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.