sthaboutfunctionstrdup

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 <string.h>

 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 <syslib.h>       #include <string.h>         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;
}