386BSD 0.0 development

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

diff --git a/usr/src/usr.bin/users/users.c b/usr/src/usr.bin/users/users.c
index 4a0a8a8..9989413 100644 (file)
--- a/usr/src/usr.bin/users/users.c
+++ b/usr/src/usr.bin/users/users.c
@@ -1,97 +1,101 @@
 /*
 /*

- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1980, 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.

  */
 
 #ifndef lint
 char copyright[] =
  */
 
 #ifndef lint
 char copyright[] =

-"@(#) Copyright (c) 1980 Regents of the University of California.\n\
+"@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\

  All rights reserved.\n";
  All rights reserved.\n";

-#endif not lint
+#endif /* not lint */

 
 #ifndef lint
 
 #ifndef lint

-static char sccsid[] = "@(#)users.c    5.3 (Berkeley) %G%";
-#endif not lint
+static char sccsid[] = "@(#)users.c    5.12 (Berkeley) 11/1/90";
+#endif /* not lint */

 
 

-/*
- * users
- */

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

-#define ERREXIT                1
-#define OKEXIT         0
-#define NMAX           sizeof(utmp.ut_name)
-#define MAXUSERS       200
+#define        MAXUSERS        200

 
 

-static struct utmp     utmp;           /* read structure */
-static int     ncnt;                   /* count of names */
-static char    *names[MAXUSERS],       /* names table */
-               **namp;                 /* pointer to names table */
-
-main(argc,argv)
-int    argc;
-char   **argv;
+main(argc, argv)
+       int argc;
+       char **argv;

 {
 {

-       register FILE   *fp;            /* file pointer */
-       char    *fname;
+       extern int optind;
+       register int cnt, ncnt;
+       struct utmp utmp;
+       char names[MAXUSERS][UT_NAMESIZE];
+       int ch, scmp();

 
 

-       if (argc > 2) {
-               fputs("usage: users [ utmp_file ]\n",stderr);
-               exit(ERREXIT);
-       }
-       fname = argc == 2 ? argv[1] : "/etc/utmp";
-       if (!(fp = fopen(fname,"r"))) {
-               perror(fname);
-               exit(ERREXIT);
+       while ((ch = getopt(argc, argv, "")) != EOF)
+               switch(ch) {
+               case '?':
+               default:
+                       (void)fprintf(stderr, "usage: users\n");
+                       exit(1);
+               }
+       argc -= optind;
+       argv += optind;
+
+       if (!freopen(_PATH_UTMP, "r", stdin)) {
+               (void)fprintf(stderr, "users: can't open %s.\n", _PATH_UTMP);
+               exit(1);

        }
        }

-       namp = names;
-       while (fread((char *)&utmp,sizeof(utmp),1,fp) == 1)
+       for (ncnt = 0;
+           fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1;)

                if (*utmp.ut_name) {
                if (*utmp.ut_name) {

-                       if (++ncnt > MAXUSERS) {
-                               ncnt = MAXUSERS;
-                               fputs("users: too many users.\n",stderr);
+                       if (ncnt == MAXUSERS) {
+                               (void)fprintf(stderr,
+                                   "users: too many users.\n");

                                break;
                        }
                                break;
                        }

-                       nsave();
+                       (void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
+                       ++ncnt;

                }
                }

-       if (ncnt)
-               summary();
-       exit(OKEXIT);
-}
-
-nsave()
-{
-       char    *calloc();
-
-       if (!(*namp = calloc((u_int)(NMAX + 1),sizeof(char)))) {
-               fputs("users: malloc error.\n",stderr);
-               exit(ERREXIT);
-       }
-       bcopy(utmp.ut_name,*namp++,NMAX);
-}
-
-summary()
-{
-       register char   **p,
-                       **q;
-       int     scmp();

 
 

-       qsort((char *)names,ncnt,sizeof(names[0]),scmp);
-       for (p = names;p < namp;p = q) {
-               if (p != names)
-                       putchar(' ');
-               fputs(*p,stdout);
-               for (q = p + 1;q < namp && !strcmp(*q,*p);++q);
+       if (ncnt) {
+               qsort(names, ncnt, UT_NAMESIZE, scmp);
+               (void)printf("%.*s", UT_NAMESIZE, names[0]);
+               for (cnt = 1; cnt < ncnt; ++cnt)
+                       if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE))
+                               (void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
+               (void)printf("\n");

        }
        }

-       putchar('\n');
+       exit(0);

 }
 
 }
 

-scmp(p,q)
-char   **p,
-       **q;
+scmp(p, q)
+       char *p, *q;

 {
 {

-       return(strcmp(*p,*q));
+       return(strncmp(p, q, UT_NAMESIZE));

 }
 }