/* cs-opt2.c - Don Yang (uguu.org)
   Compress whitespaces and remove comments.

   Uses alternative DFA from cs-opt1*, more states but simpler code.

   04/29/05
                                                                           */

#include<stdio.h>


static void Filter(FILE *infile, FILE *outfile)
{
               /* 0 123 456 70 1 */
   char *input = "\n  \"/'\\*\r\t";
   char *dfa =
      "+++3@K+ 11111111IIIIIIII////h//8       pXx)1\0I))111)11\t1"
      "8888888PX@@@@@@@IIIII)\21I8888X88PXX-5\30M--\253\253\253\253@"
      "\253\253 Xhhhhhhh    x  pXx\251\261`\311\251\251";
   char *state;
   int i, j, k;

   for(state = dfa + 40;
       (i = fgetc(infile)) != EOF;
       state = dfa + (k & 0x78))
   {
      for(j = 0; input[j] != '\0' && (int)input[j] != i; j++);
      k = (int)*(state + (j & 7));
      if( (k & 0x80) != 0 )   (void)fputc(' ', outfile);
      if( (k & 4) != 0 )      (void)fputc('\n', outfile);
      if( (k & 2) != 0 )      (void)fputc('/', outfile);
      if( (k & 1) != 0 )      (void)fputc(i, outfile);
   }
   (void)fputc('\n', outfile);
}

int main(int argc, char **argv)
{
   FILE *infile, *outfile;

   infile = stdin;
   outfile = stdout;
   if( argc > 1 )
   {
      if( (infile = fopen(argv[1], "rb")) == NULL )
         return printf("Can not open %s\n", argv[1]);
      if( argc > 2 )
      {
         if( (outfile = fopen(argv[2], "wb+")) == NULL )
         {
            (void)fclose(infile);
            return printf("Can not write to %s\n", argv[2]);
         }
      }
   }
   Filter(infile, outfile);
   (void)fclose(infile);
   (void)fclose(outfile);
   return 0;
}