BSD 4_1c_2 release

[unix-history] / usr / src / usr.lib / undoc / libpriv / alterfile.c

static char sccsid[] = "@(#)alterfile.c 4.4 (Melbourne) 82/02/27";

/*
* userprivs file conversion program
*
*      This utility converts the userprivs file
*      from one form to another, after a modification to
*      the basic structure definition
*
* method
*      put the new structure in "./udata.h"
*      and the old defn in "/usr/include/udata.h"
*
*      add/remove code below so that all fields in the old structure
*      that still exist in the new one are copied
*
*      run the program
*/

#include <stdio.h>
#include <arrays.h>
#include <sys/types.h>
#define udata Udata
#include <udata.h>
#undef  udata
#include "udata.h"

struct udata new, zero;
struct Udata old;

main()
{
       register fd, nfd, i;

       if ((fd = open(UPRIVFILE, 0)) < 0) {
               perror(UPRIVFILE);
               exit(1);
       }
       if (link(UPRIVFILE, "/usr/adm/oldprivs") < 0) {
               perror("/usr/adm/oldprivs");
               exit(1);
       }
       if (unlink(UPRIVFILE) < 0) {
               perror("unlink");
               exit(1);
       }
       if ((nfd = creat(UPRIVFILE, 0444)) < 0) {
               perror(UPRIVFILE);
               link("/usr/adm/oldprivs", UPRIVFILE);
               exit(1);
       }
       while (read(fd, &old, sizeof old) == sizeof old) {
               if (allzero(&old, sizeof old)) {
                       lseek(nfd, (long)sizeof old, 1);
                       continue;
               }
               new = zero;     /* not necessary, but it doesn't hurt either */

               for (i = 0; i < elmts(old.ud_flags); i++)
                       if (i < elmts(new.ud_flags))
                               new.ud_flags[i] = old.ud_flags[i];
               new.ud_maxrss = old.ud_maxrss;
               new.ud_maxfile = old.ud_maxfile;
               new.ud_maxcore = old.ud_maxcore;
               new.ud_maxstack = old.ud_maxstack;
               new.ud_maxdata = old.ud_maxdata;
               new.ud_maxcpu = old.ud_maxcpu;
               new.ud_raise = old.ud_raise;
               new.ud_ttys = old.ud_ttys;
               new.ud_maxlogin = old.ud_maxlogin;
               new.ud_umask = old.ud_umask;
               new.ud_expires = old.ud_expires;

               new.ud_logon[0].tr_low.xt_ok = 0;
               new.ud_logon[0].tr_high.xt_ok = 0;

               if (write(nfd, &new, sizeof new) != sizeof new) {
                       perror("write");
                       exit(1);
               }
       }
       exit(0);
}

allzero(addr, size)
       register char *addr;
       register size;
{
       while (size-- > 0)
               if (*addr++)
                       return(0);
       return(1);
}