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ingroups.c
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C/C++ Source or Header
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1994-04-15
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2KB
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68 lines
/*
* Program: Read directories
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 19 December 1993
* Last Edited: 14 April 1994
*
* Copyright 1994 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made available
* "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* Emulator for BSD initgroups() call
* Accepts: user name
* base group number or -1 if none
* Returns: non-zero if error
*/
#define NGROUPS 16
int initgroups (uname,agroup)
char *uname;
int agroup;
{
char tmp[MAILTMPLEN];
struct group *g;
int i,j,grps[NGROUPS],n = 0;
/* if initial group defined, add to list */
if (agroup >= 0) grps[n++] = agroup;
setgrent (); /* init /etc/groups files */
/* read file entries */
while ((n < NGROUPS) && (g = getgrent ()))
for (i = 0; g->gr_mem[i]; i++) {
/* uname matches? */
if (!strcmp (g->gr_mem[i],uname)) {
/* make sure not already there */
for (j = 0; (j < n) && (grps[j] != g->gr_gid); j++);
/* not found, add to list */
if (j >= n) grps[n++] = g->gr_gid;
}
}
endgrent (); /* finished with /etc/groups */
return setgroups (n,grps); /* set the group list */
}