sandbox: Add basic test for command execution

Since run_command() and run_command_list() are important and a little
confusing, add some basic tests to check that the behaviour is correct.

Note: I am not sure that this should be committed, nor where it should go
in the source tree. Comments welcome.

To run the unit tests use the ut_cmd command available in sandbox:

make sandbox_config
make
./u-boot -c ut_cmd

(To test both hush and built-in parsers, you need to manually change
CONFIG_SYS_HUSH_PARSER in include/configs/sandbox.h and build/run again)

Signed-off-by: Simon Glass <sjg@chromium.org>

Makefile

@@ -304,6 +304,7 @@ LIBS += common/libcommon.o
 LIBS += lib/libfdt/libfdt.o
 LIBS += api/libapi.o
 LIBS += post/libpost.o
+LIBS += test/libtest.o
 
 ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP34XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
 LIBS += $(CPUDIR)/omap-common/libomap-common.o

test/Makefile

@@ -0,0 +1,45 @@
+#
+# (C) Copyright 2012 The Chromium Authors
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)libtest.o
+
+COBJS-$(CONFIG_SANDBOX) += command_ut.o
+
+COBJS	:= $(sort $(COBJS-y))
+SRCS	:= $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+
+all:	$(LIB) $(XOBJS)
+
+$(LIB): $(obj).depend $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################

test/command_ut.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2012, The Chromium Authors
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#define DEBUG
+
+#include <common.h>
+
+static const char test_cmd[] = "setenv list 1\n setenv list ${list}2; "
+		"setenv list ${list}3\0"
+		"setenv list ${list}4";
+
+static int do_ut_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	printf("%s: Testing commands\n", __func__);
+	run_command("env default -f", 0);
+
+	/* run a single command */
+	run_command("setenv single 1", 0);
+	assert(!strcmp("1", getenv("single")));
+
+	/* make sure that compound statements work */
+#ifdef CONFIG_SYS_HUSH_PARSER
+	run_command("if test -n ${single} ; then setenv check 1; fi", 0);
+	assert(!strcmp("1", getenv("check")));
+	run_command("setenv check", 0);
+#endif
+
+	/* commands separated by ; */
+	run_command_list("setenv list 1; setenv list ${list}1", -1, 0);
+	assert(!strcmp("11", getenv("list")));
+
+	/* commands separated by \n */
+	run_command_list("setenv list 1\n setenv list ${list}1", -1, 0);
+	assert(!strcmp("11", getenv("list")));
+
+	/* command followed by \n and nothing else */
+	run_command_list("setenv list 1${list}\n", -1, 0);
+	assert(!strcmp("111", getenv("list")));
+
+	/* three commands in a row */
+	run_command_list("setenv list 1\n setenv list ${list}2; "
+		"setenv list ${list}3", -1, 0);
+	assert(!strcmp("123", getenv("list")));
+
+	/* a command string with \0 in it. Stuff after \0 should be ignored */
+	run_command("setenv list", 0);
+	run_command_list(test_cmd, sizeof(test_cmd), 0);
+	assert(!strcmp("123", getenv("list")));
+
+	/*
+	 * a command list where we limit execution to only the first command
+	 * using the length parameter.
+	 */
+	run_command_list("setenv list 1\n setenv list ${list}2; "
+		"setenv list ${list}3", strlen("setenv list 1"), 0);
+	assert(!strcmp("1", getenv("list")));
+
+	printf("%s: Everything went swimmingly\n", __func__);
+	return 0;
+}
+
+U_BOOT_CMD(
+	ut_cmd,	5,	1,	do_ut_cmd,
+	"Very basic test of command parsers",
+	""
+);