/*
 * RTC.CPP - Contains Real Time Clock functions.
 * Copyright (C) 1998, 1999 Prashant TR
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * See the file COPYING.TR for more details.
*/

// ID for this file.
#define _RTC_CC_

#include "rtc.h"

int errflag = 0;
FILE *fp;
char cmdline[20];

// Write any string to the file and check for successfulness.
void writestring(const char *string)
{
 if (fprintf(fp, "%s", string) == EOF) {
    errflag = 2;
    checkerrors();
 }
}

int sysinfo()
{
 char output[256];
 unsigned char rtcdata[256];
 int f, flags;
 union REGS regs;
 struct SREGS segs;

 // Create output file.
 if ((fp = fopen("rtc.txt", "w")) == NULL) {
    errflag = 1;
    checkerrors();
 }

 writestring("\nRTC INFORMATION :\n\n");

 // Check if RTC is installed.
 // Get ROM table.
 regs.h.ah = 0xc0;
 int86x(0x15, &regs, &regs, &segs);
 // Check directly if not found (not perfect although).
 if (regs.x.flags & 1) {
    char rtctime;
    outportb(0x70, 0);
    rtctime = inportb(0x71);
    delay(2000);
    outportb(0x70, 0);
    if (inportb(0x71) == rtctime) {
       writestring("\tReal Time Clock not Installed.\n");
       fclose(fp);
       return 0;
    }
 }
 else {
      // Check from ROM table.
      if (peek(segs.es, regs.x.bx) >= 3) {
	 // Entry exists in ROM table.
	 if ((!(peekb(segs.es, regs.x.bx + 4) & 0x20)) && (regs.h.ah)) {
	    writestring("\tReal Time Clock not Installed.\n");
	    fclose(fp);
	    return 0;
	 }
      }
 }
 // RTC is installed.
 writestring("\tReal Time Clock Installed              : Yes\n");

 // Get RTC information.
 for(f = 0; f <= 256; f++)
 {
  outportb(0x70, f);
  rtcdata[f] = inportb(0x71);
 }

 // Check if battery is dead.
 if ((!(rtcdata[0xd] & 0x80)) || (rtcdata[0xe] & 0x80)) {
    writestring("\tPower Condition                        : Battery is dead\n");
    fclose(fp);
    return 0;
 }

 // Write information.
 writestring("\tPower Condition                        : Good\n");
 if (!(rtcdata[0xb] & 4)) {
    // Convert to binary mode if BCD.
    for(f = 0; f <= 9; f++)
    {
	flags = rtcdata[f];
	rtcdata[f] = (flags / 0x10) * 10 + flags % 0x10;
    }
 }

 // Write time.
 sprintf(output, "\tRTC Time                               : %02u:%02u:%02u\n",
		 rtcdata[4],
		 rtcdata[2],
		 rtcdata[0]);
 writestring(output);
 sprintf(output, "\tRTC Alarm time last set                : %02u:%02u:%02u\n",
		 rtcdata[5],
		 rtcdata[3],
		 rtcdata[1]);
 writestring(output);

 // Write date.
 sprintf(output, "\tRTC Date                               : %02u/%02u/%02u\n",
		 rtcdata[7],
		 rtcdata[8],
		 rtcdata[9]);
 writestring(output);

 // Write other information.
 flags = rtcdata[0xa] & 0xf;
 sprintf(output, "\tRTC Rate Selection bits                : %s\n",
		 (!flags) ? "None" :
		 (flags == 3) ? "122 Microseconds" :
		 (flags == 15) ? "500 Milliseconds" :
		 (flags == 6) ? "976.562 Microseconds (Default)" :
		 "(Unknown)");
 writestring(output);
 sprintf(output, "\tDaylight Savings Enabled               : %s\n",
		 (rtcdata[0xb] & 1) ? "Yes" : "No");
 writestring(output);
 sprintf(output, "\tHour Selection                         : %s\n",
		 (rtcdata[0xb] & 2) ? "24-Hour" : "12-Hour");
 writestring(output);
 sprintf(output, "\tData Mode                              : %s\n",
                 (rtcdata[0xb] & 4) ? "Binary" : "BCD");
 writestring(output);
 sprintf(output, "\tSquare Wave Output                     : %s\n",
                 (rtcdata[0xb] & 8) ? "Enabled" : "Disabled");
 writestring(output);
 sprintf(output, "\tRTC Alarm Enabled                      : %s\n",
                 (rtcdata[0xb] & 16) ? "Yes" : "No");
 writestring(output);
 sprintf(output, "\tPeriodic Interrupts                    : %s\n",
                 (rtcdata[0xb] & 64) ? "Enabled" : "Disabled");
 writestring(output);

 fclose(fp);
 return 0;
}

void open_stderr()
{
	fclose(stdout);
	fclose(&_streams[2]);
	if (fopen("nul", "wb") == NULL) exit(0x7f);
	if (fopen("nul", "wb") == NULL) exit(0x7f);
	if ((stderr = fopen("errors.$$$", "ab")) == NULL) exit(0x7f);
}

void get_cmdline()
{
 if ((fp = fopen("cmdline.$$$", "rb")) == NULL) exit (0x7f);

 if (fscanf(fp, "%s", cmdline) != 1) {
		fclose(fp);
		exit (0x7f);
 }

 fclose(fp);
 unlink("cmdline.$$$");

}

#pragma argsused

// The main function.
int main(int argc, char **argv)
{
 open_stderr();
 get_cmdline();

 if (!strcmp(cmdline, "sysinfo")) return (sysinfo());

 return 0;
}