Let wall(1) use utmpx.

Because our implementation guarantees the strings inside struct utmpx to
be null terminated, we don't need to copy everything out, which makes
the code nicer to read.

Also set WARNS to 6 and add $FreeBSD$ to keep SVN silent.

2 files changed, 17 insertions, 18 deletions

diff --git a/usr.bin/wall/Makefile b/usr.bin/wall/Makefile
index 65abb61184c7..5e75d9b96f45 100644
--- a/usr.bin/wall/Makefile
+++ b/usr.bin/wall/Makefile
@@ -1,8 +1,14 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
+# $FreeBSD$
 
 PROG=	wall
 SRCS=	ttymsg.c wall.c
 BINGRP=	tty
 BINMODE=2555
 
+WARNS?=	6
+
+DPADD=	${LIBULOG}
+LDADD=	-lulog
+
 .include <bsd.prog.mk>
diff --git a/usr.bin/wall/wall.c b/usr.bin/wall/wall.c
index be5329aca566..dc631167108b 100644
--- a/usr.bin/wall/wall.c
+++ b/usr.bin/wall/wall.c
@@ -64,8 +64,9 @@ static const char sccsid[] = "@(#)wall.c	8.2 (Berkeley) 11/16/93";
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#define	_ULOG_POSIX_NAMES
+#include <ulog.h>
 #include <unistd.h>
-#include <utmp.h>
 
 #include "ttymsg.h"
 
@@ -82,12 +83,12 @@ int mbufsize;
 char *mbuf;
 
 static int
-ttystat(char *line, int sz)
+ttystat(char *line)
 {
 	struct stat sb;
 	char ttybuf[MAXPATHLEN];
 
-	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
+	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
 	if (stat(ttybuf, &sb) == 0) {
 		return (0);
 	} else
@@ -98,17 +99,14 @@ int
 main(int argc, char *argv[])
 {
 	struct iovec iov;
-	struct utmp utmp;
+	struct utmpx *utmp;
 	int ch;
 	int ingroup;
-	FILE *fp;
 	struct wallgroup *g;
 	struct group *grp;
 	char **np;
 	const char *p;
 	struct passwd *pw;
-	char line[sizeof(utmp.ut_line) + 1];
-	char username[sizeof(utmp.ut_name) + 1];
 
 	(void)setlocale(LC_CTYPE, "");
 
@@ -145,20 +143,17 @@ main(int argc, char *argv[])
 
 	makemsg(*argv);
 
-	if (!(fp = fopen(_PATH_UTMP, "r")))
-		err(1, "cannot read %s", _PATH_UTMP);
 	iov.iov_base = mbuf;
 	iov.iov_len = mbufsize;
 	/* NOSTRICT */
-	while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
-		if (!utmp.ut_name[0])
+	while ((utmp = getutxent()) != NULL) {
+		if (utmp->ut_type != USER_PROCESS)
 			continue;
-		if (ttystat(utmp.ut_line, UT_LINESIZE) != 0)
+		if (ttystat(utmp->ut_line) != 0)
 			continue;
 		if (grouplist) {
 			ingroup = 0;
-			strlcpy(username, utmp.ut_name, sizeof(utmp.ut_name));
-			pw = getpwnam(username);
+			pw = getpwnam(utmp->ut_user);
 			if (!pw)
 				continue;
 			for (g = grouplist; g && ingroup == 0; g = g->next) {
@@ -168,7 +163,7 @@ main(int argc, char *argv[])
 					ingroup = 1;
 				else if ((grp = getgrgid(g->gid)) != NULL) {
 					for (np = grp->gr_mem; *np; np++) {
-						if (strcmp(*np, username) == 0) {
+						if (strcmp(*np, utmp->ut_user) == 0) {
 							ingroup = 1;
 							break;
 						}
@@ -178,9 +173,7 @@ main(int argc, char *argv[])
 			if (ingroup == 0)
 				continue;
 		}
-		strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
-		line[sizeof(utmp.ut_line)] = '\0';
-		if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
+		if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL)
 			warnx("%s", p);
 	}
 	exit(0);