Added line follower boilerplate

line-follower/leelib.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void readEdge (int *i, int *j)
+/* Scans input to read a blocked edge.
+   Returns the indices i and j in m[13][13] of an edge.
+   Call this function with pointers to the variables 
+   that should receive the values, e.g.
+       readEdge (&x, &y);
+*/
+{
+   int cx, cy;
+   char d;
+   scanf ("%d %d %c", &cy, &cx, &d);
+   if (d == 's') { 
+      *i = 2 + cy * 2 + 1; 
+      *j = 2 + cx * 2; 
+   }
+   else if (d == 'e') { 
+      *i = 2 + cy * 2; 
+      *j = 2 + cx * 2 + 1; 
+   }
+   else { 
+      fprintf (stderr, "error on direction: %c\n", d); 
+      exit (1); 
+   }  
+}
+
+void readStation (int *i, int *j)
+/* Scans input to read a station.
+   Returns the indices i and j in m[13][13] of a station.
+ */
+{
+   int s;
+   scanf ("%d", &s);
+   switch (s) {
+      case 1: *i = 12, *j = 4; break;
+      case 2: *i = 12, *j = 6; break;
+      case 3: *i = 12, *j = 8; break;
+      case 4: *i = 8, *j = 12; break;
+      case 5: *i = 6, *j = 12; break;
+      case 6: *i = 4, *j = 12; break;
+      case 7: *i = 0, *j = 8; break;
+      case 8: *i = 0, *j = 6; break;
+      case 9: *i = 0, *j = 4; break;
+      case 10: *i = 4, *j = 0; break;
+      case 11: *i = 6, *j = 0; break;
+      case 12: *i = 8, *j = 0; break;
+      default: fprintf (stderr, "Illegal station\n"); exit (-1);
+   }
+}
+
+void printCrossingName (int i, int j)
+/* Print the name of the crossing with indices i and j in m[13][13]/ */
+{
+   if ((i-2)%2 == 0 && (j-2)%2 == 0)
+      printf ("c%d%d ",  (i-2)/2, (j-2)/2);
+}
+
+void printMatrix (int m[][13])
+/* Print the elements of the matrix m[13][13]. */
+{
+   int i, j;
+
+   for (i = 0; i < 13; i++) {
+      for (j = 0; j < 13; j++) {
+         printf ("%2d ", m[i][j]);
+      }
+      printf ("\n");
+   }
+}

line-follower/leelib.h

@@ -0,0 +1,19 @@
+void readEdge (int *i, int *j);
+/* Scans input to read a blocked edge.
+   Returns the indices i and j in m[13][13] of an edge.
+   Call this function with pointers to the variables 
+   that should receive the values, e.g.
+       readEdge (&x, &y);
+*/
+
+void readStation (int *i, int *j);
+/* Scans input to read a station.
+   Returns the indices i and j in m[13][13] of a station.
+ */
+
+void printCrossingName (int i, int j);
+/* Print the name of the crossing with indices i and j in m[13][13]/ */
+
+void printMatrix (int m[][13]);
+/* Print the elements of the matrix m[13][13]. */
+