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author | Sascha Hauer <s.hauer@pengutronix.de> | 2014-02-13 19:32:30 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-02-14 16:40:13 +0100 |
commit | 3b7a102d3e64ed2d6b43d8e19d94568d695931a3 (patch) | |
tree | 54fa141901fb062d1de0c4db8d84cc336d286907 /commands/readf.c | |
parent | 6280e991eef453aba8ed1187db60992fad785d7d (diff) | |
download | barebox-3b7a102d3e64ed2d6b43d8e19d94568d695931a3.tar.gz barebox-3b7a102d3e64ed2d6b43d8e19d94568d695931a3.tar.xz |
Add readf command
The readf command is useful to read the content of a file into
a shell variable. It should be used for ascii content and thus
stops reading at all nonprintable characters including newline.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/readf.c')
-rw-r--r-- | commands/readf.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/commands/readf.c b/commands/readf.c new file mode 100644 index 0000000000..6314c7ef23 --- /dev/null +++ b/commands/readf.c @@ -0,0 +1,63 @@ +#include <common.h> +#include <command.h> +#include <fs.h> +#include <malloc.h> +#include <linux/stat.h> +#include <linux/ctype.h> +#include <environment.h> + +static int do_readf(int argc, char *argv[]) +{ + unsigned char *buf = NULL, *val; + char *variable, *filename; + struct stat s; + size_t size; + int ret, i; + + if (argc != 3) + return COMMAND_ERROR_USAGE; + + filename = argv[1]; + variable = argv[2]; + + ret = stat(filename, &s); + if (ret) + goto out; + + if (s.st_size > 1024) { + ret = -EFBIG; + goto out; + } + + buf = read_file(filename, &size); + if (!buf) + goto out; + + for (i = 0; i < size; i++) { + if (!isprint(buf[i])) { + buf[i] = '\0'; + break; + } + } + + val = strim(buf); + + ret = setenv(variable, val); +out: + free(buf); + + return ret; +} + +BAREBOX_CMD_HELP_START(readf) +BAREBOX_CMD_HELP_USAGE("readf <file> <variable>\n") +BAREBOX_CMD_HELP_SHORT("Read a single line of a file into a shell variable. Leading and trailing whitespaces\n") +BAREBOX_CMD_HELP_SHORT("are removed, nonvisible characters are stripped. Input is limited to 1024\n") +BAREBOX_CMD_HELP_SHORT("characters.\n") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(readf) + .cmd = do_readf, + .usage = "read file into variable", + BAREBOX_CMD_HELP(cmd_readf_help) +BAREBOX_CMD_END |