strncpy.s

来自「一个操作系统,用C语言实现开发的,我在一个浙江大学的操作系统实验网站找到.大家学」· S 代码 · 共 36 行

# Kernel Library
# strncpy

.include "f_asm.inc"

.text

.global _strncpy

_strncpy:
	ENTER
		pushl %esi
		movl %edi, %edx
		
		movl LEN(%ebp), %ecx
		movl SRC(%ebp), %esi
		movl DES(%ebp), %edi
		
		cmpl %esi, %edi
		jz done
		
		cld	
next:
		lodsb
		stosb
		cmpb $0, %al
		loopnz next
				
done:
		movl %edx, %edi
		popl %esi
		movl DES(%ebp), %eax
				
	LEAVE
		ret