Ring Buffer
Dependents: pseudo_comet GSwifi_sample MelInverter_sample SerialPassthrough_withRB
RingBuffer.cpp
- Committer:
- okini3939
- Date:
- 2010-11-11
- Revision:
- 0:d0e076916a0a
- Child:
- 1:ea0c0a46dbdd
File content as of revision 0:d0e076916a0a:
/* * mbed library for RingBuffer * Copyright (c) 2010 Hiroshi Suga * Released under the MIT License: http://mbed.org/license/mit */ #include "RingBuffer.h" RingBuffer::RingBuffer (int p_size) { size = p_size + 1; buf = new char[size]; addr_w = 0; addr_r = 0; } RingBuffer::~RingBuffer () { delete [] buf; } int RingBuffer::put (char dat) { int next; next = (addr_w + 1) % size; if (next == addr_r) { return -1; } buf[addr_w] = dat; addr_w = next; return dat; } int RingBuffer::put (char *dat, int len) { int next, i; for (i = 0; i < len; i ++) { next = (addr_w + 1) % size; if (next == addr_r) { break; } buf[addr_w] = dat[i]; addr_w = next; } return i; } int RingBuffer::get (char &dat) { if (addr_r == addr_w) { return -1; } dat = buf[addr_r]; addr_r = (addr_r + 1) % size; return 0; } int RingBuffer::get (char *dat, int len) { int i; for (i = 0; i < len; i ++) { if (addr_r == addr_w) { break; } dat[i] = buf[addr_r]; addr_r = (addr_r + 1) % size; } return i; } int RingBuffer::available () { if (addr_w < addr_r) { return addr_r - addr_w - 1; } else { return (size - addr_w) + addr_r - 1; } } int RingBuffer::use () { return size - available() - 1; } void RingBuffer::clear () { addr_w = 0; addr_r = 0; }