From 2d40bd4530c2e2ae26663d4d3ea4bd4eae19407d Mon Sep 17 00:00:00 2001
From: Leo C.
Date: Tue, 6 Aug 2024 00:45:49 +0200
Subject: add commands type and xxd: print files/dump as hex

---
 avr/cmd_fat.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/avr/cmd_fat.c b/avr/cmd_fat.c
index 18784e0..8c8a308 100644
--- a/avr/cmd_fat.c
+++ b/avr/cmd_fat.c
@@ -804,6 +804,53 @@ command_ret_t do_rw(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc,
 	return CMD_RET_SUCCESS;
 }
 
+command_ret_t do_dump(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char * const argv[])
+{
+	FIL File;
+	FRESULT res;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	bool hexdump = argv[0][0] == 'x';
+
+	uint8_t *buffer = (uint8_t *) malloc(BUFFER_SIZE);
+	if (buffer == NULL)
+		cmd_error(CMD_RET_FAILURE, ENOMEM, NULL);
+
+	res = f_open(&File, argv[1], FA_READ );
+
+	if (res == FR_OK) {
+		uint32_t filepos = 0;
+		uint8_t ch = '\n';
+		for (;;) {
+			unsigned int br;
+
+			res = f_read(&File, buffer, BUFFER_SIZE, &br);
+			if (br == 0) break;
+			/* Print the lines. */
+			if (hexdump)
+				dump_ram(buffer, filepos, br, NULL);
+			else {
+				for (unsigned int i = 0; i < br; ++i) {
+					putchar(ch = buffer[i]);
+				}
+			}
+			filepos += br;
+		}
+		if (!hexdump && (ch != '\n'))
+			putchar('\n');
+	}
+
+	f_close(&File);
+	free(buffer);
+
+	if (res)
+		cmd_error(CMD_RET_FAILURE, res, PSTR("'%s'"), argv[1]);
+
+	return CMD_RET_SUCCESS;
+}
+
 /*
  * command table for fat subcommands
  */
@@ -912,6 +959,16 @@ CMD_TBL_ITEM(
 	"    - Write file to 'path/filename' on logical drive 'd' from RAM\n"
 	"      starting at address 'addr'.\n"
 ),
+CMD_TBL_ITEM(
+	xxd,	2,	1|CTBL_SUBCMDAUTO, do_dump,
+	"print file as hexdump",
+	"<d:/path/filename>\n"
+),
+CMD_TBL_ITEM(
+	type,	2,	1|CTBL_SUBCMDAUTO, do_dump,
+	"print file",
+	"<d:/path/filename>\n"
+),
 
 CMD_TBL_ITEM(
 	help,	CONFIG_SYS_MAXARGS,	CTBL_RPT,	do_help,
-- 
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