Read from file line.txt and output some strings.

Read from text file (line.txt),the content :

==============================================

This is the first line.

Another line.

Another line.

Another line.

Another line.

Still more.

Almost done now --

Almost done now --

Another line.

Still more.

Finished!

==============================================

Requirements:

If two or more lines of text adjacent to the same content, then print out one line, others no need to print.

#include <stdio.h>
#include <string.h>

#define MAX_LINE 128

int main()
{
    FILE *fp = NULL;
    char str[MAX_LINE] = {0};
    char tmp[MAX_LINE] = {0};
    long offset = 0;
    fpos_t pos;
    int flag = 0;

    if(!(fp= fopen("line.txt","r+")))
    {
        printf("File open error!\n");
        exit(0);
    }
    else
    {
        printf("Open file success!\n");
        /* seek the beginning of the file  */
        //fseek(fp,0,SEEK_SET);
        while(NULL != fgets(str,MAX_LINE,fp))
        {
            strcpy(tmp,str);
            fgets(str,MAX_LINE,fp);
            if(0 == strcmp(str,tmp))
            {
                fputs(tmp,stdout);
            }

        }
    }
    fclose(fp);

    return 0;
}

//some extent simple.