bcopy.c

来自「mips架构的bootloader,99左右的版本 但源代码现在没人更新了」· C语言 代码 · 共 28 行

/*************************************************************
 * File: lib/bcopy.c
 * Purpose: Part of C runtime library
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	970304	Start of revision history
 */

/*
** This routine should be rewritten in assembly language to
** improve performance.
*/

/** bcopy(src,dst,bytes) copy bytes from src to destination */
bcopy(src,dst,bytes)
char *src,*dst;
int bytes;
{

if (dst < src) for (;bytes>0;bytes--) *dst++ = *src++;
else {
	dst += (bytes-1);
	src += (bytes-1);
	for (;bytes>0;bytes--) *dst-- = *src--;
	}
}