fixes from donn@utah-cs.

[unix-history] / usr / src / usr.bin / lastcomm / lastcomm.c

#ifndef lint
static char *sccsid = "@(#)lastcomm.c   4.14 (Berkeley) %G%";
#endif

/*
* last command
*/
#include <sys/param.h>
#include <sys/acct.h>
#include <sys/file.h>

#include <stdio.h>
#include <pwd.h>
#include <sys/stat.h>
#include <utmp.h>
#include <struct.h>
#include <ctype.h>

struct  acct buf[DEV_BSIZE / sizeof (struct acct)];

time_t  expand();
char    *flagbits();
char    *getname();
char    *getdev();

main(argc, argv)
       char *argv[];
{
       register int bn, cc;
       register struct acct *acp;
       int fd;
       struct stat sb;

       fd = open("/usr/adm/acct", O_RDONLY);
       if (fd < 0) {
               perror("/usr/adm/acct");
               exit(1);
       }
       fstat(fd, &sb);
       for (bn = btodb(sb.st_size); bn >= 0; bn--) {
               lseek(fd, dbtob(bn), L_SET);
               cc = read(fd, buf, DEV_BSIZE);
               if (cc < 0) {
                       perror("read");
                       break;
               }
               acp = buf + (cc / sizeof (buf[0])) - 1;
               for (; acp >= buf; acp--) {
                       register char *cp;
                       time_t x;

                       if (acp->ac_comm[0] == '\0')
                               strcpy(acp->ac_comm, "?");
                       for (cp = &acp->ac_comm[0];
                            cp < &acp->ac_comm[fldsiz(acct, ac_comm)] && *cp;
                            cp++)
                               if (!isascii(*cp) || iscntrl(*cp))
                                       *cp = '?';
                       if (argc > 1 && !ok(argc, argv, acp))
                               continue;
                       x = expand(acp->ac_utime) + expand(acp->ac_stime);
                       printf("%-*s %s %-*s %-*s %6.2f secs %.16s\n",
                               fldsiz(acct, ac_comm), acp->ac_comm,
                               flagbits(acp->ac_flag),
                               fldsiz(utmp, ut_name), getname(acp->ac_uid),
                               fldsiz(utmp, ut_line), getdev(acp->ac_tty),
                               x / (double)AHZ, ctime(&acp->ac_btime));
               }
       }
}

time_t
expand (t)
       unsigned t;
{
       register time_t nt;

       nt = t & 017777;
       t >>= 13;
       while (t) {
               t--;
               nt <<= 3;
       }
       return (nt);
}

char *
flagbits(f)
       register int f;
{
       register int i = 0;
       static char flags[20];

#define BIT(flag, ch)   flags[i++] = (f & flag) ? ch : ' '
       BIT(ASU, 'S');
       BIT(AFORK, 'F');
       BIT(ACOMPAT, 'C');
       BIT(ACORE, 'D');
       BIT(AXSIG, 'X');
       flags[i] = '\0';
       return (flags);
}

ok(argc, argv, acp)
       register int argc;
       register char *argv[];
       register struct acct *acp;
{
       register int j;

       for (j = 1; j < argc; j++)
               if (strcmp(getname(acp->ac_uid), argv[j]) &&
                   strcmp(getdev(acp->ac_tty), argv[j]) &&
                   strncmp(acp->ac_comm, argv[j], fldsiz(acct, ac_comm)))
                       break;
       return (j == argc);
}

/* should be done with nameserver or database */

struct  utmp utmp;

#define NUID    2048
#define NMAX    (sizeof (utmp.ut_name))

char    names[NUID][NMAX+1];
char    outrangename[NMAX+1];
int     outrangeuid = -1;

char *
getname(uid)
{
       register struct passwd *pw;
       static init;
       struct passwd *getpwent();

       if (uid >= 0 && uid < NUID && names[uid][0])
               return (&names[uid][0]);
       if (uid >= 0 && uid == outrangeuid)
               return (outrangename);
       if (init == 2) {
               if (uid < NUID)
                       return (0);
               setpwent();
               while (pw = getpwent()) {
                       if (pw->pw_uid != uid)
                               continue;
                       outrangeuid = pw->pw_uid;
                       strncpy(outrangename, pw->pw_name, NMAX);
                       endpwent();
                       return (outrangename);
               }
               endpwent();
               return (0);
       }
       if (init == 0)
               setpwent(), init = 1;
       while (pw = getpwent()) {
               if (pw->pw_uid < 0 || pw->pw_uid >= NUID) {
                       if (pw->pw_uid == uid) {
                               outrangeuid = pw->pw_uid;
                               strncpy(outrangename, pw->pw_name, NMAX);
                               return (outrangename);
                       }
                       continue;
               }
               if (names[pw->pw_uid][0])
                       continue;
               strncpy(names[pw->pw_uid], pw->pw_name, NMAX);
               if (pw->pw_uid == uid)
                       return (&names[uid][0]);
       }
       init = 2;
       endpwent();
       return (0);
}

#include <sys/dir.h>

#define N_DEVS          43              /* hash value for device names */
#define NDEVS           500             /* max number of file names in /dev */

struct  devhash {
       dev_t   dev_dev;
       char    dev_name [fldsiz(utmp, ut_line) + 1];
       struct  devhash * dev_nxt;
};
struct  devhash *dev_hash[N_DEVS];
struct  devhash *dev_chain;
#define HASH(d) (((int) d) % N_DEVS)

setupdevs()
{
       register DIR * fd;
       register struct devhash * hashtab;
       register ndevs = NDEVS;
       struct direct * dp;

       if ((fd = opendir("/dev")) == NULL) {
               perror("/dev");
               return;
       }
       hashtab = (struct devhash *)malloc(NDEVS * sizeof(struct devhash));
       if (hashtab == (struct devhash *)0) {
               fprintf(stderr, "No mem for dev table\n");
               closedir(fd);
               return;
       }
       while (dp = readdir(fd)) {
               if (dp->d_ino == 0)
                       continue;
               if (dp->d_name[0] != 't' && strcmp(dp->d_name, "console"))
                       continue;
               strncpy(hashtab->dev_name, dp->d_name, fldsiz(utmp, ut_line));
               hashtab->dev_name[fldsiz(utmp, ut_line)] = 0;
               hashtab->dev_nxt = dev_chain;
               dev_chain = hashtab;
               hashtab++;
               if (--ndevs <= 0)
                       break;
       }
       closedir(fd);
}

char *
getdev(dev)
       dev_t dev;
{
       register struct devhash *hp, *nhp;
       struct stat statb;
       char name[fldsiz(devhash, dev_name) + 6];
       static dev_t lastdev = (dev_t) -1;
       static char *lastname;
       static int init = 0;

       if (dev == NODEV)
               return ("__");
       if (dev == lastdev)
               return (lastname);
       if (!init) {
               setupdevs();
               init++;
       }
       for (hp = dev_hash[HASH(dev)]; hp; hp = hp->dev_nxt)
               if (hp->dev_dev == dev) {
                       lastdev = dev;
                       return (lastname = hp->dev_name);
               }
       for (hp = dev_chain; hp; hp = nhp) {
               nhp = hp->dev_nxt;
               strcpy(name, "/dev/");
               strcat(name, hp->dev_name);
               if (stat(name, &statb) < 0)     /* name truncated usually */
                       continue;
               if ((statb.st_mode & S_IFMT) != S_IFCHR)
                       continue;
               hp->dev_dev = statb.st_rdev;
               hp->dev_nxt = dev_hash[HASH(hp->dev_dev)];
               dev_hash[HASH(hp->dev_dev)] = hp;
               if (hp->dev_dev == dev) {
                       dev_chain = nhp;
                       lastdev = dev;
                       return (lastname = hp->dev_name);
               }
       }
       dev_chain = (struct devhash *) 0;
       return ("??");
}