1 files changed, 5 insertions, 0 deletions
diff --git a/include/al/lib.h b/include/al/lib.h
index 8e16700..6e21510 100644
--- a/include/al/lib.h
+++ b/include/al/lib.h
@@ -207,6 +207,11 @@ static inline bool al_isspace(char c)
     return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v');
 }
 
+static inline bool al_isnumber(char c)
+{
+    return c >= '0' && c <= '9';
+}
+
 // ASCII-only.
 static inline bool al_isupper(char c)
 {