Add file loading

1 files changed, 55 insertions, 0 deletions

diff --git a/load.c b/load.c
new file mode 100644
index 0000000..bc2b875
--- /dev/null
+++ b/load.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+#include "cell.h"
+
+int load(FILE *f, struct cell (*b)[9][9])
+{
+	int x = 0;
+	int y = 0;
+	char c = '\0';
+
+	while (y < 9) {
+		c = fgetc(f);
+
+		switch(c) {
+			case ' ':
+			case '\n':
+			case '\t':
+			case '|':
+				/* skip whitespace, | */
+				continue;
+
+			case '_':
+			case '?':
+				/* blank = same as 0 */
+				c = '0';
+				/* fallthrough */
+			case '0':
+			case '1':
+			case '2':
+			case '3':
+			case '4':
+			case '5':
+			case '6':
+			case '7':
+			case '8':
+			case '9':
+				(*b)[x][y].val = c - '0';
+				break;
+
+			case EOF:
+				printf("Unexpected EOF when filling (%d,%d)\n", x, y);
+				return -1;
+			default:
+				printf("Unexpected '%c' when filling (%d,%d)\n", c, x, y);
+				return -1;
+		}
+
+		/* move to next position in board */
+		if (++x == 9) {
+			x = 0;
+			y++;
+		}
+	}
+	return 0;
+}