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diff libinterp/parse-tree/lex.ll @ 17244:9de751a10910

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Add support for hexadecimal escape sequences in double-quoted strings (bug #39775) * lex.ll (<DQ_STRING_START>\\x[0-9a-fA-F]+): New pattern to parse hex escape sequences in double-quoted strings. * strings.txi: Uncomment and clean up the descriptions of octal and hex escape sequences.
author Mike Miller <mtmiller@ieee.org>
date Wed, 14 Aug 2013 02:07:07 -0400
parents bc12849bb6cc
children 8be8a65d3ca8
line wrap: on
line diff
--- a/libinterp/parse-tree/lex.ll
+++ b/libinterp/parse-tree/lex.ll
@@ -694,6 +694,21 @@
       curr_lexer->string_text += static_cast<unsigned char> (result);
   }
 
+<DQ_STRING_START>\\x[0-9a-fA-F]+ {
+    curr_lexer->lexer_debug ("<DQ_STRING_START>\\\\x[0-9a-fA-F]+");
+
+    curr_lexer->current_input_column += yyleng;
+
+    int result;
+    sscanf (yytext+2, "%x", &result);
+
+    // Truncate the value silently instead of checking the range like
+    // we do for octal above.  This is to match C/C++ where any number
+    // of digits is allowed but the value is implementation-defined if
+    // it exceeds the range of the character type.
+    curr_lexer->string_text += static_cast<unsigned char> (result);
+  }
+
 <DQ_STRING_START>"\\a" {
     curr_lexer->lexer_debug ("<DQ_STRING_START>\"\\\\a\"");