/*
 * Copyright (c) 2007, Cameron Rich
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * * 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.
 * * Neither the name of the axTLS project 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 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 COPYRIGHT OWNER 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.
 */

/**
 * @file os_port.c
 *
 * OS specific functions.
 */
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include "os_port.h"
#include <stdio.h>
#include "sockets.h"

static int memory_buf[400];
static char enable = 1;
static int nb_entries = 0;
static int nb_alloc = 0;

void disable_memory_buf(void)
{
    enable = 0;
}
void enable_memory_buf(void)
{
    enable = 1;
}
void init_memory_buf(void)
{
    for(int i = 0; i < 400; i += 2)
    {
        memory_buf[i] = -1;
        memory_buf[i+1] = 0;
    }
}   
void print_buf_stats(void)
{
    if(enable)
    {
        int used = 0;
        for(int i = 1; i < 400; i += 2)
            used += memory_buf[i];
        printf("%d\n", used);
    }
}

void print_all_buf_stats(void)
{       
    int used = 0;
    for(int i = 1; i < 400; i += 2)
        used += memory_buf[i];
    printf("used: %d bytes\n", used);
    
    for(int i = 0; i < 400; i += 2)
        if(memory_buf[i] != -1)
            printf("ptr:%X, size:%d\n", memory_buf[i], memory_buf[i+1]);
}

static void add_entry(void *x, size_t s, const char* f, const int l)
{
    nb_entries++;
    for(int i = 0; i < 400; i += 2)
    {
        if(memory_buf[i] == -1)
        {
            if(enable)
                printf("new ptr:%X, size:%d at %s:%d\n", x, s, f, l); 
            memory_buf[i] = (int)(x);
            memory_buf[i+1] = s;
            return;
        }
    }
    if(enable)
        printf("No space left in buffer\n"); 
}

static void remove_entry(void *x, const char* f, const int l)
{
    nb_entries--;
    for(int i = 0; i < 400; i += 2)
    {
        if(memory_buf[i] == (int)(x))
        {
            if(enable)
                printf("free ptr:%X, size:%d at %s:%d\n", memory_buf[i], memory_buf[i+1], f, l); 
            memory_buf[i] = -1;
            memory_buf[i+1] = 0;
            return;
        }
    }
    if(enable)
        printf("not found\n");
}

#ifdef MBED
/**
 * gettimeofday() not in mbed 
 */
EXP_FUNC void STDCALL gettimeofday(struct timeval* t, void* timezone)
{       
    t->tv_sec = time(NULL);
    t->tv_usec = 0;                         /* 1sec precision only */ 
}

#endif

#ifdef WIN32
/**
 * gettimeofday() not in Win32 
 */
EXP_FUNC void STDCALL gettimeofday(struct timeval* t, void* timezone)
{       
#if defined(_WIN32_WCE)
    t->tv_sec = time(NULL);
    t->tv_usec = 0;                         /* 1sec precision only */ 
#else
    struct _timeb timebuffer;
    _ftime(&timebuffer);
    t->tv_sec = (long)timebuffer.time;
    t->tv_usec = 1000 * timebuffer.millitm; /* 1ms precision */
#endif
}


/**
 * strcasecmp() not in Win32
 */
EXP_FUNC int STDCALL strcasecmp(const char *s1, const char *s2)
{
    while (tolower(*s1) == tolower(*s2++))
    {
        if (*s1++ == '\0')
        {
            return 0;
        }
    }

    return *(unsigned char *)s1 - *(unsigned char *)(s2 - 1);
}


EXP_FUNC int STDCALL getdomainname(char *buf, int buf_size)
{
    HKEY hKey;
    unsigned long datatype;
    unsigned long bufferlength = buf_size;

    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
            TEXT("SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"),
                        0, KEY_QUERY_VALUE, &hKey) != ERROR_SUCCESS)
        return -1;

    RegQueryValueEx(hKey, "Domain", NULL, &datatype, buf, &bufferlength);
    RegCloseKey(hKey);
    return 0; 
}
#endif

#undef malloc
#undef realloc
#undef calloc
#undef free

static const char * out_of_mem_str = "out of memory";
static const char * file_open_str = "Could not open file \"%s\"";

/* 
 * Some functions that call display some error trace and then call abort().
 * This just makes life much easier on embedded systems, since we're 
 * suffering major trauma...
 */
EXP_FUNC void * STDCALL ax_malloc(size_t s, const char* f, const int l)
{
    if(enable)  
        printf("malloc\t");

    void *x;

    if ((x = malloc(s)) == NULL)
        exit_now(out_of_mem_str);
    add_entry(x,s, f, l);
    print_buf_stats();

    return x;
}

EXP_FUNC void * STDCALL ax_realloc(void *y, size_t s, const char* f, const int l)
{
    if(enable)  
        printf("realloc\t");

    void *x;

    if ((x = realloc(y, s)) == NULL)
        exit_now(out_of_mem_str);
    remove_entry(y, f, l);
    add_entry(x,s, f, l);
    print_buf_stats();
    return x;
}

EXP_FUNC void * STDCALL ax_calloc(size_t n, size_t s, const char* f, const int l)
{
    if(enable)  
        printf("calloc\t");
    void *x;
  
    if ((x = calloc(n, s)) == NULL) {
        exit_now(out_of_mem_str);
    }

    add_entry(x,n*s, f, l);
    print_buf_stats();
    return x;
}

EXP_FUNC void STDCALL ax_free(void *y, const char* f, const int l)
{
    if(enable)  
        printf("free\t");
        
    remove_entry(y, f, l);
    print_buf_stats();
    free(y);
}
/*
EXP_FUNC int STDCALL ax_open(const char *pathname, int flags)
{
    int x;

    if ((x = open(pathname, flags)) < 0)
        exit_now(file_open_str, pathname);

    return x;
}
*/

/**
 * This is a call which will deliberately exit an application, but will
 * display some information before dying.
 */
void exit_now(const char *format, ...)
{
    va_list argp;

    va_start(argp, format);
    vfprintf(stderr, format, argp);
    va_end(argp);
    abort();
}