cmd_nvedit.c: Add env exists command
env exists is a way to test (in hush) if an environment variable exists. A workaround existed using printenv but this new command doesn't require all the stdout/stderr redirection to prevent printing information to the screen. Example: $ set testexists 1 $ env exists testexists && echo "yes" yes $ env exists testexists || echo "no" $ set testexists $ env exists testexists && echo "yes" $ env exists testexists || echo "no" no $ Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>utp
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README
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README
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@ -848,6 +848,7 @@ The following options need to be configured:
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CONFIG_CMD_ELF * bootelf, bootvx
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CONFIG_CMD_ELF * bootelf, bootvx
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CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
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CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
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CONFIG_CMD_ENV_FLAGS * display details about env flags
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CONFIG_CMD_ENV_FLAGS * display details about env flags
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CONFIG_CMD_ENV_EXISTS * check existence of env variable
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CONFIG_CMD_EXPORTENV * export the environment
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CONFIG_CMD_EXPORTENV * export the environment
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CONFIG_CMD_EXT2 * ext2 command support
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CONFIG_CMD_EXT2 * ext2 command support
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CONFIG_CMD_EXT4 * ext4 command support
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CONFIG_CMD_EXT4 * ext4 command support
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@ -1059,6 +1059,23 @@ sep_err:
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}
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}
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#endif
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#endif
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#if defined(CONFIG_CMD_ENV_EXISTS)
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static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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ENTRY e, *ep;
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if (argc < 2)
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return CMD_RET_USAGE;
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e.key = argv[1];
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e.data = NULL;
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hsearch_r(e, FIND, &ep, &env_htab, 0);
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return (ep == NULL) ? 1 : 0;
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}
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#endif
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/*
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/*
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* New command line interface: "env" command with subcommands
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* New command line interface: "env" command with subcommands
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*/
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*/
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@ -1094,6 +1111,9 @@ static cmd_tbl_t cmd_env_sub[] = {
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U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
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U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
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#endif
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#endif
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U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
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U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
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#if defined(CONFIG_CMD_ENV_EXISTS)
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U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
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#endif
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};
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};
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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@ -1136,6 +1156,9 @@ static char env_help_text[] =
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#if defined(CONFIG_CMD_EDITENV)
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#if defined(CONFIG_CMD_EDITENV)
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"env edit name - edit environment variable\n"
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"env edit name - edit environment variable\n"
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#endif
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#endif
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#if defined(CONFIG_CMD_ENV_EXISTS)
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"env exists name - tests for existence of variable\n"
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#endif
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#if defined(CONFIG_CMD_EXPORTENV)
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#if defined(CONFIG_CMD_EXPORTENV)
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"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
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"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
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#endif
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#endif
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