From 7b83e8e87798c10a9c42070ca9200ec8d0cf6ce6 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Tue, 26 Jul 1994 03:44:47 +0000 Subject: [PATCH] GNU shell utilities --- lib/group-member.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++ lib/group-member.h | 7 +++ lib/mktime.c | 19 +++++-- 3 files changed, 179 insertions(+), 5 deletions(-) create mode 100644 lib/group-member.c create mode 100644 lib/group-member.h diff --git a/lib/group-member.c b/lib/group-member.c new file mode 100644 index 000000000..f9bb8fcd4 --- /dev/null +++ b/lib/group-member.c @@ -0,0 +1,158 @@ +/* group-member.c -- determine whether group id is in calling user's group list + Copyright (C) 1994 Free Software Foundation, Inc. + + This program 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. + + This program 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 this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#ifdef HAVE_CONFIG_H +#if defined (CONFIG_BROKETS) +/* We use instead of "config.h" so that a compilation + using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h + (which it would do because it found this file in $srcdir). */ +#include +#else +#include "config.h" +#endif +#endif + +#include +#include + +#ifdef STDC_HEADERS +#include +#endif + +#ifdef HAVE_UNISTD_H +#include +#endif + +#include "group-member.h" + +char *xmalloc (); +char *xrealloc (); + +struct group_info + { + int n_groups; + GETGROUPS_T *group; + }; + +#ifdef HAVE_GETGROUPS + +static void +free_group_info (g) + struct group_info *g; +{ + free (g->group); + free (g); +} + +static struct group_info * +get_group_info () +{ + int n_groups; + int n_group_slots; + struct group_info *gi; + GETGROUPS_T *group; + + /* getgroups () returns the number of elements that it was able to + place into the array. We simply continue to call getgroups () + until the number of elements placed into the array is smaller than + the physical size of the array. */ + + group = NULL; + n_groups = 0; + n_group_slots = 0; + while (n_groups == n_group_slots) + { + n_group_slots += 64; + group = (GETGROUPS_T *) xrealloc (group, + n_group_slots * sizeof (GETGROUPS_T)); + n_groups = getgroups (n_group_slots, group); + } + + /* In case of error, the user loses. */ + if (n_groups < 0) + { + free (group); + return NULL; + } + + gi = (struct group_info *) xmalloc (sizeof (*gi)); + gi->n_groups = n_groups; + gi->group = group; + + return gi; +} + +#endif /* not HAVE_GETGROUPS */ + +/* Return non-zero if GID is one that we have in our groups list. + If there is no getgroups function, return non-zero if GID matches + either of the current or effective group IDs. */ + +int +group_member (gid) + gid_t gid; +{ +#ifndef HAVE_GETGROUPS + return ((gid == getgid ()) || (gid == getegid ())); +#else + int i; + int found; + struct group_info *gi; + + gi = get_group_info (); + if (gi == NULL) + return 0; + + /* Search through the list looking for GID. */ + found = 0; + for (i = 0; i < gi->n_groups; i++) + { + if (gid == gi->group[i]) + { + found = 1; + break; + } + } + + free_group_info (gi); + + return found; +#endif /* HAVE_GETGROUPS */ +} + +#ifdef TEST + +char *program_name; + +int +main (int argc, char** argv) +{ + int i; + + program_name = argv[0]; + + for (i=1; ifoo < x) \ { \ me->bar--; \ - me->foo = (y - (x - me->foo)); \ + me->foo = (y - (x - me->foo) + 1); \ } \ while (me->foo > y) \ { \ + me->foo = (x + (me->foo - y) - 1); \ me->bar++; \ - me->foo = (x + (me->foo - y)); \ } normalize (tm_sec, 0, 59, tm_min); @@ -240,8 +241,14 @@ _mktime_internal (timeptr, producer) /* Do the month first, so day range can be found. */ normalize (tm_mon, 0, 11, tm_year); + + /* Since the day range modifies the month, we should be careful how + we reference the array of month lengths -- it is possible that + the month will go negative, hence the %... */ normalize (tm_mday, 1, - __mon_lengths[__isleap (me->tm_year)][me->tm_mon], + __mon_lengths[__isleap (me->tm_year)][((me->tm_mon < 0) + ? (12 + (me->tm_mon % 12)) + : (me->tm_mon % 12)) ], tm_mon); /* Do the month again, because the day may have pushed it out of range. */ @@ -249,7 +256,9 @@ _mktime_internal (timeptr, producer) /* Do the day again, because the month may have changed the range. */ normalize (tm_mday, 1, - __mon_lengths[__isleap (me->tm_year)][me->tm_mon], + __mon_lengths[__isleap (me->tm_year)][((me->tm_mon < 0) + ? (12 + (me->tm_mon % 12)) + : (me->tm_mon % 12)) ], tm_mon); #ifdef DEBUG -- 2.11.0