cmd_nvedit.c: Add env exists command

[platform/kernel/u-boot.git] / common / cmd_nvedit.c

diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index ba9ba16..0d4d02c 100644 (file)
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -1059,6 +1059,23 @@ sep_err:
 }
 #endif
 
+#if defined(CONFIG_CMD_ENV_EXISTS)
+static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
+                      char * const argv[])
+{
+       ENTRY e, *ep;
+
+       if (argc < 2)
+               return CMD_RET_USAGE;
+
+       e.key = argv[1];
+       e.data = NULL;
+       hsearch_r(e, FIND, &ep, &env_htab, 0);
+
+       return (ep == NULL) ? 1 : 0;
+}
+#endif
+
 /*
  * New command line interface: "env" command with subcommands
  */
@@ -1094,6 +1111,9 @@ static cmd_tbl_t cmd_env_sub[] = {
        U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
 #endif
        U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
+#if defined(CONFIG_CMD_ENV_EXISTS)
+       U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
+#endif
 };
 
 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
@@ -1136,6 +1156,9 @@ static char env_help_text[] =
 #if defined(CONFIG_CMD_EDITENV)
        "env edit name - edit environment variable\n"
 #endif
+#if defined(CONFIG_CMD_ENV_EXISTS)
+       "env exists name - tests for existence of variable\n"
+#endif
 #if defined(CONFIG_CMD_EXPORTENV)
        "env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
 #endif