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2019-03-06
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Linux kernel and C library user-space interface documentation
NAME
wcstok - split wide-character string into tokens
SYNOPSIS
#include <wchar.h>
wchar_t *wcstok(wchar_t *wcs, const wchar_t *delim ", wchar_t **" ptr );
DESCRIPTION
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\(aq\0\(aq), and it updates *ptr so that subsequent calls will continue searching after the end of recognized token.
RETURN VALUE
The wcstok() function returns a pointer to the next token, or NULL if no further token was found.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| Thread safety | MT-Safe |
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
The original wcs wide-character string is destructively modified during the operation.
EXAMPLE
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)) {
... }
token != NULL;
token = wcstok(NULL, " \t\n", &state)) {
... }
