| #ifndef Py_STRINGOBJECT_H |
| #define Py_STRINGOBJECT_H |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /*********************************************************** |
| Copyright (c) 2000, BeOpen.com. |
| Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| All rights reserved. |
| |
| See the file "Misc/COPYRIGHT" for information on usage and |
| redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
| ******************************************************************/ |
| |
| /* 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 */ |