[PATCH] cmd: setexpr: add dec operation for converting variable to decimal

[roland.gaudig-oss at weidmueller.com]

From: Roland Gaudig <roland.gaudig at weidmueller.com>

This patch extends the setexpr command with a dec operator to
convert an input value to decimal.

Signed-off-by: Roland Gaudig <roland.gaudig at weidmueller.com>
---
 cmd/setexpr.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/cmd/setexpr.c b/cmd/setexpr.c
index e828be3970..2d4bee2182 100644
--- a/cmd/setexpr.c
+++ b/cmd/setexpr.c
@@ -370,15 +370,16 @@ static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
 	int w;
 
 	/*
-	 * We take 3, 5, or 6 arguments:
+	 * We take 3, 4, 5, or 6 arguments:
 	 * 3 : setexpr name value
+	 * 4 : setexpr name dec value
 	 * 5 : setexpr name val1 op val2
 	 *     setexpr name [g]sub r s
 	 * 6 : setexpr name [g]sub r s t
 	 */
 
 	/* > 6 already tested by max command args */
-	if ((argc < 3) || (argc == 4))
+	if (argc < 3)
 		return CMD_RET_USAGE;
 
 	w = cmd_get_data_size(argv[0], 4);
@@ -398,6 +399,13 @@ static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
 		return ret;
 	}
 
+	/* hexadecimal to decimal conversion: "setexpr name dec value" */
+	if (argc == 4 && (strcmp(argv[2], "dec") == 0)) {
+		w = cmd_get_data_size(argv[3], 4);
+		a = get_arg(argv[3], w);
+		return env_set_ulong(argv[1], a);
+	}
+
 	/* 5 or 6 args (6 args only with [g]sub) */
 #ifdef CONFIG_REGEX
 	/*
@@ -515,4 +523,8 @@ U_BOOT_CMD(
 	"setexpr name sub r s [t]\n"
 	"    - Just like gsub(), but replace only the first matching substring"
 #endif
+	"\n"
+	"setexpr name dec [*]value\n"
+	"    - set environment variable 'name' to the result of the decimal\n"
+	"      conversion of [*]value.\n"
 );
-- 
2.25.1