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88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/* command.c - support basic command */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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/mm.h>
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#include <grub/command.h>
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grub_command_t grub_command_list;
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grub_command_t
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grub_register_command_prio (const char *name,
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grub_command_func_t func,
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const char *summary,
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const char *description,
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int prio)
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{
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grub_command_t cmd;
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int inactive = 0;
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grub_command_t *p, q;
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cmd = (grub_command_t) grub_zalloc (sizeof (*cmd));
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if (! cmd)
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return 0;
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cmd->name = name;
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cmd->func = func;
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cmd->summary = (summary) ? summary : "";
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cmd->description = description;
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cmd->flags = 0;
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cmd->prio = prio;
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for (p = &grub_command_list, q = *p; q; p = &(q->next), q = q->next)
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{
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int r;
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r = grub_strcmp (cmd->name, q->name);
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if (r < 0)
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break;
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if (r > 0)
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continue;
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if (cmd->prio >= (q->prio & GRUB_COMMAND_PRIO_MASK))
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{
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q->prio &= ~GRUB_COMMAND_FLAG_ACTIVE;
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break;
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}
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inactive = 1;
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}
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*p = cmd;
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cmd->next = q;
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if (q)
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q->prev = &cmd->next;
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cmd->prev = p;
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if (! inactive)
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cmd->prio |= GRUB_COMMAND_FLAG_ACTIVE;
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return cmd;
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}
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void
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grub_unregister_command (grub_command_t cmd)
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{
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if ((cmd->prio & GRUB_COMMAND_FLAG_ACTIVE) && (cmd->next))
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cmd->next->prio |= GRUB_COMMAND_FLAG_ACTIVE;
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grub_list_remove (GRUB_AS_LIST (cmd));
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grub_free (cmd);
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}
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