C程序出现个问题，求解答（字符串赋值出现异常）

#include <stdio.h>
#include <string.h>

#define m0 30

typedef struct
{
char vec[m0];
int len;
} orderstring;


void maxcomstr(orderstring *s,orderstring *t)
{
int index = 0, length = 0, i, j, k, length1;
i = 0;
while (i <s->len)
{
j = 0;
while (j < t->len)
{
if(s->vec[i] == t->vec[j])
{
length1 = 1;
for(k = 1; s->vec[i+k] == t->vec[j+k] && s->vec[i+k] != NULL ; k++)
{
length1 = length1 + 1;
}
if(length1 > length)
{
index = i;
length = length1;
}
j+= length1;
}
else
{
j++;
}
}
i++;
}
printf("最长公共子串：");
for (i = 0; i < length; i++)
{
printf("%c",s->vec[index + 1]);
}
}

void main()
{
orderstring *r,*r1;
r->len = 11;
strcpy(r->vec,"aabcdababce");  //这个地方出现异常，请问如何给这个赋值

r1->len = 12;
strcpy(r1->vec,"12abcabcdace");

maxcomstr(r,r1);
}

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你的指针没有分配内存

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warning C4700: local variable 'r' used without ha