/*
 ****************************************************************************
 * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
 ****************************************************************************
 *
 *        File: printf.c
 *      Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
 *     Changes: Grzegorz Milos (gm281@cam.ac.uk)
 *
 *        Date: Aug 2003, Aug 2005
 *
 * Environment: Xen Minimal OS
 * Description: Library functions for printing
 *              (freebsd port, mainly sys/subr_prf.c)
 *
 ****************************************************************************
 *
 *-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
 *
 * $FreeBSD: src/sys/libkern/divdi3.c,v 1.6 1999/08/28 00:46:31 peter Exp $
 */

#include "stdio.h"
#include "unistd.h"

int printf(const char *fmt, ...)
{
    va_list args;
    int i;

    va_start(args, fmt);
    i = vprintf(fmt, args);
    va_end(args);
    return i;
}

int fprintf(FILE *stream, const char *fmt, ...)
{
    va_list args;
    int i;

    va_start(args, fmt);
    i = vfprintf(stream, fmt, args);
    va_end(args);
    return i;
}

int sprintf(char *buf, const char *fmt, ...)
{
    va_list args;
    int i;

    va_start(args, fmt);
    i = vsprintf(buf, fmt, args);
    va_end(args);
    return i;
}

int snprintf(char *buf, size_t size, const char *fmt, ...)
{
    va_list args;
    int i;

    va_start(args, fmt);
    i = vsnprintf(buf, size, fmt, args);
    va_end(args);
    return i;
}

int vprintf(const char *fmt, va_list args)
{
    return vfprintf(stdout, fmt, args);
}

#define __LIBC_PRINTF_BUFSIZE 1024

int vfprintf(FILE *stream, const char *fmt, va_list args)
{
    /* I'm really lazy */
    char buf[__LIBC_PRINTF_BUFSIZE];
    int ret = vsnprintf(buf, __LIBC_PRINTF_BUFSIZE, fmt, args);
    if (ret > 0)
    {
        //   write(stream->fd, buf, ret);

#if 1
        /* slow but simple */
        for (int i = 0; i < ret; i++)
        {
            stream->buffer[stream->offset++] = buf[i];
            if (stream->offset == sizeof(stream->buffer) || buf[i] == '\n')
            {
                // flush
                fflush(stream);
            }
        }
#endif
    }
    return ret;
}

int vsprintf(char *buf, const char *fmt, va_list args)
{
    return vsnprintf(buf, 0xffffffffUL, fmt, args);
}

void __do_fflush(FILE *stream)
{
    if (!stream)
    {
        return;
    }

    if (stream->offset > 0)
    {
        write(stream->fd, stream->buffer, stream->offset);
        stream->offset = 0;
    }
}

int fflush(FILE *stream)
{
    if (!stream)
    {
        __do_fflush(stdin);
        __do_fflush(stdout);
        __do_fflush(stderr);
    }
    else
    {
        __do_fflush(stream);
    }

    return 0;
}