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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | EXAMPLE | SEE ALSO | COLOPHON |
WCSTOK(3) Linux Programmer's Manual WCSTOK(3)
wcstok - split wide-character string into tokens
#include <wchar.h>
wchar_t *wcstok(wchar_t *wcs, const wchar_t *delim, wchar_t **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)) {
...
}
strtok(3), wcschr(3)
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GNU 2015-08-08 WCSTOK(3)
Pages that refer to this page: strtok(3), signal-safety(7)