diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | ft_read.s | 6 | ||||
| -rw-r--r-- | ft_strcmp.s | 41 | ||||
| -rw-r--r-- | ft_strcpy.s | 20 | ||||
| -rw-r--r-- | ft_strlen.s | 6 | ||||
| -rw-r--r-- | ft_write.s | 6 | ||||
| -rw-r--r-- | main.c | 50 |
7 files changed, 99 insertions, 31 deletions
@@ -1,2 +1,3 @@ *.o a.out +*.dSYM @@ -0,0 +1,6 @@ +.globl _ft_read + +_ft_read: + mov rax, 0x2000003 + syscall + ret diff --git a/ft_strcmp.s b/ft_strcmp.s index 4c5aee7..216b56a 100644 --- a/ft_strcmp.s +++ b/ft_strcmp.s @@ -1,12 +1,35 @@ +.globl _ft_strcmp + _ft_strcmp: - mov eax, sp - mov ebx, sp + 8 + mov rax, rdi # s1 + mov rbx, rsi # s2 + xor rcx, rcx FT_STRCMP_LOOP: - cmp eax, 0 - jneq FT_STRCMP_LOOP - cmp ebx, 0 - jneq FT_STRCMP_LOOP - cmp eax, ebx - jeq FT_STRCMP_LOOP - sub eax, ebx + cmp byte ptr [rax + rcx], 0 + je FT_STRCMP_LOOP_END + cmp byte ptr [rbx + rcx], 0 + je FT_STRCMP_LOOP_END + mov dl, byte ptr [rax + rcx] + cmp dl, byte ptr [rbx + rcx] + jne FT_STRCMP_LOOP_END + inc rcx + jmp FT_STRCMP_LOOP + FT_STRCMP_LOOP_END: + mov dl, byte ptr [rax + rcx] + cmp dl, byte ptr [rbx + rcx] + jl FT_STRCMP_S1_LOWER + # s1 >= s2 + mov rdx, rax + xor rax, rax + mov al, [rdx + rcx] + sub al, [rbx + rcx] + ret + # s1 < s2 + FT_STRCMP_S1_LOWER: + mov rdx, rax + xor rax, rax + mov al, [rbx + rcx] + sub al, [rdx + rcx] + not eax # two's complement + inc eax ret diff --git a/ft_strcpy.s b/ft_strcpy.s index 2b7bbb9..228ea04 100644 --- a/ft_strcpy.s +++ b/ft_strcpy.s @@ -1,11 +1,13 @@ +.globl _ft_strcpy + _ft_strcpy: - pop ax - pop bx - mov ecx, eax ; copy -FT_STRCPY_LOOP: - mov [ecx], ebx - inc ebx - inc ecx - cmp ebx, 0 - jneq FT_STRCPY_LOOP + mov rax, rdi # dst + mov rbx, rsi # src + xor rcx, rcx + FT_STRCPY_LOOP: + mov dl, [rbx + rcx] + mov [rax + rcx], dl + inc rcx + cmp byte ptr [rbx + rcx], 0 + jne FT_STRCPY_LOOP ret diff --git a/ft_strlen.s b/ft_strlen.s index 82c0e34..c548d73 100644 --- a/ft_strlen.s +++ b/ft_strlen.s @@ -1,8 +1,8 @@ -.globl _ft_strlen +.globl _ft_strlen _ft_strlen: - mov rbx, rdi # first argument in rbx - xor rax, rax # rax = 0 + mov rbx, rdi # str argument + xor rax, rax FT_STRLEN_LOOP: cmp byte ptr [rbx + rax], 0 # compare rbx[rax] and '\0' je FT_STRLEN_RET @@ -1,4 +1,6 @@ +.globl _ft_write + _ft_write: - mov eax, 4 - int 0x80 + mov rax, 0x2000004 + syscall ret @@ -1,23 +1,57 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* main.c :+: :+: :+: */ +/* +:+ +:+ +:+ */ +/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ +/* +#+#+#+#+#+ +#+ */ +/* Created: 2019/11/22 02:02:24 by cacharle #+# #+# */ +/* Updated: 2019/11/22 02:14:53 by cacharle ### ########.fr */ +/* */ +/* ************************************************************************** */ + #include <stdio.h> int ft_strlen(char *); +char *ft_strcpy(char *dst, const char *src); +int ft_strcmp(const char *s1, const char *s2); +int ft_write(int, const void*, size_t); +int ft_read(int, void*, size_t); -/* extern void test(); */ int main() { - /* extern say_hi(); */ - char *a = ""; - char *b = "a"; + /* char *a = ""; */ + /* char *b = "a"; */ /* printf("%d\n", sizeof(char*)); */ /* printf("a: %p\n", (void*)a); */ /* printf("b: %p\n", (void*)a); */ /* extern ft_strlen("bonjour"); */ - printf("%d\n", ft_strlen(a)); - printf("%d\n", ft_strlen(b)); - printf("%d\n", ft_strlen("bonjour")); + /* printf("%d\n", ft_strlen(a)); */ + /* printf("%d\n", ft_strlen(b)); */ + /* printf("%d\n", ft_strlen("bonjour")); */ + + + /* char c[32] = "bon"; */ + /* char *d = "bonjourasdfasdf"; */ + /* */ + /* printf("%s\n", ft_strcpy(c, d)); */ + /* printf("%s\n", c); */ + + + char *e = "\x03"; + char *f = "\x02"; + printf("%d\n", ft_strcmp(e, f)); + printf("%d\n", strcmp(e, f)); + + /* ft_write(1, "bon\n", 4); */ + + /* char g[32]; */ + /* int ret = ft_read(0, g, 2); */ + /* g[ret] = 0; */ + /* printf("%s\n", g); */ + return 0; } - |