From e1232831a58f1b16bdaef783b0e87ca9c749f39a Mon Sep 17 00:00:00 2001
From: robertl <robertl@f51c46e8-681c-474f-0cfe-069cfd0219fb>
Date: Tue, 23 Sep 2003 15:56:08 +0000
Subject: [PATCH] Don't run backward past beginning of all-whitespace string.

---
 gpsbabel/util.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gpsbabel/util.c b/gpsbabel/util.c
index fb5f624e1..0bd965b81 100644
--- a/gpsbabel/util.c
+++ b/gpsbabel/util.c
@@ -237,6 +237,8 @@ pstrdup(char *src)
 void 
 rtrim(char *s)
 {
+	char *t = s;
+
 	if (!s || !*s) {
 		return;
 	}
@@ -246,7 +248,7 @@ rtrim(char *s)
 	}
 
 	s--;
-	while (isspace (*s)) {
+	while ((s >= t) && isspace (*s)) {
 		*s = 0;
 		s--;
 	}
-- 
2.30.2