strstr库函数实现

#include<stdio.h>
#include<assert.h>

char *strstr(char* src,char *sub)
{
    if(src==NULL||NULL==sub)
    {
        return src;
    }

    const char *bp=src;
    const char *sp=sub;

    while(*src)
    {
        bp=src;
        sp=sub;
        do{
            if(!*sp)
                return src;
            }while(*bp++==*sp++);
        src+=;
    }

    return NULL;
}

int main()
{
    char p[]="";
    char q[]="";
    char *r=strstr(p,q);
    printf("r:%s\n",r);

    return ;
}