mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-28 09:19:41 +03:00
49cb0f914d
devman: scan pci root bus git-svn-id: svn://kolibrios.org@1627 a494cfbc-eb01-0410-851d-a64ba20cac60
35 lines
723 B
ArmAsm
35 lines
723 B
ArmAsm
/* strncmp() Author: Kees J. Bot */
|
|
/* 1 Jan 1994 */
|
|
|
|
/* int strncmp(const char *s1, const char *s2, size_t ecx) */
|
|
/* Compare two strings. */
|
|
/* */
|
|
#include "asm.h"
|
|
|
|
ENTRY(_strncmp)
|
|
push %ebp
|
|
movl %esp, %ebp
|
|
push %esi
|
|
push %edi
|
|
testl %ecx, %ecx /* Max length is zero? */
|
|
je done
|
|
movl 8(%ebp), %esi /* esi = string s1 */
|
|
movl 12(%ebp), %edi /* edi = string s2 */
|
|
cld
|
|
compare:
|
|
cmpsb /* Compare two bytes */
|
|
jne done
|
|
cmpb $0, -1(%esi) /* End of string? */
|
|
je done
|
|
decl %ecx /* Length limit reached? */
|
|
jne compare
|
|
done:
|
|
seta %al /* al = (s1 > s2) */
|
|
setb %ah /* ah = (s1 < s2) */
|
|
subb %ah, %al
|
|
movsbl %al, %eax /* eax = (s1 > s2) - (s1 < s2), i.e. -1, 0, 1 */
|
|
pop %edi
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|