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