include/ruby/internal/ctype.h: add doxygen

Must not be a bad idea to improve documents.

1 files changed, 7 insertions, 0 deletions

diff --git a/util.c b/util.c
index 0c8de209cb..1b11ecb3f5 100644
--- a/util.c
+++ b/util.c
@@ -97,6 +97,8 @@ NO_SANITIZE("unsigned-integer-overflow", extern unsigned long ruby_scan_digits(c
 unsigned long
 ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow)
 {
+    RBIMPL_ASSERT_OR_ASSUME(base >= 2);
+    RBIMPL_ASSERT_OR_ASSUME(base <= 36);
 
     const char *start = str;
     unsigned long ret = 0, x;
@@ -136,6 +138,11 @@ ruby_strtoul(const char *str, char **endptr, int base)
     unsigned long ret;
     const char *subject_found = str;
 
+    if (base < 0) {
+        errno = EINVAL;
+        return 0;
+    }
+
     if (base == 1 || 36 < base) {
         errno = EINVAL;
         return 0;