144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/* help.c - command to show a help text. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/term.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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#include <grub/mm.h>
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#include <grub/normal.h>
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#include <grub/charset.h>
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static grub_err_t
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grub_cmd_help (grub_extcmd_t ext __attribute__ ((unused)), int argc,
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char **args)
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{
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int cnt = 0;
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char *currarg;
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auto int print_command_info (grub_command_t cmd);
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auto int print_command_help (grub_command_t cmd);
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int print_command_info (grub_command_t cmd)
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{
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if ((cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE) &&
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(cmd->flags & GRUB_COMMAND_FLAG_CMDLINE))
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{
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struct grub_term_output *term;
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const char *summary_translated = _(cmd->summary);
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char *command_help;
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grub_uint32_t *unicode_command_help;
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grub_uint32_t *unicode_last_position;
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command_help = grub_xasprintf ("%s %s", cmd->name, summary_translated);
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if (!command_help)
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return 1;
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grub_utf8_to_ucs4_alloc (command_help, &unicode_command_help,
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&unicode_last_position);
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FOR_ACTIVE_TERM_OUTPUTS(term)
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{
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unsigned stringwidth;
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grub_uint32_t *unicode_last_screen_position;
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unicode_last_screen_position = unicode_command_help;
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stringwidth = 0;
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while (unicode_last_screen_position < unicode_last_position &&
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stringwidth < ((grub_term_width (term) / 2) - 2))
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{
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stringwidth
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+= grub_term_getcharwidth (term,
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*unicode_last_screen_position);
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unicode_last_screen_position++;
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}
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grub_print_ucs4 (unicode_command_help,
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unicode_last_screen_position, term);
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if (!(cnt % 2))
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grub_print_spaces (term, grub_term_width (term) / 2
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- stringwidth);
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}
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if (cnt % 2)
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grub_printf ("\n");
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cnt++;
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grub_free (command_help);
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grub_free (unicode_command_help);
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}
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return 0;
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}
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int print_command_help (grub_command_t cmd)
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{
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if (cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE)
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{
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if (! grub_strncmp (cmd->name, currarg, grub_strlen (currarg)))
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{
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if (cnt++ > 0)
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grub_printf ("\n\n");
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if (cmd->flags & GRUB_COMMAND_FLAG_EXTCMD)
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grub_arg_show_help ((grub_extcmd_t) cmd->data);
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else
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grub_printf ("%s %s %s\n%s\n", _("Usage:"), cmd->name, _(cmd->summary),
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_(cmd->description));
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}
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}
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return 0;
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}
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if (argc == 0)
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{
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grub_command_iterate (print_command_info);
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if (!(cnt % 2))
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grub_printf ("\n");
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}
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else
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{
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int i;
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for (i = 0; i < argc; i++)
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{
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currarg = args[i];
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grub_command_iterate (print_command_help);
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}
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}
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return 0;
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}
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static grub_extcmd_t cmd;
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GRUB_MOD_INIT(help)
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{
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cmd = grub_register_extcmd ("help", grub_cmd_help,
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GRUB_COMMAND_FLAG_CMDLINE,
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N_("[PATTERN ...]"),
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N_("Show a help message."), 0);
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}
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GRUB_MOD_FINI(help)
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{
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grub_unregister_extcmd (cmd);
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}
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