3 files changed, 6 insertions, 6 deletions

diff --git a/usr.sbin/config/mkmakefile.c b/usr.sbin/config/mkmakefile.c
index 4cbc1356f83ac..937fb0f96e978 100644
--- a/usr.sbin/config/mkmakefile.c
+++ b/usr.sbin/config/mkmakefile.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1993, 19801990
+ * Copyright (c) 1980, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -154,7 +154,7 @@ makefile(void)
 		fprintf(ofp, "PROFLEVEL=%d\n", profiling);
 	if (*srcdir != '\0')
 		fprintf(ofp,"S=%s\n", srcdir);
-	while (fgets(line, BUFSIZ, ifp) != 0) {
+	while (fgets(line, BUFSIZ, ifp) != NULL) {
 		if (*line != '%') {
 			fprintf(ofp, "%s", line);
 			continue;
@@ -204,7 +204,7 @@ makehints(void)
 		ifp = fopen(hint->hint_name, "r");
 		if (ifp == NULL)
 			err(1, "%s", hint->hint_name);
-		while (fgets(line, BUFSIZ, ifp) != 0) {
+		while (fgets(line, BUFSIZ, ifp) != NULL) {
 			/* zap trailing CR and/or LF */
 			while ((s = strrchr(line, '\n')) != NULL)
 				*s = '\0';
@@ -266,7 +266,7 @@ makeenv(void)
 	fprintf(ofp, "int envmode = %d;\n", envmode);
 	fprintf(ofp, "char static_env[] = {\n");
 	if (ifp) {
-		while (fgets(line, BUFSIZ, ifp) != 0) {
+		while (fgets(line, BUFSIZ, ifp) != NULL) {
 			/* zap trailing CR and/or LF */
 			while ((s = strrchr(line, '\n')) != NULL)
 				*s = '\0';
diff --git a/usr.sbin/lpr/lpc/lpc.c b/usr.sbin/lpr/lpc/lpc.c
index bd95c59591dda..f9fb920dd5407 100644
--- a/usr.sbin/lpr/lpc/lpc.c
+++ b/usr.sbin/lpr/lpc/lpc.c
@@ -188,7 +188,7 @@ cmdscanner(void)
 			history(hist, &he, H_ENTER, bp);
 
 		} else {
-			if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
+			if (fgets(cmdline, MAX_CMDLINE, stdin) == NULL)
 				quit(0, NULL);
 			if (cmdline[0] == 0 || cmdline[0] == '\n')
 				break;
diff --git a/usr.sbin/timed/timedc/timedc.c b/usr.sbin/timed/timedc/timedc.c
index 5423ceaadef6b..7047f57ec46a4 100644
--- a/usr.sbin/timed/timedc/timedc.c
+++ b/usr.sbin/timed/timedc/timedc.c
@@ -105,7 +105,7 @@ main(argc, argv)
 			printf("timedc> ");
 			(void) fflush(stdout);
 		}
-		if (fgets(cmdline, sizeof(cmdline), stdin) == 0)
+		if (fgets(cmdline, sizeof(cmdline), stdin) == NULL)
 			quit();
 		if (cmdline[0] == 0)
 			break;