strw_trim.c

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/* trimw$ function */

#include "fb.h"

FBCALL FB_WCHAR *fb_WstrTrim ( const FB_WCHAR *src )
{
        FB_WCHAR *dst;
        const FB_WCHAR *p;
        ssize_t chars;

        if( src == NULL )
                return NULL;

        chars = fb_wstr_Len( src );
        if( chars <= 0 )
                return NULL;

        p = fb_wstr_SkipCharRev( src, chars, _LC(' ') );
        chars = fb_wstr_CalcDiff( src, p ) + 1;
        if( chars <= 0 )
                return NULL;

        p = fb_wstr_SkipChar( src, chars, _LC(' ') );
        chars -= fb_wstr_CalcDiff( src, p );
        if( chars <= 0 )
                return NULL;

        /* alloc temp string */
    dst = fb_wstr_AllocTemp( chars );
        if( dst != NULL )
        {
                /* simple copy */
                fb_wstr_Copy( dst, p, chars );
        }

        return dst;
}