mirror of
https://github.com/python/cpython.git
synced 2024-11-25 02:44:06 +08:00
576 lines
14 KiB
C
576 lines
14 KiB
C
|
|
/* Module support implementation */
|
|
|
|
#include "Python.h"
|
|
|
|
#define FLAG_SIZE_T 1
|
|
typedef double va_double;
|
|
|
|
static PyObject *va_build_value(const char *, va_list, int);
|
|
|
|
/* Package context -- the full module name for package imports */
|
|
char *_Py_PackageContext = NULL;
|
|
|
|
/* 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, int);
|
|
static PyObject *do_mklist(const char**, va_list *, int, int, int);
|
|
static PyObject *do_mkdict(const char**, va_list *, int, int, int);
|
|
static PyObject *do_mkvalue(const char**, va_list *, int);
|
|
|
|
|
|
static PyObject *
|
|
do_mkdict(const char **p_format, va_list *p_va, int endchar, int n, int flags)
|
|
{
|
|
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, flags);
|
|
if (k == NULL) {
|
|
itemfailed = 1;
|
|
Py_INCREF(Py_None);
|
|
k = Py_None;
|
|
}
|
|
v = do_mkvalue(p_format, p_va, flags);
|
|
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, int flags)
|
|
{
|
|
PyObject *v;
|
|
int i;
|
|
int itemfailed = 0;
|
|
if (n < 0)
|
|
return NULL;
|
|
v = PyList_New(n);
|
|
if (v == 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, flags);
|
|
if (w == NULL) {
|
|
itemfailed = 1;
|
|
Py_INCREF(Py_None);
|
|
w = Py_None;
|
|
}
|
|
PyList_SET_ITEM(v, i, w);
|
|
}
|
|
|
|
if (itemfailed) {
|
|
/* do_mkvalue() should have already set an error */
|
|
Py_DECREF(v);
|
|
return NULL;
|
|
}
|
|
if (**p_format != endchar) {
|
|
Py_DECREF(v);
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"Unmatched paren in format");
|
|
return NULL;
|
|
}
|
|
if (endchar)
|
|
++*p_format;
|
|
return v;
|
|
}
|
|
|
|
static int
|
|
_ustrlen(Py_UNICODE *u)
|
|
{
|
|
int i = 0;
|
|
Py_UNICODE *v = u;
|
|
while (*v != 0) { i++; v++; }
|
|
return i;
|
|
}
|
|
|
|
static PyObject *
|
|
do_mktuple(const char **p_format, va_list *p_va, int endchar, int n, int flags)
|
|
{
|
|
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, flags);
|
|
if (w == NULL) {
|
|
itemfailed = 1;
|
|
Py_INCREF(Py_None);
|
|
w = Py_None;
|
|
}
|
|
PyTuple_SET_ITEM(v, i, w);
|
|
}
|
|
if (itemfailed) {
|
|
/* do_mkvalue() should have already set an error */
|
|
Py_DECREF(v);
|
|
return NULL;
|
|
}
|
|
if (**p_format != endchar) {
|
|
Py_DECREF(v);
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"Unmatched paren in format");
|
|
return NULL;
|
|
}
|
|
if (endchar)
|
|
++*p_format;
|
|
return v;
|
|
}
|
|
|
|
static PyObject *
|
|
do_mkvalue(const char **p_format, va_list *p_va, int flags)
|
|
{
|
|
for (;;) {
|
|
switch (*(*p_format)++) {
|
|
case '(':
|
|
return do_mktuple(p_format, p_va, ')',
|
|
countformat(*p_format, ')'), flags);
|
|
|
|
case '[':
|
|
return do_mklist(p_format, p_va, ']',
|
|
countformat(*p_format, ']'), flags);
|
|
|
|
case '{':
|
|
return do_mkdict(p_format, p_va, '}',
|
|
countformat(*p_format, '}'), flags);
|
|
|
|
case 'b':
|
|
case 'B':
|
|
case 'h':
|
|
case 'i':
|
|
return PyLong_FromLong((long)va_arg(*p_va, int));
|
|
|
|
case 'H':
|
|
return PyLong_FromLong((long)va_arg(*p_va, unsigned int));
|
|
|
|
case 'I':
|
|
{
|
|
unsigned int n;
|
|
n = va_arg(*p_va, unsigned int);
|
|
return PyLong_FromUnsignedLong(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 PyLong_FromLong(va_arg(*p_va, long));
|
|
|
|
case 'k':
|
|
{
|
|
unsigned long n;
|
|
n = va_arg(*p_va, unsigned long);
|
|
return PyLong_FromUnsignedLong(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
|
|
case 'u':
|
|
{
|
|
PyObject *v;
|
|
Py_UNICODE *u = va_arg(*p_va, Py_UNICODE *);
|
|
Py_ssize_t n;
|
|
if (**p_format == '#') {
|
|
++*p_format;
|
|
if (flags & FLAG_SIZE_T)
|
|
n = va_arg(*p_va, Py_ssize_t);
|
|
else
|
|
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;
|
|
}
|
|
case 'f':
|
|
case 'd':
|
|
return PyFloat_FromDouble(
|
|
(double)va_arg(*p_va, va_double));
|
|
|
|
case 'D':
|
|
return PyComplex_FromCComplex(
|
|
*((Py_complex *)va_arg(*p_va, Py_complex *)));
|
|
|
|
case 'c':
|
|
{
|
|
char p[1];
|
|
p[0] = (char)va_arg(*p_va, int);
|
|
return PyBytes_FromStringAndSize(p, 1);
|
|
}
|
|
case 'C':
|
|
{
|
|
int i = va_arg(*p_va, int);
|
|
if (i < 0 || i > PyUnicode_GetMax()) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"%c arg not in range(0x110000)");
|
|
return NULL;
|
|
}
|
|
return PyUnicode_FromOrdinal(i);
|
|
}
|
|
|
|
case 's':
|
|
case 'z':
|
|
case 'U': /* XXX deprecated alias */
|
|
{
|
|
PyObject *v;
|
|
char *str = va_arg(*p_va, char *);
|
|
Py_ssize_t n;
|
|
if (**p_format == '#') {
|
|
++*p_format;
|
|
if (flags & FLAG_SIZE_T)
|
|
n = va_arg(*p_va, Py_ssize_t);
|
|
else
|
|
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 > PY_SSIZE_T_MAX) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"string too long for Python string");
|
|
return NULL;
|
|
}
|
|
n = (Py_ssize_t)m;
|
|
}
|
|
v = PyUnicode_FromStringAndSize(str, n);
|
|
}
|
|
return v;
|
|
}
|
|
|
|
case 'y':
|
|
{
|
|
PyObject *v;
|
|
char *str = va_arg(*p_va, char *);
|
|
Py_ssize_t n;
|
|
if (**p_format == '#') {
|
|
++*p_format;
|
|
if (flags & FLAG_SIZE_T)
|
|
n = va_arg(*p_va, Py_ssize_t);
|
|
else
|
|
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 > PY_SSIZE_T_MAX) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"string too long for Python bytes");
|
|
return NULL;
|
|
}
|
|
n = (Py_ssize_t)m;
|
|
}
|
|
v = PyBytes_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 = va_build_value(format, va, 0);
|
|
va_end(va);
|
|
return retval;
|
|
}
|
|
|
|
PyObject *
|
|
_Py_BuildValue_SizeT(const char *format, ...)
|
|
{
|
|
va_list va;
|
|
PyObject* retval;
|
|
va_start(va, format);
|
|
retval = va_build_value(format, va, FLAG_SIZE_T);
|
|
va_end(va);
|
|
return retval;
|
|
}
|
|
|
|
PyObject *
|
|
Py_VaBuildValue(const char *format, va_list va)
|
|
{
|
|
return va_build_value(format, va, 0);
|
|
}
|
|
|
|
PyObject *
|
|
_Py_VaBuildValue_SizeT(const char *format, va_list va)
|
|
{
|
|
return va_build_value(format, va, FLAG_SIZE_T);
|
|
}
|
|
|
|
static PyObject *
|
|
va_build_value(const char *format, va_list va, int flags)
|
|
{
|
|
const char *f = format;
|
|
int n = countformat(f, '\0');
|
|
va_list lva;
|
|
|
|
Py_VA_COPY(lva, va);
|
|
|
|
if (n < 0)
|
|
return NULL;
|
|
if (n == 0) {
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
if (n == 1)
|
|
return do_mkvalue(&f, &lva, flags);
|
|
return do_mktuple(&f, &lva, '\0', n, flags);
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
PyObject *o = PyLong_FromLong(value);
|
|
if (!o)
|
|
return -1;
|
|
if (PyModule_AddObject(m, name, o) == 0)
|
|
return 0;
|
|
Py_DECREF(o);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)
|
|
{
|
|
PyObject *o = PyUnicode_FromString(value);
|
|
if (!o)
|
|
return -1;
|
|
if (PyModule_AddObject(m, name, o) == 0)
|
|
return 0;
|
|
Py_DECREF(o);
|
|
return -1;
|
|
}
|