cmd: cat: add new command
Add cat command to print file content to standard out
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Roger Knecht <rknecht@pm.me>
diff --git a/cmd/cat.c b/cmd/cat.c
new file mode 100644
index 0000000..1273a26
--- /dev/null
+++ b/cmd/cat.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022
+ * Roger Knecht <rknecht@pm.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <fs.h>
+#include <malloc.h>
+#include <mapmem.h>
+
+static int do_cat(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ char *ifname;
+ char *dev;
+ char *file;
+ char *buffer;
+ phys_addr_t addr;
+ loff_t file_size;
+
+ if (argc < 4)
+ return CMD_RET_USAGE;
+
+ ifname = argv[1];
+ dev = argv[2];
+ file = argv[3];
+
+ // check file exists
+ if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
+ return CMD_RET_FAILURE;
+
+ if (!fs_exists(file)) {
+ log_err("File does not exist: ifname=%s dev=%s file=%s\n", ifname, dev, file);
+ return CMD_RET_FAILURE;
+ }
+
+ // get file size
+ if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
+ return CMD_RET_FAILURE;
+
+ if (fs_size(file, &file_size)) {
+ log_err("Cannot read file size: ifname=%s dev=%s file=%s\n", ifname, dev, file);
+ return CMD_RET_FAILURE;
+ }
+
+ // allocate memory for file content
+ buffer = calloc(sizeof(char), file_size + 1);
+ if (!buffer) {
+ log_err("Out of memory\n");
+ return CMD_RET_FAILURE;
+ }
+
+ // map pointer to system memory
+ addr = map_to_sysmem(buffer);
+
+ // read file to memory
+ if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
+ return CMD_RET_FAILURE;
+
+ if (fs_read(file, addr, 0, 0, &file_size)) {
+ log_err("Cannot read file: ifname=%s dev=%s file=%s\n", ifname, dev, file);
+ return CMD_RET_FAILURE;
+ }
+
+ // print file content
+ buffer[file_size] = '\0';
+ puts(buffer);
+
+ free(buffer);
+
+ return 0;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char cat_help_text[] =
+ "<interface> <dev[:part]> <file>\n"
+ " - Print file from 'dev' on 'interface' to standard output\n";
+#endif
+
+U_BOOT_CMD(cat, 4, 1, do_cat,
+ "Print file to standard output",
+ cat_help_text
+);