From e1890e3e829665a54f04284f4e23bd0fd37de06b Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Wed, 20 May 2015 18:18:33 +0300
Subject: [PATCH] Fix slash collapsing in etags on MS-Windows

* lib-src/etags.c (canonicalize_filename) [DOS_NT]: Separate the
MS-Windows code from the Posix code, and support collapsing both
forward- and back-slashes on MS-Windows.  Fixes a regression found
by the test suite.
---
 lib-src/etags.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/lib-src/etags.c b/lib-src/etags.c
index 7bacbd3e619..0a308c1984f 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -6484,7 +6484,6 @@ static void
 canonicalize_filename (register char *fn)
 {
   register char* cp;
-  char sep = '/';
 
 #ifdef DOS_NT
   /* Canonicalize drive letter case.  */
@@ -6492,19 +6491,33 @@ canonicalize_filename (register char *fn)
   if (fn[0] != '\0' && fn[1] == ':' && ISUPPER (fn[0]))
     fn[0] = lowcase (fn[0]);
 
-  sep = '\\';
-#endif
+  /* Collapse multiple forward- and back-slashes into a single forward
+     slash. */
+  for (cp = fn; *cp != '\0'; cp++, fn++)
+    if (*cp == '/' || *cp == '\\')
+      {
+	*fn = '/';
+	while (cp[1] == '/' || cp[1] == '\\')
+	  cp++;
+      }
+    else
+      *fn = *cp;
+
+#else  /* !DOS_NT */
 
-  /* Collapse multiple separators into a single slash. */
+  /* Collapse multiple slashes into a single slash. */
   for (cp = fn; *cp != '\0'; cp++, fn++)
-    if (*cp == sep)
+    if (*cp == '/')
       {
 	*fn = '/';
-	while (cp[1] == sep)
+	while (cp[1] == '/')
 	  cp++;
       }
     else
       *fn = *cp;
+
+#endif	/* !DOS_NT */
+
   *fn = '\0';
 }
 
-- 
2.39.2