136 lines
2.3 KiB
C
136 lines
2.3 KiB
C
/*
|
|
* getgrent - get entry form group file
|
|
*
|
|
* Author: Patrick van Kleef
|
|
*/
|
|
/* $Header$ */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <grp.h>
|
|
|
|
#define O_RDONLY 0
|
|
|
|
int open(const char *path, int flags);
|
|
|
|
#if defined(__BSD4_2)
|
|
typedef int off_t; /* see lseek(2) */
|
|
#else
|
|
typedef long off_t;
|
|
#endif
|
|
|
|
off_t lseek(int d, off_t offset, int whence);
|
|
int read(int d, char *buf, int nbytes);
|
|
int close(int d);
|
|
|
|
#define RBUFSIZE 1024
|
|
static char _gr_file[] = "/etc/group";
|
|
static char _grbuf[256];
|
|
static char _buffer[RBUFSIZE];
|
|
static char *_pnt;
|
|
static char *_buf;
|
|
static int _gfd = -1;
|
|
static int _bufcnt;
|
|
static struct group grp;
|
|
|
|
int
|
|
setgrent(void)
|
|
{
|
|
if (_gfd >= 0)
|
|
lseek(_gfd, 0L, 0);
|
|
else
|
|
_gfd = open(_gr_file, O_RDONLY);
|
|
|
|
_bufcnt = 0;
|
|
return _gfd;
|
|
}
|
|
|
|
int
|
|
endgrent(void)
|
|
{
|
|
if (_gfd >= 0)
|
|
close(_gfd);
|
|
|
|
_gfd = -1;
|
|
_bufcnt = 0;
|
|
}
|
|
|
|
|
|
static int
|
|
getline(void)
|
|
{
|
|
if (_gfd < 0 && setgrent() < 0)
|
|
return 0;
|
|
|
|
_buf = _grbuf;
|
|
do {
|
|
if (--_bufcnt <= 0){
|
|
if ((_bufcnt = read(_gfd, _buffer, RBUFSIZE)) <= 0)
|
|
return 0;
|
|
else
|
|
_pnt = _buffer;
|
|
}
|
|
*_buf++ = *_pnt++;
|
|
} while (*_pnt != '\n');
|
|
_pnt++;
|
|
_bufcnt--;
|
|
*_buf = 0;
|
|
_buf = _grbuf;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
skip_period(void)
|
|
{
|
|
while (*_buf && *_buf != ':')
|
|
_buf++;
|
|
*_buf++ = '\0';
|
|
}
|
|
|
|
struct group *
|
|
getgrent(void)
|
|
{
|
|
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(const 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(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;
|
|
}
|