Table of 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 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, i.e. 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 L'\0' character, 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.

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)) {
  ...
}

Conforming to

ISO/ANSI C, UNIX98

See Also

strtok(3) , wcschr(3)

Table of Contents