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Instead of doing strvis() of gecos string on output, do it when
storing them in struct person since they are only used for output.
Uses reallocarray() for overflow detection. OK deraadt@

/*	$OpenBSD: sprint.c,v 1.14 2014/10/17 20:19:15 millert Exp $	*/

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * 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/time.h>
#include <tzfile.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include "finger.h"
#include "extern.h"

void
sflag_print(void)
{
	PERSON *pn;
	WHERE *w;
	int cnt;
	char *p;
	PERSON **list;

	list = sort();
	/*
	 * short format --
	 *	login name
	 *	real name
	 *	terminal name (the XX of ttyXX)
	 *	if terminal writeable (add an '*' to the terminal name
	 *		if not)
	 *	if logged in show idle time and day logged in, else
	 *		show last login date and time.  If > 6 months,
	 *		show year instead of time.  If < 6 days,
	 *		show day name instead of month & day.
	 *	if -h given
	 *		remote host
	 *	else if -o given (overriding -h) (default)
	 *		office location
	 *		office phone
	 */
#define NAME_WIDTH	8
#define	MAXREALNAME	20
#define	MAXHOSTNAME	20
	(void)printf("%-*.*s %-*s %s %s\n",
	    NAME_WIDTH, UT_NAMESIZE, "Login", MAXREALNAME,
	    "Name", "Tty  Idle  Login Time  ",
	    (oflag) ? "Office     Office Phone" : "Where");
	for (cnt = 0; cnt < entries; ++cnt) {
		pn = list[cnt];
		for (w = pn->whead; w != NULL; w = w->next) {
			(void)printf("%-*.*s %-*.*s ",
			    NAME_WIDTH, UT_NAMESIZE, pn->name,
			    MAXREALNAME, MAXREALNAME,
			    pn->realname ? pn->realname : "");
			if (!w->loginat) {
				(void)printf("  *     *  No logins   ");
				goto office;
			}
			(void)putchar(w->info == LOGGEDIN && !w->writable ?
			    '*' : ' ');
			if (*w->tty)
				(void)printf("%-2.2s ",
				    w->tty[0] != 't' || w->tty[1] != 't' ||
				    w->tty[2] != 'y' ? w->tty : w->tty + 3);
			else
				(void)printf("   ");
			if (w->info == LOGGEDIN) {
				stimeprint(w);
				(void)printf("  ");
			} else
				(void)printf("    *  ");
			p = ctime(&w->loginat);
			if (now - w->loginat < SECSPERDAY * (DAYSPERWEEK - 1))
				(void)printf("   %.3s", p);
			else
				(void)printf("%.6s", p + 4);
			if (now - w->loginat >= SECSPERDAY * DAYSPERNYEAR / 2)
				(void)printf(" %.4s ", p + 20);
			else
				(void)printf(" %.5s", p + 11);
office:
			putchar(' ');
			if (oflag) {
				if (pn->office)
					(void)printf("%-10.10s", pn->office);
				else if (pn->officephone)
					(void)printf("%-10.10s", " ");
				if (pn->officephone)
					(void)printf(" %-.15s",
					    prphone(pn->officephone));
			} else
				(void)printf("%.*s", MAXHOSTNAME, w->host);
			putchar('\n');
		}
	}
}

PERSON **
sort(void)
{
	PERSON *pn, **lp;
	PERSON **list;

	if (!(list = (PERSON **)calloc((u_int)entries, sizeof(PERSON *))))
		err(1, "malloc");
	for (lp = list, pn = phead; pn != NULL; pn = pn->next)
		*lp++ = pn;
	(void)qsort(list, entries, sizeof(PERSON *), psort);
	return (list);
}

int
psort(const void *p, const void *t)
{
	return (strcmp((*(PERSON **)p)->name, (*(PERSON **)t)->name));
}

void
stimeprint(WHERE *w)
{
	struct tm *delta;

	delta = gmtime(&w->idletime);
	if (!delta->tm_yday) {
		if (!delta->tm_hour) {
			if (!delta->tm_min)
				(void)printf("    -");
			else
				(void)printf("%5d", delta->tm_min);
		 } else {
			(void)printf("%2d:%02d",
			    delta->tm_hour, delta->tm_min);
		 }
	} else
		(void)printf("%4dd", delta->tm_yday);
}