mirror of
https://github.com/python/cpython.git
synced 2024-11-24 10:24:35 +08:00
576 lines
14 KiB
C
576 lines
14 KiB
C
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/* Module support implementation */
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#include "Python.h"
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#define FLAG_SIZE_T 1
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typedef double va_double;
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static PyObject *va_build_value(const char *, va_list, int);
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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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/* Helper for mkvalue() to scan the length of a format */
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static int
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countformat(const 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(const char**, va_list *, int, int, int);
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static PyObject *do_mklist(const char**, va_list *, int, int, int);
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static PyObject *do_mkdict(const char**, va_list *, int, int, int);
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static PyObject *do_mkvalue(const char**, va_list *, int);
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static PyObject *
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do_mkdict(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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{
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PyObject *d;
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int i;
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int itemfailed = 0;
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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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/* Note that we can't bail immediately on error as this will leak
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refcounts on any 'N' arguments. */
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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, flags);
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if (k == NULL) {
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itemfailed = 1;
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Py_INCREF(Py_None);
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k = Py_None;
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}
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v = do_mkvalue(p_format, p_va, flags);
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if (v == NULL) {
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itemfailed = 1;
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Py_INCREF(Py_None);
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v = Py_None;
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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 || itemfailed) {
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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(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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{
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PyObject *v;
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int i;
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int itemfailed = 0;
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if (n < 0)
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return NULL;
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v = PyList_New(n);
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if (v == NULL)
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return NULL;
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/* Note that we can't bail immediately on error as this will leak
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refcounts on any 'N' arguments. */
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va, flags);
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if (w == NULL) {
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itemfailed = 1;
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Py_INCREF(Py_None);
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w = Py_None;
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}
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PyList_SET_ITEM(v, i, w);
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}
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if (itemfailed) {
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/* do_mkvalue() should have already set an error */
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Py_DECREF(v);
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return NULL;
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}
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if (**p_format != endchar) {
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Py_DECREF(v);
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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return NULL;
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}
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if (endchar)
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++*p_format;
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return v;
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}
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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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static PyObject *
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do_mktuple(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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{
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PyObject *v;
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int i;
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int itemfailed = 0;
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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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/* Note that we can't bail immediately on error as this will leak
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refcounts on any 'N' arguments. */
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va, flags);
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if (w == NULL) {
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itemfailed = 1;
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Py_INCREF(Py_None);
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w = Py_None;
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}
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PyTuple_SET_ITEM(v, i, w);
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}
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if (itemfailed) {
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/* do_mkvalue() should have already set an error */
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Py_DECREF(v);
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return NULL;
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}
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if (**p_format != endchar) {
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Py_DECREF(v);
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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return NULL;
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}
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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(const char **p_format, va_list *p_va, int flags)
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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, ')'), flags);
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case '[':
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return do_mklist(p_format, p_va, ']',
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countformat(*p_format, ']'), flags);
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case '{':
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return do_mkdict(p_format, p_va, '}',
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countformat(*p_format, '}'), flags);
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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 PyLong_FromLong((long)va_arg(*p_va, int));
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case 'H':
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return PyLong_FromLong((long)va_arg(*p_va, unsigned int));
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case 'I':
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{
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unsigned int n;
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n = va_arg(*p_va, unsigned int);
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return PyLong_FromUnsignedLong(n);
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}
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case 'n':
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#if SIZEOF_SIZE_T!=SIZEOF_LONG
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return PyLong_FromSsize_t(va_arg(*p_va, Py_ssize_t));
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#endif
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/* Fall through from 'n' to 'l' if Py_ssize_t is long */
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case 'l':
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return PyLong_FromLong(va_arg(*p_va, long));
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case 'k':
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{
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unsigned long n;
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n = va_arg(*p_va, unsigned long);
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return PyLong_FromUnsignedLong(n);
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}
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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_FromUnsignedLongLong((PY_LONG_LONG)va_arg(*p_va, unsigned PY_LONG_LONG));
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#endif
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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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Py_ssize_t n;
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if (**p_format == '#') {
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++*p_format;
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if (flags & FLAG_SIZE_T)
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n = va_arg(*p_va, Py_ssize_t);
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else
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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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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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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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case 'c':
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{
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char p[1];
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p[0] = (char)va_arg(*p_va, int);
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return PyBytes_FromStringAndSize(p, 1);
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}
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case 'C':
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{
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int i = va_arg(*p_va, int);
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if (i < 0 || i > PyUnicode_GetMax()) {
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PyErr_SetString(PyExc_OverflowError,
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"%c arg not in range(0x110000)");
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return NULL;
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}
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return PyUnicode_FromOrdinal(i);
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}
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case 's':
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case 'z':
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case 'U': /* XXX deprecated alias */
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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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Py_ssize_t n;
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if (**p_format == '#') {
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++*p_format;
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if (flags & FLAG_SIZE_T)
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n = va_arg(*p_va, Py_ssize_t);
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else
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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 > PY_SSIZE_T_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 = (Py_ssize_t)m;
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}
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v = PyUnicode_FromStringAndSize(str, n);
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}
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return v;
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}
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case 'y':
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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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Py_ssize_t n;
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if (**p_format == '#') {
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++*p_format;
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if (flags & FLAG_SIZE_T)
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n = va_arg(*p_va, Py_ssize_t);
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else
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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 > PY_SSIZE_T_MAX) {
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PyErr_SetString(PyExc_OverflowError,
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"string too long for Python bytes");
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return NULL;
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}
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n = (Py_ssize_t)m;
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}
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v = PyBytes_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(const 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 = va_build_value(format, va, 0);
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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_BuildValue_SizeT(const 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 = va_build_value(format, va, FLAG_SIZE_T);
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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(const char *format, va_list va)
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{
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return va_build_value(format, va, 0);
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}
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PyObject *
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_Py_VaBuildValue_SizeT(const char *format, va_list va)
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{
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return va_build_value(format, va, FLAG_SIZE_T);
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}
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static PyObject *
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va_build_value(const char *format, va_list va, int flags)
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{
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const char *f = format;
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int n = countformat(f, '\0');
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va_list lva;
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Py_VA_COPY(lva, va);
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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, flags);
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return do_mktuple(&f, &lva, '\0', n, flags);
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}
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PyObject *
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PyEval_CallFunction(PyObject *obj, const 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, const char *methodname, const 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, const char *name, PyObject *o)
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{
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PyObject *dict;
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if (!PyModule_Check(m)) {
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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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if (!o) {
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if (!PyErr_Occurred())
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PyErr_SetString(PyExc_TypeError,
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"PyModule_AddObject() needs non-NULL value");
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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, const char *name, long value)
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{
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PyObject *o = PyLong_FromLong(value);
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if (!o)
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return -1;
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if (PyModule_AddObject(m, name, o) == 0)
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return 0;
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Py_DECREF(o);
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return -1;
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}
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int
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PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)
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{
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PyObject *o = PyUnicode_FromString(value);
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if (!o)
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return -1;
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if (PyModule_AddObject(m, name, o) == 0)
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return 0;
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Py_DECREF(o);
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return -1;
|
|
}
|