117 lines
2 KiB
C
117 lines
2 KiB
C
/* $Header$ */
|
|
/*
|
|
* get entry from group file
|
|
*
|
|
* By: Patrick van Kleef
|
|
*/
|
|
|
|
#include <grp.h>
|
|
|
|
#define PRIVATE static
|
|
|
|
PRIVATE char _gr_file[] = "/etc/group";
|
|
PRIVATE char _grbuf[256];
|
|
PRIVATE char _buffer[1024];
|
|
PRIVATE char *_pnt;
|
|
PRIVATE char *_buf;
|
|
PRIVATE int _gfd = -1;
|
|
PRIVATE int _bufcnt;
|
|
PRIVATE struct group grp;
|
|
|
|
setgrent ()
|
|
{
|
|
if (_gfd >= 0)
|
|
lseek (_gfd, 0L, 0);
|
|
else
|
|
_gfd = open (_gr_file, 0);
|
|
|
|
_bufcnt = 0;
|
|
return (_gfd);
|
|
}
|
|
|
|
|
|
endgrent ()
|
|
{
|
|
if (_gfd >= 0)
|
|
close (_gfd);
|
|
|
|
_gfd = -1;
|
|
_bufcnt = 0;
|
|
}
|
|
|
|
|
|
static getline ()
|
|
{
|
|
if (_gfd < 0 && setgrent () < 0)
|
|
return (0);
|
|
|
|
_buf = _grbuf;
|
|
do {
|
|
if (--_bufcnt <= 0){
|
|
if ((_bufcnt = read (_gfd, _buffer, 1024)) <= 0)
|
|
return (0);
|
|
else
|
|
_pnt = _buffer;
|
|
}
|
|
*_buf++ = *_pnt++;
|
|
} while (*_pnt != '\n');
|
|
_pnt++;
|
|
_bufcnt--;
|
|
*_buf = 0;
|
|
_buf = _grbuf;
|
|
return (1);
|
|
}
|
|
|
|
static skip_period ()
|
|
{
|
|
while (*_buf != ':')
|
|
_buf++;
|
|
*_buf++ = '\0';
|
|
}
|
|
|
|
struct group *getgrent ()
|
|
{
|
|
if (getline () == 0)
|
|
return (0);
|
|
|
|
grp.gr_name = _buf;
|
|
skip_period ();
|
|
grp.gr_passwd = _buf;
|
|
skip_period ();
|
|
grp.gr_gid = atoi (_buf);
|
|
skip_period ();
|
|
return (&grp);
|
|
}
|
|
|
|
struct group *getgrnam (name)
|
|
char *name;
|
|
{
|
|
struct group *grp;
|
|
|
|
setgrent ();
|
|
while ((grp = getgrent ()) != 0)
|
|
if (!strcmp (grp -> gr_name, name))
|
|
break;
|
|
endgrent ();
|
|
if (grp != 0)
|
|
return (grp);
|
|
else
|
|
return (0);
|
|
}
|
|
|
|
struct group *getgrgid (gid)
|
|
int gid;
|
|
{
|
|
struct group *grp;
|
|
|
|
setgrent ();
|
|
while ((grp = getgrent ()) != 0)
|
|
if (grp -> gr_gid == gid)
|
|
break;
|
|
endgrent ();
|
|
if (grp != 0)
|
|
return (grp);
|
|
else
|
|
return (0);
|
|
}
|