From 1ec8d4b6cf15c8a14e8cc33834b9164c85cd79d7 Mon Sep 17 00:00:00 2001
From: Jason C <jason.cipriani@gmail.com>
Date: Tue, 4 May 2021 17:22:44 -0400
Subject: [PATCH] [draco] Make sure ctype calls use unsigned char.

Addresses https://github.com/assimp/assimp/issues/3867 and then some.
---
 contrib/draco/src/draco/io/parser_utils.cc | 2 +-
 contrib/draco/src/draco/io/ply_reader.cc   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/contrib/draco/src/draco/io/parser_utils.cc b/contrib/draco/src/draco/io/parser_utils.cc
index 753a1b314..4f95f6f84 100644
--- a/contrib/draco/src/draco/io/parser_utils.cc
+++ b/contrib/draco/src/draco/io/parser_utils.cc
@@ -252,7 +252,7 @@ DecoderBuffer ParseLineIntoDecoderBuffer(DecoderBuffer *buffer) {
 
 std::string ToLower(const std::string &str) {
   std::string out;
-  std::transform(str.begin(), str.end(), std::back_inserter(out), tolower);
+  std::transform(str.begin(), str.end(), std::back_inserter(out), [](unsigned char c){return tolower(c);});
   return out;
 }
 
diff --git a/contrib/draco/src/draco/io/ply_reader.cc b/contrib/draco/src/draco/io/ply_reader.cc
index ea7f2689a..cb32df225 100644
--- a/contrib/draco/src/draco/io/ply_reader.cc
+++ b/contrib/draco/src/draco/io/ply_reader.cc
@@ -268,14 +268,14 @@ std::vector<std::string> PlyReader::SplitWords(const std::string &line) {
   while ((end = line.find_first_of(" \t\n\v\f\r", start)) !=
          std::string::npos) {
     const std::string word(line.substr(start, end - start));
-    if (!std::all_of(word.begin(), word.end(), isspace)) {
+    if (!std::all_of(word.begin(), word.end(), [](unsigned char c){return isspace(c);})) {
       output.push_back(word);
     }
     start = end + 1;
   }
 
   const std::string last_word(line.substr(start));
-  if (!std::all_of(last_word.begin(), last_word.end(), isspace)) {
+  if (!std::all_of(last_word.begin(), last_word.end(), [](unsigned char c){return isspace(c);})) {
     output.push_back(last_word);
   }
   return output;