boardparser.c

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

#include "sudoku.h"
#include "inputhandler.h"

#define LETTER_0 '0'

SudokuBoard* readBoard(FILE* fp) {
	SudokuBoard* board = newSudokuBoard();

	int row_i = 0;
	char* line;
	while (true) {
		line = getline(fp);
		if (line == NULL) { // EOF + Not enough rows given
			return NULL;
		}
		short row[BOARD_SIZE];
		int found = 0;
		for (int i = 0, n = strlen(line); i < n; i++) {
			char c = line[i];
			if (c == EOL) {
				break;
			}
			if (!isdigit(c) || found > BOARD_SIZE) {
				printf("invalid row item");
				free(line);
				return NULL;
			}
			row[found++] = c - LETTER_0;
		}

		free(line);
		if (found != BOARD_SIZE) {
			printf("invalid row size");
			return NULL;
		}

		setBoardRowValues(board, row_i++, row);
		if (row_i >= BOARD_SIZE) {
			break;
		}
	}
	return board;
}