自己实现strcpy函数

#include     //printf
#include     //ssert
#include     //malloc
#include     //strlen

char * sstrcpy(char * strdst, char * strsrc)
{
    char *dst = strdst;
    assert(strdst!=NULL && strsrc!=NULL);
    while((*strdst++ = *strsrc++)!= '')
        NULL;
    return dst; //实现链式表达式
}

//int num = strlen(strcpy(strdst,"hello world"));

int main(void)
{
    int num;
    char *strdst = (char *)malloc(sizeof(char)*100);

    if(strdst == NULL)
        return (-1);
    num = strlen(sstrcpy(strdst,"hello world"));
    printf("%d
", num);

    return 0;
}