From 5e7874015ef5ed8b2705eb2f7b0960f56f7760ea Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 10 Sep 2024 17:12:25 +0200
Subject: [PATCH] save: Make xmlEscapeTab signed

Fixes issues in platforms where char is unsigned.

Fixes #797.
---
 xmlsave.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xmlsave.c b/xmlsave.c
index 24b279c9..d0492ee4 100644
--- a/xmlsave.c
+++ b/xmlsave.c
@@ -128,7 +128,7 @@ static const char xmlEscapeContent[] = {
     ';',
 };
 
-static const char xmlEscapeTab[128] = {
+static const signed char xmlEscapeTab[128] = {
      0,  0,  0,  0,  0,  0,  0,  0,  0, -1, -1,  0,  0, 20,  0,  0,
      0,  0,  0,  0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
     -1, -1, -1, -1, -1, -1, 33, -1, -1, -1, -1, -1, -1, -1, -1, -1,
@@ -139,7 +139,7 @@ static const char xmlEscapeTab[128] = {
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 };
 
-static const char xmlEscapeTabAttr[128] = {
+static const signed char xmlEscapeTabAttr[128] = {
      0,  0,  0,  0,  0,  0,  0,  0,  0,  9, 14,  0,  0, 20,  0,  0,
      0,  0,  0,  0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
     -1, -1, 26, -1, -1, -1, 33, -1, -1, -1, -1, -1, -1, -1, -1, -1,
@@ -154,7 +154,7 @@ static void
 xmlSerializeText(xmlOutputBufferPtr buf, const xmlChar *string,
                  unsigned flags) {
     const char *cur;
-    const char *tab;
+    const signed char *tab;
 
     if (string == NULL)
         return;