From 653a2a8b123b79835af9f684f8b92ef7f88712aa Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <dimitri@stack.nl>
Date: Sat, 19 Apr 2014 16:27:11 +0200
Subject: Bug 728530 - Crash on \addindex \term

---
 src/htmldocvisitor.cpp  | 43 +++++++++++++++++++++++--------------------
 src/latexdocvisitor.cpp | 46 ++++++++++++++++++++++++++--------------------
 2 files changed, 49 insertions(+), 40 deletions(-)

diff --git a/src/htmldocvisitor.cpp b/src/htmldocvisitor.cpp
index 9939ef2..c70f2c5 100644
--- a/src/htmldocvisitor.cpp
+++ b/src/htmldocvisitor.cpp
@@ -44,27 +44,30 @@ static QCString convertIndexWordToAnchor(const QString &word)
   QCString result;
   const char *str = word.data();
   unsigned char c;
-  while ((c = *str++)) 
-  {
-    if ((c >= 'a' && c <= 'z') || // ALPHA
-        (c >= 'A' && c <= 'A') || // ALPHA
-        (c >= '0' && c <= '9') || // DIGIT
-        c == '-' || 
-        c == '.' || 
-        c == '_' || 
-        c == '~'
-       )
-    {
-      result += c;
-    }
-    else 
+  if (str)
+  {
+    while ((c = *str++))
     {
-      char enc[4];
-      enc[0] = '%';
-      enc[1] = hex[(c & 0xf0) >> 4];
-      enc[2] = hex[c & 0xf];
-      enc[3] = 0;
-      result += enc;
+      if ((c >= 'a' && c <= 'z') || // ALPHA
+          (c >= 'A' && c <= 'A') || // ALPHA
+          (c >= '0' && c <= '9') || // DIGIT
+          c == '-' ||
+          c == '.' ||
+          c == '_' ||
+          c == '~'
+         )
+      {
+        result += c;
+      }
+      else
+      {
+        char enc[4];
+        enc[0] = '%';
+        enc[1] = hex[(c & 0xf0) >> 4];
+        enc[2] = hex[c & 0xf];
+        enc[3] = 0;
+        result += enc;
+      }
     }
   }
   return result;
diff --git a/src/latexdocvisitor.cpp b/src/latexdocvisitor.cpp
index 68f0f06..eed36bc 100644
--- a/src/latexdocvisitor.cpp
+++ b/src/latexdocvisitor.cpp
@@ -38,17 +38,20 @@ static QCString escapeLabelName(const char *s)
   QCString result;
   const char *p=s;
   char c;
-  while ((c=*p++))
+  if (p)
   {
-    switch (c)
+    while ((c=*p++))
     {
-      case '%': result+="\\%"; break;
-      case '|': result+="\\texttt{\"|}"; break;
-      case '!': result+="\"!"; break;
-      case '{': result+="\\lcurly{}"; break;
-      case '}': result+="\\rcurly{}"; break;
-      case '~': result+="````~"; break; // to get it a bit better in index together with other special characters
-      default: result+=c;
+      switch (c)
+      {
+        case '%': result+="\\%"; break;
+        case '|': result+="\\texttt{\"|}"; break;
+        case '!': result+="\"!"; break;
+        case '{': result+="\\lcurly{}"; break;
+        case '}': result+="\\rcurly{}"; break;
+        case '~': result+="````~"; break; // to get it a bit better in index together with other special characters
+        default: result+=c;
+      }
     }
   }
   return result;
@@ -73,19 +76,22 @@ QCString LatexDocVisitor::escapeMakeIndexChars(const char *s)
   const char *p=s;
   char str[2]; str[1]=0;
   char c;
-  while ((c=*p++))
+  if (p)
   {
-    switch (c)
+    while ((c=*p++))
     {
-      case '!': m_t << "\"!"; break;
-      case '"': m_t << "\"\""; break;
-      case '@': m_t << "\"@"; break;
-      case '|': m_t << "\\texttt{\"|}"; break;
-      case '[': m_t << "["; break;
-      case ']': m_t << "]"; break;
-      case '{': m_t << "\\lcurly{}"; break;
-      case '}': m_t << "\\rcurly{}"; break;
-      default:  str[0]=c; filter(str); break;
+      switch (c)
+      {
+        case '!': m_t << "\"!"; break;
+        case '"': m_t << "\"\""; break;
+        case '@': m_t << "\"@"; break;
+        case '|': m_t << "\\texttt{\"|}"; break;
+        case '[': m_t << "["; break;
+        case ']': m_t << "]"; break;
+        case '{': m_t << "\\lcurly{}"; break;
+        case '}': m_t << "\\rcurly{}"; break;
+        default:  str[0]=c; filter(str); break;
+      }
     }
   }
   return result;
-- 
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