From 320e1f5825393d83a7c494b24a6ba37380e8204c Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Thu, 30 Oct 2025 11:57:59 -0400
Subject: lib: Internalize isupper/lower()

Signed-off-by: Andrew Opalach <andrew@akon.city>
---
 include/al/lib.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'include')

diff --git a/include/al/lib.h b/include/al/lib.h
index f5379e5..71a6f7d 100644
--- a/include/al/lib.h
+++ b/include/al/lib.h
@@ -46,7 +46,6 @@
 #include <wchar.h>
 #include <stdio.h>
 #include <stdarg.h>
-#include <ctype.h>
 
 #ifdef AL_MEMORY_TRACKING
 void al_malloc_init(void);
@@ -206,14 +205,15 @@ static inline bool al_isspace(char c)
     return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v');
 }
 
+// ASCII-only.
 static inline bool al_isupper(char c)
 {
-    return isupper(c);
+    return c >= 'A' && c <= 'Z';
 }
 
 static inline bool al_islower(char c)
 {
-    return islower(c);
+    return c >= 'a' && c <= 'z';
 }
 
 static inline char al_tolower(char c)
-- 
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