125 lines
1.7 KiB
C
125 lines
1.7 KiB
C
/*
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* get entry from password file
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*
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* By Patrick van Kleef
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*
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*/
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#include <pwd.h>
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#define PRIVATE static
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PRIVATE char _pw_file[] = "/etc/passwd";
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PRIVATE char _pwbuf[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 _pw = -1;
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PRIVATE int _bufcnt;
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PRIVATE struct passwd pwd;
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setpwent()
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{
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if (_pw >= 0)
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lseek (_pw, 0L, 0);
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else
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_pw = open (_pw_file, 0);
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_bufcnt = 0;
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return (_pw);
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}
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endpwent ()
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{
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if (_pw >= 0)
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close (_pw);
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_pw = -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 (_pw < 0 && setpwent () < 0)
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return (0);
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_buf = _pwbuf;
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do {
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if (--_bufcnt <= 0){
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if ((_bufcnt = read (_pw, _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 = _pwbuf;
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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 != ':')
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_buf++;
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*_buf++ = '\0';
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}
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struct passwd *getpwent ()
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{
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if (getline () == 0)
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return (0);
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pwd.pw_name = _buf;
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skip_period ();
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pwd.pw_passwd = _buf;
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skip_period ();
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pwd.pw_uid = atoi (_buf);
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skip_period ();
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pwd.pw_gid = atoi (_buf);
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skip_period ();
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pwd.pw_gecos = _buf;
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skip_period ();
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pwd.pw_dir = _buf;
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skip_period ();
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pwd.pw_shell = _buf;
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return (&pwd);
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}
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struct passwd *getpwnam (name)
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char *name;
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{
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struct passwd *pwd;
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setpwent ();
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while ((pwd = getpwent ()) != 0)
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if (!strcmp (pwd -> pw_name, name))
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break;
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endpwent ();
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if (pwd != 0)
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return (pwd);
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else
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return (0);
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}
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struct passwd *getpwuid (uid)
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int uid;
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{
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struct passwd *pwd;
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setpwent ();
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while ((pwd = getpwent ()) != 0)
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if (pwd -> pw_uid == uid)
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break;
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endpwent ();
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if (pwd != 0)
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return (pwd);
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else
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return (0);
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}
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