* path.cc (path_conv::check): Set case_clash even if pcheck_case

        is set to PCHECK_ADJUST when a case clash is given for the last
        component in path.
        (symlink_info::case_check): Ditto.
        * syscalls.cc (_rename): Avoid overwriting an already existing file
        if a case clash is given even if pcheck_case is set to PCHECK_ADJUST.

2 files changed, 18 insertions, 10 deletions

diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index 02641f3..fe91bff 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -324,9 +324,18 @@ path_conv::check (const char *src, unsigned opt,
 
 	  if (sym.case_clash)
 	    {
-	      case_clash = TRUE;
-	      error = ENOENT;
-	      goto out;
+	      if (pcheck_case == PCHECK_STRICT)
+	        {
+		  case_clash = TRUE;
+		  error = ENOENT;
+		  goto out;
+		}
+	      /* If pcheck_case==PCHECK_ADJUST the case_clash is remembered
+	         if the last component is concerned. This allows functions
+		 which shall create files to avoid overriding already existing
+		 files with another case. */
+	      if (!component)
+	        case_clash = TRUE;
 	    }
 
 	  if (!(opt & PC_SYM_IGNORE))
@@ -2754,13 +2763,12 @@ symlink_info::case_check (const char *path, char *orig_path)
       /* If that part of the component exists, check the case. */
       if (strcmp (c, data.cFileName))
 	{
+	  case_clash = TRUE;
+
 	  /* If check is set to STRICT, a wrong case results
 	     in returning a ENOENT. */
 	  if (pcheck_case == PCHECK_STRICT)
-	    {
-	      case_clash = TRUE;
-	      return FALSE;
-	    }
+	    return FALSE;
 
 	  /* PCHECK_ADJUST adjusts the case in the incoming
 	     path which points to the path in *this. */
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 933baaf..5a9b24c 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1246,7 +1246,7 @@ _rename (const char *oldpath, const char *newpath)
 
   /* Shortcut hack. */
   char new_lnk_buf[MAX_PATH + 5];
-  if (real_old.issymlink () && !real_new.error)
+  if (real_old.issymlink () && !real_new.error && !real_new.case_clash)
     {
       int len_old = strlen (real_old.get_win32 ());
       if (strcasematch (real_old.get_win32 () + len_old - 4, ".lnk"))
@@ -1258,10 +1258,10 @@ _rename (const char *oldpath, const char *newpath)
 	}
     }
 
-  if (real_new.error)
+  if (real_new.error || real_new.case_clash)
     {
       syscall_printf ("-1 = rename (%s, %s)", oldpath, newpath);
-      set_errno (real_new.error);
+      set_errno (real_new.case_clash ? ECASECLASH : real_new.error);
       return -1;
     }