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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | EXAMPLES | SEE ALSO | COLOPHON |
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wcstok(3) Library Functions Manual wcstok(3)
wcstok - split wide-character string into tokens
Standard C library (libc, -lc)
#include <wchar.h>
wchar_t *wcstok(wchar_t *restrict wcs, const wchar_t *restrict delim,
wchar_t **restrict ptr);
The wcstok() function is the wide-character equivalent of the
strtok(3) function, with an added argument to make it
multithread-safe. It can be used to split a wide-character
string wcs into tokens, where a token is defined as a substring
not containing any wide-characters from delim.
The search starts at wcs, if wcs is not NULL, or at *ptr, if wcs
is NULL. First, any delimiter wide-characters are skipped, that
is, the pointer is advanced beyond any wide-characters which
occur in delim. If the end of the wide-character string is now
reached, wcstok() returns NULL, to indicate that no tokens were
found, and stores an appropriate value in *ptr, so that
subsequent calls to wcstok() will continue to return NULL.
Otherwise, the wcstok() function recognizes the beginning of a
token and returns a pointer to it, but before doing that, it
zero-terminates the token by replacing the next wide-character
which occurs in delim with a null wide character (L'\0'), and it
updates *ptr so that subsequent calls will continue searching
after the end of recognized token.
The wcstok() function returns a pointer to the next token, or
NULL if no further token was found.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ wcstok() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The original wcs wide-character string is destructively modified
during the operation.
The following code loops over the tokens contained in a wide-
character string.
wchar_t *wcs = ...;
wchar_t *token;
wchar_t *state;
for (token = wcstok(wcs, L" \t\n", &state);
token != NULL;
token = wcstok(NULL, L" \t\n", &state)) {
...
}
strtok(3), wcschr(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-06-15 wcstok(3)
Pages that refer to this page: strtok(3), signal-safety(7)
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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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