Initial revision

1 files changed, 80 insertions, 0 deletions

diff --git a/libc/pwd_grp/initgroups.c b/libc/pwd_grp/initgroups.c
new file mode 100644
index 000000000..35e1d03ec
--- /dev/null
+++ b/libc/pwd_grp/initgroups.c
@@ -0,0 +1,80 @@
+/*
+ * initgroups.c - This file is part of the libc-8086/grp package for ELKS,
+ * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
+ * 
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <grp.h>
+#include "config.h"
+
+int
+initgroups(__const char * user, gid_t gid)
+{
+  register struct group * group;
+#ifndef GR_DYNAMIC_GROUP_LIST
+  gid_t group_list[GR_MAX_GROUPS];
+#else
+  gid_t * group_list=NULL;
+#endif
+  register char ** tmp_mem;
+  int num_groups;
+  int grp_fd;
+
+
+  if ((grp_fd=open("/etc/group", O_RDONLY))<0)
+    return -1;
+
+  num_groups=0;
+#ifdef GR_DYNAMIC_GROUP_LIST
+  group_list=(gid_t *) realloc(group_list, 1);
+#endif
+  group_list[num_groups]=gid;
+#ifndef GR_DYNAMIC_GROUP_LIST
+  while (num_groups<GR_MAX_GROUPS &&
+	 (group=__getgrent(grp_fd))!=NULL)
+#else
+  while ((group=__getgrent(grp_fd))!=NULL)
+#endif      
+    {
+      if (group->gr_gid!=gid);
+        {
+	  tmp_mem=group->gr_mem;
+	  while(*tmp_mem!=NULL)
+	    {
+	      if (!strcmp(*tmp_mem, user))
+		{
+		  num_groups++;
+#ifdef GR_DYNAMIC_GROUP_LIST  
+		  group_list=(gid_t *)realloc(group_list,
+					      num_groups*sizeof(gid_t *));
+#endif		  
+		  group_list[num_groups]=group->gr_gid;
+		}
+	      tmp_mem++;
+	    }
+	}
+    }
+  close(grp_fd);
+  return setgroups(num_groups, group_list);
+}
+
+
+
+