sudoku: add grid parsing functions

meson.build

@@ -10,6 +10,7 @@ project(
 
 sources = [
   'src/main.c',
+  'src/sudoku.c',
 ]
 
 executable(

src/sudoku.c

@@ -0,0 +1,37 @@
+#include "sudoku.h"
+
+#include <stdio.h>
+
+#define INPUT_PATTERN "%1d %1d %1d %1d %1d %1d %1d %1d %1d\n"
+
+bool parse_grid_file(struct sudoku *grid, FILE *input) {
+    if (!input || !grid)
+        return false;
+
+    for (size_t i = 0; i < 9; ++i) {
+        int *line = grid->grid[i];
+
+        if (fscanf(input, INPUT_PATTERN, &line[0], &line[1], &line[2], &line[3],
+                   &line[4], &line[5], &line[6], &line[7], &line[8])
+            < 9)
+            return false;
+    }
+
+    return true;
+}
+
+bool parse_grid_str(struct sudoku *grid, const char *input) {
+    if (!input || !grid)
+        return false;
+
+    for (size_t i = 0; i < 9; ++i) {
+        int *line = grid->grid[i];
+
+        if (sscanf(input, INPUT_PATTERN, &line[0], &line[1], &line[2], &line[3],
+                   &line[4], &line[5], &line[6], &line[7], &line[8])
+            < 9)
+            return false;
+    }
+
+    return true;
+}

src/sudoku.h

@@ -0,0 +1,14 @@
+#ifndef SUDOKU_H
+#define SUDOKU_H
+
+#include <stdbool.h>
+#include <stdio.h>
+
+struct sudoku {
+    int grid[9][9];
+};
+
+bool parse_grid_file(struct sudoku *grid, FILE *input);
+bool parse_grid_str(struct sudoku *grid, const char *input);
+
+#endif /* !SUDOKU_H */