Added lib folder for general stuff, introduced as target to Makefile

lib/base.h

@@ -0,0 +1,70 @@
+/* Copyright (C) 2023 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the GPLv2
+ * license.  You should have received a copy of the GPLv2 license with
+ * this file.  If not, please write to: aryadev@aryadevchavali.com.
+
+ * Created: 2023-10-15
+ * Author: Aryadev Chavali
+ * Description: Basic types and routines
+ */
+
+#ifndef BASE_H
+#define BASE_H
+
+#include <stdint.h>
+
+#define ARR_SIZE(xs) (sizeof(xs) / sizeof(xs[0]))
+#define MAX(a, b)    ((a) > (b) ? (a) : (b))
+#define MIN(a, b)    ((a) > (b) ? (b) : (a))
+
+// Flags
+#ifndef VERBOSE
+#define VERBOSE 0
+#endif
+
+typedef uint64_t u64;
+typedef uint32_t u32;
+typedef int32_t i32;
+typedef int64_t i64;
+typedef float f32;
+typedef double f64;
+
+typedef uint8_t byte;
+typedef u32 hword;
+typedef u64 word;
+
+typedef union
+{
+  byte as_byte;
+  hword as_hword;
+  word as_word;
+} data_t;
+
+typedef enum
+{
+  DATA_TYPE_NIL = 0,
+  DATA_TYPE_BYTE,
+  DATA_TYPE_HWORD,
+  DATA_TYPE_WORD,
+} data_type_t;
+
+#define DBYTE(BYTE)   ((data_t){.as_byte = (BYTE)})
+#define DHWORD(HWORD) ((data_t){.as_hword = (HWORD)})
+#define DWORD(WORD)   ((data_t){.as_word = (WORD)})
+
+#define HWORD_SIZE sizeof(hword)
+#define WORD_SIZE  sizeof(word)
+
+// Macros to extract the nth byte or nth hword from a word
+#define WORD_NTH_BYTE(WORD, N)  (((WORD) >> ((N)*8)) & 0xff)
+#define WORD_NTH_HWORD(WORD, N) (((WORD) >> ((N)*2)) & 0xFFFFFFFF)
+
+// Assume array contains 4 bytes.
+hword convert_bytes_to_hword(byte *);
+void convert_hword_to_bytes(hword, byte *);
+// Assume array contains 8 bytes.
+word convert_bytes_to_word(byte *);
+void convert_word_to_bytes(word, byte *);
+
+#endif