cpython/Python/modsupport.c at v3.6.15 · python/cpython · GitHub

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/* 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 void

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

{

PyObject *v;

int i;

assert(PyErr_Occurred());

v = PyTuple_New(n);

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

PyObject *exception, *value, *tb, *w;

PyErr_Fetch(&exception, &value, &tb);

w = do_mkvalue(p_format, p_va, flags);

PyErr_Restore(exception, value, tb);

if (w != NULL) {

if (v != NULL) {

PyTuple_SET_ITEM(v, i, w);

}

else {

Py_DECREF(w);

}

Py_XDECREF(v);

if (**p_format != endchar) {

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

return;

}

if (endchar)

++*p_format;

}

static PyObject *

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

{

PyObject *d;

int i;

if (n < 0)

return NULL;

if (n % 2) {

PyErr_SetString(PyExc_SystemError,

"Bad dict format");

do_ignore(p_format, p_va, endchar, n, flags);

return NULL;

}

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

refcounts on any 'N' arguments. */

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

do_ignore(p_format, p_va, endchar, n, flags);

return NULL;

}

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

PyObject *k, *v;

k = do_mkvalue(p_format, p_va, flags);

if (k == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1, flags);

Py_DECREF(d);

return NULL;

}

v = do_mkvalue(p_format, p_va, flags);

if (v == NULL || PyDict_SetItem(d, k, v) < 0) {

do_ignore(p_format, p_va, endchar, n - i - 2, flags);

Py_DECREF(k);

Py_XDECREF(v);

Py_DECREF(d);

return NULL;

}

Py_DECREF(k);

Py_DECREF(v);

}

if (**p_format != endchar) {

Py_DECREF(d);

PyErr_SetString(PyExc_SystemError,

"Unmatched paren in format");

return NULL;

}

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;

if (n < 0)

return NULL;

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

refcounts on any 'N' arguments. */

v = PyList_New(n);

if (v == NULL) {

do_ignore(p_format, p_va, endchar, n, flags);

return NULL;

}

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

PyObject *w = do_mkvalue(p_format, p_va, flags);

if (w == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1, flags);

Py_DECREF(v);

return NULL;

}

PyList_SET_ITEM(v, i, w);

}

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

{

PyObject *v;

int i;

if (n < 0)

return NULL;

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

refcounts on any 'N' arguments. */

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

do_ignore(p_format, p_va, endchar, n, flags);

return NULL;

}

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

PyObject *w = do_mkvalue(p_format, p_va, flags);

if (w == NULL) {

do_ignore(p_format, p_va, endchar, n - i - 1, flags);

Py_DECREF(v);

return NULL;

}

PyTuple_SET_ITEM(v, i, w);

}

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);

}

case 'L':

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

case 'K':

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

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 = Py_UNICODE_strlen(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);

return PyUnicode_FromOrdinal(i);

}

case 's':

case 'z':

case 'U': /* XXX deprecated alias */

{

PyObject *v;

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

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

PyObject *retval;

if (n < 0)

return NULL;

if (n == 0) {

Py_INCREF(Py_None);

return Py_None;

}

va_copy(lva, va);

if (n == 1) {

retval = do_mkvalue(&f, &lva, flags);

} else {

retval = do_mktuple(&f, &lva, '\0', n, flags);

}

va_end(lva);

return retval;

}

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;

}

cpython/Python/modsupport.c at v3.6.15 · python/cpython · GitHub

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