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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: util.c,v 1.23 2009/10/27 23:59:38 deraadt Exp $	*/

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 * Portions Copyright (c) 1983, 1995, 1996 Eric P. Allman (woof!)
 *
 * This code is derived from software contributed to Berkeley by
 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/uio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <paths.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <vis.h>
#include <err.h>
#include "finger.h"
#include "extern.h"

char	*estrdup(char *);
WHERE	*walloc(PERSON *pn);
void	find_idle_and_ttywrite(WHERE *);
void	userinfo(PERSON *, struct passwd *);

struct storage {
	struct storage *next;
	char a[1];
};

void
free_storage(struct storage *st)
{
	struct storage *nx;

	while (st != NULL) {
		nx = st->next;
		free(st);
		st = nx;
	}
}

void
find_idle_and_ttywrite(WHERE *w)
{
	struct stat sb;

	(void)snprintf(tbuf, sizeof(tbuf), "%s%s", _PATH_DEV, w->tty);
	if (stat(tbuf, &sb) < 0) {
		/* Don't bitch about it, just handle it... */
		w->idletime = 0;
		w->writable = 0;

		return;
	}
	w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;

#define	TALKABLE	0220		/* tty is writable if 220 mode */
	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
}

char *
estrdup(char *s)
{
	char *p = strdup(s);
	if (!p)
		err(1, "strdup");
	return (p);
}

void
userinfo(PERSON *pn, struct passwd *pw)
{
	char *p;
	char *bp, name[1024];
	struct stat sb;

	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;

	pn->uid = pw->pw_uid;
	pn->name = estrdup(pw->pw_name);
	pn->dir = estrdup(pw->pw_dir);
	pn->shell = estrdup(pw->pw_shell);

	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));

	/* ampersands get replaced by the login name */
	if (!(p = strsep(&bp, ",")))
		return;
	expandusername(p, pw->pw_name, name, sizeof(name));
	pn->realname = estrdup(name);
	pn->office = ((p = strsep(&bp, ",")) && *p) ?
	    estrdup(p) : NULL;
	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
	    estrdup(p) : NULL;
	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
	    estrdup(p) : NULL;
	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILSPOOL,
	    pw->pw_name);
	pn->mailrecv = -1;		/* -1 == not_valid */
	if (stat(tbuf, &sb) < 0) {
		if (errno != ENOENT) {
			warn("%s", tbuf);
			return;
		}
	} else if (sb.st_size != 0) {
		pn->mailrecv = sb.st_mtime;
		pn->mailread = sb.st_atime;
	}
}

int
match(struct passwd *pw, char *user)
{
	char *p, *t;
	char name[1024];

	(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));

	/* ampersands get replaced by the login name */
	if (!(p = strtok(p, ",")))
		return (0);
	expandusername(p, pw->pw_name, name, sizeof(name));
	for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
		if (!strcasecmp(p, user))
			return (1);
	return (0);
}

/* inspired by usr.sbin/sendmail/util.c::buildfname */
void
expandusername(char *gecos, char *login, char *buf, int buflen)
{
	char *p, *bp;

	/* why do we skip asterisks!?!? */
	if (*gecos == '*')
		gecos++;
	bp = buf;

	/* copy gecos, interpolating & to be full name */
	for (p = gecos; *p != '\0'; p++) {
		if (bp >= &buf[buflen - 1]) {
			/* buffer overflow - just use login name */
			strlcpy(buf, login, buflen);
			buf[buflen - 1] = '\0';
			return;
		}
		if (*p == '&') {
			/* interpolate full name */
			strlcpy(bp, login, buflen - (bp - buf));
			*bp = toupper(*bp);
			bp += strlen(bp);
		}
		else
			*bp++ = *p;
	}
	*bp = '\0';
}

void
enter_lastlog(PERSON *pn)
{
	WHERE *w;
	static int opened, fd;
	struct lastlog ll;
	char doit = 0;

	/* some systems may not maintain lastlog, don't report errors. */
	if (!opened) {
		fd = open(_PATH_LASTLOG, O_RDONLY);
		opened = 1;
	}
	if (fd == -1 ||
	    lseek(fd, (off_t)(pn->uid * sizeof(ll)), SEEK_SET) !=
	    (long)(pn->uid * sizeof(ll)) ||
	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
			/* as if never logged in */
			ll.ll_line[0] = ll.ll_host[0] = '\0';
			ll.ll_time = 0;
		}
	if ((w = pn->whead) == NULL)
		doit = 1;
	else if (ll.ll_time != 0) {
		/* if last login is earlier than some current login */
		for (; !doit && w != NULL; w = w->next)
			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
				doit = 1;
		/*
		 * and if it's not any of the current logins
		 * can't use time comparison because there may be a small
		 * discrepency since login calls time() twice
		 */
		for (w = pn->whead; doit && w != NULL; w = w->next)
			if (w->info == LOGGEDIN &&
			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
				doit = 0;
	}
	if (doit) {
		w = walloc(pn);
		w->info = LASTLOG;
		bcopy(ll.ll_line, w->tty, UT_LINESIZE);
		w->tty[UT_LINESIZE] = 0;
		bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
		w->host[UT_HOSTSIZE] = 0;
		w->loginat = ll.ll_time;
	}
}

void
enter_where(struct utmp *ut, PERSON *pn)
{
	WHERE *w = walloc(pn);

	w->info = LOGGEDIN;
	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
	w->tty[UT_LINESIZE] = 0;
	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
	w->host[UT_HOSTSIZE] = 0;
	w->loginat = (time_t)ut->ut_time;
	find_idle_and_ttywrite(w);
}

PERSON *
enter_person(struct passwd *pw)
{
	PERSON *pn, **pp;

	for (pp = htab + hash(pw->pw_name);
	    *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0;
	    pp = &(*pp)->hlink)
		;
	if ((pn = *pp) == NULL) {
		pn = palloc();
		entries++;
		if (phead == NULL)
			phead = ptail = pn;
		else {
			ptail->next = pn;
			ptail = pn;
		}
		pn->next = NULL;
		pn->hlink = NULL;
		*pp = pn;
		userinfo(pn, pw);
		pn->whead = NULL;
	}
	return (pn);
}

PERSON *
find_person(char *name)
{
	PERSON *pn;

	/* name may be only UT_NAMESIZE long and not terminated */
	for (pn = htab[hash(name)];
	    pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0;
	    pn = pn->hlink)
		;
	return (pn);
}

int
hash(char *name)
{
	int h, i;

	h = 0;
	/* name may be only UT_NAMESIZE long and not terminated */
	for (i = UT_NAMESIZE; --i >= 0 && *name;)
		h = ((h << 2 | h >> (HBITS - 2)) ^ *name++) & HMASK;
	return (h);
}

PERSON *
palloc(void)
{
	PERSON *p;

	if ((p = (PERSON *)malloc((u_int) sizeof(PERSON))) == NULL)
		err(1, "malloc");
	return (p);
}

WHERE *
walloc(PERSON *pn)
{
	WHERE *w;

	if ((w = (WHERE *)malloc((u_int) sizeof(WHERE))) == NULL)
		err(1, "malloc");
	if (pn->whead == NULL)
		pn->whead = pn->wtail = w;
	else {
		pn->wtail->next = w;
		pn->wtail = w;
	}
	w->next = NULL;
	return (w);
}

char *
prphone(char *num)
{
	char *p;
	int len;
	static char pbuf[15];

	/* don't touch anything if the user has their own formatting */
	for (p = num; *p; ++p)
		if (!isdigit(*p))
			return (num);
	len = p - num;
	p = pbuf;
	switch (len) {
	case 11:			/* +0-123-456-7890 */
		*p++ = '+';
		*p++ = *num++;
		*p++ = '-';
		/* FALLTHROUGH */
	case 10:			/* 012-345-6789 */
		*p++ = *num++;
		*p++ = *num++;
		*p++ = *num++;
		*p++ = '-';
		/* FALLTHROUGH */
	case 7:				/* 012-3456 */
		*p++ = *num++;
		*p++ = *num++;
		*p++ = *num++;
		break;
	case 5:				/* x0-1234 */
	case 4:				/* x1234 */
		*p++ = 'x';
		*p++ = *num++;
		break;
	default:
		return (num);
	}
	if (len != 4) {
		*p++ = '-';
		*p++ = *num++;
	}
	*p++ = *num++;
	*p++ = *num++;
	*p++ = *num++;
	*p = '\0';
	return (pbuf);
}

/* Like strvis(), but use malloc() to get the space and return a pointer
 * to the beginning of the converted string, not the end.
 *
 * The caller is responsible for free()'ing the returned string.
 */
char *
vs(struct storage **exist, char *src)
{
	char *dst;
	struct storage *n;

	if ((n = malloc(sizeof(struct storage) + 4 * strlen(src))) == NULL)
		err(1, "malloc failed");
	n->next = *exist;
	*exist = n;

	dst = n->a;

	strvis(dst, src, VIS_SAFE|VIS_NOSLASH);
	return (dst);
}