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/**
* \file buffers.c
* \brief Shared working buffer system.
* \author Copyright (c) 2007-2007 Jason Perkins and the Premake project
*
* \note I need to do a lot of string building operations in Premake. Rather than
* constantly creating, resizing, and releasing (and forgetting to release)
* dynamic string buffers, I use this shared buffer pool instead. Each request
* to buffer_next() returns the next buffer in the list. Pointers to the buffers
* can be safely passed around, and I don't need to remember to release anything
* when I'm done. The buffers should only be used for transient values, obviously.
* If you need to keep a value around for any length of time copy it to a string.
*
* \note The size and number of the buffers is arbitrary; I just picked some numbers
* that seemed big enough.
*/
#include <stdlib.h>
#include "premake.h"
#include "base/buffers.h"
/** The size of an individual buffer, in bytes. */
const int BUFFER_SIZE = 0x4000;
/** The number of buffers stored in the pool */
static const int NUM_BUFFERS = 128;
/** The pool of buffers */
static char** buffers = NULL;
/** The index of the next available buffer */
static int next = 0;
/**
* Clean up after the buffer system. Called by atexit().
*/
static void buffers_destroy(void)
{
if (buffers != NULL)
{
int i;
for (i = 0; i < NUM_BUFFERS; ++i)
{
free(buffers[i]);
}
free(buffers);
}
}
/**
* Initialize the buffer system.
*/
static void buffers_create(void)
{
int i;
buffers = (char**)malloc(sizeof(char*) * NUM_BUFFERS);
for (i = 0; i < NUM_BUFFERS; ++i)
{
buffers[i] = (char*)malloc(BUFFER_SIZE);
}
next = 0;
atexit(buffers_destroy);
}
/**
* Get a clean buffer.
* \returns An empty buffer.
*/
char * buffers_next()
{
/* if this is the first call, initialize the buffer system */
if (buffers == NULL)
buffers_create();
next++;
if (next == NUM_BUFFERS)
next = 0;
/* initialize new buffers to empty string */
buffers[next][0] = '\0';
return buffers[next];
}
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