$NetBSD: wctomb.3,v 1.3 2003/04/16 13:34:41 wiz Exp $
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.Dd $Mdocdate: June 28 2016 $ .Dt WCTOMB 3 .Os .Sh NAME .Nm wctomb .Nd converts a wide character to a multibyte character .Sh SYNOPSIS n stdlib.h .Ft int .Fn wctomb "char * s" "wchar_t wchar" .Sh DESCRIPTION The .Fn wctomb function converts the wide character .Fa wchar to the corresponding multibyte character, and stores it in the array pointed to by .Fa s . .Fn wctomb may store at most .Dv MB_CUR_MAX bytes in the array.
p In state-dependent encoding, .Fn wctomb may store the special sequence to change the conversion state before an actual multibyte character into the array pointed to by .Fa s . If .Fa wchar is a null wide character
q Sq \e0 , this function places its own internal state to an initial conversion state.
p Calling any other functions in .Em libc never change the internal state of .Fn wctomb , except for calling .Xr setlocale 3 with the .Dv LC_CTYPE category changed to that of the current locale. Such .Xr setlocale 3 calls cause the internal state of this function to be indeterminate.
p The behaviour of .Fn wctomb is affected by .Dv LC_CTYPE category of the current locale.
p There is a special case: l -tag -width 012345678901 t s == NULL .Fn wctomb initializes its own internal state to an initial state, and determines whether the current encoding is state-dependent. This function returns 0 if the encoding is state-independent, otherwise non-zero. In this case, .Fa wchar is completely ignored. .El .Sh RETURN VALUES Normally, .Fn wctomb returns: l -tag -width 012345678901 t positive Number of bytes for the valid multibyte character pointed to by .Fa s . There are no cases where the value returned is greater than the value of the .Dv MB_CUR_MAX macro. t -1 .Fa wchar is an invalid wide character. .El
p If .Fa s is equal to .Dv NULL , .Fn wctomb returns: l -tag -width 0123456789 t 0 The current encoding is state-independent. t non-zero The current encoding is state-dependent. .El .Sh ERRORS No errors are defined. .Sh SEE ALSO .Xr setlocale 3 .Sh STANDARDS The .Fn wctomb function conforms to .St -ansiC .