#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "calc.yy.h"
#include "calculator.h"

extern void yyparse ();
extern "C" int yywrap () {
  return 1;
}

static char * from_file (const char * filename) {
  struct stat statbuf;
  int r = stat (filename, & statbuf);
  if (r) return nullptr;
  char * buffer = (char*) malloc (statbuf.st_size + 1);
  FILE * in = fopen (filename,"r");
  r = fread (buffer, 1, statbuf.st_size, in);
  if (r != statbuf.st_size) {
    free (buffer);
    fclose (in);
    return nullptr;
  }
  buffer [r] = '\0';
  fclose (in);
  return buffer;
}
void emitData (double * x, double * y, const int len) {
  for (int n=0; n<len; n++) {
    printf("f(%g) = %g\n", x[n], y[n]);
  }
}
/*
static const char * multipliers  [] = {"f","p","n","μ","m","","k","M","G","T","P"};
static void test () {
  const int ofs = 5 * 3;
  for (int n=-15; n<18; n++) {
    div_t dt = div (n + ofs, 3);
    printf("n=%d, q=%d, r=%d (%d)\t%g %s\n", n, dt.quot, dt.rem, dt.quot * 3 + dt.rem - ofs,
           pow(10.0, dt.rem), multipliers[dt.quot]);
  }
}
*/
int main () {
  char * buffer = from_file("test.txt");
  if (!buffer) return 1;
  
  initData();
  YY_BUFFER_STATE result = yy_scan_string(buffer);
  yyparse();
  yy_delete_buffer(result);
  free (buffer);
  finiData();
  
  //test();
  return 0;
}