1 files changed, 31 insertions, 0 deletions
diff --git a/lume-legacy/include/ulib/ctypes.h b/lume-legacy/include/ulib/ctypes.h
new file mode 100644
index 0000000..1ec204e
--- /dev/null
+++ b/lume-legacy/include/ulib/ctypes.h
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
+
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    static inline int isdigit(int c) { return c >= '0' && c <= '9'; }
+    static inline int islower(int c) { return c >= 'a' && c <= 'z'; }
+    static inline int isupper(int c) { return c >= 'A' && c <= 'Z'; }
+    static inline int isalpha(int c) { return islower(c) || isupper(c); }
+    static inline int isalnum(int c) { return isalpha(c) || isdigit(c); }
+    static inline int isspace(int c) { return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; }
+    static inline int isprint(int c) { return c >= 32 && c <= 126; }
+    static inline int iscntrl(int c) { return c < 32 || c == 127; }
+    static inline int isxdigit(int c) { return isdigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); }
+
+    static inline int tolower(int c) { return isupper(c) ? c + 32 : c; }
+    static inline int toupper(int c) { return islower(c) ? c - 32 : c; }
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+\ No newline at end of file