ref: 10784c7106b0538ad853c421daf33c0d6597ff5d dir: /libc/atoi.c/
#include <u.h> #include <libc.h> /* doesn't handle - */ int atoi(char *s) { int n = 0; while(*s > '9' || *s < '0') { n += *s - '0'; } return n; }