c - 无法释放我所有的内存

Question

我是 C 的新手，很难完全理解指针
当前手头的任务是从结构命令中清除每个数组(结构显示在底部)。
希望有人能识别出一些可怕的错误，比如多次释放某些东西。我知道我的代码可能看起来很糟糕，但感谢您花时间查看它。
我目前尝试清除所有内容:

void clear_commands(Commands *commands) {
  Command *compile, *test, *temp;
  if (commands != NULL) {
    compile = commands->compile;
    while (compile != NULL) {
      temp = compile;
      compile = compile->next;
      free(temp);
    }

    test = commands->test;
    while (test != NULL) {
      temp = test;
      test = test->next;
      free(temp);
    }

    free(commands);
    commands = NULL;
  }
}

这些是类型定义:

typedef struct Command{
  char *command;
  struct Command *next;
} Command;

typedef struct {
  Command *test;
  Command *compile;
} Commands;

添加:read_commands

Commands read_commands(const char *compile_cmds, const char *test_cmds) {
  FILE *f;
  Commands *commands = malloc(sizeof(Commands));
  Command *compile, *test;
  char temp[257];

  if (compile_cmds == NULL || test_cmds == NULL)
    exit(0);

  compile = malloc(sizeof(Command));
  test = malloc(sizeof(Command));
  commands->compile = compile;
  commands->test = test;

  f = fopen(compile_cmds,"r");
  if (f != NULL)
    while(!feof(f)) {
      if(fgets(temp, 257, f) != NULL) {
        compile = malloc(sizeof(Command));
        compile->command = malloc(strlen(temp) + 1);
        strcpy(compile->command, temp);
        compile->next = malloc(sizeof(Command));
        compile = compile->next;
      }
    }
  fclose(f);
  ...
  return *commands;
}

Answer 1

Commands read_commands(const char *compile_cmds, const char *test_cmds) {
  FILE *f;
  Commands *commands = malloc(sizeof(Commands));
  Command *compile, *test;
  char temp[257];

  if (compile_cmds == NULL || test_cmds == NULL)
    exit(0);

  compile = malloc(sizeof(Command));
  test = malloc(sizeof(Command));
  commands->compile = compile;
  commands->test = test;

  f = fopen(compile_cmds,"r");
  if (f != NULL)
    while(!feof(f)) {
      if(fgets(temp, 257, f) != NULL) {
        compile->command = malloc(strlen(temp) + 1);
        strcpy(compile->command, temp);
        compile->next = malloc(sizeof(Command));
        compile = compile->next;
      }
    }
  fclose(f);
  ...
  return *commands;
}