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author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-08-17 00:49:46 +0800 |
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committer | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-09-05 03:22:14 +0800 |
commit | 69a4ea15dbd5c3f0beac0f6a034a7dd2f13ff383 (patch) | |
tree | 3442cbd8c31a29953baed048de6f1093f2024842 /commands/readlink.c | |
parent | f26472f2d1fe42e8d96fafae1077e5a67767a236 (diff) | |
download | barebox-69a4ea15dbd5c3f0beac0f6a034a7dd2f13ff383.tar.gz barebox-69a4ea15dbd5c3f0beac0f6a034a7dd2f13ff383.tar.xz |
command: add readlink support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'commands/readlink.c')
-rw-r--r-- | commands/readlink.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/commands/readlink.c b/commands/readlink.c new file mode 100644 index 0000000000..d2671e0f2e --- /dev/null +++ b/commands/readlink.c @@ -0,0 +1,80 @@ +/* + * readlink.c - read value of a symbolic link + * + * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> + * + * 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 version 2 + * as published by the Free Software Foundation. + * + * 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 <common.h> +#include <command.h> +#include <libgen.h> +#include <environment.h> +#include <fs.h> +#include <malloc.h> +#include <getopt.h> + +static int do_readlink(int argc, char *argv[]) +{ + char realname[PATH_MAX]; + int canonicalize = 0; + int opt; + + memset(realname, 0, PATH_MAX); + + while ((opt = getopt(argc, argv, "f")) > 0) { + switch (opt) { + case 'f': + canonicalize = 1; + break; + } + } + + if (argc < optind + 2) + return COMMAND_ERROR_USAGE; + + if (readlink(argv[optind], realname, PATH_MAX - 1) < 0) + goto err; + + if (canonicalize) { + char *buf = normalise_link(argv[optind], realname); + + if (!buf) + goto err; + setenv(argv[optind + 1], buf); + free(buf); + } else { + setenv(argv[optind + 1], realname); + } + + return 0; +err: + setenv(argv[optind + 1], ""); + return 1; +} + +BAREBOX_CMD_HELP_START(readlink) +BAREBOX_CMD_HELP_USAGE("readlink [-f] FILE REALNAME\n") +BAREBOX_CMD_HELP_SHORT("read value of a symbolic link and store into $REALNAME\n") +BAREBOX_CMD_HELP_SHORT("-f canonicalize by following first symlink"); +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(readlink) + .cmd = do_readlink, + .usage = "read value of a symbolic link", + BAREBOX_CMD_HELP(cmd_readlink_help) +BAREBOX_CMD_END |