Originální popis anglicky:
wcsxfrm - wide-character string transformation
Návod, kniha: POSIX Programmer's Manual
#include <wchar.h>
size_t wcsxfrm(wchar_t *restrict
ws1, const wchar_t
*restrict ws2,
size_t
n);
The
wcsxfrm() function shall transform the wide-character string pointed
to by
ws2 and place the resulting wide-character string into the array
pointed to by
ws1. The transformation shall be such that if
wcscmp() is applied to two transformed wide strings, it shall return a
value greater than, equal to, or less than 0, corresponding to the result of
wcscoll() applied to the same two original wide-character strings. No
more than
n wide-character codes shall be placed into the resulting
array pointed to by
ws1, including the terminating null wide-character
code. If
n is 0,
ws1 is permitted to be a null pointer. If
copying takes place between objects that overlap, the behavior is undefined.
The
wcsxfrm() function shall not change the setting of
errno if
successful.
Since no return value is reserved to indicate an error, an application wishing
to check for error situations should set
errno to 0, then call
wcsxfrm(), then check
errno.
The
wcsxfrm() function shall return the length of the transformed
wide-character string (not including the terminating null wide-character
code). If the value returned is
n or more, the contents of the array
pointed to by
ws1 are unspecified.
On error, the
wcsxfrm() function may set
errno, but no return
value is reserved to indicate an error.
The
wcsxfrm() function may fail if:
- EINVAL
- The wide-character string pointed to by ws2 contains
wide-character codes outside the domain of the collating sequence.
The following sections are informative.
None.
The transformation function is such that two transformed wide-character strings
can be ordered by
wcscmp() as appropriate to collating sequence
information in the program's locale (category
LC_COLLATE ).
The fact that when
n is 0
ws1 is permitted to be a null pointer is
useful to determine the size of the
ws1 array prior to making the
transformation.
None.
None.
wcscmp() ,
wcscoll() , 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
.
