keii.dev
1#include <stdlib.h>
2#include <string.h>
3
4int atoi(const char* s)
5{
6 // FIXME: Add overflow checks
7 int res = 0;
8 int len = strlen(s);
9 int mul = 1;
10 for (int i = 0; i < len; i++) {
11 mul *= 10;
12 }
13 for (int i = 0; i < len; i++) {
14 mul /= 10;
15 res += (s[i] - '0') * mul;
16 }
17 return res;
18}