minix/lib/libc/arch/i386/string/_strncpy.S
Arun Thomas 9a21d1a2fd Macros for symbols used in both ASM and C
-The macros take care of prepending the leading underscore when
 necessary.
2010-08-17 16:44:07 +00:00

22 lines
569 B
ArmAsm

/* _strncpy() Author: Kees J. Bot */
/* 1 Jan 1994 */
/* char *_strncpy(char *s1, const char *s2, size_t ecx) */
/* Copy string s2 to s1. */
/* */
#include <machine/asm.h>
ENTRY(_strncpy)
movl 12(%ebp), %edi /* edi = string s2 */
xorb %al, %al /* Look for a zero byte */
movl %ecx, %edx /* Save maximum count */
cld
repne scasb /* Look for end of s2 */
subl %ecx, %edx /* Number of bytes in s2 including null */
xchgl %edx, %ecx
movl 12(%ebp), %esi /* esi = string s2 */
movl 8(%ebp), %edi /* edi = string s1 */
rep movsb /* Copy bytes */
ret