diff -urN liblouis-2.6.2.new/liblouis/compileTranslationTable.c liblouis-2.6.2/liblouis/compileTranslationTable.c
--- liblouis-2.6.2.new/liblouis/compileTranslationTable.c	2020-02-25 09:58:32.322000000 +0000
+++ liblouis-2.6.2/liblouis/compileTranslationTable.c	2020-03-02 09:20:23.017000000 +0000
@@ -1517,9 +1517,10 @@
 		}
 	      in++;
 	    }
-	  if (out >= MAXSTRING)
+	  if (out >= MAXSTRING - 1)
 	    {
-	      result->length = out;
+	      compileError(nested, "Token too long");
+	      result->length = MAXSTRING - 1;
 	      return 1;
 	    }
 	  result->chars[out++] = (widechar) ch;
@@ -1533,15 +1534,16 @@
       utf32 = ch & (0XFF - first0Bit[numBytes]);
       for (k = 0; k < numBytes; k++)
 	{
-	  if (in >= MAXSTRING)
+	  if (in >= MAXSTRING - 1)
 	    break;
 	  if (token->chars[in] < 128 || (token->chars[in] & 0x0040))
 	    {
 	      compileWarning (nested, "invalid UTF-8. Assuming Latin-1.");
 	      result->chars[out++] = token->chars[lastIn];
-              if (out >= MAXSTRING)
+              if (out >= MAXSTRING - 1)
                 {
-                  result->length = out;
+                  compileError(nested, "Token too long");
+                  result->length = lastOutSize;
                   return 1;
                 }
 	      in = lastIn + 1;
@@ -1552,8 +1554,9 @@
       if (CHARSIZE == 2 && utf32 > 0xffff)
 	utf32 = 0xffff;
       result->chars[out++] = (widechar) utf32;
-      if (out >= MAXSTRING)
+      if (out >= MAXSTRING - 1)
 	{
+	  compileError(nested, "Token too long");
 	  result->length = lastOutSize;
 	  return 1;
 	}
@@ -1823,6 +1826,7 @@
       if (!(ch->attributes & CTC_Letter))
 	{
 	  compileError (nested, "a name may contain only letters");
+	  free(nameRule);
 	  return 0;
 	}
       nameRule->name[k] = name->chars[k];
@@ -2856,7 +2860,7 @@
       passLinepos = 0;
       while (passLinepos <= endTest)
 	{
-        if (passIC >= MAXSTRING) {
+        if (passIC >= MAXSTRING - 5) {
           compileError(passNested, "Test part in multipass operand too long");
           return 0;
 	  }
@@ -3055,7 +3059,7 @@
       while (passLinepos < passLine.length &&
 	     passLine.chars[passLinepos] > 32)
 	{
-        if (passIC >= MAXSTRING) {
+        if (passIC >= MAXSTRING - 2) {
           compileError(passNested, "Action part in multipass operand too long");
           return 0;
           }
@@ -4229,7 +4233,7 @@
 	      if (ruleDots.chars[0] == '#')
 		ruleDots.length = ruleDots.chars[0] = 0;
 	      else if (ruleDots.chars[0] == '\\' && ruleDots.chars[1] == '#')
-		memcpy (&ruleDots.chars[0], &ruleDots.chars[1],
+		memmove (&ruleDots.chars[0], &ruleDots.chars[1],
 			ruleDots.length-- * CHARSIZE);
 	    }
 	}