# HG changeset patch
# User Olaf Wintermann <olaf.wintermann@gmail.com>
# Date 1643295042 -3600
# Node ID f4eb5d125e58b8dcae6660fd6654cd9987bef249
# Parent  f210681d9dd0221db2c75dca2ab06d393b377884
add util_html_escape implementation from Open Web Server

diff -r f210681d9dd0 -r f4eb5d125e58 src/server/util/util.c
--- a/src/server/util/util.c	Thu Jan 27 15:47:18 2022 +0100
+++ b/src/server/util/util.c	Thu Jan 27 15:50:42 2022 +0100
@@ -1033,3 +1033,97 @@
 
     return pos;
 }
+
+
+/* ------------------------- util_html_escape -------------------------- */
+
+NSAPI_PUBLIC char *util_html_escape(const char *s)
+{
+    const char *in;
+
+    int len = 0;
+    for (in = s; *in; in++) {
+        switch (*in) {
+        case '<':
+            len += 4; // &lt;
+            break;
+        case '>':
+            len += 4; // &gt;
+            break;
+        case '&':
+            len += 5; // &amp;
+            break;
+        case '"':
+            len += 6; // &quot;
+            break;
+        case '\'':
+            len += 6; // &apos;
+            break;
+        case '+':
+            len += 5; // &#43;
+            break;
+        default:
+            len++;
+            break;
+        }
+    }
+
+    char *ns = (char *) MALLOC(len + 1);
+    if (!ns)
+        return ns;
+
+    char *out = ns;
+    for (in = s; *in; in++) {
+        switch (*in) {
+        case '<':
+            *out++ = '&';
+            *out++ = 'l';
+            *out++ = 't';
+            *out++ = ';';
+            break;
+        case '>':
+            *out++ = '&';
+            *out++ = 'g';
+            *out++ = 't';
+            *out++ = ';';
+            break;
+        case '&':
+            *out++ = '&';
+            *out++ = 'a';
+            *out++ = 'm';
+            *out++ = 'p';
+            *out++ = ';';
+            break;
+        case '"':
+            *out++ = '&';
+            *out++ = 'q';
+            *out++ = 'u';
+            *out++ = 'o';
+            *out++ = 't';
+            *out++ = ';';
+            break;
+        case '\'':
+            *out++ = '&';
+            *out++ = 'a';
+            *out++ = 'p';
+            *out++ = 'o';
+            *out++ = 's';
+            *out++ = ';';
+            break;
+        case '+':
+            *out++ = '&';
+            *out++ = '#';
+            *out++ = '4';
+            *out++ = '3';
+            *out++ = ';';
+            break;
+        default:
+            *out++ = *in;
+            break;
+        }
+    }
+    *out = '\0';
+
+    return ns;
+}
+