From 7c2575d72352405c858ecec1618c60cdd98dd1d6 Mon Sep 17 00:00:00 2001
From: andy <andy>
Date: Thu, 21 Jul 2005 23:03:26 +0000
Subject: [PATCH] Josh discovered a bug parsing negative numbers with leading
 zeros ("-0.3") which also affected ones of the form "-.3".  This got
 introduced a few months back, I'm not sure how it went undetected for so
 long...

---
 simgear/nasal/string.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/simgear/nasal/string.c b/simgear/nasal/string.c
index a94468c6..8a96ba97 100644
--- a/simgear/nasal/string.c
+++ b/simgear/nasal/string.c
@@ -175,6 +175,13 @@ static int tonum(unsigned char* s, int len, double* result)
     if(len == 1 && s[0] == '.')
         return 0;
 
+    // Strip off the leading negative sign first, so we can correctly
+    // parse things like -.xxx which would otherwise confuse
+    // readsigned.
+    if(len > 1 && s[0] == '-' && s[1] != '-') {
+        sgn = -1; s++; len--;
+    }
+
     // Read the integer part
     i = readsigned(s, len, i, &val);
     if(val < 0) { sgn = -1; val = -val; }
-- 
2.39.5