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authorRoland McGrath <roland@gnu.org>1996-06-26 15:46:01 +0000
committerRoland McGrath <roland@gnu.org>1996-06-26 15:46:01 +0000
commitbba7bb78f3bc3be2dacafc336d1342fcc5c57489 (patch)
tree6afde133640ee2d36b719114c6bf24cc1341e4f9 /grp/initgroups.c
parentbe64fe6d86300687968ad072e8d7e15892386b5a (diff)
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Wed Jun 26 01:58:49 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* nss/nss_files/files-parse.c (parse_list): Count null in EOL calc. Move DB code into separate -ldb library. * db/Makefile (extra-libs): New variable, list libdb. (routines): Renamed to libdb-routines. * shlib-versions: Add libdb=2. * nss/network-lookup.c (DEFAULT_CONFIG): New macro. * nss/host-lookup.c (DEFAULT_CONFIG): New macro. * nss/nsswitch.c (nss_parse_service_list): Use __strncasecmp instead of strncasecmp. Extend syntax to grok [!foo=bar]. * sysdeps/generic/strncase.c: Define __strncasecmp with strncasecmp as weak alias. * string/string.h: Declare __strncasecmp. * nss/nsswitch.c (nss_parse_file): Call __getline, not getline. (service_alias): Variable removed. (nss_parse_service_list): New function, broken out of nss_getline. Remove alias conversion; we will just use symlinks. (__nss_database_lookup): Take new string arg DEFCONFIG. If no entry exists, make one with service list parsed from that. * nss/nsswitch.h: Update protocol for __nss_database_lookup. * nss/XXX-lookup.c (DEFAULT_CONFIG): New macro, set to 0 if undefined. (DB_LOOKUP_FCT): Pass it to _nss_database_lookup. * grp/initgroups.c: Rewritten using getgrent. Handle unlimited group list size. * sunrpc/xdr.c (xdr_int): #if 0 out unresolved references in dead code. Wed Jun 26 01:56:50 1996 Ulrich Drepper <drepper@cygnus.com> * locale/programs/locale.c (long_options): Short form of --version option is `-V'. (main): Recognize `-V' as option, not `-v'. Call `usage' instead of printing error message for illegal option. (usage): Document `-V'.
Diffstat (limited to 'grp/initgroups.c')
-rw-r--r--grp/initgroups.c67
1 files changed, 45 insertions, 22 deletions
diff --git a/grp/initgroups.c b/grp/initgroups.c
index 5af1926..a700557 100644
--- a/grp/initgroups.c
+++ b/grp/initgroups.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1989, 1991, 1993 Free Software Foundation, Inc.
+/* Copyright (C) 1989, 1991, 1993, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -31,43 +31,66 @@ int
DEFUN(initgroups, (user, group),
CONST char *user AND gid_t group)
{
-#ifdef NGROUPS_MAX
-#if NGROUPS_MAX == 0
+#if defined (NGROUPS_MAX) && NGROUPS_MAX == 0
+
+ /* No extra groups allowed. */
return 0;
+
#else
- static PTR info = NULL;
- register FILE *stream;
- register struct group *g;
- gid_t groups[NGROUPS_MAX];
+
+ struct group *g;
register size_t n;
+#ifdef NGROUPS_MAX
+ gid_t groups[NGROUPS_MAX];
+#else
+ long int limit = sysconf (_SC_NGROUPS_MAX);
+ gid_t *groups;
+ size_t ngroups;
- if (info == NULL)
- {
- info = __grpalloc();
- if (info == NULL)
- return -1;
- }
+ if (limit > 0)
+ ngroups = limit;
+ else
+ /* No fixed limit on groups. Pick a starting buffer size. */
+ ngroups = 16;
- stream = __grpopen();
- if (stream == NULL)
- return -1;
+ groups = __alloca (ngroups * sizeof *groups);
+#endif
+
+ setgrent ();
n = 0;
groups[n++] = group;
- while (n < NGROUPS_MAX && (g = __grpread(stream, info)) != NULL)
+ while ((g = getgrent ()) != NULL)
if (g->gr_gid != group)
{
register char **m;
for (m = g->gr_mem; *m != NULL; ++m)
- if (!strcmp(*m, user))
+ if (!strcmp (*m, user))
+ break;
+
+ if (*m == NULL)
+ {
+ /* Matched the user. Insert this group. */
+ if (n == ngroups && limit <= 0)
+ {
+ /* Need a bigger buffer. */
+ groups = memcpy (__alloca (ngroups * 2 * sizeof *groups),
+ groups, ngroups * sizeof *groups);
+ ngroups *= 2;
+ }
+
groups[n++] = g->gr_gid;
+
+ if (n == limit)
+ /* Can't take any more groups; stop searching. */
+ break;
+ }
}
- return setgroups(n, groups);
-#endif
-#else
- return 0;
+ endgrent ();
+
+ return setgroups (n, groups);
#endif
}