00001 #ifndef URG_RING_BUFFER_H
00002 #define URG_RING_BUFFER_H
00003 
00017 
00018 typedef struct
00019 {
00020     char *buffer;                 
00021     int buffer_size;              
00022     int first;                    
00023     int last;                     
00024 } ring_buffer_t;
00025 
00026 
00042 extern void ring_initialize(ring_buffer_t *ring,
00043                             char *buffer, const int shift_length);
00044 
00045 
00057 extern void ring_clear(ring_buffer_t *ring);
00058 
00059 
00071 extern int ring_size(const ring_buffer_t *ring);
00072 
00073 
00085 extern int ring_capacity(const ring_buffer_t *ring);
00086 
00087 
00107 extern int ring_write(ring_buffer_t *ring, const char *data, int size);
00108 
00109 
00129 extern int ring_read(ring_buffer_t *ring, char *buffer, int size);
00130 
00131 #endif /* ! RING_BUFFER_H */