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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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WCSXFRM(3P) POSIX Programmer's Manual WCSXFRM(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
wcsxfrm, wcsxfrm_l — wide-character string transformation
#include <wchar.h>
size_t wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2,
size_t n);
size_t wcsxfrm_l(wchar_t *restrict ws1, const wchar_t *restrict ws2,
size_t n, locale_t locale);
For wcsxfrm(): The functionality described on this reference page
is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is
unintentional. This volume of POSIX.1‐2017 defers to the ISO C
standard.
The wcsxfrm() and wcsxfrm_l() functions 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() and wcscoll_l() applied to the same two original wide-
character strings, and the same LC_COLLATE category of the
current locale or the locale object locale, respectively. 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() and wcsxfrm_l() functions 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() or wcsxfrm_l(), then check errno.
The behavior is undefined if the locale argument to wcsxfrm_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
The wcsxfrm() and wcsxfrm_l() functions 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() and wcsxfrm_l() functions may set errno,
but no return value is reserved to indicate an error.
These functions 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 current 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(3p), wcscoll(3p)
The Base Definitions volume of POSIX.1‐2017, wchar.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 WCSXFRM(3P)
Pages that refer to this page: wchar.h(0p), setlocale(3p), wcscoll(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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