NAME
wcstok —
split wide-character string into
tokens
SYNOPSIS
#include
<wchar.h>
wchar_t *
wcstok(wchar_t
* restrict str, const
wchar_t * restrict sep,
wchar_t ** restrict
last);
DESCRIPTION
The
wcstok()
function is used to isolate sequential tokens in a NUL-terminated
wide-character string, str. These tokens are separated
in the string by at least one of the characters in
sep. The first time that
wcstok() is called, str should
be specified; subsequent calls, wishing to obtain further tokens from the
same string, should pass a null pointer instead. The separator string,
sep, must be supplied each time, and may change
between calls. The context pointer last must be
provided on each call.
The
wcstok()
function is the wide-character counterpart of the
strtok_r(3) function.
Since
wcstok()
modifies the string, str should not point to an area
in the initialized data segment.
RETURN VALUES
The wcstok() function returns a pointer to
the beginning of each subsequent token in the string, after replacing the
token itself with a NUL wide character (L'\0'). When no more tokens remain,
a null pointer is returned.
EXAMPLES
The following code fragment splits a wide-character string on ASCII space, tab, and newline characters and writes the tokens to standard output:
const wchar_t *seps = L" \t\n";
wchar_t *last, *tok, text[] = L" \none\ttwo\t\tthree \n";
for (tok = wcstok(text, seps, &last); tok != NULL;
tok = wcstok(NULL, seps, &last))
wprintf(L"%ls\n", tok);
SEE ALSO
strtok(3), wcschr(3), wcscspn(3), wcspbrk(3), wcsrchr(3), wcsspn(3), wcsstr(3), wmemchr(3)
STANDARDS
The wcstok() function conforms to
ISO/IEC 9899:1999
(“ISO C99”).
HISTORY
The wcstok() function was ported from
NetBSD and first appeared in
OpenBSD 3.8.
Some early implementations of wcstok()
omit the context pointer argument, last, and maintain
state across calls in a static variable like
strtok(3)
does.