1 files changed, 89 insertions, 0 deletions
diff --git a/tests/lineno_trailing.l b/tests/lineno_trailing.l
new file mode 100644
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+++ b/tests/lineno_trailing.l
@@ -0,0 +1,89 @@
+/*
+ * This file is part of flex.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+%{
+/* A template scanner file to build "scanner.c".
+   Run as:
+          test-lineno-trailing    # report flex's yylineno
+          test-lineno-trailing 1  # report count_newlines(stdin)
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "config.h"
+
+%}
+
+%option 8bit prefix="test"
+%option nounput nomain noyywrap noinput yylineno
+%option warn
+
+WORD [[:alpha:]]+
+
+%%
+    /* The goal here is to test the yylineno in the context of trailing-contexts.
+       Using rules that have newlines in look-ahead.
+    */
+"Fixed_trailing:"/[\n]"test"[\n] {}
+"Var_trailing:"{WORD}/[\n] {}
+"Var_prefix_and_trailing:"{WORD}":"/(\n{WORD})* {}
+\n                     {}
+.                      {}
+<<EOF>>  { printf("%d\n", yylineno);
+           yyterminate();
+         }
+
+%%
+
+/* returns number of '\n' characters in input, plus one.
+   This is what flex does, essentially. */
+   
+static int
+count_newlines (FILE* in)
+{
+    int n=1,c;
+    while ((c=fgetc(in)) != EOF)
+        if( c == '\n')
+            n++;
+    return n;
+}
+
+int main ( int, char**);
+
+int
+main ( argc,  argv )
+    int argc;
+    char** argv;
+{
+    (void)argv;
+
+    if( argc > 1 )
+        printf("%d\n", count_newlines(stdin));
+
+    else{
+        yyin = stdin;
+        yyout = stdout;
+        yylex();
+    }
+    return 0;
+}