Libc-262.tar.gz

[apple/libc.git] / gen / pwcache.c

diff --git a/gen/pwcache.c b/gen/pwcache.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1989, 1993
+ *     The 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.
+ */
+
+
+#include <sys/types.h>
+
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <utmp.h>
+
+#define        NCACHE  64                      /* power of 2 */
+#define        MASK    NCACHE - 1              /* bits to store with */
+
+#ifdef NeXT
+/* lookupd caches users, so there's no point in another cache here */
+char *
+user_from_uid(uid, nouser)
+       uid_t uid;
+       int nouser;
+{
+       static struct passwd *pw;
+
+       if ((pw = getpwuid(uid)) == NULL) return (NULL);
+       return pw->pw_name;
+}
+#else
+char *
+user_from_uid(uid, nouser)
+       uid_t uid;
+       int nouser;
+{
+       static struct ncache {
+               uid_t   uid;
+               char    name[UT_NAMESIZE + 1];
+       } c_uid[NCACHE];
+       static int pwopen;
+       static char nbuf[15];           /* 32 bits == 10 digits */
+       register struct passwd *pw;
+       register struct ncache *cp;
+
+       cp = c_uid + (uid & MASK);
+       if (cp->uid != uid || !*cp->name) {
+               if (pwopen == 0) {
+                       setpassent(1);
+                       pwopen = 1;
+               }
+               if ((pw = getpwuid(uid)) == NULL) {
+                       if (nouser)
+                               return (NULL);
+                       (void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
+                       return (nbuf);
+               }
+               cp->uid = uid;
+               (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
+               cp->name[UT_NAMESIZE] = '\0';
+       }
+       return (cp->name);
+}
+#endif
+
+#ifdef NeXT
+/* lookupd caches groups, so there's no point in another cache here */
+char *
+group_from_gid(gid, nogroup)
+       gid_t gid;
+       int nogroup;
+{
+       static struct group *gr;
+
+       if ((gr = getgrgid(gid)) == NULL) return (NULL);
+       return gr->gr_name;
+}
+#else
+char *
+group_from_gid(gid, nogroup)
+       gid_t gid;
+       int nogroup;
+{
+       static struct ncache {
+               gid_t   gid;
+               char    name[UT_NAMESIZE + 1];
+       } c_gid[NCACHE];
+       static int gropen;
+       static char nbuf[15];           /* 32 bits == 10 digits */
+       struct group *gr;
+       struct ncache *cp;
+
+       cp = c_gid + (gid & MASK);
+       if (cp->gid != gid || !*cp->name) {
+               if (gropen == 0) {
+                       setgroupent(1);
+                       gropen = 1;
+               }
+               if ((gr = getgrgid(gid)) == NULL) {
+                       if (nogroup)
+                               return (NULL);
+                       (void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
+                       return (nbuf);
+               }
+               cp->gid = gid;
+               (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
+               cp->name[UT_NAMESIZE] = '\0';
+       }
+       return (cp->name);
+}
+#endif NeXT