swap_mem.c

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/* swap for non-strings */

#include "fb.h"

FBCALL void fb_MemSwap( unsigned char *dst, unsigned char *src, ssize_t bytes )
{
        ssize_t i;
        unsigned int ti;
        unsigned char tb;

        if( (dst == NULL) || (src == NULL) || (bytes <= 0) )
                return;

        FB_LOCK();
        
        /* words */
        for( i = 0; i < (bytes >> 2); i++ )
        {
                ti = *(unsigned int *)src;
                *(unsigned int *)src = *(unsigned int *)dst;
                *(unsigned int *)dst = ti;

                src += sizeof(unsigned int);
                dst += sizeof(unsigned int);
        }

        /* remainder */
        for( i = 0; i < (bytes & 3); i++ )
        {
                tb = *src;
                *src++ = *dst;
                *dst++ = tb;
        }
        
        FB_UNLOCK();
}