src/main/drivers/buf_writer.h

   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 #pragma once
  19
  20 // Called to flush the buffer.
  21 typedef void (*bufWrite_t)(void *arg, void *data, int count);
  22
  23 typedef struct bufWriter_s {
  24     bufWrite_t writer;
  25     void *arg;
  26     uint8_t capacity;
  27     uint8_t at;
  28     uint8_t data[];
  29 } bufWriter_t;
  30
  31 // Initialise a block of memory as a buffered writer.
  32 //
  33 // b should be sizeof(bufWriter_t) + the number of bytes to buffer.
  34 // total_size should be the total size of b.
  35 //
  36 bufWriter_t *bufWriterInit(uint8_t *b, int total_size, bufWrite_t writer, void *p);
  37 void bufWriterAppend(bufWriter_t *b, uint8_t ch);
  38 void bufWriterFlush(bufWriter_t *b);