NAME

wmemchr — find a wide character in memory

SYNOPSIS

#include <wchar.h>

wchar_t *wmemchr(const wchar_t *ws, wchar_t wc, size_t n);


DESCRIPTION

^[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

The wmemchr() function shall locate the first occurrence of wc in the initial n wide characters of the object pointed to by ws. This function shall not be affected by locale and all wchar_t values shall be treated identically. The null wide character and wchar_t values not corresponding to valid characters shall not be treated specially.

If n is zero, the application shall ensure that ws is a valid pointer and the function behaves as if no valid occurrence of wc is found.

^[CX] The wmemchr() function shall not change the setting of errno on valid input.

RETURN VALUE

The wmemchr() function shall return a pointer to the located wide character, or a null pointer if the wide character does not occur in the object.

ERRORS

No errors are defined.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

wmemcmp, wmemcpy, wmemmove, wmemset

XBD <wchar.h>

CHANGE HISTORY

First released in Issue 5. Included for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E).

Issue 6

The normative text is updated to avoid use of the term "must" for application requirements.

Issue 8

Austin Group Defect 448 is applied, adding a requirement that wmemchr() does not change the setting of errno on valid input.