128 lines
2.3 KiB
C
128 lines
2.3 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#define SIZE 24
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typedef int BOOL;
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#define TRUE 1
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#define FALSE 0
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typedef struct
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{
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int head;
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int tail;
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int size;
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int* buffer;
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} RingBufferState;
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BOOL init_ring_buffer(int size, RingBufferState* state)
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{
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if (state == NULL)
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return FALSE;
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int* buffer = malloc(size * sizeof(int));
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if (buffer == NULL)
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return FALSE;
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state->buffer = buffer;
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state->head = 0;
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state->tail = 0;
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state->size = size;
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return TRUE;
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}
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BOOL free_ring_buffer(RingBufferState* state)
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{
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if (state == NULL)
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return FALSE;
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free(state->buffer);
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state->buffer = NULL;
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state->size = 0;
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state->tail = 0;
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state->head = 0;
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return TRUE;
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}
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BOOL push_to_ring_buffer(int value, RingBufferState* state)
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{
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if (state == NULL)
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return FALSE;
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state->buffer[state->head] = value;
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++state->head;
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if (state->head >= state->size)
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state->head = 0;
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if (state->head == state->tail)
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++state->tail;
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return TRUE;
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}
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BOOL pop_from_ring_buffer(int* value, RingBufferState* state)
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{
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if (state == NULL || state->head == state->tail)
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return FALSE;
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--state->head;
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if (state->head < 0)
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state->head = state->size - 1;
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*value = state->buffer[state->head];
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return TRUE;
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}
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BOOL print_ring_buffer(RingBufferState* state)
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{
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if (state == NULL)
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return FALSE;
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printf("h: %d; t: %d; s: %d\n", state->head, state->tail, state->size);
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for (int i = 0; i < state->size; ++i)
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{
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if (i == state->tail)
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printf("|");
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printf("%d ", state->buffer[i]);
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if (i == state->head)
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printf("^");
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}
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printf("\n");
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return TRUE;
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}
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int main()
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{
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RingBufferState state;
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init_ring_buffer(SIZE, &state);
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for (int i = 0; i < SIZE; ++i)
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push_to_ring_buffer(i, &state);
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print_ring_buffer(&state);
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printf("----\n");
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push_to_ring_buffer(999, &state);
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push_to_ring_buffer(999, &state);
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print_ring_buffer(&state);
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int value = 0;
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pop_from_ring_buffer(&value, &state);
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printf("---\n");
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printf("g: %d\n", value);
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print_ring_buffer(&state);
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printf("---\n");
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push_to_ring_buffer(6969, &state);
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print_ring_buffer(&state);
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pop_from_ring_buffer(&value, &state);
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pop_from_ring_buffer(&value, &state);
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pop_from_ring_buffer(&value, &state);
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pop_from_ring_buffer(&value, &state);
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pop_from_ring_buffer(&value, &state);
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print_ring_buffer(&state);
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push_to_ring_buffer(6969, &state);
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push_to_ring_buffer(6969, &state);
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print_ring_buffer(&state);
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}
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