src/main/drivers/buf_writer.c

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * Cleanflight is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdint.h>
  19
  20 #include "buf_writer.h"
  21
  22 bufWriter_t *bufWriterInit(uint8_t *b, int total_size, bufWrite_t writer, void *arg)
  23 {
  24     bufWriter_t *buf = (bufWriter_t *)b;
  25     buf->writer = writer;
  26     buf->arg = arg;
  27     buf->at = 0;
  28     buf->capacity = total_size - sizeof(*buf);
  29
  30     return buf;
  31 }
  32
  33 void bufWriterAppend(bufWriter_t *b, uint8_t ch)
  34 {
  35     b->data[b->at++] = ch;
  36     if (b->at >= b->capacity) {
  37         bufWriterFlush(b);
  38     }
  39 }
  40
  41 void bufWriterFlush(bufWriter_t *b)
  42 {
  43     if (b->at != 0) {
  44         b->writer(b->arg, b->data, b->at);
  45         b->at = 0;
  46     }
  47 }