configure.c

LINUX1.0内核源代码,学习LINUX编程的一定要看。

/*
 * sound/configure.c	- Configuration program for the Linux Sound Driver
 * 
 * Copyright by Hannu Savolainen 1993
 * 
 * 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 AUTHOR 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 AUTHOR 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.
 * 
 */

#include <stdio.h>

#define B(x)	(1 << (x))

/*
 * Option numbers
 */

#define OPT_PAS		0
#define OPT_SB		1
#define OPT_ADLIB	2
#define OPT_LAST_MUTUAL	2

#define OPT_GUS		3
#define OPT_MPU401	4

#define OPT_HIGHLEVEL   5
#define OPT_SBPRO	5
#define OPT_SB16	6
#define OPT_AUDIO	7
#define OPT_MIDI_AUTO	8
#define OPT_MIDI	9
#define OPT_YM3812_AUTO	10	/* Select this automaticly if user selects
				 * MIDI or AdLib driver */
#define OPT_YM3812	11	/* Select this if the previous one was not
				 * selected */
#define OPT_SEQUENCER	12
#define OPT_CHIP_MIDI   13	/* New support added at UW - Milwauklee UW -
				 * Milwauklee */
#define OPT_LAST	12

#define ANY_DEVS (B(OPT_AUDIO)|B(OPT_MIDI)|B(OPT_SEQUENCER)|B(OPT_GUS)|B(OPT_MPU401))

typedef struct
  {
    unsigned long   conditions;
    unsigned long   exclusive_options;
    char            macro[20];
    int             verify;
    int             alias;
    int		    default_answ;
  }

hw_entry;


/*
 * The rule table for the driver options. The first field defines a set of
 * options which must be selected before this entry can be selected. The
 * second field is a set of options which are not allowed with this one. If
 * the fourth field is zero, the option is selected without asking
 * confirmation from the user.
 * 
 * With this version of the rule table it is possible to select just one type of
 * hardware.
 * 
 * NOTE!	Keep the following table and the questions array in sync with the
 * option numbering!
 */

hw_entry        hw_table[] =
{
/* 0 */
  {0, 0, "PAS", 1, 0, 0},
  {0, 0, "SB", 1, 0, 0},
  {0, B (OPT_PAS) | B (OPT_SB), "ADLIB", 1, 0, 0},

/* 3 */
  {0, 0, "GUS", 1, 0, 0},
  {0, 0, "MPU401", 1, 0, 0},
  {B (OPT_SB), B (OPT_PAS), "SBPRO", 1, 0, 1},
  {B (OPT_SB) | B (OPT_SBPRO), B (OPT_PAS), "SB16", 1, 0, 1},
  {B (OPT_SB) | B (OPT_PAS) | B (OPT_GUS), 0, "AUDIO", 1, 0, 1},
  {B (OPT_MPU401), 0, "MIDI_AUTO", 0, OPT_MIDI, 0},
  {B (OPT_SB) | B (OPT_PAS) | B (OPT_MPU401) | B (OPT_GUS), 0, "MIDI", 1, 0, 1},
  {B (OPT_ADLIB), 0, "YM3812_AUTO", 0, OPT_YM3812, 0},
  {B (OPT_SB) | B (OPT_PAS) | B (OPT_ADLIB), B (OPT_YM3812_AUTO), "YM3812", 1, 0, 1},
/* 10 */
  {B (OPT_MIDI) | B (OPT_YM3812) | B (OPT_YM3812_AUTO) | B (OPT_GUS), 0, "SEQUENCER", 0, 0, 1},
  {0, 0, "CHIP_MIDI", 1, 0, 0}
};

char           *questions[] =
{
  "ProAudioSpectrum 16 support",
  "SoundBlaster support",
  "AdLib support",
  "Gravis Ultrasound support",
  "MPU-401 support (NOT for SB16)",

  "SoundBlaster Pro support",
  "SoundBlaster 16 support",
  "digitized voice support",
  "This should not be asked",
  "MIDI interface support",
  "This should not be asked",
  "FM synthesizer (YM3812/OPL-3) support",
  "/dev/sequencer support",
  "MIDI on CHIP support"
};

unsigned long   selected_options = 0;
int sb_dma = 0;

int
can_select_option (int nr)
{
  switch (nr)
    {
    case 0:
      fprintf (stderr, "The SoundBlaster, AdLib and ProAudioSpectrum\n"
	       "cards cannot be installed at the same time\n");
      fprintf (stderr, "\nSelect at most one of them:\n");
      fprintf (stderr, "	- ProAudioSpectrum 16\n");
      fprintf (stderr, "	- SoundBlaster / SB Pro\n");
      fprintf (stderr, "          (Could be selected with PAS16 also\n"
	       "	  since there is a SB emulation on it)\n");
      fprintf (stderr, "	- AdLib\n");
      fprintf (stderr, "\nDon't enable SoundBlaster if you have GUS at 0x220!\n\n");
      break;

    case OPT_LAST_MUTUAL + 1:
      fprintf (stderr, "\nThe following cards should work with any other cards.\n"
	       "CAUTION! Don't enable MPU-401 if you don't have it.\n");
      break;

    case OPT_HIGHLEVEL:
      fprintf (stderr, "\nSelect one or more of the following options\n");
      break;


    }

  if (hw_table[nr].conditions)
    if (!(hw_table[nr].conditions & selected_options))
      return 0;

  if (hw_table[nr].exclusive_options)
    if (hw_table[nr].exclusive_options & selected_options)
      return 0;

  return 1;
}

int
think_positively (int def_answ)
{
  char            answ[512];
  int             len;

  if ((len = read (0, &answ, sizeof (answ))) < 1)
    {
      fprintf (stderr, "\n\nERROR! Cannot read stdin\n");

      perror ("stdin");
      printf ("#undef CONFIGURE_SOUNDCARD\n");
      printf ("#undef KERNEL_SOUNDCARD\n");
      exit (-1);
    }

  if (len < 2)			/* There is an additional LF at the end */
    return def_answ;

  answ[len - 1] = 0;

  if (!strcmp (answ, "y") || !strcmp (answ, "Y"))
    return 1;

  return 0;
}

int
ask_value (char *format, int default_answer)
{
  char            answ[512];
  int             len, num;

play_it_again_Sam:

  if ((len = read (0, &answ, sizeof (answ))) < 1)
    {
      fprintf (stderr, "\n\nERROR! Cannot read stdin\n");

      perror ("stdin");
      printf ("#undef CONFIGURE_SOUNDCARD\n");
      printf ("#undef KERNEL_SOUNDCARD\n");
      exit (-1);
    }

  if (len < 2)			/* There is an additional LF at the end */
    return default_answer;

  answ[len - 1] = 0;

  if (sscanf (answ, format, &num) != 1)
    {
      fprintf (stderr, "Illegal format. Try again: ");
      goto play_it_again_Sam;
    }

  return num;
}

int
main (int argc, char *argv[])
{
  int             i, num, def_size, full_driver = 1;
  char            answ[10];

  printf ("/*\tGenerated by configure. Don't edit!!!!\t*/\n\n");

  fprintf (stderr, "\nConfiguring the sound support\n\n");

  fprintf (stderr, "Do you want to include full version of the sound driver (n/y) ? ");

  if (think_positively (0))
    {
      selected_options = 0xffffffff & ~B (OPT_MPU401);
      fprintf (stderr, "Note! MPU-401 driver was not enabled\n");
      full_driver = 1;
    }
  else
    {
      fprintf (stderr, "Do you want to DISABLE the Sound Driver (n/y) ?");
      if (think_positively (0))
	{
	  printf ("#undef CONFIGURE_SOUNDCARD\n");
	  printf ("#undef KERNEL_SOUNDCARD\n");
	  exit (0);
	}
      /* Partial driver */

      full_driver = 0;

      for (i = 0; i <= OPT_LAST; i++)
	if (can_select_option (i))
	  {
	    if (!(selected_options & B (i)))	/* Not selected yet */
	      if (!hw_table[i].verify)
		{
		  if (hw_table[i].alias)
		    selected_options |= B (hw_table[i].alias);
		  else
		    selected_options |= B (i);
		}
	      else
		{
		  int def_answ = hw_table[i].default_answ;