mirror of
https://github.com/python/cpython.git
synced 2024-11-28 16:45:42 +01:00
546 lines
11 KiB
C
546 lines
11 KiB
C
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/* Module support implementation */
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#include "Python.h"
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#ifdef MPW /* MPW pushes 'extended' for float and double types with varargs */
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typedef extended va_double;
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#else
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typedef double va_double;
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#endif
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/* Package context -- the full module name for package imports */
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char *_Py_PackageContext = NULL;
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/* Py_InitModule4() parameters:
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- name is the module name
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- methods is the list of top-level functions
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- doc is the documentation string
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- passthrough is passed as self to functions defined in the module
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- api_version is the value of PYTHON_API_VERSION at the time the
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module was compiled
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Return value is a borrowed reference to the module object; or NULL
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if an error occurred (in Python 1.4 and before, errors were fatal).
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Errors may still leak memory.
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*/
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static char api_version_warning[] =
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"Python C API version mismatch for module %.100s:\
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This Python has API version %d, module %.100s has version %d.";
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PyObject *
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Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
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PyObject *passthrough, int module_api_version)
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{
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PyObject *m, *d, *v, *n;
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PyMethodDef *ml;
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if (!Py_IsInitialized())
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Py_FatalError("Interpreter not initialized (version mismatch?)");
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if (module_api_version != PYTHON_API_VERSION) {
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char message[512];
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PyOS_snprintf(message, sizeof(message),
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api_version_warning, name,
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PYTHON_API_VERSION, name,
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module_api_version);
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if (PyErr_Warn(PyExc_RuntimeWarning, message))
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return NULL;
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}
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/* Make sure name is fully qualified.
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This is a bit of a hack: when the shared library is loaded,
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the module name is "package.module", but the module calls
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Py_InitModule*() with just "module" for the name. The shared
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library loader squirrels away the true name of the module in
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_Py_PackageContext, and Py_InitModule*() will substitute this
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(if the name actually matches).
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*/
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if (_Py_PackageContext != NULL) {
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char *p = strrchr(_Py_PackageContext, '.');
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if (p != NULL && strcmp(name, p+1) == 0) {
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name = _Py_PackageContext;
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_Py_PackageContext = NULL;
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}
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}
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if ((m = PyImport_AddModule(name)) == NULL)
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return NULL;
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d = PyModule_GetDict(m);
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if (methods != NULL) {
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n = PyString_FromString(name);
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if (n == NULL)
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return NULL;
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for (ml = methods; ml->ml_name != NULL; ml++) {
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if ((ml->ml_flags & METH_CLASS) ||
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(ml->ml_flags & METH_STATIC)) {
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PyErr_SetString(PyExc_ValueError,
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"module functions cannot set"
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" METH_CLASS or METH_STATIC");
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return NULL;
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}
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v = PyCFunction_NewEx(ml, passthrough, n);
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if (v == NULL)
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return NULL;
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if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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Py_DECREF(v);
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return NULL;
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}
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Py_DECREF(v);
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}
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}
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if (doc != NULL) {
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v = PyString_FromString(doc);
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if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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Py_XDECREF(v);
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return NULL;
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}
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Py_DECREF(v);
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}
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return m;
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}
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/* Helper for mkvalue() to scan the length of a format */
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static int
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countformat(char *format, int endchar)
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{
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int count = 0;
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int level = 0;
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while (level > 0 || *format != endchar) {
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switch (*format) {
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case '\0':
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/* Premature end */
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PyErr_SetString(PyExc_SystemError,
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"unmatched paren in format");
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return -1;
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case '(':
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case '[':
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case '{':
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if (level == 0)
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count++;
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level++;
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break;
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case ')':
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case ']':
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case '}':
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level--;
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break;
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case '#':
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case '&':
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case ',':
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case ':':
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case ' ':
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case '\t':
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break;
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default:
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if (level == 0)
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count++;
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}
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format++;
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}
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return count;
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}
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/* Generic function to create a value -- the inverse of getargs() */
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/* After an original idea and first implementation by Steven Miale */
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static PyObject *do_mktuple(char**, va_list *, int, int);
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static PyObject *do_mklist(char**, va_list *, int, int);
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static PyObject *do_mkdict(char**, va_list *, int, int);
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static PyObject *do_mkvalue(char**, va_list *);
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static PyObject *
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do_mkdict(char **p_format, va_list *p_va, int endchar, int n)
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{
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PyObject *d;
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int i;
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if (n < 0)
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return NULL;
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if ((d = PyDict_New()) == NULL)
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return NULL;
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for (i = 0; i < n; i+= 2) {
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PyObject *k, *v;
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int err;
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k = do_mkvalue(p_format, p_va);
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if (k == NULL) {
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Py_DECREF(d);
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return NULL;
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}
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v = do_mkvalue(p_format, p_va);
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if (v == NULL) {
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Py_DECREF(k);
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Py_DECREF(d);
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return NULL;
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}
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err = PyDict_SetItem(d, k, v);
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Py_DECREF(k);
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Py_DECREF(v);
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if (err < 0) {
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Py_DECREF(d);
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return NULL;
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}
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}
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if (d != NULL && **p_format != endchar) {
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Py_DECREF(d);
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d = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return d;
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}
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static PyObject *
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do_mklist(char **p_format, va_list *p_va, int endchar, int n)
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{
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PyObject *v;
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int i;
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if (n < 0)
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return NULL;
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if ((v = PyList_New(n)) == NULL)
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va);
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if (w == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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PyList_SetItem(v, i, w);
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}
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if (v != NULL && **p_format != endchar) {
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Py_DECREF(v);
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v = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return v;
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}
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#ifdef Py_USING_UNICODE
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static int
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_ustrlen(Py_UNICODE *u)
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{
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int i = 0;
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Py_UNICODE *v = u;
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while (*v != 0) { i++; v++; }
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return i;
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}
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#endif
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static PyObject *
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do_mktuple(char **p_format, va_list *p_va, int endchar, int n)
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{
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PyObject *v;
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int i;
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if (n < 0)
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return NULL;
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if ((v = PyTuple_New(n)) == NULL)
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va);
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if (w == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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PyTuple_SetItem(v, i, w);
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}
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if (v != NULL && **p_format != endchar) {
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Py_DECREF(v);
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v = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return v;
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}
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static PyObject *
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do_mkvalue(char **p_format, va_list *p_va)
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{
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for (;;) {
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switch (*(*p_format)++) {
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case '(':
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return do_mktuple(p_format, p_va, ')',
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countformat(*p_format, ')'));
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case '[':
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return do_mklist(p_format, p_va, ']',
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countformat(*p_format, ']'));
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case '{':
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return do_mkdict(p_format, p_va, '}',
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countformat(*p_format, '}'));
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case 'b':
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case 'B':
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case 'h':
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case 'i':
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return PyInt_FromLong((long)va_arg(*p_va, int));
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case 'H':
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return PyInt_FromLong((long)va_arg(*p_va, unsigned int));
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case 'l':
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return PyInt_FromLong((long)va_arg(*p_va, long));
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case 'k':
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return PyInt_FromLong((long)va_arg(*p_va, unsigned long));
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#ifdef HAVE_LONG_LONG
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case 'L':
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return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, PY_LONG_LONG));
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case 'K':
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return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, unsigned PY_LONG_LONG));
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#endif
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#ifdef Py_USING_UNICODE
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case 'u':
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{
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PyObject *v;
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Py_UNICODE *u = va_arg(*p_va, Py_UNICODE *);
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int n;
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if (**p_format == '#') {
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++*p_format;
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n = va_arg(*p_va, int);
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}
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else
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n = -1;
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if (u == NULL) {
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v = Py_None;
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Py_INCREF(v);
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}
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else {
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if (n < 0)
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n = _ustrlen(u);
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v = PyUnicode_FromUnicode(u, n);
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}
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return v;
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}
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#endif
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case 'f':
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case 'd':
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return PyFloat_FromDouble(
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(double)va_arg(*p_va, va_double));
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#ifndef WITHOUT_COMPLEX
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case 'D':
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return PyComplex_FromCComplex(
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*((Py_complex *)va_arg(*p_va, Py_complex *)));
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#endif /* WITHOUT_COMPLEX */
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case 'c':
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{
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char p[1];
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p[0] = va_arg(*p_va, int);
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return PyString_FromStringAndSize(p, 1);
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}
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case 's':
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case 'z':
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{
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PyObject *v;
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char *str = va_arg(*p_va, char *);
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int n;
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if (**p_format == '#') {
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++*p_format;
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n = va_arg(*p_va, int);
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}
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else
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n = -1;
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if (str == NULL) {
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v = Py_None;
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Py_INCREF(v);
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}
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else {
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if (n < 0) {
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size_t m = strlen(str);
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if (m > INT_MAX) {
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PyErr_SetString(PyExc_OverflowError,
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"string too long for Python string");
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return NULL;
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}
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n = (int)m;
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}
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v = PyString_FromStringAndSize(str, n);
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}
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return v;
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}
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case 'N':
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case 'S':
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case 'O':
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if (**p_format == '&') {
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typedef PyObject *(*converter)(void *);
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converter func = va_arg(*p_va, converter);
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void *arg = va_arg(*p_va, void *);
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++*p_format;
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return (*func)(arg);
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}
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else {
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PyObject *v;
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v = va_arg(*p_va, PyObject *);
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if (v != NULL) {
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if (*(*p_format - 1) != 'N')
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Py_INCREF(v);
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}
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else if (!PyErr_Occurred())
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/* If a NULL was passed
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* because a call that should
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* have constructed a value
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* failed, that's OK, and we
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* pass the error on; but if
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* no error occurred it's not
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* clear that the caller knew
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* what she was doing. */
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PyErr_SetString(PyExc_SystemError,
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"NULL object passed to Py_BuildValue");
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return v;
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}
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case ':':
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case ',':
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case ' ':
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case '\t':
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break;
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default:
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PyErr_SetString(PyExc_SystemError,
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"bad format char passed to Py_BuildValue");
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return NULL;
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}
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}
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}
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PyObject *
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Py_BuildValue(char *format, ...)
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{
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va_list va;
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PyObject* retval;
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va_start(va, format);
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retval = Py_VaBuildValue(format, va);
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va_end(va);
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return retval;
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}
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PyObject *
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Py_VaBuildValue(char *format, va_list va)
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{
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char *f = format;
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int n = countformat(f, '\0');
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va_list lva;
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#ifdef VA_LIST_IS_ARRAY
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memcpy(lva, va, sizeof(va_list));
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#else
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#ifdef __va_copy
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__va_copy(lva, va);
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#else
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lva = va;
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#endif
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#endif
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if (n < 0)
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return NULL;
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if (n == 0) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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if (n == 1)
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return do_mkvalue(&f, &lva);
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return do_mktuple(&f, &lva, '\0', n);
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}
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PyObject *
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PyEval_CallFunction(PyObject *obj, char *format, ...)
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{
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va_list vargs;
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PyObject *args;
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PyObject *res;
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va_start(vargs, format);
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args = Py_VaBuildValue(format, vargs);
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va_end(vargs);
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if (args == NULL)
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return NULL;
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res = PyEval_CallObject(obj, args);
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Py_DECREF(args);
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return res;
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}
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PyObject *
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PyEval_CallMethod(PyObject *obj, char *methodname, char *format, ...)
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{
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va_list vargs;
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PyObject *meth;
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PyObject *args;
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PyObject *res;
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meth = PyObject_GetAttrString(obj, methodname);
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if (meth == NULL)
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return NULL;
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va_start(vargs, format);
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args = Py_VaBuildValue(format, vargs);
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va_end(vargs);
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if (args == NULL) {
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Py_DECREF(meth);
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return NULL;
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}
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res = PyEval_CallObject(meth, args);
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Py_DECREF(meth);
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Py_DECREF(args);
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return res;
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}
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int
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PyModule_AddObject(PyObject *m, char *name, PyObject *o)
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{
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PyObject *dict;
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if (!PyModule_Check(m) || o == NULL) {
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PyErr_SetString(PyExc_TypeError,
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"PyModule_AddObject() needs module as first arg");
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return -1;
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}
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dict = PyModule_GetDict(m);
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if (dict == NULL) {
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/* Internal error -- modules must have a dict! */
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PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__",
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PyModule_GetName(m));
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return -1;
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}
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if (PyDict_SetItemString(dict, name, o))
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return -1;
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Py_DECREF(o);
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return 0;
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}
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int
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PyModule_AddIntConstant(PyObject *m, char *name, long value)
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{
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return PyModule_AddObject(m, name, PyInt_FromLong(value));
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}
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int
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PyModule_AddStringConstant(PyObject *m, char *name, char *value)
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{
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return PyModule_AddObject(m, name, PyString_FromString(value));
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}
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