src/main/drivers/buf_writer.h

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #pragma once
  22
  23 // Called to flush the buffer.
  24 typedef void (*bufWrite_t)(void *arg, void *data, int count);
  25
  26 typedef struct bufWriter_s {
  27     bufWrite_t writer;
  28     void *arg;
  29     uint8_t capacity;
  30     uint8_t at;
  31     uint8_t data[];
  32 } bufWriter_t;
  33
  34 // Initialise a block of memory as a buffered writer.
  35 //
  36 // b should be sizeof(bufWriter_t) + the number of bytes to buffer.
  37 // total_size should be the total size of b.
  38 //
  39 bufWriter_t *bufWriterInit(uint8_t *b, int total_size, bufWrite_t writer, void *p);
  40 void bufWriterAppend(bufWriter_t *b, uint8_t ch);
  41 void bufWriterFlush(bufWriter_t *b);