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From: Ed Schouten <ed@FreeBSD.org>
Date: Thu, 12 Feb 2009 19:32:52 +0000 (UTC)
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Subject: svn commit: r188536 - head/lib/libc/gen
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Author: ed
Date: Thu Feb 12 19:32:52 2009
New Revision: 188536
URL: http://svn.freebsd.org/changeset/base/188536

Log:
  Properly invalidate highest pts number when calling setttyent().
  
  When calling setttyent() after calling endttyent(), pts_valid will never
  be set to 1, because the readdir()-loop will likely never vind a pts
  that has a higher number than before.
  
  Simplify the code by removing pts_valid. We'll just set maxpts to -1
  when we don't have a valid count yet.

Modified:
  head/lib/libc/gen/getttyent.c

Modified: head/lib/libc/gen/getttyent.c
==============================================================================
--- head/lib/libc/gen/getttyent.c	Thu Feb 12 19:21:48 2009	(r188535)
+++ head/lib/libc/gen/getttyent.c	Thu Feb 12 19:32:52 2009	(r188536)
@@ -43,9 +43,8 @@ __FBSDID("$FreeBSD$");
 
 static char zapchar;
 static FILE *tf;
-static int maxpts = 0;
+static int maxpts = -1;
 static int curpts = 0;
-static int pts_valid = 0;
 static size_t lbsize;
 static char *line;
 
@@ -84,7 +83,7 @@ getttyent()
 		return (NULL);
 	for (;;) {
 		if (!fgets(p = line, lbsize, tf)) {
-			if (pts_valid == 1 && curpts <= maxpts) {
+			if (curpts <= maxpts) {
 				sprintf(devpts_name, "pts/%d", curpts++);
 				tty.ty_name = devpts_name;
 				tty.ty_getty = tty.ty_type = NULL;
@@ -234,12 +233,12 @@ setttyent()
 	if (devpts_dir) {
 		struct dirent *dp;
 
+		maxpts = -1;
 		while ((dp = readdir(devpts_dir))) {
 			if (strcmp(dp->d_name, ".") != 0 &&
 			    strcmp(dp->d_name, "..") != 0) {
 				if (atoi(dp->d_name) > maxpts) {
 					maxpts = atoi(dp->d_name);
-					pts_valid = 1;
 					curpts = 0;
 				}
 			}
@@ -259,7 +258,7 @@ endttyent()
 {
 	int rval;
 
-	pts_valid = 0;
+	maxpts = -1;
 	/*
          * NB: Don't free `line' because getttynam()
 	 * may still be referencing it