buffer.h

00001 #ifndef BUFFER_H
00002 #define BUFFER_H
00003 
00004 #include <stdlib.h>
00005 #include <math.h>
00006 #include <oulib.h>
00007 
00012 typedef struct  {
00014   char *buffer;
00016   uint16_t size;
00018   volatile int16_t front;
00020   volatile int16_t back;   
00021 } BUFFER;  
00022 
00023 
00024 extern BUFFER* buffer_create(uint16_t size);
00025 extern void buffer_add(BUFFER* buf, char c);
00026 extern char buffer_remove(BUFFER* buf);
00027 extern int8_t buffer_state(BUFFER* buf);
00028 extern void buffer_reset(BUFFER* buf, uint16_t front, uint16_t back);
00029 extern uint16_t buffer_nbytes(BUFFER* buf);
00030 extern void buffer_flush(BUFFER* buf);
00031 
00045 #define BUFFER_FULL(buf) (buffer_nbytes(buf) == ((buf)->size - 1))
00046 
00060 #define BUFFER_EMPTY(buf) ((buf)->front == (buf)->back)
00061 
00062 
00063 #endif