「🏗️」 wip(str*): working on them, strcmp doesn't work the rest does i think

src/str/ft_strcmp.s

@@ -0,0 +1,32 @@
+section .text
+global ft_strcmp
+
+; int	ft_strcmp(const char *s1, const char *s2)
+ft_strcmp:
+	mov		rax, 0
+	cmp		rdi, 0
+	je		.ret
+	cmp		rsi, 0
+	je		.ret
+
+.loop:
+
+	mov		r10b, BYTE [rdi]
+	cmp		r10b, BYTE [rsi]
+	je		.end
+
+	cmp		BYTE [rdi], 0
+	je		.end
+	cmp		BYTE [rsi], 0
+	je		.end
+
+	inc		rsi
+	inc		rdi
+	jmp		.loop
+
+.end:
+	mov	al, BYTE [rsi]
+	mov	r10b, BYTE [rdi]
+	sub		rax, r10
+.ret:
+	ret

src/str/ft_strcpy.s

@@ -0,0 +1,28 @@
+section .text
+global ft_strcpy
+
+; char	*ft_strcpy(char *dest, const char *src)
+ft_strcpy:
+	mov rax, 0
+	cmp rdi, 0
+	je .end
+	cmp rsi, 0
+	je .end
+
+	mov rax, rdi
+
+.loop:
+	mov r10b, BYTE [rsi]
+	cmp r10b, 0
+	je .end_loop
+
+	mov BYTE [rdi], r10b
+	inc rsi
+	inc rdi
+	jmp .loop
+
+.end_loop:
+	mov BYTE [rdi], 0
+
+.end:
+	ret

src/str/ft_strlen.s

@@ -0,0 +1,18 @@
+section .text
+global ft_strlen
+
+; size_t	ft_strlen(const char *str)
+ft_strlen:
+	mov rax, rdi
+	cmp rdi, 0
+	je .end
+
+.loop:
+	cmp BYTE [rax], 0
+	je .end
+	inc rax
+	jmp .loop
+
+.end:
+	sub rax, rdi
+	ret

src/str/main.c

@@ -0,0 +1,30 @@
+int		ft_strlen(char *str);
+char	*ft_strcpy(char *dest, const char *src);
+int		ft_strcmp(const char *s1, const char *s2);
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int	main(void)
+{
+	printf("\n--- ft_strlen ---\n");
+	printf("arg : \"i love kissing girls\" | result : %d\n", ft_strlen("i love kissing girls"));
+	printf("arg : NULL | result : %d\n", ft_strlen(NULL));
+	printf("arg : \"\" | result : %d\n", ft_strlen(""));
+
+	printf("\n--- ft_strcpy ---\n");
+	char *a1 = calloc(sizeof(char), 10);
+	char *a2 = calloc(sizeof(char), 10);
+	printf("arg : \"abcdefgh\" | result : %s\n", ft_strcpy(a1, "abcdefgh"));
+	printf("arg : \"abcdefgh\" | result : %s\n", strcpy(a2, "abcdefgh"));
+	printf("arg : \"67\" | result : %s\n", ft_strcpy(a1, "67"));
+	printf("arg : \"67\" | result : %s\n", strcpy(a2, "67"));
+	printf("arg : \"aaa\" (dest = NULL) | result : %s\n", ft_strcpy(NULL, "67"));
+	printf("arg : NULL | result : %s\n", ft_strcpy(a2, NULL));
+
+
+	printf("\n--- ft_strcmp ---\n");
+	printf("arg : \"aaaaaa\" \"aaaa\" | result : %d (expected : %d)\n", ft_strcmp("aaaaaa", "aaaa"), strcmp("aaaaaa", "aaaa"));
+	printf("arg : \"aaaa\" \"bb\" | result : %d (expected : %d)\n", ft_strcmp("aaaa", "bb"), strcmp("aaaa", "bb"));
+}