cmd/cat.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2022
   4  * Roger Knecht <rknecht@pm.de>
   5  */
   6
   7 #include <command.h>
   8 #include <fs.h>
   9 #include <malloc.h>
  10 #include <mapmem.h>
  11
  12 static int do_cat(struct cmd_tbl *cmdtp, int flag, int argc,
  13                   char *const argv[])
  14 {
  15         char *ifname;
  16         char *dev;
  17         char *file;
  18         char *buffer;
  19         ulong file_size;
  20         int ret;
  21
  22         if (argc < 4)
  23                 return CMD_RET_USAGE;
  24
  25         ifname = argv[1];
  26         dev = argv[2];
  27         file = argv[3];
  28
  29         ret = fs_load_alloc(ifname, dev, file, 0, 0, (void **)&buffer,
  30                             &file_size);
  31
  32         // check file exists
  33         switch (ret) {
  34         case 0:
  35                 break;
  36         case -ENOMEDIUM:
  37                 return CMD_RET_FAILURE;
  38         case -ENOENT:
  39                 log_err("File does not exist: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  40                 return CMD_RET_FAILURE;
  41         case -E2BIG:
  42                 log_err("File is too large: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  43                 return CMD_RET_FAILURE;
  44         case -ENOMEM:
  45                 log_err("Not enough memory: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  46                 return CMD_RET_FAILURE;
  47         default:
  48         case -EIO:
  49                 log_err("File-read failed: ifname=%s dev=%s file=%s\n", ifname, dev, file);
  50                 return CMD_RET_FAILURE;
  51         }
  52
  53         // print file content
  54         buffer[file_size] = '\0';
  55         puts(buffer);
  56
  57         free(buffer);
  58
  59         return 0;
  60 }
  61
  62 U_BOOT_LONGHELP(cat,
  63         "<interface> <dev[:part]> <file>\n"
  64         "  - Print file from 'dev' on 'interface' to standard output\n");
  65
  66 U_BOOT_CMD(cat, 4, 1, do_cat,
  67            "Print file to standard output",
  68            cat_help_text
  69 );