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