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- #ifndef Py_STRINGOBJECT_H
- #define Py_STRINGOBJECT_H
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /***********************************************************
- Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
- The Netherlands.
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- provided that the above copyright notice appear in all copies and that
- both that copyright notice and this permission notice appear in
- supporting documentation, and that the names of Stichting Mathematisch
- Centrum or CWI or Corporation for National Research Initiatives or
- CNRI not be used in advertising or publicity pertaining to
- distribution of the software without specific, written prior
- permission.
-
- While CWI is the initial source for this software, a modified version
- is made available by the Corporation for National Research Initiatives
- (CNRI) at the Internet address ftp://ftp.python.org.
-
- STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
- REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
- CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
- DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- PERFORMANCE OF THIS SOFTWARE.
-
- ******************************************************************/
-
- /* String object interface */
-
- /*
- Type PyStringObject represents a character string. An extra zero byte is
- reserved at the end to ensure it is zero-terminated, but a size is
- present so strings with null bytes in them can be represented. This
- is an immutable object type.
-
- There are functions to create new string objects, to test
- an object for string-ness, and to get the
- string value. The latter function returns a null pointer
- if the object is not of the proper type.
- There is a variant that takes an explicit size as well as a
- variant that assumes a zero-terminated string. Note that none of the
- functions should be applied to nil objects.
- */
-
- /* Two speedup hacks. Caching the hash saves recalculation of a
- string's hash value. Interning strings (which requires hash
- caching) tries to ensure that only one string object with a given
- value exists, so equality tests are one pointer comparison.
- Together, these can speed the interpreter up by as much as 20%.
- Each costs the size of a long or pointer per string object. In
- addition, interned strings live until the end of times. If you are
- concerned about memory footprint, simply comment the #define out
- here (and rebuild everything!). */
- #define CACHE_HASH
- #ifdef CACHE_HASH
- #define INTERN_STRINGS
- #endif
-
- typedef struct {
- PyObject_VAR_HEAD
- #ifdef CACHE_HASH
- long ob_shash;
- #endif
- #ifdef INTERN_STRINGS
- PyObject *ob_sinterned;
- #endif
- char ob_sval[1];
- } PyStringObject;
-
- extern DL_IMPORT(PyTypeObject) PyString_Type;
-
- #define PyString_Check(op) ((op)->ob_type == &PyString_Type)
-
- extern DL_IMPORT(PyObject *) PyString_FromStringAndSize Py_PROTO((const char *, int));
- extern DL_IMPORT(PyObject *) PyString_FromString Py_PROTO((const char *));
- extern DL_IMPORT(int) PyString_Size Py_PROTO((PyObject *));
- extern DL_IMPORT(char *) PyString_AsString Py_PROTO((PyObject *));
- extern DL_IMPORT(void) PyString_Concat Py_PROTO((PyObject **, PyObject *));
- extern DL_IMPORT(void) PyString_ConcatAndDel Py_PROTO((PyObject **, PyObject *));
- extern DL_IMPORT(int) _PyString_Resize Py_PROTO((PyObject **, int));
- extern DL_IMPORT(PyObject *) PyString_Format Py_PROTO((PyObject *, PyObject *));
-
- #ifdef INTERN_STRINGS
- extern DL_IMPORT(void) PyString_InternInPlace Py_PROTO((PyObject **));
- extern DL_IMPORT(PyObject *) PyString_InternFromString Py_PROTO((const char *));
- #else
- #define PyString_InternInPlace(p)
- #define PyString_InternFromString(cp) PyString_FromString(cp)
- #endif
-
- /* Macro, trading safety for speed */
- #define PyString_AS_STRING(op) (((PyStringObject *)(op))->ob_sval)
- #define PyString_GET_SIZE(op) (((PyStringObject *)(op))->ob_size)
-
- #ifdef __cplusplus
- }
- #endif
- #endif /* !Py_STRINGOBJECT_H */
-