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WCSXFRM(3)                              BSD Library Functions Manual                              WCSXFRM(3)

NAME
     wcsxfrm, wcsxfrm_l -- transform a wide string under locale

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <wchar.h>

     size_t
     wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2, size_t n);

     #include <wchar.h>
     #include <xlocale.h>

     size_t
     wcsxfrm_l(wchar_t *restrict ws1, const wchar_t *restrict ws2, size_t n, locale_t loc);

DESCRIPTION
     The wcsxfrm() function transforms a null-terminated wide character string pointed to by ws2, according
     to the current locale's collation order, then copies the transformed string into ws1.  No more than n
     wide characters are copied into ws1, including the terminating null character.  If n is set to 0 (it
     helps to determine an actual size needed for transformation), ws1 is permitted to be a NULL pointer.

     Comparing two strings using wcscmp() after wcsxfrm() is equivalent to comparing two original strings
     with wcscoll().

     Although the wcsxfrm() function uses the current locale, the wcsxfrm_l() function may be passed a
     locale directly. See xlocale(3) for more information.

RETURN VALUES
     Upon successful completion, wcsxfrm() returns the length of the transformed string not including the
     terminating null character.  If this value is n or more, the contents of ws1 are indeterminate.

SEE ALSO
     setlocale(3), strxfrm(3), wcscmp(3), wcscoll(3), xlocale(3)

STANDARDS
     The wcsxfrm() function conforms to ISO/IEC 9899:1999 (``ISO C99'').

BUGS
     The current implementation of wcsxfrm() only works in single-byte LC_CTYPE locales, and falls back to
     using wcsncpy() in locales with extended character sets.

     Comparing two strings using wcscmp() after wcsxfrm() is not always equivalent to comparison with
     wcscoll(); wcsxfrm() only stores information about primary collation weights into ws1, whereas
     wcscoll() compares characters using both primary and secondary weights.

BSD                                            October 4, 2002                                           BSD