atoi, for kill

e204d0a1 · rsc · e0924827 · e204d0a1 · e204d0a1
--- a/ulib.c
+++ b/ulib.c
@@ -88,3 +88,14 @@ stat(char *n, struct stat *st)
  close(fd);
  return r;
 }
+
+int
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+  while('0' <= *s && *s <= '9')
+    n = n*10 + *s++ - '0';
+  return n;
+}
--- a/user.h
+++ b/user.h
@@ -31,3 +31,4 @@ unsigned int strlen(char*);
 void* memset(void*, int, unsigned int);
 void* malloc(uint);
 void free(void*);
+int atoi(const char*);