"env grep" - add options to grep in name, value, or both.

Add options to "env grep" command:

-n : search only the envrironment variable names
-v : search only their values
-b : search both names and values (= default)

An option "--" will stop parsing options, so to print variables that
contain the striing "- " please use:

	env grep -- "- "

Or to print all environment varioables which have a '-' in their name,
use:

	env grep -n -- -

Signed-off-by: Wolfgang Denk <wd@denx.de>

diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index a4b71f8..9158b96 100644 (file)
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -165,13 +165,39 @@ static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
                       int argc, char * const argv[])
 {
        char *res = NULL;
-       int len;
+       int len, grep_flags;
 
        if (argc < 2)
                return CMD_RET_USAGE;
 
+       grep_flags = H_MATCH_BOTH;
+
+       while (argc > 1 && **(argv + 1) == '-') {
+               char *arg = *++argv;
+
+               --argc;
+               while (*++arg) {
+                       switch (*arg) {
+                       case 'n':               /* grep for name */
+                               grep_flags = H_MATCH_KEY;
+                               break;
+                       case 'v':               /* grep for value */
+                               grep_flags = H_MATCH_DATA;
+                               break;
+                       case 'b':               /* grep for both */
+                               grep_flags = H_MATCH_BOTH;
+                               break;
+                       case '-':
+                               goto DONE;
+                       default:
+                               return CMD_RET_USAGE;
+                       }
+               }
+       }
+
+DONE:
        len = hexport_r(&env_htab, '\n',
-                       flag | H_MATCH_BOTH | H_MATCH_SUBSTR,
+                       flag | grep_flags | H_MATCH_SUBSTR,
                        &res, 0, argc, argv);
 
        if (len > 0) {
@@ -1127,7 +1153,7 @@ static char env_help_text[] =
        "env flags - print variables that have non-default flags\n"
 #endif
 #if defined(CONFIG_CMD_GREPENV)
-       "env grep string [...] - search environment\n"
+       "env grep [-n | -v | -b] string [...] - search environment\n"
 #endif
 #if defined(CONFIG_CMD_IMPORTENV)
        "env import [-d] [-t | -b | -c] addr [size] - import environment\n"
@@ -1174,8 +1200,10 @@ U_BOOT_CMD_COMPLETE(
 U_BOOT_CMD_COMPLETE(
        grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
        "search environment variables",
-       "string ...\n"
-       "    - list environment name=value pairs matching 'string'",
+       "[-n | -v | -b] string ...\n"
+       "    - list environment name=value pairs matching 'string'\n"
+       "      \"-n\": search variable names; \"-v\": search values;\n"
+       "      \"-b\": search both names and values (default)",
        var_complete
 );
 #endif