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btstack_ring_buffer: fix corner cases for empyt/full buffer and data length == 0

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This commit is contained in:
Matthias Ringwald 2017-07-28 10:52:34 +02:00
parent 346b607c48
commit e090bc19b5
1 changed files with 7 additions and 1 deletions
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8
src/btstack_ring_buffer.c
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@ -84,6 +84,9 @@ int btstack_ring_buffer_write(btstack_ring_buffer_t * ring_buffer, uint8_t * dat
return ERROR_CODE_MEMORY_CAPACITY_EXCEEDED;
}
// simplify logic below by asserting data_length > 0
if (data_length == 0) return 0;
// copy first chunk
unsigned int bytes_until_end = ring_buffer->size - ring_buffer->last_written_index;
unsigned int bytes_to_copy = btstack_min(bytes_until_end, data_length);
@ -116,6 +119,9 @@ void btstack_ring_buffer_read(btstack_ring_buffer_t * ring_buffer, uint8_t * dat
data_length = btstack_min(data_length, btstack_ring_buffer_bytes_available(ring_buffer));
*number_of_bytes_read = data_length;
// simplify logic below by asserting data_length > 0
if (data_length == 0) return;
// copy first chunk
unsigned int bytes_until_end = ring_buffer->size - ring_buffer->last_read_index;
unsigned int bytes_to_copy = btstack_min(bytes_until_end, data_length);
@ -135,7 +141,7 @@ void btstack_ring_buffer_read(btstack_ring_buffer_t * ring_buffer, uint8_t * dat
ring_buffer->last_read_index += data_length;
}
// clear full flag
// clear full flag
ring_buffer->full = 0;
}