cmd/xxd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2022
   4  * Roger Knecht <rknecht@pm.de>
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <display_options.h>
  10 #include <fs.h>
  11 #include <malloc.h>
  12 #include <mapmem.h>
  13
  14 static int do_xxd(struct cmd_tbl *cmdtp, int flag, int argc,
  15                   char *const argv[])
  16 {
  17         char *ifname;
  18         char *dev;
  19         char *file;
  20         char *buffer;
  21         phys_addr_t addr;
  22         loff_t file_size;
  23
  24         if (argc < 4)
  25                 return CMD_RET_USAGE;
  26
  27         ifname = argv[1];
  28         dev = argv[2];
  29         file = argv[3];
  30
  31         // check file exists
  32         if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
  33                 return CMD_RET_FAILURE;
  34
  35         if (!fs_exists(file)) {
  36                 log_err("File does not exist: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  37                 return CMD_RET_FAILURE;
  38         }
  39
  40         // get file size
  41         if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
  42                 return CMD_RET_FAILURE;
  43
  44         if (fs_size(file, &file_size)) {
  45                 log_err("Cannot read file size: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  46                 return CMD_RET_FAILURE;
  47         }
  48
  49         // allocate memory for file content
  50         buffer = calloc(sizeof(char), file_size);
  51         if (!buffer) {
  52                 log_err("Out of memory\n");
  53                 return CMD_RET_FAILURE;
  54         }
  55
  56         // map pointer to system memory
  57         addr = map_to_sysmem(buffer);
  58
  59         // read file to memory
  60         if (fs_set_blk_dev(ifname, dev, FS_TYPE_ANY))
  61                 return CMD_RET_FAILURE;
  62
  63         if (fs_read(file, addr, 0, 0, &file_size)) {
  64                 log_err("Cannot read file: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  65                 return CMD_RET_FAILURE;
  66         }
  67
  68         // print file content
  69         print_buffer(0, buffer, sizeof(char), file_size, 0);
  70
  71         free(buffer);
  72
  73         return 0;
  74 }
  75
  76 U_BOOT_LONGHELP(xxd,
  77         "<interface> <dev[:part]> <file>\n"
  78         "  - Print file from 'dev' on 'interface' as hexdump to standard output\n");
  79
  80 U_BOOT_CMD(xxd, 4, 1, do_xxd,
  81            "Print file as hexdump to standard output",
  82            xxd_help_text
  83 );