The Open Group Base Specifications Issue 8
IEEE Std 1003.1-2024
Copyright © 2001-2024 The IEEE and The Open Group

NAME

wcsstr — find a wide-character substring

SYNOPSIS

#include <wchar.h>

wchar_t *wcsstr(const wchar_t *restrict
ws1,
       const wchar_t *restrict
ws2);

DESCRIPTION

[CX] [Option Start] 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. [Option End]

The wcsstr() function shall locate the first occurrence in the wide-character string pointed to by ws1 of the sequence of wide characters (excluding the terminating null wide character) in the wide-character string pointed to by ws2.

[CX] [Option Start] The wcsstr() function shall not change the setting of errno on valid input. [Option End]

RETURN VALUE

Upon successful completion, wcsstr() shall return a pointer to the located wide-character string, or a null pointer if the wide-character string is not found.

If ws2 points to a wide-character string with zero length, the function shall return ws1.

ERRORS

No errors are defined.


The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

wcschr

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 wcsstr() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.

Issue 8

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

End of informative text.

 

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