getpw.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char sccsid[] = "@(#)getpw.c	4.1 (decvax!larry) 7/2/90";
#endif

#include "stdio.h"

/*
 *  return passwd entry corresponding to uid
 *
 *  return codes:  0 == success
 *		   1 == failure - could not find passwd entry
 */




/************************************************************************
 *									*
 *			Copyright (c) 1984 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/





getpw(uid, buf)
int uid;
char buf[];
{
	static FILE *pwf;
	register n, c;
	register char *bp;

	if(pwf == 0)
		pwf = fopen("/etc/passwd", "r");
	if(pwf == NULL)
		return(1);
	rewind(pwf);
	uid &= 0377;

	for (;;) {
		bp = buf;
		while((c=getc(pwf)) != '\n') {
			if(c <= 0)
				return(1);
			*bp++ = c;
		}
		*bp++ = '\0';
		bp = buf;
		n = 3;
		while(--n)
		while((c = *bp++) != ':')
			if(c == '\n')
				return(1);
		while((c = *bp++) != ':') {
			if(c<'0' || c>'9')
				continue;
			n = n*10+c-'0';
		}
		if(n == uid)
			return(0);
	}
}