libbb/my_getgrgid.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

  /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
  * flexible :
  *
  * if bufsize is > 0 char *group cannot be set to NULL
  *                   on success groupname is written on static allocated buffer
  *                   on failure gid as string is written to buffer and NULL is returned
  * if bufsize is = 0 char *group can be set to NULL
  *                   on success groupname is returned 
  *                   on failure NULL is returned
  * if bufsize is < 0 char *group can be set to NULL
  *                   on success groupname is returned
  *                   on failure an error message is printed and the program exits   
  */
  
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "libbb.h"
#include "pwd_.h"
#include "grp_.h"


/* gets a groupname given a gid */
char * my_getgrgid(char *group, long gid, int bufsize)
{
	struct group *mygroup;

	mygroup  = getgrgid(gid);
	if (mygroup==NULL) {
		if(bufsize > 0) {
			assert(group != NULL);
			snprintf(group, bufsize, "%ld", (long)gid);
		}
		if( bufsize < 0 ) {
			bb_error_msg_and_die("unknown gid %ld", (long)gid);
		} 
		return NULL;
	} else {
		if(bufsize > 0)
		{
			assert(group != NULL);
			return safe_strncpy(group, mygroup->gr_name, bufsize);
		}
		return mygroup->gr_name;
	}
}


/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/