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Man Pages


Manual Reference Pages  -  WCSXFRM (3)

NAME

wcsxfrm - transform a wide string under locale

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In wchar.h size_t wcsxfrm wchar_t * restrict dst const wchar_t * restrict src size_t n

DESCRIPTION

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

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

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 dst are indeterminate.

SEE ALSO

setlocale(3), strxfrm(3), wcscmp(3), wcscoll(3)

STANDARDS

The wcsxfrm function conforms to -isoC-99.

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 dst, whereas wcscoll compares characters using both primary and secondary weights.

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