c - 添加详细链接结构

Question

我写了这段代码:(上面的结构和下面的函数)

list * add_student(slist * students, char * name, int id) {
    slist * temp, * adder;

    if (!(adder = (slist * )
        malloc(sizeof(slist)))) exit(1);

    student * data;

    if (!(data = (student * )
        malloc(sizeof(student)))) exit(1);

    data - > name = name;
    data - > id = id;
    data - > courses = NULL;
    adder - > info = data;
    adder - > next = NULL;

    if (!students) {
        return adder;
    }

    for (temp = students; temp - > next; temp = temp - > next);
    temp - > next = adder;
    return students;
}

结构是:

typedef struct course {
    char *title;
    int  number;
    struct slist *students;
} course;

typedef struct slist {
    student      *info;
    struct slist *next;
} slist;

typedef struct clist {
    course       *info;
    struct clist *next;
} clist;

第一个函数应该将学生添加到学生列表中。它添加了学生，但如果我尝试添加另一个学生，则该名称将替换第一个学生的名称(仅名称而不是号码)。

我在代码中找不到错误，非常感谢您的帮助。

谢谢。

Answer 1

为名称分配内存并从名称参数中复制它:

list * add_student(slist * students, char * name, int id) {
  slist * temp, * adder;
  if (!(adder = (slist * ) malloc(sizeof(slist)))) exit(1);
  student * data;
  if (!(data = (student * ) malloc(sizeof(student)))) exit(1);
  if (!(data->name = (char * ) malloc(sizeof(char) * (strlen(name)+1)))) exit(1);
  strcpy(data->name, name);
  data->id = id;
  data->courses = NULL;
  adder->info = data;
  adder->next = NULL;
  if (!students) {
    return adder;
  }
  for (temp = students; temp - > next; temp = temp - > next);
  temp - > next = adder;
  return students;
}