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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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WCSTOK(3P) POSIX Programmer's Manual WCSTOK(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.
wcstok — split a wide-character string into tokens
#include <wchar.h>
wchar_t *wcstok(wchar_t *restrict ws1, const wchar_t *restrict ws2,
wchar_t **restrict ptr);
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.
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 information 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 separator 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 contained 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 terminates 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().
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.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
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 WCSTOK(3P)
Pages that refer to this page: wchar.h(0p)
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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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