Aryadev Chavali
32dfcc109c
Default C just lets overflows occur for subtraction, so this macro will default to 0 if the subtraction causes an overflow.
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* Copyright (C) 2023 Aryadev Chavali
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* You may distribute and modify this code under the terms of the GPLv2
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* license. You should have received a copy of the GPLv2 license with
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* this file. If not, please write to: aryadev@aryadevchavali.com.
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* Created: 2023-10-15
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* Author: Aryadev Chavali
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* Description: Basic types and routines
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*/
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#ifndef BASE_H
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#define BASE_H
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#include <stdint.h>
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#define ARR_SIZE(xs) (sizeof(xs) / sizeof(xs[0]))
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define MIN(a, b) ((a) > (b) ? (b) : (a))
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// Flags
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#ifndef VERBOSE
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#define VERBOSE 0
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#endif
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typedef uint64_t u64;
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typedef uint32_t u32;
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typedef int32_t i32;
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typedef int64_t i64;
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typedef float f32;
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typedef double f64;
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typedef uint8_t byte;
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typedef u32 hword;
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typedef u64 word;
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typedef union
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{
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byte as_byte;
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hword as_hword;
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word as_word;
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} data_t;
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typedef enum
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{
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DATA_TYPE_NIL = 0,
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DATA_TYPE_BYTE,
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DATA_TYPE_HWORD,
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DATA_TYPE_WORD,
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} data_type_t;
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#define DBYTE(BYTE) ((data_t){.as_byte = (BYTE)})
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#define DHWORD(HWORD) ((data_t){.as_hword = (HWORD)})
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#define DWORD(WORD) ((data_t){.as_word = (WORD)})
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#define WORD_SAFE_SUB(W, SUB) ((W) > (SUB) ? ((W) - (SUB)) : 0)
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#define HWORD_SIZE sizeof(hword)
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#define WORD_SIZE sizeof(word)
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// Macros to extract the nth byte or nth hword from a word
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#define WORD_NTH_BYTE(WORD, N) (((WORD) >> ((N)*8)) & 0xff)
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#define WORD_NTH_HWORD(WORD, N) (((WORD) >> ((N)*2)) & 0xFFFFFFFF)
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// Assume array contains 4 bytes.
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hword convert_bytes_to_hword(byte *);
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void convert_hword_to_bytes(hword, byte *);
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// Assume array contains 8 bytes.
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word convert_bytes_to_word(byte *);
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void convert_word_to_bytes(word, byte *);
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#endif
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