strw_lcase.c

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/* lcasew$ function */

#include "fb.h"

FBCALL FB_WCHAR *fb_WstrLcase2( const FB_WCHAR *src, int mode )
{
        FB_WCHAR *dst, *d;
        const FB_WCHAR *s;
        FB_WCHAR c;
        ssize_t chars, i;

        if( src == NULL )
                return NULL;

        chars = fb_wstr_Len( src );

        /* alloc temp string */
        dst = fb_wstr_AllocTemp( chars );
        if( dst == NULL )
                return NULL;

        s = src;
        d = dst;

        if( mode == 1 ) {
                for( i = 0; i < chars; i++ ) {
                        c = *s++;
                        if( (c >= 65) && (c <= 90) )
                                c += 97 - 65;
                        *d++ = c;
                }
        } else {
                for( i = 0; i < chars; i++ ) {
                        c = *s++;
                        if( fb_wstr_IsUpper( c ) )
                                c = fb_wstr_ToLower( c );
                        *d++ = c;
                }
        }

        /* null char */
        *d = _LC('\0');

        return dst;
}