WCSTOK(3P) POSIX Programmer's Manual WCSTOK(3P)PROLOG
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.
NAMEwcstok — split a wide-character string into tokens
SYNOPSIS
#include <wchar.h>
wchar_t *wcstok(wchar_t *restrict ws1, const wchar_t *restrict ws2,
wchar_t **restrict ptr);
DESCRIPTION
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.1‐2008
defers to the ISO C standard.
A sequence of calls to wcstok() shall break the wide-character string
pointed to by ws1 into a sequence of tokens, each of which shall be
delimited by a wide-character code from the wide-character string
pointed to by ws2. The ptr argument points to a caller-provided
wchar_t pointer into which the wcstok() function shall store informa‐
tion necessary for it to continue scanning the same wide-character
string.
The first call in the sequence has ws1 as its first argument, and is
followed by calls with a null pointer as their first argument. The sep‐
arator string pointed to by ws2 may be different from call to call.
The first call in the sequence shall search the wide-character string
pointed to by ws1 for the first wide-character code that is not con‐
tained in the current separator string pointed to by ws2. If no such
wide-character code is found, then there are no tokens in the wide-
character string pointed to by ws1 and wcstok() shall return a null
pointer. If such a wide-character code is found, it shall be the start
of the first token.
The wcstok() function shall then search from there for a wide-character
code that is contained in the current separator string. If no such
wide-character code is found, the current token extends to the end of
the wide-character string pointed to by ws1, and subsequent searches
for a token shall return a null pointer. If such a wide-character code
is found, it shall be overwritten by a null wide character, which ter‐
minates the current token. The wcstok() function shall save a pointer
to the following wide-character code, from which the next search for a
token shall start.
Each subsequent call, with a null pointer as the value of the first
argument, shall start searching from the saved pointer and behave as
described above.
The implementation shall behave as if no function calls wcstok().
RETURN VALUE
Upon successful completion, the wcstok() function shall return a
pointer to the first wide-character code of a token. Otherwise, if
there is no token, wcstok() shall return a null pointer.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
The Base Definitions volume of POSIX.1‐2008, <wchar.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 WCSTOK(3P)
