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@xxxxxxxxxxxxxx>
---
commands/Kconfig | 6 ++++++
commands/Makefile | 1 +
commands/readf.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 70 insertions(+)
create mode 100644 commands/readf.c
diff --git a/commands/Kconfig b/commands/Kconfig
index 1e07b5b..352e8bf 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -57,6 +57,12 @@ config CMD_READLINE
tristate
prompt "readline"
+config CMD_READF
+ tristate
+ prompt "readf"
+ help
+ The readf command is used to read a files content into a shell variable.
+
config CMD_LET
tristate
prompt "let"
diff --git a/commands/Makefile b/commands/Makefile
index 58d27fa..91ec0e9 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -93,3 +93,4 @@ obj-$(CONFIG_CMD_MIITOOL) += miitool.o
obj-$(CONFIG_CMD_DETECT) += detect.o
obj-$(CONFIG_CMD_BOOT) += boot.o
obj-$(CONFIG_CMD_DEVINFO) += devinfo.o
+obj-$(CONFIG_CMD_READF) += readf.o
diff --git a/commands/readf.c b/commands/readf.c
new file mode 100644
index 0000000..6314c7e
--- /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
--
1.8.5.3
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