start project

Makefile

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+NAME ?= libasm.a
+
+SRCS_DIR = srcs
+OBJS_DIR = .objs
+
+SRCS_NAMES =	ft_strlen.s\
+	   			ft_strcpy.s\
+	   			ft_strcmp.s\
+	   			ft_write.s\
+	   			ft_read.s\
+	   			ft_strdup.s
+
+SRCS = $(addprefix $(SRCS_DIR)/, $(SRCS_NAMES))
+
+OBJS = $(addprefix $(OBJS_DIR)/, $(SRCS_NAMES:.s=.o))
+
+all: $(NAME)
+	
+test: test.c $(NAME)
+	gcc -o test.o -c test.c
+	ld tests.c -L. -lasm
+
+$(NAME): $(OBJS_DIR) $(OBJS)
+	ar rcs $@ $(OBJS)
+
+$(OBJS_DIR):
+	mkdir -p $(OBJS_DIR)
+
+$(OBJS_DIR)/%.o: $(SRCS_DIR)/%.s
+	nasm -o $@ $<
+
+clean:
+	rm -rf $(OBJS_DIR)
+
+fclean: clean
+	rm -f $(NAME) test
+
+.PHONY: fclean clean all

ft_strlen.s

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+section .text
+	global ft_strlen
+
+ft_strlen:
+	test rdi, rdi
+	je err
+	mov rsi, rdi
+	jmp loop_start
+
+increase_pointer:
+	lea rsi, [rsi + 1]
+
+loop_start:
+	mov al, [rsi]
+	test al, al
+	jnz increase_pointer
+end:
+	sub rsi, rdi 
+	mov rax, rsi
+	ret
+
+err:
+	xor rax, rax
+	ret

srcs/ft_strlen.s

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+section .text
+	global ft_strlen
+
+ft_strlen:
+	test rdi, rdi
+	je err
+	mov rsi, rdi
+	jmp loop_start
+
+increase_pointer:
+	lea rsi, [rsi + 1]
+
+loop_start:
+	mov al, [rsi]
+	test al, al
+	jnz increase_pointer
+end:
+	sub rsi, rdi 
+	mov rax, rsi
+	ret
+
+err:
+	xor rax, rax
+	ret

tests.c

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+#include <stdlib.h>
+#include <stdio.h>
+
+size_t ft_strlen(char *str);
+
+void test_strlen(void)
+{
+	int nb_tests;
+	int passed;
+
+	nb_tests = 3;
+	passed = 0;
+	
+	if(ft_strlen("hello") == 5)
+		passed++;
+	if(ft_strlen("") == 0)
+		passed++;
+	if(ft_strlen(NULL) == 0)
+		passed++;
+	
+
+}
+
+int main(void)
+{
+	test_strlen();	
+}