sleep: fix "sleep -- ARGS"

function                                             old     new   delta
sleep_main                                           116     119      +3
printf_main                                          860     837     -23
single_argv                                           50      25     -25
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 3/-48)             Total: -45 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/libbb/single_argv.c b/libbb/single_argv.c
index 64844ddf8..594cb0d8d 100644
--- a/libbb/single_argv.c
+++ b/libbb/single_argv.c
@@ -8,11 +8,18 @@
  */
 #include "libbb.h"
 
-char* FAST_FUNC single_argv(char **argv)
+char** FAST_FUNC skip_dash_dash(char **argv)
 {
-	if (argv[1] && strcmp(argv[1], "--") == 0)
+	argv++;
+	if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0')
 		argv++;
-	if (!argv[1] || argv[2])
+	return argv;
+}
+
+char* FAST_FUNC single_argv(char **argv)
+{
+	argv = skip_dash_dash(argv);
+	if (!argv[0] || argv[1])
 		bb_show_usage();
-	return argv[1];
+	return argv[0];
 }