cmd/strings.c

   1 /*
   2  * cmd_strings.c - just like `strings` command
   3  *
   4  * Copyright (c) 2008 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <config.h>
  10 #include <common.h>
  11 #include <command.h>
  12
  13 static char *start_addr, *last_addr;
  14
  15 int do_strings(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  16 {
  17         if (argc == 1)
  18                 return CMD_RET_USAGE;
  19
  20         if ((flag & CMD_FLAG_REPEAT) == 0) {
  21                 start_addr = (char *)simple_strtoul(argv[1], NULL, 16);
  22                 if (argc > 2)
  23                         last_addr = (char *)simple_strtoul(argv[2], NULL, 16);
  24                 else
  25                         last_addr = (char *)-1;
  26         }
  27
  28         char *addr = start_addr;
  29         do {
  30                 puts(addr);
  31                 puts("\n");
  32                 addr += strlen(addr) + 1;
  33         } while (addr[0] && addr < last_addr);
  34
  35         last_addr = addr + (last_addr - start_addr);
  36         start_addr = addr;
  37
  38         return 0;
  39 }
  40
  41 U_BOOT_CMD(
  42         strings, 3, 1, do_strings,
  43         "display strings",
  44         "<addr> [byte count]\n"
  45         "    - display strings at <addr> for at least [byte count] or first double NUL"
  46 );