sth about the string function strdup

As now I was using the fundtion strdup very often, so that I want to say sth about it,  and I think that it just a function that combines the functions malloc and strcpy.

  用法：#include

 功能：复制字符串s

 

 说明：返回指向被复制的字符串的指针，所需空间由malloc()分配且可以由free()释放。

 

 举例：

 

 

      // strdup.c

     

      #include

      #include

 

      main()

      {

        char *s="this is just f";

        char *d;

       

        d=strdup(s);

        printf("%s",d);

 

        getchar();

        return 0;

      }

strdup()主要是拷贝字符串s的一个副本，由函数返回值返回，这个副本有自己的内存空间，和s不相干。

char *strdup(const char *s)
{
        char *t = NULL;
        if (s && (t = (char*)malloc(strlen(s) + 1)))
        strcpy(t, s);
        return t;
}