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/*
* buffer.c -- generic memory buffer .
*
* Copyright (c) 2001-2011, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include "buffer.h"
static void
buffer_cleanup(void *arg)
{
buffer_type *buffer = (buffer_type *) arg;
assert(!buffer->_fixed);
free(buffer->_data);
}
buffer_type *
buffer_create(region_type *region, size_t capacity)
{
buffer_type *buffer
= (buffer_type *) region_alloc(region, sizeof(buffer_type));
if (!buffer)
return NULL;
buffer->_data = (uint8_t *) xalloc(capacity);
buffer->_position = 0;
buffer->_limit = buffer->_capacity = capacity;
buffer->_fixed = 0;
buffer_invariant(buffer);
region_add_cleanup(region, buffer_cleanup, buffer);
return buffer;
}
void
buffer_create_from(buffer_type *buffer, void *data, size_t size)
{
assert(data);
buffer->_position = 0;
buffer->_limit = buffer->_capacity = size;
buffer->_data = (uint8_t *) data;
buffer->_fixed = 1;
buffer_invariant(buffer);
}
void
buffer_clear(buffer_type *buffer)
{
buffer_invariant(buffer);
buffer->_position = 0;
buffer->_limit = buffer->_capacity;
}
void
buffer_flip(buffer_type *buffer)
{
buffer_invariant(buffer);
buffer->_limit = buffer->_position;
buffer->_position = 0;
}
void
buffer_rewind(buffer_type *buffer)
{
buffer_invariant(buffer);
buffer->_position = 0;
}
void
buffer_set_capacity(buffer_type *buffer, size_t capacity)
{
buffer_invariant(buffer);
assert(buffer->_position <= capacity);
buffer->_data = (uint8_t *) xrealloc(buffer->_data, capacity);
buffer->_limit = buffer->_capacity = capacity;
}
void
buffer_reserve(buffer_type *buffer, size_t amount)
{
buffer_invariant(buffer);
assert(!buffer->_fixed);
if (buffer->_capacity < buffer->_position + amount) {
size_t new_capacity = buffer->_capacity * 3 / 2;
if (new_capacity < buffer->_position + amount) {
new_capacity = buffer->_position + amount;
}
buffer_set_capacity(buffer, new_capacity);
}
buffer->_limit = buffer->_capacity;
}
int
buffer_printf(buffer_type *buffer, const char *format, ...)
{
va_list args;
int written;
size_t remaining;
buffer_invariant(buffer);
assert(buffer->_limit == buffer->_capacity);
remaining = buffer_remaining(buffer);
va_start(args, format);
written = vsnprintf((char *) buffer_current(buffer), remaining,
format, args);
va_end(args);
if (written >= 0 && (size_t) written >= remaining) {
buffer_reserve(buffer, written + 1);
va_start(args, format);
written = vsnprintf((char *) buffer_current(buffer),
buffer_remaining(buffer),
format, args);
va_end(args);
}
buffer->_position += written;
return written;
}
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