[deliverable/binutils-gdb.git] / libiberty / bcopy.c

/* bcopy -- copy memory regions of arbitary length

NAME
	bcopy -- copy memory regions of arbitrary length

SYNOPSIS
	void bcopy (char *in, char *out, int length)

DESCRIPTION
	Copy LENGTH bytes from memory region pointed to by IN to memory
	region pointed to by OUT.

BUGS
	Significant speed improvements can be made in some cases by
	implementing copies of multiple bytes simultaneously, or unrolling
	the copy loop.

*/

void
bcopy (src, dest, len)
  register char *src, *dest;
  int len;
{
  if (dest < src)
    while (len--)
      *dest++ = *src++;
  else
    {
      char *lasts = src + (len-1);
      char *lastd = dest + (len-1);
      while (len--)
        *(char *)lastd-- = *(char *)lasts--;
    }
}
Commit	Line	Data
252b5132 RH	1	/* bcopy -- copy memory regions of arbitary length
	2
	3	NAME
	4	bcopy -- copy memory regions of arbitrary length
	5
	6	SYNOPSIS
	7	void bcopy (char in, char out, int length)
	8
	9	DESCRIPTION
	10	Copy LENGTH bytes from memory region pointed to by IN to memory
	11	region pointed to by OUT.
	12
	13	BUGS
	14	Significant speed improvements can be made in some cases by
	15	implementing copies of multiple bytes simultaneously, or unrolling
	16	the copy loop.
	17
	18	*/
	19
	20	void
	21	bcopy (src, dest, len)
	22	register char src, dest;
	23	int len;
	24	{
	25	if (dest < src)
	26	while (len--)
	27	dest++ = src++;
	28	else
	29	{
	30	char *lasts = src + (len-1);
	31	char *lastd = dest + (len-1);
	32	while (len--)
	33	(char )lastd-- = (char )lasts--;
	34	}
	35	}