6a12410384
* kern/err.c (grub_error_push): Added new function to support error stacks. (grub_error_pop): Likewise. (grub_error_stack_items): New local variable to support error stacks. (grub_error_stack_pos): Likewise. (grub_error_stack_assert): Likewise. (GRUB_ERROR_STACK_SIZE): Added new define to configure maximum error stack depth. (grub_print_error): Added support to print errors from error stack. * include/grub/err.h (grub_error_push): Added function prototype. (grub_error_pop): Likewise.
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/* err.c - error handling routines */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <grub/err.h>
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#include <grub/misc.h>
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#include <stdarg.h>
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#define GRUB_MAX_ERRMSG 256
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#define GRUB_ERROR_STACK_SIZE 10
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grub_err_t grub_errno;
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char grub_errmsg[GRUB_MAX_ERRMSG];
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static struct
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{
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grub_err_t errno;
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char errmsg[GRUB_MAX_ERRMSG];
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} grub_error_stack_items[GRUB_ERROR_STACK_SIZE];
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static int grub_error_stack_pos;
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static int grub_error_stack_assert;
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grub_err_t
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grub_error (grub_err_t n, const char *fmt, ...)
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{
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va_list ap;
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grub_errno = n;
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va_start (ap, fmt);
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grub_vsprintf (grub_errmsg, fmt, ap);
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va_end (ap);
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return n;
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}
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void
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grub_fatal (const char *fmt, ...)
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{
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va_list ap;
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va_start (ap, fmt);
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grub_vprintf (fmt, ap);
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va_end (ap);
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grub_stop ();
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}
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void
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grub_error_push (void)
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{
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/* Only add items to stack, if there is enough room. */
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if (grub_error_stack_pos < GRUB_ERROR_STACK_SIZE)
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{
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/* Copy active error message to stack. */
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grub_error_stack_items[grub_error_stack_pos].errno = grub_errno;
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grub_memcpy (grub_error_stack_items[grub_error_stack_pos].errmsg,
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grub_errmsg,
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sizeof (grub_errmsg));
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/* Advance to next error stack position. */
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grub_error_stack_pos++;
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}
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else
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{
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/* There is no room for new error message. Discard new error message
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and mark error stack assertion flag. */
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grub_error_stack_assert = 1;
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}
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/* Allow further operation of other components by resetting
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active errno to GRUB_ERR_NONE. */
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grub_errno = GRUB_ERR_NONE;
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}
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int
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grub_error_pop (void)
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{
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if (grub_error_stack_pos > 0)
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{
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/* Pop error message from error stack to current active error. */
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grub_error_stack_pos--;
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grub_errno = grub_error_stack_items[grub_error_stack_pos].errno;
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grub_memcpy (grub_errmsg,
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grub_error_stack_items[grub_error_stack_pos].errmsg,
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sizeof (grub_errmsg));
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return 1;
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}
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else
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{
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/* There is no more items on error stack, reset to no error state. */
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grub_errno = GRUB_ERR_NONE;
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return 0;
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}
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}
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void
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grub_print_error (void)
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{
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/* Print error messages in reverse order. First print active error message
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and then empty error stack. */
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do
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{
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if (grub_errno != GRUB_ERR_NONE)
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grub_printf ("error: %s\n", grub_errmsg);
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}
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while (grub_error_pop ());
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/* If there was an assert while using error stack, report about it. */
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if (grub_error_stack_assert)
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{
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grub_printf ("assert: error stack overflow detected!\n");
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grub_error_stack_assert = 0;
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}
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}
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