From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 31 May 2017 23:50:08 +0000 (-0700)
Subject: Fix bug with "%%" in error format
X-Git-Tag: emacs-26.0.90~521^2~208
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=32fd8768093e21f1e812548d27c0bfd70cd82f78;p=emacs.git

Fix bug with "%%" in error format

* src/doprnt.c (doprnt): Format "%%" correctly.
Problem reported by Philipp Stephani in:
http://lists.gnu.org/archive/html/emacs-devel/2017-05/msg00901.html
---

diff --git a/src/doprnt.c b/src/doprnt.c
index bed9350f4a6..418601acb02 100644
--- a/src/doprnt.c
+++ b/src/doprnt.c
@@ -438,7 +438,9 @@ doprnt (char *buffer, ptrdiff_t bufsize, const char *format,
 	      }
 
 	    case '%':
-	      fmt--;    /* Drop thru and this % will be treated as normal */
+	      /* Treat this '%' as normal.  */
+	      fmt0 = fmt - 1;
+	      break;
 	    }
 	}