LibC: Add more functions that support "long long" integers

1 files changed, 7 insertions, 4 deletions

diff --git a/userland/libc/stdlib/strtol.c b/userland/libc/stdlib/strtol.c
index 09a5ad7..30d04ec 100644
--- a/userland/libc/stdlib/strtol.c
+++ b/userland/libc/stdlib/strtol.c
@@ -4,8 +4,7 @@
 #include <limits.h>
 #include <stdlib.h>
 
-extern int errno;
-extern int get_value(char c, long base);
+int get_value(char c, long base);
 
 // https://pubs.opengroup.org/onlinepubs/9699919799/functions/strtol.html
 long strtol(const char *str, char **restrict endptr, int base) {
@@ -35,11 +34,15 @@ long strtol(const char *str, char **restrict endptr, int base) {
 
   if (2 <= base && 36 >= base) {
     for (; *str; str++) {
+      if (ret_value > LONG_MAX / base) {
+        errno = ERANGE;
+        return LONG_MAX;
+      }
       ret_value *= base;
       int val = get_value(*str, base);
       if (ret_value > LONG_MAX - val) {
         errno = ERANGE;
-        return 0;
+        return LONG_MAX;
       }
       ret_value += val;
     }
@@ -48,6 +51,6 @@ long strtol(const char *str, char **restrict endptr, int base) {
     return 0;
   }
   if (endptr)
-    *endptr = (char*)str;
+    *endptr = (char *)str;
   return ret_value;
 }