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.

1 files 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';
 }