Originální popis anglicky:
mbsrtowcs - convert a character string to a wide-character string (restartable)
Návod, kniha: POSIX Programmer's Manual
#include <wchar.h>
size_t mbsrtowcs(wchar_t *restrict
dst, const char
**restrict src,
size_t
len , mbstate_t *restrict
ps);
The
mbsrtowcs() function shall convert a sequence of characters,
beginning in the conversion state described by the object pointed to by
ps, from the array indirectly pointed to by
src into a sequence
of corresponding wide characters. If
dst is not a null pointer, the
converted characters shall be stored into the array pointed to by
dst.
Conversion continues up to and including a terminating null character, which
shall also be stored. Conversion shall stop early in either of the following
cases:
- *
- A sequence of bytes is encountered that does not form a
valid character.
- *
- len codes have been stored into the array pointed to
by dst (and dst is not a null pointer).
Each conversion shall take place as if by a call to the
mbrtowc()
function.
If
dst is not a null pointer, the pointer object pointed to by
src
shall be assigned either a null pointer (if conversion stopped due to reaching
a terminating null character) or the address just past the last character
converted (if any). If conversion stopped due to reaching a terminating null
character, and if
dst is not a null pointer, the resulting state
described shall be the initial conversion state.
If
ps is a null pointer, the
mbsrtowcs() function shall use its
own internal
mbstate_t object, which is initialized at program start-up
to the initial conversion state. Otherwise, the
mbstate_t object
pointed to by
ps shall be used to completely describe the current
conversion state of the associated character sequence. The implementation
behaves as if no function defined in this volume of
IEEE Std 1003.1-2001 calls
mbsrtowcs().
The behavior of this function shall be affected by the
LC_CTYPE category
of the current locale.
If the input conversion encounters a sequence of bytes that do not form a valid
character, an encoding error occurs. In this case, the
mbsrtowcs()
function stores the value of the macro [EILSEQ] in
errno and shall
return (
size_t)-1; the conversion state is undefined. Otherwise, it
shall return the number of characters successfully converted, not including
the terminating null (if any).
The
mbsrtowcs() function may fail if:
- EINVAL
- ps points to an object that contains an invalid
conversion state.
- EILSEQ
- Invalid character sequence is detected.
The following sections are informative.
None.
None.
None.
None.
mbsinit() ,
mbrtowc() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<wchar.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
