Add error checking and better reporting

puzz.c

@@ -38,17 +38,35 @@ void gen(void)
 	}
 }
 
-void print(void)
+void print(puzz_t puzz)
 {
-	puts("Solution:");
 	for (int y = 0; y < HEIGHT; ++y) {
-		for (int x = 0; x < WIDTH; ++x)
-			putchar(soln[x][y] == MINE ? 'x' : '0' + soln[x][y]);
+		for (int x = 0; x < WIDTH; ++x) {
+			char c;
+			switch (puzz[x][y]) {
+			case MINE:
+				c = 'x';
+				break;
+			case UNKNOWN:
+				c = '.';
+				break;
+			default:
+				c = '0' + puzz[x][y];
+				break;
+			}
+			putchar(c);
+		}
 		putchar('\n');
 	}
 	putchar('\n');
 }
 
+void printsoln(void)
+{
+	puts("Solution:");
+	print(soln);
+}
+
 static void scan_copy(int x, int y, puzz_t out)
 {
 	assert(x >= 0 && x < WIDTH);
@@ -84,6 +102,17 @@ status_t probe(int x, int y, puzz_t out)
 	return OK;
 }
 
+status_t check(puzz_t puzz)
+{
+	for (int y = 0; y < HEIGHT; ++y) {
+		for (int x = 0; x < WIDTH; ++x) {
+			if (puzz[x][y] != UNKNOWN && puzz[x][y] != soln[x][y])
+				return INCORRECT;
+		}
+	}
+	return OK;
+}
+
 int countadj(puzz_t field, int x, int y, uint8_t val)
 {
 	int n = 0;