From 3b7a102d3e64ed2d6b43d8e19d94568d695931a3 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 13 Feb 2014 19:32:30 +0100 Subject: 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 --- commands/readf.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 commands/readf.c (limited to 'commands/readf.c') 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 +#include +#include +#include +#include +#include +#include + +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 \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 -- cgit v1.2.3