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WCSTOK

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index Return to Main Contents
 

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 (Laq\0aq), 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).
InterfaceAttributeValue
wcstok() Thread safetyMT-Safe
 

CONFORMING TO

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)) {
    ...
}
 

SEE ALSO

strtok(3), wcschr(3)  

COLOPHON

This page is part of release 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
NOTES
EXAMPLE
SEE ALSO
COLOPHON


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