cpython/Python/modsupport.c at 18e165558b24d29e7e0ca501842b9236589b012a · python/cpython · GitHub

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/* Module support implementation */

#include "Python.h"

typedef double va_double;

/* Package context -- the full module name for package imports */

char *_Py_PackageContext = NULL;

/* Py_InitModule4() parameters:

- name is the module name

- methods is the list of top-level functions

- doc is the documentation string

- passthrough is passed as self to functions defined in the module

- api_version is the value of PYTHON_API_VERSION at the time the

module was compiled

Return value is a borrowed reference to the module object; or NULL

if an error occurred (in Python 1.4 and before, errors were fatal).

Errors may still leak memory.

static char api_version_warning[] =

"Python C API version mismatch for module %.100s:\

This Python has API version %d, module %.100s has version %d.";

PyObject *

Py_InitModule4(const char *name, PyMethodDef *methods, const char *doc,

PyObject *passthrough, int module_api_version)

{

PyObject *m, *d, *v, *n;

PyMethodDef *ml;

if (!Py_IsInitialized())

Py_FatalError("Interpreter not initialized (version mismatch?)");

if (module_api_version != PYTHON_API_VERSION) {

char message[512];

PyOS_snprintf(message, sizeof(message),

api_version_warning, name,

PYTHON_API_VERSION, name,

module_api_version);

if (PyErr_Warn(PyExc_RuntimeWarning, message))

return NULL;

}

/* Make sure name is fully qualified.

This is a bit of a hack: when the shared library is loaded,

the module name is "package.module", but the module calls

Py_InitModule*() with just "module" for the name. The shared

library loader squirrels away the true name of the module in

_Py_PackageContext, and Py_InitModule*() will substitute this

(if the name actually matches).

if (_Py_PackageContext != NULL) {

char *p = strrchr(_Py_PackageContext, '.');

if (p != NULL && strcmp(name, p+1) == 0) {

name = _Py_PackageContext;

_Py_PackageContext = NULL;

}

if ((m = PyImport_AddModule(name)) == NULL)

return NULL;

d = PyModule_GetDict(m);

if (methods != NULL) {

n = PyString_FromString(name);

if (n == NULL)

return NULL;

for (ml = methods; ml->ml_name != NULL; ml++) {

if ((ml->ml_flags & METH_CLASS) ||

(ml->ml_flags & METH_STATIC)) {

PyErr_SetString(PyExc_ValueError,

"module functions cannot set"

" METH_CLASS or METH_STATIC");

return NULL;

}

v = PyCFunction_NewEx(ml, passthrough, n);

if (v == NULL)

return NULL;

if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {

Py_DECREF(v);

return NULL;

}

Py_DECREF(v);

}

Py_DECREF(n);

}

if (doc != NULL) {

v = PyString_FromString(doc);

if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {

Py_XDECREF(v);

return NULL;

}

Py_DECREF(v);

}

return m;

}

/* Helper for mkvalue() to scan the length of a format */

static int

countformat(const char *format, int endchar)

{

int count = 0;

int level = 0;

while (level > 0 || *format != endchar) {

switch (*format) {

case '\0':

/* Premature end */

PyErr_SetString(PyExc_SystemError,

"unmatched paren in format");

return -1;

case '(':

case '[':

case '{':

if (level == 0)

count++;

level++;

break;

case ')':

case ']':

case '}':

level--;

break;

case '#':

case '&':

case ',':

case ':':

case ' ':

case '\t':

break;

default:

if (level == 0)

count++;

}

format++;

}

return count;

}

/* Generic function to create a value -- the inverse of getargs() */

/* After an original idea and first implementation by Steven Miale */

static PyObject *do_mktuple(const char**, va_list *, int, int);

static PyObject *do_mklist(const char**, va_list *, int, int);

static PyObject *do_mkdict(const char**, va_list *, int, int);

static PyObject *do_mkvalue(const char**, va_list *);

static PyObject *

do_mkdict(const char **p_format, va_list *p_va, int endchar, int n)

{

PyObject *d;

int i;

int itemfailed = 0;

if (n < 0)

return NULL;

if ((d = PyDict_New()) == NULL)

return NULL;

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

for (i = 0; i < n; i+= 2) {

PyObject *k, *v;

int err;

k = do_mkvalue(p_format, p_va);

if (k == NULL) {

itemfailed = 1;

Py_INCREF(Py_None);

k = Py_None;

}

v = do_mkvalue(p_format, p_va);

if (v == NULL) {

itemfailed = 1;

Py_INCREF(Py_None);

v = Py_None;

}

err = PyDict_SetItem(d, k, v);

Py_DECREF(k);

Py_DECREF(v);

if (err < 0 || itemfailed) {

Py_DECREF(d);

return NULL;

}

if (d != NULL && **p_format != endchar) {

Py_DECREF(d);

d = NULL;

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

}

else if (endchar)

++*p_format;

return d;

}

static PyObject *

do_mklist(const char **p_format, va_list *p_va, int endchar, int n)

{

PyObject *v;

int i;

int itemfailed = 0;

if (n < 0)

return NULL;

if ((v = PyList_New(n)) == NULL)

return NULL;

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

for (i = 0; i < n; i++) {

PyObject *w = do_mkvalue(p_format, p_va);

if (w == NULL) {

itemfailed = 1;

Py_INCREF(Py_None);

w = Py_None;

}

PyList_SetItem(v, i, w);

}

if (v != NULL && **p_format != endchar) {

Py_DECREF(v);

v = NULL;

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

}

else if (endchar)

++*p_format;

if (itemfailed) {

Py_DECREF(v);

v = NULL;

}

return v;

}

#ifdef Py_USING_UNICODE

static int

_ustrlen(Py_UNICODE *u)

{

int i = 0;

Py_UNICODE *v = u;

while (*v != 0) { i++; v++; }

return i;

}

#endif

static PyObject *

do_mktuple(const char **p_format, va_list *p_va, int endchar, int n)

{

PyObject *v;

int i;

int itemfailed = 0;

if (n < 0)

return NULL;

if ((v = PyTuple_New(n)) == NULL)

return NULL;

/* Note that we can't bail immediately on error as this will leak

refcounts on any 'N' arguments. */

for (i = 0; i < n; i++) {

PyObject *w = do_mkvalue(p_format, p_va);

if (w == NULL) {

itemfailed = 1;

Py_INCREF(Py_None);

w = Py_None;

}

PyTuple_SetItem(v, i, w);

}

if (v != NULL && **p_format != endchar) {

Py_DECREF(v);

v = NULL;

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

}

else if (endchar)

++*p_format;

if (itemfailed) {

Py_DECREF(v);

v = NULL;

}

return v;

}

static PyObject *

do_mkvalue(const char **p_format, va_list *p_va)

{

for (;;) {

switch (*(*p_format)++) {

case '(':

return do_mktuple(p_format, p_va, ')',

countformat(*p_format, ')'));

case '[':

return do_mklist(p_format, p_va, ']',

countformat(*p_format, ']'));

case '{':

return do_mkdict(p_format, p_va, '}',

countformat(*p_format, '}'));

case 'b':

case 'B':

case 'h':

case 'i':

return PyInt_FromLong((long)va_arg(*p_va, int));

case 'H':

return PyInt_FromLong((long)va_arg(*p_va, unsigned int));

case 'I':

{

unsigned int n;

n = va_arg(*p_va, unsigned int);

if (n > (unsigned long)PyInt_GetMax())

return PyLong_FromUnsignedLong((unsigned long)n);

else

return PyInt_FromLong(n);

}

case 'n':

#if SIZEOF_SIZE_T!=SIZEOF_LONG

return PyLong_FromSsize_t(va_arg(*p_va, Py_Ssize_t));

#endif

/* Fall through from 'n' to 'l' if Py_ssize_t is long */

case 'l':

return PyInt_FromLong(va_arg(*p_va, long));

case 'k':

{

unsigned long n;

n = va_arg(*p_va, unsigned long);

if (n > (unsigned long)PyInt_GetMax())

return PyLong_FromUnsignedLong(n);

else

return PyInt_FromLong(n);

}

#ifdef HAVE_LONG_LONG

case 'L':

return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, PY_LONG_LONG));

case 'K':

return PyLong_FromUnsignedLongLong((PY_LONG_LONG)va_arg(*p_va, unsigned PY_LONG_LONG));

#endif

#ifdef Py_USING_UNICODE

case 'u':

{

PyObject *v;

Py_UNICODE *u = va_arg(*p_va, Py_UNICODE *);

int n;

if (**p_format == '#') {

++*p_format;

n = va_arg(*p_va, int);

}

else

n = -1;

if (u == NULL) {

v = Py_None;

Py_INCREF(v);

}

else {

if (n < 0)

n = _ustrlen(u);

v = PyUnicode_FromUnicode(u, n);

}

return v;

}

#endif

case 'f':

case 'd':

return PyFloat_FromDouble(

(double)va_arg(*p_va, va_double));

#ifndef WITHOUT_COMPLEX

case 'D':

return PyComplex_FromCComplex(

*((Py_complex *)va_arg(*p_va, Py_complex *)));

#endif /* WITHOUT_COMPLEX */

case 'c':

{

char p[1];

p[0] = (char)va_arg(*p_va, int);

return PyString_FromStringAndSize(p, 1);

}

case 's':

case 'z':

{

PyObject *v;

char *str = va_arg(*p_va, char *);

int n;

if (**p_format == '#') {

++*p_format;

n = va_arg(*p_va, int);

}

else

n = -1;

if (str == NULL) {

v = Py_None;

Py_INCREF(v);

}

else {

if (n < 0) {

size_t m = strlen(str);

if (m > INT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"string too long for Python string");

return NULL;

}

n = (int)m;

}

v = PyString_FromStringAndSize(str, n);

}

return v;

}

case 'N':

case 'S':

case 'O':

if (**p_format == '&') {

typedef PyObject *(*converter)(void *);

converter func = va_arg(*p_va, converter);

void *arg = va_arg(*p_va, void *);

++*p_format;

return (*func)(arg);

}

else {

PyObject *v;

v = va_arg(*p_va, PyObject *);

if (v != NULL) {

if (*(*p_format - 1) != 'N')

Py_INCREF(v);

}

else if (!PyErr_Occurred())

/* If a NULL was passed

* because a call that should

* have constructed a value

* failed, that's OK, and we

* pass the error on; but if

* no error occurred it's not

* clear that the caller knew

* what she was doing. */

PyErr_SetString(PyExc_SystemError,

"NULL object passed to Py_BuildValue");

return v;

}

case ':':

case ',':

case ' ':

case '\t':

break;

default:

PyErr_SetString(PyExc_SystemError,

"bad format char passed to Py_BuildValue");

return NULL;

}

PyObject *

Py_BuildValue(const char *format, ...)

{

va_list va;

PyObject* retval;

va_start(va, format);

retval = Py_VaBuildValue(format, va);

va_end(va);

return retval;

}

PyObject *

Py_VaBuildValue(const char *format, va_list va)

{

const char *f = format;

int n = countformat(f, '\0');

va_list lva;

#ifdef VA_LIST_IS_ARRAY

memcpy(lva, va, sizeof(va_list));

#else

#ifdef __va_copy

__va_copy(lva, va);

#else

lva = va;

#endif

if (n < 0)

return NULL;

if (n == 0) {

Py_INCREF(Py_None);

return Py_None;

}

if (n == 1)

return do_mkvalue(&f, &lva);

return do_mktuple(&f, &lva, '\0', n);

}

PyObject *

PyEval_CallFunction(PyObject *obj, const char *format, ...)

{

va_list vargs;

PyObject *args;

PyObject *res;

va_start(vargs, format);

args = Py_VaBuildValue(format, vargs);

va_end(vargs);

if (args == NULL)

return NULL;

res = PyEval_CallObject(obj, args);

Py_DECREF(args);

return res;

}

PyObject *

PyEval_CallMethod(PyObject *obj, const char *methodname, const char *format, ...)

{

va_list vargs;

PyObject *meth;

PyObject *args;

PyObject *res;

meth = PyObject_GetAttrString(obj, methodname);

if (meth == NULL)

return NULL;

va_start(vargs, format);

args = Py_VaBuildValue(format, vargs);

va_end(vargs);

if (args == NULL) {

Py_DECREF(meth);

return NULL;

}

res = PyEval_CallObject(meth, args);

Py_DECREF(meth);

Py_DECREF(args);

return res;

}

int

PyModule_AddObject(PyObject *m, const char *name, PyObject *o)

{

PyObject *dict;

if (!PyModule_Check(m)) {

PyErr_SetString(PyExc_TypeError,

"PyModule_AddObject() needs module as first arg");

return -1;

}

if (!o) {

if (!PyErr_Occurred())

PyErr_SetString(PyExc_TypeError,

"PyModule_AddObject() needs non-NULL value");

return -1;

}

dict = PyModule_GetDict(m);

if (dict == NULL) {

/* Internal error -- modules must have a dict! */

PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__",

PyModule_GetName(m));

return -1;

}

if (PyDict_SetItemString(dict, name, o))

return -1;

Py_DECREF(o);

return 0;

}

int

PyModule_AddIntConstant(PyObject *m, const char *name, long value)

{

return PyModule_AddObject(m, name, PyInt_FromLong(value));

}

int

PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)

{

return PyModule_AddObject(m, name, PyString_FromString(value));

}

cpython/Python/modsupport.c at 18e165558b24d29e7e0ca501842b9236589b012a · python/cpython · GitHub

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