[PATCH] cmd: cat: add new command

[Roger Knecht]

Add cat command to print file content to standard out

Signed-off-by: Roger Knecht <rknecht at pm.me>
---
 cmd/Kconfig  |  6 ++++++
 cmd/Makefile |  1 +
 cmd/cat.c    | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 cmd/cat.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 69c1814d24..2cb719795c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -385,6 +385,12 @@ config CMD_ABOOTIMG

 	  See doc/android/boot-image.rst for details.

+config CMD_CAT
+	bool "cat"
+	default y
+	help
+	  print file to standard output
+
 config CMD_ELF
 	bool "bootelf, bootvx"
 	default y
diff --git a/cmd/Makefile b/cmd/Makefile
index 5e43a1e022..589b9680ba 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_CMD_BOOTZ) += bootz.o
 obj-$(CONFIG_CMD_BOOTI) += booti.o
 obj-$(CONFIG_CMD_BTRFS) += btrfs.o
 obj-$(CONFIG_CMD_BUTTON) += button.o
+obj-$(CONFIG_CMD_CAT) += cat.o
 obj-$(CONFIG_CMD_CACHE) += cache.o
 obj-$(CONFIG_CMD_CBFS) += cbfs.o
 obj-$(CONFIG_CMD_CLK) += clk.o
diff --git a/cmd/cat.c b/cmd/cat.c
new file mode 100644
index 0000000000..4ba3b611aa
--- /dev/null
+++ b/cmd/cat.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022
+ * Roger Knecht <rknecht at pm.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <fs.h>
+#include <malloc.h>
+
+static int do_cat(struct cmd_tbl *cmdtp, int flag, int argc,
+		  char *const argv[])
+{
+	char *data;
+	loff_t index;
+	loff_t size;
+	int ret;
+
+	if (argc < 4)
+		return CMD_RET_USAGE;
+
+	ret = fs_set_blk_dev(argv[1], argv[2], FS_TYPE_ANY);
+	if (ret)
+		return ret;
+
+	ret = fs_size(argv[3], &size);
+	if (ret)
+		return ret;
+
+	data = malloc(size);
+	if (!data)
+		return -ENOMEM;
+
+	ret = fs_set_blk_dev(argv[1], argv[2], FS_TYPE_ANY);
+	if (ret)
+		return ret;
+
+	ret = fs_read(argv[3], (ulong)data, 0, 0, &size);
+	if (ret)
+		return ret;
+
+	for (index = 0; index < size; index++)
+		putc(data[index]);
+
+	free(data);
+
+	return 0;
+}
+
+U_BOOT_CMD(cat, 4, 1, do_cat,
+	   "print file to standard output",
+	   "<interface> <dev[:part]> file\n"
+	   "	- print file from 'dev' on 'interface' to standard output");
--
2.17.1