wcstok - split wide-character string into tokens
#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 |
POSIX.1-2001, POSIX.1-2008, 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, " \t\n", &state);
token != NULL;
token = wcstok(NULL, " \t\n", &state)) {
...
}
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