nobu	2017-06-06 21:30:17 +0900 (Tue, 06 Jun 2017)

  New Revision: 59027

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59027

  Log:
    debug.c: fix breaking condtions

  Modified files:
    trunk/debug.c
Index: debug.c
===================================================================
--- debug.c	(revision 59026)
+++ debug.c	(revision 59027)
@@ -154,10 +154,9 @@ set_debug_option(const char *str, int le https://github.com/ruby/ruby/blob/trunk/debug.c#L154
 	    if (!ov && retlen) {
 		ruby_w32_codepage[i] = (UINT)n;
 	    }
-	    if ((size_t)len <= retlen) break;
 	    str += retlen;
 	    len -= retlen;
-	    if (*str != ':') break;
+	    if (!len || *str != ':') break;
 	    ++str;
 	    --len;
 	}

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