nobu	2016-12-14 16:30:41 +0900 (Wed, 14 Dec 2016)

  New Revision: 57075

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57075

  Log:
    parse.y: curtail scanning
    
    * parse.y (parser_yyerror): curtail scanning range, not to exceed
      the max margin.

  Modified files:
    trunk/parse.y
Index: parse.y
===================================================================
--- parse.y	(revision 57074)
+++ parse.y	(revision 57075)
@@ -5255,18 +5255,21 @@ parser_yyerror(struct parser_params *par https://github.com/ruby/ruby/blob/trunk/parse.y#L5255
     const char *p, *pe;
     const char *pre = "", *post = "";
     const char *code = "", *caret = "", *newline = "";
+    const char *lim;
     char *buf;
     long len;
     int i;
 
     p = lex_p;
-    while (lex_pbeg < p) {
+    lim = p - lex_pbeg > max_line_margin ? p - max_line_margin : lex_pbeg;
+    while (lim < p) {
 	if (*(p-1) == '\n') break;
 	p--;
     }
 
     pe = lex_p;
-    while (pe < lex_pend) {
+    lim = lex_pend - pe > max_line_margin ? pe + max_line_margin : lex_pend;
+    while (pe < lim) {
 	if (*pe == '\n') break;
 	pe++;
     }

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