41 lines
927 B
ArmAsm
41 lines
927 B
ArmAsm
/* _strncat() Author: Kees J. Bot */
|
|
/* 1 Jan 1994 */
|
|
|
|
/* char *_strncat(char *s1, const char *s2, size_t edx) */
|
|
/* Append string s2 to s1. */
|
|
/* */
|
|
.text
|
|
.globl __strncat
|
|
.balign 16
|
|
__strncat:
|
|
push %ebp
|
|
movl %esp, %ebp
|
|
push %esi
|
|
push %edi
|
|
movl 8(%ebp), %edi /* String s1 */
|
|
movl $-1, %ecx
|
|
xorb %al, %al /* Null byte */
|
|
cld
|
|
|
|
repne scasb /* Look for the zero byte in s1 */
|
|
decl %edi /* Back one up (and clear 'Z' flag) */
|
|
push %edi /* Save end of s1 */
|
|
movl 12(%ebp), %edi /* edi = string s2 */
|
|
movl %edx, %ecx /* Maximum count */
|
|
|
|
repne scasb /* Look for the end of s2 */
|
|
jne no0
|
|
incl %ecx /* Exclude null byte */
|
|
no0:
|
|
subl %ecx, %edx /* Number of bytes in s2 */
|
|
movl %edx, %ecx
|
|
movl 12(%ebp), %esi /* esi = string s2 */
|
|
pop %edi /* edi = end of string s1 */
|
|
|
|
rep movsb /* Copy bytes */
|
|
stosb /* Add a terminating null */
|
|
movl 8(%ebp), %eax /* Return s1 */
|
|
pop %edi
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|