cmd/cat.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 <fs.h>
  10 #include <malloc.h>
  11 #include <mapmem.h>
  12
  13 static int do_cat(struct cmd_tbl *cmdtp, int flag, int argc,
  14                   char *const argv[])
  15 {
  16         char *ifname;
  17         char *dev;
  18         char *file;
  19         char *buffer;
  20         ulong file_size;
  21         int ret;
  22
  23         if (argc < 4)
  24                 return CMD_RET_USAGE;
  25
  26         ifname = argv[1];
  27         dev = argv[2];
  28         file = argv[3];
  29
  30         ret = fs_load_alloc(ifname, dev, file, 0, 0, (void **)&buffer,
  31                             &file_size);
  32
  33         // check file exists
  34         switch (ret) {
  35         case 0:
  36                 break;
  37         case -ENOMEDIUM:
  38                 return CMD_RET_FAILURE;
  39         case -ENOENT:
  40                 log_err("File does not exist: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  41                 return CMD_RET_FAILURE;
  42         case -E2BIG:
  43                 log_err("File is too large: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  44                 return CMD_RET_FAILURE;
  45         case -ENOMEM:
  46                 log_err("Not enough memory: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  47                 return CMD_RET_FAILURE;
  48         default:
  49         case -EIO:
  50                 log_err("File-read failed: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  51                 return CMD_RET_FAILURE;
  52         }
  53
  54         // print file content
  55         buffer[file_size] = '\0';
  56         puts(buffer);
  57
  58         free(buffer);
  59
  60         return 0;
  61 }
  62
  63 U_BOOT_LONGHELP(cat,
  64         "<interface> <dev[:part]> <file>\n"
  65         "  - Print file from 'dev' on 'interface' to standard output\n");
  66
  67 U_BOOT_CMD(cat, 4, 1, do_cat,
  68            "Print file to standard output",
  69            cat_help_text
  70 );