79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
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#ifndef MODIFIERS_H_
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#define MODIFIERS_H_
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#include "defs.h"
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#include <string.h>
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typedef struct {
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size_t byte_length;
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uint8_t *bits;
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} ModifierSet;
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#define EMPTY_MODIFIER_SET ((ModifierSet) {.byte_length = 0, .bits = NULL})
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__attribute__((unused)) inline static ModifierSet
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modifier_set_copy(const ModifierSet old)
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{
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ModifierSet result = old;
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result.bits = malloc(result.byte_length);
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if (!result.bits) {
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result.byte_length = 0;
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return result;
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}
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memcpy(result.bits, old.bits, result.byte_length);
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return result;
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}
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__attribute__((unused)) inline static void
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modifier_set_destruct(ModifierSet * old)
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{
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if (old->bits) {
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free(old->bits);
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}
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old->bits = NULL;
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old->byte_length = 0;
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}
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__attribute__((unused)) inline static bool
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modifier_set_extend(ModifierSet * old, size_t new_byte_length)
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{
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if (new_byte_length > old->byte_length) {
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uint8_t *bits = realloc(old->bits, new_byte_length);
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if (!bits) {
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return false;
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}
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memset(bits + old->byte_length, 0, new_byte_length - old->byte_length);
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old->bits = bits;
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old->byte_length = new_byte_length;
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}
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return true;
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}
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__attribute__((unused)) inline static void
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modifier_set_set_from(ModifierSet * target, const ModifierSet source)
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{
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modifier_set_extend(target, source.byte_length);
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for (size_t i = 0; i < target->byte_length; ++i) {
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target->bits[i] |= source.bits[i];
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}
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}
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__attribute__((unused)) inline static void
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modifier_set_unset_from(ModifierSet * target, const ModifierSet source)
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{
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for (size_t i = 0; i < target->byte_length; ++i) {
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target->bits[i] &= ~source.bits[i];
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}
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}
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__attribute__((unused)) inline static void
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modifier_set_toggle_from(ModifierSet * target, const ModifierSet source)
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{
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modifier_set_extend(target, source.byte_length);
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for (size_t i = 0; i < target->byte_length; ++i) {
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target->bits[i] ^= source.bits[i];
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}
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}
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#endif /* end of include guard: MODIFIERS_H_ */
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