(set|get)_level

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

static bool invalid_level(int);
static int get_level(const char *);
static void set_level(const char *, int);

static const char *level_file = "typing.ini";

int main(void) {
  puts("set 1"); set_level(level_file, 1);
  printf("level: %d\n", get_level(level_file));
  puts("set 10"); set_level(level_file, 10);
  printf("level: %d\n", get_level(level_file));
  puts("set 5"); set_level(level_file, 5);
  printf("level: %d\n", get_level(level_file));
}

static bool invalid_level(int level) {
  return level < 1 || 8 < level;
}

static int get_level(const char *fname) {
  FILE *in = fopen(fname, "r");
  int level;
  fscanf(in, "%d", &level);
  fclose(in);
  if (invalid_level(level)) {
    return 1;
  }
  return level;
}

static void set_level(const char *fname, int level) {
  if (invalid_level(level)) {
    return;
  }
  FILE *out = fopen(fname, "w");
  fprintf(out, "%d\n", level);
  fclose(out);
}