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Added macro to do safe subtractions on a word

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Default C just lets overflows occur for subtraction, so this macro
will default to 0 if the subtraction causes an overflow.
This commit is contained in:
Aryadev Chavali
2023-10-28 18:16:50 +01:00
parent fc81cda96b
commit 32dfcc109c
1 changed files with 4 additions and 3 deletions
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7
lib/base.h
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@@ -49,9 +49,10 @@ typedef enum
DATA_TYPE_WORD, DATA_TYPE_WORD,
} data_type_t; } data_type_t;
#define DBYTE(BYTE) ((data_t){.as_byte = (BYTE)}) #define DBYTE(BYTE) ((data_t){.as_byte = (BYTE)})
#define DHWORD(HWORD) ((data_t){.as_hword = (HWORD)}) #define DHWORD(HWORD) ((data_t){.as_hword = (HWORD)})
#define DWORD(WORD) ((data_t){.as_word = (WORD)}) #define DWORD(WORD) ((data_t){.as_word = (WORD)})
#define WORD_SAFE_SUB(W, SUB) ((W) > (SUB) ? ((W) - (SUB)) : 0)
#define HWORD_SIZE sizeof(hword) #define HWORD_SIZE sizeof(hword)
#define WORD_SIZE sizeof(word) #define WORD_SIZE sizeof(word)