buffer.h

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/* -*- mode: c; c-basic-offset: 4; -*- */
/* Created by Eric Crosson 2015-03-04 */
/* Revision history: Look in Git FGT */
#ifndef __BUFFER__
#define __BUFFER__

#define BUFFER_MAX_LENGTH                      32
#define BUFFER_DEFAULT_DECREMENT_AMOUNT         1

#define buffer_init(buf)            \
    buffer_len(buf) = 0;

#define buffer_add(buf, elt)                \
    do {                        \
        if(buffer_len(buf) + 1 <= BUFFER_MAX_LENGTH) {  \
        buf[buffer_len(buf)] = elt;         \
        ++buffer_len(buf);                          \
        }                                               \
    } while (false)


#define buffer_dec(buf)             \
    buffer_dec_(buf, BUFFER_DEFAULT_DECREMENT_AMOUNT)

#define buffer_dec_(buf, amount)                \
    do {                            \
        if(buffer_len(buf) - amount >= 0) {         \
        buffer_len(buf) = buffer_len(buf) - amount;     \
        }                           \
    } while (false)

#define buffer_last(buf)            \
    buf[buffer_len(buf)-1]

#define buffer_full(buf)            \
    (buf##_SIZE == BUFFER_MAX_LENGTH-1)

#define buffer_empty(buf)           \
    (buf##_SIZE == 0)

#define buffer_clear(buf)           \
    buffer_len(buf) = 0

#define buffer_null_terminate(buf)      \
    buf[buffer_len(buf)] = 0

#define buffer_len(buf)             \
    buf##_SIZE

#endif

/* End Doxygen group
 * @}
 */