#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
typedef struct pos
{
    int abs_pos;
    int len;
} pos;
pos* allocate()
{
    pos* ret = (pos*)malloc(sizeof(pos));
    return ret;
}
int search (char* str, char c ,int len)
{
    int ret;
    for(int i = 0; i < len; i++)
    {
        if (str[i] == c)
        {
            //printf("%d\n", i);
            return i;
        }

    }
    return -1;

}

int main(int argc, char** argv)
{
    int j=0;
    int i = 0, k = 0, buff_size = 4, posv_len = 10,
            posv_num = 0, bytes_read, abs_pos = 0, str_pos = 0,end_pos = 0;
    char *buff = (char*)malloc(sizeof(char)*buff_size),*str_end;
    pos** posv = (pos**)malloc(sizeof(pos*)*posv_len);
    char path[50] = "/export/home/Admin/Desktop/test2";
    int file = open(path,O_RDONLY);
    if (file == -1)
    {
        printf("such file does not exist\n");
        return 0;
    }
    for(;;)
    {
        bytes_read = read(file,buff,buff_size);
        if ((bytes_read == 0))
        {

            break;
        }
        if (i>posv_len-1)
        {
            posv_len = posv_len+10;
            posv = (pos**)realloc(posv,sizeof(pos*)*posv_len);
        }

        for(;;)
        {
            j = search(&buff[str_pos+1],'\n', buff_size-str_pos);
            if (j == -1)
            {
                str_pos = 0;
                break;

            }
            str_pos = str_pos + j + 1;
            posv[i] = allocate();
            posv[i]->abs_pos = k*buff_size+str_pos;
            posv[i]->len = k*buff_size+str_pos - abs_pos;
            abs_pos = abs_pos + k*buff_size+str_pos;
            i++;
            if (j == buff_size-1)
            {
                str_pos = 0;
                break;
            }
        }
        k++;

    }

    printf("%d\n", i);
    for (k=0;k<i;k++)
    {
        printf("%d\n", posv[k]->abs_pos);
    }
    //printf("%d <- posv[0]", posv[1]->len);
    close(file);
    return (EXIT_SUCCESS);