cmd/cli.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <cli.h>
   4 #include <command.h>
   5 #include <string.h>
   6 #include <asm/global_data.h>
   7
   8 DECLARE_GLOBAL_DATA_PTR;
   9
  10 static const char *gd_flags_to_parser_name(void)
  11 {
  12         if (gd->flags & GD_FLG_HUSH_OLD_PARSER)
  13                 return "old";
  14         if (gd->flags & GD_FLG_HUSH_MODERN_PARSER)
  15                 return "modern";
  16         return NULL;
  17 }
  18
  19 static int do_cli_get(struct cmd_tbl *cmdtp, int flag, int argc,
  20                          char *const argv[])
  21 {
  22         const char *current = gd_flags_to_parser_name();
  23
  24         if (!current) {
  25                 printf("current cli value is not valid, this should not happen!\n");
  26                 return CMD_RET_FAILURE;
  27         }
  28
  29         printf("%s\n", current);
  30
  31         return CMD_RET_SUCCESS;
  32 }
  33
  34 static int parser_string_to_gd_flags(const char *parser)
  35 {
  36         if (!strcmp(parser, "old"))
  37                 return GD_FLG_HUSH_OLD_PARSER;
  38         if (!strcmp(parser, "modern"))
  39                 return GD_FLG_HUSH_MODERN_PARSER;
  40         return -1;
  41 }
  42
  43 static int gd_flags_to_parser_config(int flag)
  44 {
  45         if (gd->flags & GD_FLG_HUSH_OLD_PARSER)
  46                 return CONFIG_VAL(HUSH_OLD_PARSER);
  47         if (gd->flags & GD_FLG_HUSH_MODERN_PARSER)
  48                 return CONFIG_VAL(HUSH_MODERN_PARSER);
  49         return -1;
  50 }
  51
  52 static void reset_parser_gd_flags(void)
  53 {
  54         gd->flags &= ~GD_FLG_HUSH_OLD_PARSER;
  55         gd->flags &= ~GD_FLG_HUSH_MODERN_PARSER;
  56 }
  57
  58 static int do_cli_set(struct cmd_tbl *cmdtp, int flag, int argc,
  59                       char *const argv[])
  60 {
  61         char *parser_name;
  62         int parser_config;
  63         int parser_flag;
  64
  65         if (argc < 2)
  66                 return CMD_RET_USAGE;
  67
  68         parser_name = argv[1];
  69
  70         parser_flag = parser_string_to_gd_flags(parser_name);
  71         if (parser_flag == -1) {
  72                 printf("Bad value for parser name: %s\n", parser_name);
  73                 return CMD_RET_USAGE;
  74         }
  75
  76         parser_config = gd_flags_to_parser_config(parser_flag);
  77         switch (parser_config) {
  78         case -1:
  79                 printf("Bad value for parser flags: %d\n", parser_flag);
  80                 return CMD_RET_FAILURE;
  81         case 0:
  82                 printf("Want to set current parser to %s, but its code was not compiled!\n",
  83                         parser_name);
  84                 return CMD_RET_FAILURE;
  85         }
  86
  87         reset_parser_gd_flags();
  88         gd->flags |= parser_flag;
  89
  90         cli_init();
  91         cli_loop();
  92
  93         /* cli_loop() should never return. */
  94         return CMD_RET_FAILURE;
  95 }
  96
  97 static struct cmd_tbl parser_sub[] = {
  98         U_BOOT_CMD_MKENT(get, 1, 1, do_cli_get, "", ""),
  99         U_BOOT_CMD_MKENT(set, 2, 1, do_cli_set, "", ""),
 100 };
 101
 102 static int do_cli(struct cmd_tbl *cmdtp, int flag, int argc,
 103                   char *const argv[])
 104 {
 105         struct cmd_tbl *cp;
 106
 107         if (argc < 2)
 108                 return CMD_RET_USAGE;
 109
 110         /* drop initial "parser" arg */
 111         argc--;
 112         argv++;
 113
 114         cp = find_cmd_tbl(argv[0], parser_sub, ARRAY_SIZE(parser_sub));
 115         if (cp)
 116                 return cp->cmd(cmdtp, flag, argc, argv);
 117
 118         return CMD_RET_USAGE;
 119 }
 120
 121 U_BOOT_LONGHELP(cli,
 122         "get - print current cli\n"
 123         "set - set the current cli, possible value are: old, modern\n");
 124
 125 U_BOOT_CMD(cli, 3, 1, do_cli,
 126            "cli",
 127            cli_help_text
 128 );