mirror of https://github.com/python/cpython
218 lines
7.8 KiB
C
218 lines
7.8 KiB
C
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/* Bytes (String) object interface */
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#ifndef Py_BYTESOBJECT_H
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#define Py_BYTESOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdarg.h>
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/*
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Type PyBytesObject represents a character string. An extra zero byte is
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reserved at the end to ensure it is zero-terminated, but a size is
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present so strings with null bytes in them can be represented. This
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is an immutable object type.
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There are functions to create new string objects, to test
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an object for string-ness, and to get the
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string value. The latter function returns a null pointer
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if the object is not of the proper type.
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There is a variant that takes an explicit size as well as a
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variant that assumes a zero-terminated string. Note that none of the
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functions should be applied to nil objects.
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*/
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/* Caching the hash (ob_shash) saves recalculation of a string's hash value.
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This significantly speeds up dict lookups. */
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#ifndef Py_LIMITED_API
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typedef struct {
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PyObject_VAR_HEAD
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Py_hash_t ob_shash;
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char ob_sval[1];
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/* Invariants:
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* ob_sval contains space for 'ob_size+1' elements.
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* ob_sval[ob_size] == 0.
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* ob_shash is the hash of the string or -1 if not computed yet.
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*/
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} PyBytesObject;
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#endif
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PyAPI_DATA(PyTypeObject) PyBytes_Type;
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PyAPI_DATA(PyTypeObject) PyBytesIter_Type;
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#define PyBytes_Check(op) \
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PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_BYTES_SUBCLASS)
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#define PyBytes_CheckExact(op) (Py_TYPE(op) == &PyBytes_Type)
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PyAPI_FUNC(PyObject *) PyBytes_FromStringAndSize(const char *, Py_ssize_t);
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PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);
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PyAPI_FUNC(PyObject *) PyBytes_FromObject(PyObject *);
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PyAPI_FUNC(PyObject *) PyBytes_FromFormatV(const char*, va_list)
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Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
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PyAPI_FUNC(PyObject *) PyBytes_FromFormat(const char*, ...)
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Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
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PyAPI_FUNC(Py_ssize_t) PyBytes_Size(PyObject *);
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PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
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PyAPI_FUNC(PyObject *) PyBytes_Repr(PyObject *, int);
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PyAPI_FUNC(void) PyBytes_Concat(PyObject **, PyObject *);
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PyAPI_FUNC(void) PyBytes_ConcatAndDel(PyObject **, PyObject *);
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#ifndef Py_LIMITED_API
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PyAPI_FUNC(int) _PyBytes_Resize(PyObject **, Py_ssize_t);
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PyAPI_FUNC(PyObject*) _PyBytes_FormatEx(
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const char *format,
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Py_ssize_t format_len,
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PyObject *args,
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int use_bytearray);
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PyAPI_FUNC(PyObject*) _PyBytes_FromHex(
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PyObject *string,
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int use_bytearray);
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#endif
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PyAPI_FUNC(PyObject *) PyBytes_DecodeEscape(const char *, Py_ssize_t,
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const char *, Py_ssize_t,
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const char *);
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/* Macro, trading safety for speed */
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#ifndef Py_LIMITED_API
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#define PyBytes_AS_STRING(op) (assert(PyBytes_Check(op)), \
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(((PyBytesObject *)(op))->ob_sval))
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#define PyBytes_GET_SIZE(op) (assert(PyBytes_Check(op)),Py_SIZE(op))
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#endif
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/* _PyBytes_Join(sep, x) is like sep.join(x). sep must be PyBytesObject*,
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x must be an iterable object. */
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#ifndef Py_LIMITED_API
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PyAPI_FUNC(PyObject *) _PyBytes_Join(PyObject *sep, PyObject *x);
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#endif
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/* Provides access to the internal data buffer and size of a string
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object or the default encoded version of an Unicode object. Passing
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NULL as *len parameter will force the string buffer to be
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0-terminated (passing a string with embedded NULL characters will
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cause an exception). */
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PyAPI_FUNC(int) PyBytes_AsStringAndSize(
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PyObject *obj, /* string or Unicode object */
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char **s, /* pointer to buffer variable */
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Py_ssize_t *len /* pointer to length variable or NULL
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(only possible for 0-terminated
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strings) */
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);
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/* Using the current locale, insert the thousands grouping
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into the string pointed to by buffer. For the argument descriptions,
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see Objects/stringlib/localeutil.h */
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#ifndef Py_LIMITED_API
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PyAPI_FUNC(Py_ssize_t) _PyBytes_InsertThousandsGroupingLocale(char *buffer,
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Py_ssize_t n_buffer,
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char *digits,
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Py_ssize_t n_digits,
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Py_ssize_t min_width);
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/* Using explicit passed-in values, insert the thousands grouping
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into the string pointed to by buffer. For the argument descriptions,
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see Objects/stringlib/localeutil.h */
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PyAPI_FUNC(Py_ssize_t) _PyBytes_InsertThousandsGrouping(char *buffer,
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Py_ssize_t n_buffer,
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char *digits,
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Py_ssize_t n_digits,
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Py_ssize_t min_width,
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const char *grouping,
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const char *thousands_sep);
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#endif
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/* Flags used by string formatting */
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#define F_LJUST (1<<0)
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#define F_SIGN (1<<1)
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#define F_BLANK (1<<2)
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#define F_ALT (1<<3)
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#define F_ZERO (1<<4)
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#ifndef Py_LIMITED_API
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/* The _PyBytesWriter structure is big: it contains an embeded "stack buffer".
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A _PyBytesWriter variable must be declared at the end of variables in a
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function to optimize the memory allocation on the stack. */
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typedef struct {
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/* bytes, bytearray or NULL (when the small buffer is used) */
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PyObject *buffer;
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/* Number of allocated size. */
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Py_ssize_t allocated;
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/* Minimum number of allocated bytes,
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incremented by _PyBytesWriter_Prepare() */
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Py_ssize_t min_size;
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/* If non-zero, use a bytearray instead of a bytes object for buffer. */
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int use_bytearray;
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/* If non-zero, overallocate the buffer (default: 0).
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This flag must be zero if use_bytearray is non-zero. */
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int overallocate;
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/* Stack buffer */
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int use_small_buffer;
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char small_buffer[512];
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} _PyBytesWriter;
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/* Initialize a bytes writer
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By default, the overallocation is disabled. Set the overallocate attribute
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to control the allocation of the buffer. */
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PyAPI_FUNC(void) _PyBytesWriter_Init(_PyBytesWriter *writer);
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/* Get the buffer content and reset the writer.
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Return a bytes object, or a bytearray object if use_bytearray is non-zero.
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Raise an exception and return NULL on error. */
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PyAPI_FUNC(PyObject *) _PyBytesWriter_Finish(_PyBytesWriter *writer,
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void *str);
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/* Deallocate memory of a writer (clear its internal buffer). */
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PyAPI_FUNC(void) _PyBytesWriter_Dealloc(_PyBytesWriter *writer);
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/* Allocate the buffer to write size bytes.
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Return the pointer to the beginning of buffer data.
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Raise an exception and return NULL on error. */
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PyAPI_FUNC(void*) _PyBytesWriter_Alloc(_PyBytesWriter *writer,
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Py_ssize_t size);
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/* Ensure that the buffer is large enough to write *size* bytes.
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Add size to the writer minimum size (min_size attribute).
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str is the current pointer inside the buffer.
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Return the updated current pointer inside the buffer.
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Raise an exception and return NULL on error. */
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PyAPI_FUNC(void*) _PyBytesWriter_Prepare(_PyBytesWriter *writer,
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void *str,
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Py_ssize_t size);
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/* Resize the buffer to make it larger.
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The new buffer may be larger than size bytes because of overallocation.
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Return the updated current pointer inside the buffer.
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Raise an exception and return NULL on error.
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Note: size must be greater than the number of allocated bytes in the writer.
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This function doesn't use the writer minimum size (min_size attribute).
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See also _PyBytesWriter_Prepare().
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*/
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PyAPI_FUNC(void*) _PyBytesWriter_Resize(_PyBytesWriter *writer,
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void *str,
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Py_ssize_t size);
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/* Write bytes.
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Raise an exception and return NULL on error. */
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PyAPI_FUNC(void*) _PyBytesWriter_WriteBytes(_PyBytesWriter *writer,
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void *str,
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const void *bytes,
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Py_ssize_t size);
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#endif /* Py_LIMITED_API */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_BYTESOBJECT_H */
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