diff options
Diffstat (limited to 'shared/backlog.c')
-rw-r--r-- | shared/backlog.c | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/shared/backlog.c b/shared/backlog.c deleted file mode 100644 index 926ccad..0000000 --- a/shared/backlog.c +++ /dev/null @@ -1,47 +0,0 @@ -#include <stdlib.h> - -#include "backlog.h" - -ws_s_backlog_database* g_ws_backlog_database = NULL; - -void ws_backlog_alloc(uint16_t record_amt) { - g_ws_backlog_database = malloc(sizeof(ws_s_backlog_database) + sizeof(ws_s_backlog_record) * record_amt); - g_ws_backlog_database->buffer_size = record_amt; - g_ws_backlog_database->buffer_start = 0; - g_ws_backlog_database->buffer_end = 0; -} - -void ws_backlog_add_record(ws_s_backlog_record record) { - static uint16_t id = 0; - - g_ws_backlog_database->records[g_ws_backlog_database->buffer_end].id = id++; - g_ws_backlog_database->records[g_ws_backlog_database->buffer_end].sens_atm_pressure = record.sens_atm_pressure; - g_ws_backlog_database->records[g_ws_backlog_database->buffer_end].sens_humidity = record.sens_humidity; - g_ws_backlog_database->records[g_ws_backlog_database->buffer_end].sens_temperature = record.sens_temperature; - - // shift buffer start/end - g_ws_backlog_database->buffer_end = (g_ws_backlog_database->buffer_end + 1) % g_ws_backlog_database->buffer_size; - if (g_ws_backlog_database->buffer_end == g_ws_backlog_database->buffer_start) - g_ws_backlog_database->buffer_start = (g_ws_backlog_database->buffer_start + 1) % g_ws_backlog_database->buffer_size; -} - -ws_s_backlog_record* ws_backlog_get_record(uint16_t record_index) { - return &g_ws_backlog_database->records[record_index]; -} - -ws_s_backlog_record* ws_backlog_get_last_record(uint16_t record_offset) { - return ws_backlog_get_record((g_ws_backlog_database->buffer_end - record_offset - 1) % g_ws_backlog_database->buffer_size); -} - -static uint16_t mod(uint16_t a, uint16_t b) { - uint16_t m = a % b; - return m < 0 ? (b < 0) ? m - b : m + b : m; -} - -uint16_t ws_backlog_get_record_count() { - // add buffer_size to the result of the modulo operation if it's result is negative - // (only works when buffer_size is less than 2^15) - // this is a consequence of the way in which c handles negative numbers in modulo operations - int16_t mod = (g_ws_backlog_database->buffer_end - g_ws_backlog_database->buffer_start) % g_ws_backlog_database->buffer_size; - return mod < 0 ? mod + g_ws_backlog_database->buffer_size : mod; -} |