usr: libc: Add initial ctype.h

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 94 insertions, 0 deletions

diff --git a/lib/libc/include/ctype.h b/lib/libc/include/ctype.h
new file mode 100644
index 0000000..2348852
--- /dev/null
+++ b/lib/libc/include/ctype.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CTYPE_H
+#define _CTYPE_H 1
+
+#include <sys/param.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+__always_inline static inline int
+__tolower(int c)
+{
+    return c | 0x20;
+}
+
+__always_inline static inline int
+__toupper(int c)
+{
+    return c & ~0x20;
+}
+
+__always_inline static inline int
+__isalpha(int c)
+{
+    c = __tolower(c);
+    return c >= 'a' && c <= 'z';
+}
+
+__always_inline static inline int
+__isdigit(int c)
+{
+    return c >= '0' && c <= '9';
+}
+
+__always_inline static inline int
+__isspace(int c)
+{
+    switch (c) {
+    case ' ':
+    case '\t':
+    case '\n':
+    case '\r':
+    case '\v':
+        return 1;
+
+    return 0;
+}
+
+__END_DECLS
+
+/* Conver char to lowercase */
+#define tolower(C) __tolower((C))
+
+/* Conver char to uppercase */
+#define toupper(C) __toupper((C))
+
+/* Is alphabetical? */
+#define isalpha(C) __isalpha((C))
+
+/* Is a digit? */
+#define isdigit(C) __isdigit((C))
+
+/* Is a space? */
+#define isspace(C) __isspace((C))
+
+#endif  /* _CTYPE_H */