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 7e2d050..9989413 100644 (file)
--- a/usr/src/usr.bin/users/users.c
+++ b/usr/src/usr.bin/users/users.c
@@ -2,17 +2,33 @@
  * Copyright (c) 1980, 1987 Regents of the University of California.
  * All rights reserved.
  *
  * Copyright (c) 1980, 1987 Regents of the University of California.
  * All rights reserved.
  *

- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley.  The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * 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
  */
 
 #ifndef lint


@@ -22,75 +38,64 @@ char copyright[] =
 #endif /* not lint */
 
 #ifndef lint
 #endif /* not lint */
 
 #ifndef lint

-static char sccsid[] = "@(#)users.c    5.6 (Berkeley) %G%";
+static char sccsid[] = "@(#)users.c    5.12 (Berkeley) 11/1/90";

 #endif /* not lint */
 
 #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 NMAX           sizeof(utmp.ut_name)
-#define MAXUSERS       200
-#define UTMP_FILE      "/etc/utmp"
+#define        MAXUSERS        200

 
 

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

 {
 {

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

 
 

-       if (!(fp = fopen(UTMP_FILE, "r"))) {
-               perror(UTMP_FILE);
+       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);
        }
                exit(1);
        }

-       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;

                }
                }

-       summary();
-       exit(0);
-}

 
 

-nsave()
-{
-       static char **namp = names;     /* pointer to names table */
-       char *calloc();
-
-       if (!(*namp = calloc((u_int)(NMAX + 1), sizeof(char)))) {
-               fputs("users: malloc error.\n", stderr);
-               exit(1);
-       }
-       bcopy(utmp.ut_name, *namp++, NMAX);
-}
-
-summary()
-{
-       register char **p;
-       int scmp();
-
-       if (!ncnt)
-               return;
-       qsort((char *)names, ncnt, sizeof(names[0]), scmp);
-       fputs(names[0], stdout);
-       for (p = &names[1]; --ncnt; ++p) {
-               putchar(' ');
-               fputs(*p, stdout);
+       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)
 }
 
 scmp(p, q)

-       char **p, **q;
+       char *p, *q;

 {
 {

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

 }
 }