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kvisc/ka/crt/str/strcmp.k
julianb0 8796f78bf5
abi
2019-06-15 20:21:38 +02:00

32 lines
691 B
Plaintext

; The OS/K Team licenses this file to you under the MIT license.
; See the LICENSE file in the project root for more information.
;
; int strcmp(const char *str1, const char *str2)
;
; Returns:
; 0 if the contents of both strings are equal
; 1 if the first character that does not match has a greater value in str1 than in str2
; -1 if the first character that does not match has a lower value in str1 than in str2
;
strcmp:
mov ax2, STRLEN_MAX
jmp strncmp
;
; int strncmp(const char *str1, const char *str2, int maxn)
;
strncmp:
mov rcx, ax2
mov.cxz rax, 0
ret.cxz
rep.e cmpzsb ax0, ax1
mov rax, b[ax0]
sub rax, b[ax1]
sgn rax, rax
ret