This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding Linux
manual page for details of Linux behavior), or the interface may not be
implemented on Linux.
wmemchr — find a wide character in memory
wchar_t *wmemchr(const wchar_t *ws, wchar_t wc, size_t n);
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.1‐2017 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
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.
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
No errors are defined.
The following sections are informative.
wmemcmp(), wmemcpy(), wmemmove(),
The Base Definitions volume of POSIX.1‐2017,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1-2017, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018
Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html .
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