1 files changed, 149 insertions, 0 deletions
diff --git a/gnu/usr.bin/tar/names.c b/gnu/usr.bin/tar/names.c
new file mode 100644
index 0000000..0de6a88
--- /dev/null
+++ b/gnu/usr.bin/tar/names.c
@@ -0,0 +1,149 @@
+/* Look up user and/or group names.
+   Copyright (C) 1988, 1992 Free Software Foundation
+
+This file is part of GNU Tar.
+
+GNU Tar is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Tar is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Tar; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * Look up user and/or group names.
+ *
+ * This file should be modified for non-unix systems to do something
+ * reasonable.
+ */
+
+#include <sys/types.h>
+#include "tar.h"
+#include "port.h"
+
+#ifndef NONAMES
+/* Whole module goes away if NONAMES defined.  Otherwise... */
+#include <stdio.h>
+#include <pwd.h>
+#include <grp.h>
+
+static int saveuid = -993;
+static char saveuname[TUNMLEN];
+static int my_uid = -993;
+
+static int savegid = -993;
+static char savegname[TGNMLEN];
+static int my_gid = -993;
+
+#define myuid	( my_uid < 0? (my_uid = getuid()): my_uid )
+#define	mygid	( my_gid < 0? (my_gid = getgid()): my_gid )
+
+/*
+ * Look up a user or group name from a uid/gid, maintaining a cache.
+ * FIXME, for now it's a one-entry cache.
+ * FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
+ *
+ * This is ifdef'd because on Suns, it drags in about 38K of "yellow
+ * pages" code, roughly doubling the program size.  Thanks guys.
+ */
+void
+finduname (uname, uid)
+     char uname[TUNMLEN];
+     int uid;
+{
+  struct passwd *pw;
+#ifndef HAVE_GETPWUID
+  extern struct passwd *getpwuid ();
+#endif
+
+  if (uid != saveuid)
+    {
+      saveuid = uid;
+      saveuname[0] = '\0';
+      pw = getpwuid (uid);
+      if (pw)
+	strncpy (saveuname, pw->pw_name, TUNMLEN);
+    }
+  strncpy (uname, saveuname, TUNMLEN);
+}
+
+int
+finduid (uname)
+     char uname[TUNMLEN];
+{
+  struct passwd *pw;
+  extern struct passwd *getpwnam ();
+
+  if (uname[0] != saveuname[0]	/* Quick test w/o proc call */
+      || 0 != strncmp (uname, saveuname, TUNMLEN))
+    {
+      strncpy (saveuname, uname, TUNMLEN);
+      pw = getpwnam (uname);
+      if (pw)
+	{
+	  saveuid = pw->pw_uid;
+	}
+      else
+	{
+	  saveuid = myuid;
+	}
+    }
+  return saveuid;
+}
+
+
+void
+findgname (gname, gid)
+     char gname[TGNMLEN];
+     int gid;
+{
+  struct group *gr;
+#ifndef HAVE_GETGRGID
+  extern struct group *getgrgid ();
+#endif
+
+  if (gid != savegid)
+    {
+      savegid = gid;
+      savegname[0] = '\0';
+      (void) setgrent ();
+      gr = getgrgid (gid);
+      if (gr)
+	strncpy (savegname, gr->gr_name, TGNMLEN);
+    }
+  (void) strncpy (gname, savegname, TGNMLEN);
+}
+
+
+int
+findgid (gname)
+     char gname[TUNMLEN];
+{
+  struct group *gr;
+  extern struct group *getgrnam ();
+
+  if (gname[0] != savegname[0]	/* Quick test w/o proc call */
+      || 0 != strncmp (gname, savegname, TUNMLEN))
+    {
+      strncpy (savegname, gname, TUNMLEN);
+      gr = getgrnam (gname);
+      if (gr)
+	{
+	  savegid = gr->gr_gid;
+	}
+      else
+	{
+	  savegid = mygid;
+	}
+    }
+  return savegid;
+}
+
+#endif