#include <stdio.h>
#include <string.h>

FILE *fp = 0;
int   fromFile = 0;

FILE * openFile( char * nm ) {
  if( (fp=fopen( nm, "r" )) == 0 ) {
      fprintf( stderr,
      	"Erreur open sur %s, lecture sur stdin !\n");
  }
  else fromFile = 1;
  return fp;
}

myPause( char * prompt ) {
  if( fromFile == 0 ) return;
  fprintf( stderr, "%s ", prompt );
  while( getchar() != '\n' );
}


struct color {
  char * name;
  int    value;
};

struct color colors[] = {
  { "black",  0x000000 },
  { "blue",   0x008888 },
  { "gray",   0x202020 },
  { "green",  0x00A000 },
  { "red",    0xA00000 },
  { "yellow", 0x008080 }
};

#define COLOR_NB  (sizeof(colors)/sizeof(struct color))

int colorValOfS( char *s )
{
  int i=0;
  while( i < COLOR_NB ) {
   if( strcmp( colors[i].name, s ) == 0 ) {
     return colors[i].value;
   }
   i++;
  }
  return -1;
}

char buff[7];

int valOfHexS( char *s ) {
  int x;
  if( s[0] != '#' ) return -1;
  if( strlen(s) == 4 )  // derive #0X0Y0Z from #XYZ
  {
    int i;
    buff[0] = '#';
    for( i=1; i<=3; i++ )
      { buff[2*i] = s[i]; buff[2*i-1] = '0'; }
    sscanf( buff+1, "%x", &x );
  }
  else {  // get the value from this hexadecimal form
    sscanf( s+1, "%x", &x );
  }
  return x;
}

int rgbValOfSFromI( char *s, int i ) {
  int r, g, b;
  sscanf( s+i, "%2d%2d%2d", &r, &g, &b );
  return 65536*r + 256*g +b;
}

int intValOfSFromI( char *s, int i ) {
  int x;
  sscanf( s+i,"%d", &x );
  return x;
}

float floatValOfSFromI( char *s, int i ) {
  float x;
  sscanf( s+i,"%f", &x );
  return x;
}