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-
- /* String object interface */
-
- #ifndef Py_STRINGOBJECT_H
- #define Py_STRINGOBJECT_H
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /*
- 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(const char *, int);
- extern DL_IMPORT(PyObject *) PyString_FromString(const char *);
- extern DL_IMPORT(int) PyString_Size(PyObject *);
- extern DL_IMPORT(char *) PyString_AsString(PyObject *);
- extern DL_IMPORT(void) PyString_Concat(PyObject **, PyObject *);
- extern DL_IMPORT(void) PyString_ConcatAndDel(PyObject **, PyObject *);
- extern DL_IMPORT(int) _PyString_Resize(PyObject **, int);
- extern DL_IMPORT(PyObject *) PyString_Format(PyObject *, PyObject *);
- extern DL_IMPORT(PyObject *) _PyString_FormatLong(PyObject*, int, int,
- int, char**, int*);
-
- #ifdef INTERN_STRINGS
- extern DL_IMPORT(void) PyString_InternInPlace(PyObject **);
- extern DL_IMPORT(PyObject *) PyString_InternFromString(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)
-
- /* --- Generic Codecs ----------------------------------------------------- */
-
- /* Create a string object by decoding the encoded string s of the
- given size. */
-
- extern DL_IMPORT(PyObject*) PyString_Decode(
- const char *s, /* encoded string */
- int size, /* size of buffer */
- const char *encoding, /* encoding */
- const char *errors /* error handling */
- );
-
- /* Encodes a char buffer of the given size and returns a
- Python string object. */
-
- extern DL_IMPORT(PyObject*) PyString_Encode(
- const char *s, /* string char buffer */
- int size, /* number of chars to encode */
- const char *encoding, /* encoding */
- const char *errors /* error handling */
- );
-
- /* Encodes a string object and returns the result as Python string
- object. */
-
- extern DL_IMPORT(PyObject*) PyString_AsEncodedString(
- PyObject *str, /* string object */
- const char *encoding, /* encoding */
- const char *errors /* error handling */
- );
-
- /* Provides access to the internal data buffer and size of a string
- object or the default encoded version of an Unicode object. Passing
- NULL as *len parameter will force the string buffer to be
- 0-terminated (passing a string with embedded NULL characters will
- cause an exception). */
-
- extern DL_IMPORT(int) PyString_AsStringAndSize(
- register PyObject *obj, /* string or Unicode object */
- register char **s, /* pointer to buffer variable */
- register int *len /* pointer to length variable or NULL
- (only possible for 0-terminated
- strings) */
- );
-
-
- #ifdef __cplusplus
- }
- #endif
- #endif /* !Py_STRINGOBJECT_H */
-