Adds strlcpy()

string.asm

@@ -1,6 +1,7 @@
 section	.text
 	global	strlen
 	global	strcpy
+	global	strlcpy
 	global	strcat
 	global	strcmp
 
@@ -48,6 +49,36 @@ strcpy:
 	.quit:
 	leave
 	ret
+;----- strlcpy(char* dest, char* src, int size) -----;
+; return value: Length of src
+strlcpy:
+	push	rbp
+	mov	rbp, rsp
+
+	mov	r9, rsi
+	test	rdx, rdx
+	jz	.quit
+	js	.quit
+	dec	rdx
+	.loop:
+		cmp	byte [rsi], 0x0
+		je	.0f
+		mov	r10b, byte [rsi]
+		mov	byte [rdi], r10b
+		inc	rsi
+		inc	rdi
+		dec	rdx
+		cmp	rdx, 0x0
+		ja	.loop
+
+	.0f:
+	mov	byte [rdi], 0x0
+
+	.quit:
+	mov	rdi, r9
+	call	strlen
+	leave
+	ret
 ;----- strcat(char* dest, char* src) -----;
 ; return value: pointer to dest
 strcat:

tests.asm

@@ -15,6 +15,7 @@ extern	puts
 ;string.asm
 extern	strlen
 extern	strcpy
+extern	strlcpy
 extern	strcat
 extern	strcmp
 
@@ -29,6 +30,7 @@ section	.rodata
 	TEST_islower	equ	1
 	TEST_isupper	equ	1
 	TEST_strcpy	equ	1
+	TEST_strlcpy	equ	1
 	TEST_strcat	equ	1
 	TEST_tolower	equ	1
 	TEST_toupper	equ	1
@@ -57,6 +59,9 @@ section	.rodata
 	msgIsupper	db	"isupper(str1[0]): %d",10,0
 	msgIsupper2	db	"isupper(str1[1]): %d",10,0
 	msgStrcpy	db	"strcpy(strBuff, str1): %s",10,0
+	msgStrlcpy	db	"strlcpy(strBuff2, str1, -1): (%d): %s",10,0
+	msgStrlcpy2	db	"strlcpy(strBuff2, str1, 0): (%d): %s",10,0
+	msgStrlcpy3	db	"strlcpy(strBuff2, str1, 8): (%d): %s",10,0
 	msgStrcat	db	"strcat(strBuff, str3): %s",10,0
 	msgStrlen3	db	"strlen(strBuff): %d",10,0
 	msgTolower	db	"tolower(str1[0]): %c",10,0
@@ -71,6 +76,7 @@ section	.rodata
 section	.data
 section	.bss
 	strBuff		resb	32
+	strBuff2	resb	5
 section .text
 	global main
 main:
@@ -215,6 +221,38 @@ main:
 	lea	rsi, [rel strBuff]
 	call	printf
 %ENDIF
+%IF TEST_strlcpy
+	; TEST: strlcpy(strBuff2, str1, -1)
+	lea	rdi, [rel strBuff2]
+	lea	rsi, [rel str1]
+	mov	rdx, -1
+	call	strlcpy
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgStrlcpy]
+	lea	rdx, [rel strBuff2]
+	call	printf
+	; TEST: strlcpy(strBuff2, str1, 0)
+	lea	rdi, [rel strBuff2]
+	lea	rsi, [rel str1]
+	mov	rdx, 0
+	call	strlcpy
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgStrlcpy2]
+	lea	rdx, [rel strBuff2]
+	call	printf
+	; TEST: strlcpy(strBuff2, str1, 8)
+	lea	rdi, [rel strBuff2]
+	lea	rsi, [rel str1]
+	mov	rdx, 5
+	call	strlcpy
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgStrlcpy3]
+	lea	rdx, [rel strBuff2]
+	call	printf
+%ENDIF
 %IF TEST_strcat
 	; TEST: strcat()
 	lea	rdi, [rel strBuff]