cli: implement a fn 'cli_err()' to send error messages to 'stderr'

we were using 'cli_out()' to send all the possible msgs, which is not
very friendly with scripts, because if one want to get only valid
output with "<command> 2>/error.log 1>/proper-info.log"

Change-Id: I008ebcbd90935c41dbfc1bd2adeb094ed21116cb
Signed-off-by: Amar Tumballi <amarts@redhat.com>
BUG: 815194
Reviewed-on: http://review.gluster.com/3208
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

1 files changed, 25 insertions, 1 deletions

diff --git a/cli/src/cli.c b/cli/src/cli.c
index 7a490fed2..6a5ecf698 100644
--- a/cli/src/cli.c
+++ b/cli/src/cli.c
@@ -450,11 +450,35 @@ cli_usage_out (const char *usage)
         if (!usage || usage[0] == '\0')
                 return -1;
 
-        cli_out ("Usage: %s", usage);
+        cli_err ("Usage: %s", usage);
         return 0;
 }
 
 int
+_cli_err (const char *fmt, ...)
+{
+        struct cli_state *state = NULL;
+        va_list           ap;
+        int               ret = 0;
+
+        state = global_state;
+
+        va_start (ap, fmt);
+
+#ifdef HAVE_READLINE
+        if (state->rl_enabled && !state->rl_processing)
+                return cli_rl_err(state, fmt, ap);
+#endif
+
+        ret = vfprintf (stderr, fmt, ap);
+        fprintf (stderr, "\n");
+        va_end (ap);
+
+        return ret;
+}
+
+
+int
 _cli_out (const char *fmt, ...)
 {
         struct cli_state *state = NULL;