From e89891fa5e27a1a6f895f45d324f2b407c41539b Mon Sep 17 00:00:00 2001
From: Andrew Aitchison <exim@aitchison.me.uk>
Date: Wed, 4 Sep 2024 21:37:57 +0100
Subject: [PATCH] Debug: fix coding for signedness

Broken-by: 2d75f09c2df0
---
 src/src/string.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/src/string.c b/src/src/string.c
index f652b3815..2b62233d8 100644
--- a/src/src/string.c
+++ b/src/src/string.c
@@ -1687,11 +1687,14 @@ while (*fp)
 	    case '{' : zg = string_catn(zg, US"{BO}", 4); break;
 	    case '}' : zg = string_catn(zg, US"{BC}", 4); break;
 	    default:
-	      if ( (*s < 32) || (*s > 127) )
-		zg = string_fmt_append(zg, "{%02x}", *s);
+	      {
+	      unsigned char u = *s;
+	      if ( (u < 32) || (u > 127) )
+		zg = string_fmt_append(zg, "{%02x}", u);
 	      else
 		zg = string_catn(zg, US s, 1);
 	      break;
+	      }
 	    }
 	if (zg) { s = CS zg->s; precision = slen = gstring_length(zg); }
 	else    { s = "";	slen = 0; }
-- 
2.30.2