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kvisc/dos/str/strcmp.k
2019-05-31 21:25:56 +02:00

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; 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:
cmp b[ax0], b[ax1]
cjmpnz .1
test b[ax0], b[ax0]
cjmpz .1
inc ax0
inc ax1
jmp strcmp
.1:
mov rax, b[ax0]
sub rax, b[ax1]
sgn rax, rax
ret
;
; int strncmp(const char *str1, const char *str2, int maxn)
;
strncmp:
mov rcx, ax2
.1:
cmp b[ax0], b[ax1]
cjmpnz .1
test b[ax0], b[ax0]
cjmpz .1
inc ax0
inc ax1
loop strcmp
.1:
mov rax, b[ax0]
sub rax, b[ax1]
sgn rax, rax
ret