From 00d13178df1b85d621f1789a50feb89e06217143 Mon Sep 17 00:00:00 2001
From: dweller <dweller@cabin.digital>
Date: Tue, 12 Mar 2024 01:36:42 +0200
Subject: if using older PHP version (like 7), the default flags for
 htmlspecialchars() are suboptimal, _sigh_

---
 common.php |  1 +
 index.php  |  4 ++--
 search.php | 10 +++++-----
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/common.php b/common.php
index 82c59a6..5f7c05a 100644
--- a/common.php
+++ b/common.php
@@ -20,6 +20,7 @@
     $section = trim($_GET['section'] ?? null);
     $arch    = trim($_GET['arch']    ?? null);
 
+    $hsc_flags = ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401;
 
     /*
     function dbg_print($data)
diff --git a/index.php b/index.php
index 951be29..229cce2 100644
--- a/index.php
+++ b/index.php
@@ -54,7 +54,7 @@
                 <form action="/search.php">
                     <div id="query_wrap">
                         <div    id="query_icon"></div>
-                        <input  id="query"   type='search' value='<?php if($action === 'lmmtfy') echo htmlspecialchars($query);?>' name='query' autocorrect="off" autocapitalize="none" required autofocus/>
+                        <input  id="query"   type='search' value='<?php if($action === 'lmmtfy') echo htmlspecialchars($query, $hsc_flags);?>' name='query' autocorrect="off" autocapitalize="none" required autofocus/>
                         <button id="btn_def" type='submit' value='man' name='action' class="btn-def" aria-hidden="true" tabindex="-1"></button>
                         <input type="checkbox" id="query_opts_toggle"/>
                         <div id="query_opts">
@@ -81,7 +81,7 @@
                                         if((strlen($arch) > 0) && ($arch == $a))
                                             $sel = 'selected="selected"';
 
-                                        $a = htmlspecialchars($a);
+                                        $a = htmlspecialchars($a, $hsc_flags);
                                         echo "<option value='$a' $sel>$a</option>";
                                     }
                                 ?>
diff --git a/search.php b/search.php
index e61da1b..522eeaf 100644
--- a/search.php
+++ b/search.php
@@ -48,7 +48,7 @@
                 <nav id="search_pane">
                     <form>
                         <div id="query_wrap">
-                            <input  id="query"   type='search' value='<?= htmlspecialchars($query);?>' name='query' autocorrect="off" autocapitalize="none" required/>
+                            <input  id="query"   type='search' value='<?= htmlspecialchars($query, $hsc_flags);?>' name='query' autocorrect="off" autocapitalize="none" required/>
                             <button id="btn_def" type='submit' value='man' name='action' class="btn-def" aria-hidden="true" tabindex="-1"></button>
                             <input type="checkbox" id="query_opts_toggle"/>
                             <div id="query_opts">
@@ -75,7 +75,7 @@
                                             if((strlen($arch) > 0) && ($arch == $a))
                                                 $sel = 'selected="selected"';
 
-                                            $a = htmlspecialchars($a);
+                                            $a = htmlspecialchars($a, $hsc_flags);
                                             echo "<option value='$a' $sel>$a</option>";
                                         }
                                     ?>
@@ -182,9 +182,9 @@
                     $url = "$root/search.php?query=". urlencode($name) ."&section=". urlencode($sect)
                            ."&arch=". urlencode($arch) ."&action=man";
 
-                    $fname = htmlspecialchars($fname);
-                    $fsect = htmlspecialchars($fsect);
-                    $desc  = htmlspecialchars($desc);
+                    $fname = htmlspecialchars($fname, $hsc_flags);
+                    $fsect = htmlspecialchars($fsect, $hsc_flags);
+                    $desc  = htmlspecialchars($desc,  $hsc_flags);
 
                     echo '<dl>';
                     echo "  <dt><a href='".$url."'>$fname($fsect)</a></dt>";
-- 
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