maint: tac: prefer "failed to" diagnostic over "cannot"

* src/tac.c: Change wording in diagnostic: "failed to open" seems
clearer than "cannot open".

2 files changed, 6 insertions, 4 deletions

diff --git a/src/tac.c b/src/tac.c
index 7cc562e91..01150a3e8 100644
--- a/src/tac.c
+++ b/src/tac.c
@@ -449,7 +449,7 @@ temp_stream (FILE **fp, char **file_name)
       int fd = mkstemp (tempfile);
       if (fd < 0)
         {
-          error (0, errno, _("cannot create temporary file in %s"),
+          error (0, errno, _("failed to create temporary file in %s"),
                  quote (tempdir));
           goto Reset;
         }
@@ -457,7 +457,8 @@ temp_stream (FILE **fp, char **file_name)
       tmp_fp = fdopen (fd, (O_BINARY ? "w+b" : "w+"));
       if (! tmp_fp)
         {
-          error (0, errno, _("cannot open %s for writing"), quote (tempfile));
+          error (0, errno, _("failed to open %s for writing"),
+                 quote (tempfile));
           close (fd);
           unlink (tempfile);
         Reset:
@@ -569,7 +570,8 @@ tac_file (const char *filename)
       fd = open (filename, O_RDONLY | O_BINARY);
       if (fd < 0)
         {
-          error (0, errno, _("cannot open %s for reading"), quote (filename));
+          error (0, errno, _("failed to open %s for reading"),
+                 quote (filename));
           return false;
         }
     }
diff --git a/tests/misc/tac b/tests/misc/tac
index 7bd07bd8a..56021280b 100755
--- a/tests/misc/tac
+++ b/tests/misc/tac
@@ -68,7 +68,7 @@ my @Tests =
    {ENV => "TMPDIR=$bad_dir"},
    {IN_PIPE => "a\n"},
    {ERR_SUBST => "s,`$bad_dir': .*,...,"},
-   {ERR => "$prog: cannot create temporary file in ...\n"},
+   {ERR => "$prog: failed to create temporary file in ...\n"},
    {EXIT => 1}],
 
   # coreutils-8.5's tac would double-free its primary buffer.