src/lib/databuf.cpp

//
// AutoCoast: Automatic Coastline scenery generator for Flight Simulator
//
// Copyright (c) 2004, Takuya Murakami. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// databuf.cc : data buffer

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#include "databuf.hpp"

#define BUF_UNIT        256

DataBuf::DataBuf()
{
        sz = 0;

        buf = (char *)malloc(BUF_UNIT);
        bufsz = BUF_UNIT;
}

DataBuf::~DataBuf()
{
        free(buf);
}

void DataBuf::write(void *data, int len)
{
        int incr = sz + len - bufsz;
        if (incr > 0) {
                incr = incr - (incr % BUF_UNIT) + BUF_UNIT;
                bufsz += incr;
                buf = (char *)realloc(buf, bufsz);
        }

        memcpy(buf + sz, data, len);
        sz += len;
}


void DataBuf::sprintf(const char *fmt, ...)
{
        va_list ap;
        char buf[10240];

        va_start(ap, fmt);
        int len = vsprintf(buf, fmt, ap);
        va_end(ap);
        if (len <= 0) {
                /* oops!!! */
                exit(1);        /* ### */
        }
        write(buf, len);
}