd = &fd_package;
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return 2;
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}
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else {
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int err;
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PyObject *unicode = PyUnicode_DecodeFSDefault(buf);
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if (unicode == NULL)
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return -1;
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err = PyErr_WarnFormat(PyExc_ImportWarning, 1,
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"Not importing directory '%U': missing __init__.py",
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unicode);
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Py_DECREF(unicode);
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if (err)
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return -1;
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}
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}
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#endif
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return 1;
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}
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/* Find a module in search_path_list. For each path, try
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find_module_filename() or try each _PyImport_Filetab suffix.
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If the module is found, return a file descriptor, write the path in
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*p_filename, write the pointer to the file object into *p_fp, and (if
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p_loader is not NULL) the loader into *p_loader.
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Otherwise, raise an exception and return NULL. */
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static struct filedescr*
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find_module_path_list(char *fullname, const char *name,
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PyObject *search_path_list, PyObject *path_hooks,
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@ -1610,8 +1733,6 @@ find_module_path_list(char *fullname, const char *name,
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struct filedescr *fdp = NULL;
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char *filemode;
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FILE *fp = NULL;
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struct stat statbuf;
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static struct filedescr fd_package = {"", "", PKG_DIRECTORY};
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#if defined(PYOS_OS2)
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size_t saved_len;
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size_t saved_namelen;
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@ -1621,96 +1742,25 @@ find_module_path_list(char *fullname, const char *name,
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npath = PyList_Size(search_path_list);
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namelen = strlen(name);
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for (i = 0; i < npath; i++) {
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PyObject *v = PyList_GetItem(search_path_list, i);
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PyObject *origv = v;
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const char *base;
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Py_ssize_t size;
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if (!v)
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PyObject *path;
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int ok;
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path = PyList_GetItem(search_path_list, i);
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if (path == NULL)
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return NULL;
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if (PyUnicode_Check(v)) {
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v = PyUnicode_EncodeFSDefault(v);
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if (v == NULL)
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return NULL;
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}
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else if (!PyBytes_Check(v))
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ok = find_module_path(fullname, name, path,
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path_hooks, path_importer_cache,
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buf, buflen,
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p_loader, &fdp);
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if (ok < 0)
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return NULL;
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if (ok == 0)
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continue;
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else
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Py_INCREF(v);
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if (ok == 2)
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return fdp;
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base = PyBytes_AS_STRING(v);
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size = PyBytes_GET_SIZE(v);
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len = size;
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if (len + 2 + namelen + MAXSUFFIXSIZE >= buflen) {
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Py_DECREF(v);
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continue; /* Too long */
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}
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strcpy(buf, base);
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Py_DECREF(v);
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if (strlen(buf) != len) {
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continue; /* v contains '\0' */
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}
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/* sys.path_hooks import hook */
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if (p_loader != NULL) {
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PyObject *importer;
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importer = get_path_importer(path_importer_cache,
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path_hooks, origv);
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if (importer == NULL) {
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return NULL;
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}
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/* Note: importer is a borrowed reference */
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if (importer != Py_None) {
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PyObject *loader;
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loader = PyObject_CallMethod(importer,
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"find_module",
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"s", fullname);
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if (loader == NULL)
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return NULL; /* error */
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if (loader != Py_None) {
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/* a loader was found */
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*p_loader = loader;
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return &importhookdescr;
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}
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Py_DECREF(loader);
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continue;
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}
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}
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/* no hook was found, use builtin import */
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if (len > 0 && buf[len-1] != SEP
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#ifdef ALTSEP
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&& buf[len-1] != ALTSEP
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#endif
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)
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buf[len++] = SEP;
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strcpy(buf+len, name);
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len += namelen;
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/* Check for package import (buf holds a directory name,
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and there's an __init__ module in that directory */
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#ifdef HAVE_STAT
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if (stat(buf, &statbuf) == 0 && /* it exists */
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S_ISDIR(statbuf.st_mode) && /* it's a directory */
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case_ok(buf, len, namelen, name)) { /* case matches */
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if (find_init_module(buf)) { /* and has __init__.py */
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return &fd_package;
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}
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else {
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int err;
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PyObject *unicode = PyUnicode_DecodeFSDefault(buf);
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if (unicode == NULL)
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return NULL;
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err = PyErr_WarnFormat(PyExc_ImportWarning, 1,
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"Not importing directory '%U': missing __init__.py",
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unicode);
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Py_DECREF(unicode);
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if (err)
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return NULL;
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}
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}
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#endif
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len = strlen(buf);
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#if defined(PYOS_OS2)
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/* take a snapshot of the module spec for restoration
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* after the 8 character DLL hackery
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