假设串采用链接存贮结构，链表中每个结点只存放1个字符，试编写一个实现比较链串相等的算法。

RT
求高手解答

typedef struct character {
char ch;
struct character *next;
}*astring;

int strcmp(astring A,astring B} {
astring pa = A->next,pb = B->next;
while((pa != NULL) && (pb != NULL)) {
if(pa->ch > pb->ch) return 1;
else if(pa->ch < pb->ch) return -1;
pa = pa->next;
pb = pb->next;
}
if((pa == NULL) && (pb == NULL)) return 0;
if((pa != NULL) && (pb == NULL)) return 1;
if((pa == NULL) && (pb != NULL)) return -1;
}