rk3

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFLEN 128

struct list{
    char *p_str;
    int i;
    struct list *next;
}*start=NULL;
struct list *prev;

FILE *fp;

void add(char *stroka)
{
    struct list *temp;
    if (check_number(stroka))
    {
        if((temp = (struct list*)malloc(sizeof(struct list))) == NULL)
        {
            printf("Memory overflow");
            exit(4);
        }
        if (start == NULL) start=temp;
        else prev->next=temp;
        temp->next=NULL;
        temp->p_str=stroka;
        temp->i=1;
        prev=temp;
    }
}

int main(int argc, char **argv)
{
    int i, end = 0;
    if(argc == 1)
        {
            printf("Enter the directory of file");
            exit(1);
    }
    if((fp=fopen(argv[1], "r")) == NULL)
    {
        printf("Open failed");
        exit(2);
    }
    do
    {
        c = fgetc(fp);
        if (c >= '0' && c <= '9')
            {
                buf[i] = c;
                i++;
            }
            else
            {
                buf[i] = '\0';
                if((end = i))
                {
                    if((p = (char*)malloc(sizeof(char)*(end+1))) == NULL)
                    {
                        printf("Memory overflow");
                        exit(4);
                    }
                strcpy(p, buf);
                    add(p);
                    }
        i = 0;
            }
    } while (c != EOF);
}