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src/Source/LibJPEG/ckconfig.c  view on Meta::CPAN

 *  some warnings, but you can ignore them.)
 *  When you run the program, it will make a couple more tests that it
 *  can do automatically, and then it will create jconfig.h and print out
 *  any additional suggestions it has.
 ************************************************************************
 */


#ifdef HAVE_PROTOTYPES
int is_char_signed (int arg)
#else
int is_char_signed (arg)
     int arg;
#endif
{
  if (arg == 189) {		/* expected result for unsigned char */
    return 0;			/* type char is unsigned */
  }
  else if (arg != -67) {	/* expected result for signed char */
    printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");
    printf("I fear the JPEG software will not work at all.\n\n");
  }
  return 1;			/* assume char is signed otherwise */
}


#ifdef HAVE_PROTOTYPES
int is_shifting_signed (long arg)
#else
int is_shifting_signed (arg)
     long arg;
#endif
/* See whether right-shift on a long is signed or not. */
{
  long res = arg >> 4;

  if (res == -0x7F7E80CL) {	/* expected result for signed shift */
    return 1;			/* right shift is signed */
  }
  /* see if unsigned-shift hack will fix it. */
  /* we can't just test exact value since it depends on width of long... */
  res |= (~0L) << (32-4);
  if (res == -0x7F7E80CL) {	/* expected result now? */
    return 0;			/* right shift is unsigned */
  }
  printf("Right shift isn't acting as I expect it to.\n");
  printf("I fear the JPEG software will not work at all.\n\n");
  return 0;			/* try it with unsigned anyway */
}


#ifdef HAVE_PROTOTYPES
int main (int argc, char ** argv)
#else
int main (argc, argv)
     int argc;
     char ** argv;
#endif
{
  char signed_char_check = (char) (-67);
  FILE *outfile;

  /* Attempt to write jconfig.h */
  if ((outfile = fopen("jconfig.h", "w")) == NULL) {
    printf("Failed to write jconfig.h\n");
    return 1;
  }

  /* Write out all the info */
  fprintf(outfile, "/* jconfig.h --- generated by ckconfig.c */\n");
  fprintf(outfile, "/* see jconfig.txt for explanations */\n\n");
#ifdef HAVE_PROTOTYPES
  fprintf(outfile, "#define HAVE_PROTOTYPES\n");
#else
  fprintf(outfile, "#undef HAVE_PROTOTYPES\n");
#endif
#ifdef HAVE_UNSIGNED_CHAR
  fprintf(outfile, "#define HAVE_UNSIGNED_CHAR\n");
#else
  fprintf(outfile, "#undef HAVE_UNSIGNED_CHAR\n");
#endif
#ifdef HAVE_UNSIGNED_SHORT
  fprintf(outfile, "#define HAVE_UNSIGNED_SHORT\n");
#else
  fprintf(outfile, "#undef HAVE_UNSIGNED_SHORT\n");
#endif
#ifdef HAVE_VOID
  fprintf(outfile, "/* #define void char */\n");
#else
  fprintf(outfile, "#define void char\n");
#endif
#ifdef HAVE_CONST
  fprintf(outfile, "/* #define const */\n");
#else
  fprintf(outfile, "#define const\n");
#endif
  if (is_char_signed((int) signed_char_check))
    fprintf(outfile, "#undef CHAR_IS_UNSIGNED\n");
  else
    fprintf(outfile, "#define CHAR_IS_UNSIGNED\n");
#ifdef HAVE_STDDEF_H
  fprintf(outfile, "#define HAVE_STDDEF_H\n");
#else
  fprintf(outfile, "#undef HAVE_STDDEF_H\n");
#endif
#ifdef HAVE_STDLIB_H
  fprintf(outfile, "#define HAVE_STDLIB_H\n");
#else
  fprintf(outfile, "#undef HAVE_STDLIB_H\n");
#endif
#ifdef NEED_BSD_STRINGS
  fprintf(outfile, "#define NEED_BSD_STRINGS\n");
#else
  fprintf(outfile, "#undef NEED_BSD_STRINGS\n");
#endif
#ifdef NEED_SYS_TYPES_H
  fprintf(outfile, "#define NEED_SYS_TYPES_H\n");
#else
  fprintf(outfile, "#undef NEED_SYS_TYPES_H\n");
#endif
  fprintf(outfile, "#undef NEED_FAR_POINTERS\n");
#ifdef NEED_SHORT_EXTERNAL_NAMES
  fprintf(outfile, "#define NEED_SHORT_EXTERNAL_NAMES\n");
#else
  fprintf(outfile, "#undef NEED_SHORT_EXTERNAL_NAMES\n");
#endif
#ifdef INCOMPLETE_TYPES_BROKEN
  fprintf(outfile, "#define INCOMPLETE_TYPES_BROKEN\n");
#else
  fprintf(outfile, "#undef INCOMPLETE_TYPES_BROKEN\n");
#endif
  fprintf(outfile, "\n#ifdef JPEG_INTERNALS\n\n");
  if (is_shifting_signed(-0x7F7E80B1L))
    fprintf(outfile, "#undef RIGHT_SHIFT_IS_UNSIGNED\n");
  else
    fprintf(outfile, "#define RIGHT_SHIFT_IS_UNSIGNED\n");
  fprintf(outfile, "\n#endif /* JPEG_INTERNALS */\n");
  fprintf(outfile, "\n#ifdef JPEG_CJPEG_DJPEG\n\n");
  fprintf(outfile, "#define BMP_SUPPORTED		/* BMP image file format */\n");
  fprintf(outfile, "#define GIF_SUPPORTED		/* GIF image file format */\n");
  fprintf(outfile, "#define PPM_SUPPORTED		/* PBMPLUS PPM/PGM image file format */\n");
  fprintf(outfile, "#undef RLE_SUPPORTED		/* Utah RLE image file format */\n");
  fprintf(outfile, "#define TARGA_SUPPORTED		/* Targa image file format */\n\n");
  fprintf(outfile, "#undef TWO_FILE_COMMANDLINE	/* You may need this on non-Unix systems */\n");
  fprintf(outfile, "#undef NEED_SIGNAL_CATCHER	/* Define this if you use jmemname.c */\n");
  fprintf(outfile, "#undef DONT_USE_B_MODE\n");
  fprintf(outfile, "/* #define PROGRESS_REPORT */	/* optional */\n");
  fprintf(outfile, "\n#endif /* JPEG_CJPEG_DJPEG */\n");

  /* Close the jconfig.h file */
  fclose(outfile);

  /* User report */
  printf("Configuration check for Independent JPEG Group's software done.\n");
  printf("\nI have written the jconfig.h file for you.\n\n");
#ifdef HAVE_PROTOTYPES
  printf("You should use makefile.ansi as the starting point for your Makefile.\n");
#else
  printf("You should use makefile.unix as the starting point for your Makefile.\n");
#endif

#ifdef NEED_SPECIAL_INCLUDE
  printf("\nYou'll need to change jconfig.h to include the system include file\n");
  printf("that you found type size_t in, or add a direct definition of type\n");
  printf("size_t if that's what you used.  Just add it to the end.\n");
#endif

  return 0;
}