#include <stdio.h>
#include <stdlib.h>
#define maxsize 20

static ssize_t  mygetline(char **lineptr, size_t *n, FILE *stream)
{
        ssize_t count=0;
        int buf;

        if(*lineptr == NULL)
//        free(*lineptr);
    {
        *n=maxsize;
            *lineptr = malloc(*n);
    }

    if((buf=fgetc(stream))==EOF)
    {
        return -1;
    }
    
    while((buf=fgetc(stream))!=EOF)
    {
        if(buf=='\n')
        {    
             count+=1;
                  break;
        }

        count++;

        *(*lineptr+count-1)=buf;
        *(*lineptr+count)='\0';
        
        if(*n<=count)
        *lineptr=realloc(*lineptr,count*2);
    }

    return count;
}

int main(int argc,char *argv[])
{
    FILE *fp;
    char *linebuf;
    size_t linesize;
    int n;
        
    fp = fopen(argv[1],"r");
    if(fp == NULL)
    {
        perror("fopen()");
        exit(1);
    }

    linebuf = NULL;
    linesize = 0;
    
    while(1)
    {
        if((n= mygetline(&linebuf,&linesize,fp)) < 0)
            break;
        printf("%d\n",n);
        printf("%s\n",linebuf);
    }
        if(linebuf)
        free(linebuf);

    fclose(fp);
    return 0;
}