较长输入行折成多行

#include <stdio.h>
#include <stdlib.h>
#define MAXLENGTH 10
#define TAB 8
int dealtab(int position);
void printline(int position);
int findnoblank(int position);
int newposition(int position);
char line[MAXLENGTH+1];//from 1 to MAXLENGTH
int main()
{
    int position;
    char ch;
    position=0;
    while((ch=getchar())!=EOF){
        position++;
        line[position]=ch;
        if(ch=='\t'){
           position=dealtab(position);//位置最多不超过MAXLENGTH
        }
        else if(ch=='\n'){
            printline(position);
            position=0;
        }
        else if(position==MAXLENGTH){//||||||****，本行空格也输出。||||****||，本行后两个字符先不输出
            position=findnoblank(position);
            printline(position);
            position=newposition(position);
        }
    }


    return 0;
}
int dealtab(int position)
{
    for(;position<=MAXLENGTH&&position%TAB!=0;position++){
        line[position]=' ';
    }
    position--;
    if(position<MAXLENGTH)
        return position;
    else{
        printline(position);
        return 0;
    }

}
void printline(int position)
{
    for(int i=1;i<=position;i++)
        printf("%c",line[i]);
    putchar('\n');

}
int findnoblank(int position)
{
    while(line[position]!=' '&&position>=1)
        position--;
    if(position==0)
        return MAXLENGTH;
    else
        return position;

}
int newposition(int position)
{
    if(position==MAXLENGTH)
        return 0;
    else{
        int i,j;
        for(i=1,j=position+1;j<=MAXLENGTH;i++,j++)
            line[i]=line[j];
        i--;
        return i;
    }

}