op_result add_digit(int row, int col, int digit) {
if(in_range(row)){
if(in_range(col)){
if(in_range(digit)){
if(puzzle[row][col] != 0){
return OP_OCCUPIED;
}
if((row_contains(row,digit))||(col_contains(col,digit))){
return OP_ILLEGAL;
}
if(region_contains(row,col,digit)){
return OP_ILLEGAL;
}
puzzle[row][col] = digit;
return OP_OK;
}
}
}
return OP_BADARGS ;
}
void configure(FILE *puzzle_file) {
char line[5];//line buffer
int row;
int column;
int value;
int line_count = 0;
while(( fgets(line,5,puzzle_file)) != NULL){
row = line[0]-'0';
column = line[1]-'0';
value = line[2]-'0';
if(!in_range(row) || !in_range(column) || !in_range(value)){
printf("Illegal format in configuration file at line %d ", line_count);
exit(1);
}
if((puzzle[row][column] != 0)||(row_contains(row,value))||(col_contains(column,value))||(region_contains(row,column,value))){
printf("Illegal placement in configuration file at line %d ",line_count);
exit(1);
}
puzzle[row][column] = value;
fixed[row][column] = TRUE;
line_count += 1;
}
}
unsigned int sudoku_correct(char** arr, unsigned int x, unsigned int y) {
return !(row_contains(arr, x, y) || col_contains(arr, x, y) || square_contains(arr, x, y));
}
