/* ACC -- Automatic Compiler Configuration

   Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   This software is a copyrighted work licensed under the terms of
   the GNU General Public License. Please consult the file "ACC_LICENSE"
   for details.

   Markus F.X.J. Oberhumer
   <markus@oberhumer.com>
   http://www.oberhumer.com/
 */


#define __ACCLIB_HMEMCPY_CH_INCLUDED 1
#if !defined(ACCLIB_PUBLIC)
#  define ACCLIB_PUBLIC(r,f)    r __ACCLIB_FUNCNAME(f)
#endif


/***********************************************************************
// memcmp, memcpy, memmove, memset
************************************************************************/

ACCLIB_PUBLIC(int, acc_hmemcmp) (const acc_hvoid_p s1, const acc_hvoid_p s2, acc_hsize_t len)
{
#if (ACC_HAVE_MM_HUGE_PTR) || !defined(HAVE_MEMCMP)
    const acc_hbyte_p p1 = (const acc_hbyte_p) s1;
    const acc_hbyte_p p2 = (const acc_hbyte_p) s2;

    if (len > 0) do
    {
        int d = *p1 - *p2;
        if (d != 0)
            return d;
        p1++; p2++;
    } while (--len > 0);
    return 0;
#else
    return memcmp(s1, s2, len);
#endif
}


ACCLIB_PUBLIC(acc_hvoid_p, acc_hmemcpy) (acc_hvoid_p dest, const acc_hvoid_p src, acc_hsize_t len)
{
#if (ACC_HAVE_MM_HUGE_PTR) || !defined(HAVE_MEMCPY)
    acc_hbyte_p p1 = (acc_hbyte_p) dest;
    const acc_hbyte_p p2 = (const acc_hbyte_p) src;

    if (len <= 0 || p1 == p2)
        return dest;
    do
        *p1++ = *p2++;
    while (--len > 0);
    return dest;
#else
    return memcpy(dest, src, len);
#endif
}


ACCLIB_PUBLIC(acc_hvoid_p, acc_hmemmove) (acc_hvoid_p dest, const acc_hvoid_p src, acc_hsize_t len)
{
#if (ACC_HAVE_MM_HUGE_PTR) || !defined(HAVE_MEMMOVE)
    acc_hbyte_p p1 = (acc_hbyte_p) dest;
    const acc_hbyte_p p2 = (const acc_hbyte_p) src;

    if (len <= 0 || p1 == p2)
        return dest;

    if (p1 < p2)
    {
        do
            *p1++ = *p2++;
        while (--len > 0);
    }
    else
    {
        p1 += len;
        p2 += len;
        do
            *--p1 = *--p2;
        while (--len > 0);
    }
    return dest;
#else
    return memmove(dest, src, len);
#endif
}


ACCLIB_PUBLIC(acc_hvoid_p, acc_hmemset) (acc_hvoid_p s, int c, acc_hsize_t len)
{
#if (ACC_HAVE_MM_HUGE_PTR) || !defined(HAVE_MEMSET)
    acc_hbyte_p p = (acc_hbyte_p) s;

    if (len > 0) do
        *p++ = (unsigned char) c;
    while (--len > 0);
    return s;
#else
    return memset(s, c, len);
#endif
}


/*
vi:ts=4:et
*/