Added most of ctype.h (missing toupper & tolower)

2024-10-19 15:11:54 +02:00
parent 77e16e9605
commit 3c20633acb
2 changed files with 164 additions and 0 deletions
@@ -0,0 +1,49 @@
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+/* Bitfield values
+     Property   | Bit 
+    ------------|-----
+     Digit      |  0
+     Letter     |  1
+     Lowercase  |  2
+     Punct      |  3
+     Space      |  4
+     Control    |  5
+     Printable  |  6
+     Hex digit  |  7
+ */
+#define _DIGIT_MASK (1<<0)
+#define _ALPHA_MASK (1<<1)
+#define _LOWER_MASK (1<<2)
+#define _PUNCT_MASK (1<<3)
+#define _SPACE_MASK (1<<4)
+#define _CNTRL_MASK (1<<5)
+#define _PRINT_MASK (1<<6)
+#define _HEXDG_MASK (1<<7)
+
+// A table for the ASCII character set
+extern const unsigned char _CTYPE_TABLE[256];
+
+// Just a macro to make this easier
+#define _CTYPE_CHECK(_c, _mask)    (_CTYPE_TABLE[(unsigned char)(_c)] & (_mask))
+
+#define isalnum(_c) (isalpha((_c)) || isdigit((_c))
+#define isalpha(_c) _CTYPE_CHECK((_c), _ALPHA_MASK)
+#define islower(_c) _CTYPE_CHECK((_c), _LOWER_MASK)
+#define isupper(_c) (!islower((_c)) && isalpha((_c)))
+#define isdigit(_c) _CTYPE_CHECK((_c), _DIGIT_MASK)
+#define iscntrl(_c) _CTYPE_CHECK((_c), _CNTRL_MASK)
+#define isgraph(_c) (!isblank((_c)))
+#define isspace(_c) _CTYPE_CHECK((_c), _SPACE_MASK)
+#define isblank(_c) (iscntrl((_c)) || isspace((_c)))
+#define isprint(_c) _CTYPE_CHECK((_c), _PRINT_MASK)
+#define ispunct(_c) _CTYPE_CHECK((_c), _PUNCT_MASK)
+// Why is this one's name longer :((
+#define isxdigit(_c) _CTYPE_CHECK((_c), _HEXDG_MASK);
+
+// TODO:
+// tolower()
+// toupper()
+
+#endif