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/* err.c - error handling routines */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2005,2007,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/err.h>
#include <grub/misc.h>
#include <stdarg.h>
#include <grub/i18n.h>
#define GRUB_MAX_ERRMSG 256
#define GRUB_ERROR_STACK_SIZE 10
grub_err_t grub_errno;
char grub_errmsg[GRUB_MAX_ERRMSG];
int grub_err_printed_errors;
static struct
{
grub_err_t errno;
char errmsg[GRUB_MAX_ERRMSG];
} grub_error_stack_items[GRUB_ERROR_STACK_SIZE];
static int grub_error_stack_pos;
static int grub_error_stack_assert;
grub_err_t
grub_error (grub_err_t n, const char *fmt, ...)
{
va_list ap;
grub_errno = n;
va_start (ap, fmt);
grub_vsnprintf (grub_errmsg, sizeof (grub_errmsg), _(fmt), ap);
va_end (ap);
return n;
}
void
grub_fatal (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
grub_vprintf (_(fmt), ap);
va_end (ap);
grub_abort ();
}
void
grub_error_push (void)
{
/* Only add items to stack, if there is enough room. */
if (grub_error_stack_pos < GRUB_ERROR_STACK_SIZE)
{
/* Copy active error message to stack. */
grub_error_stack_items[grub_error_stack_pos].errno = grub_errno;
grub_memcpy (grub_error_stack_items[grub_error_stack_pos].errmsg,
grub_errmsg,
sizeof (grub_errmsg));
/* Advance to next error stack position. */
grub_error_stack_pos++;
}
else
{
/* There is no room for new error message. Discard new error message
and mark error stack assertion flag. */
grub_error_stack_assert = 1;
}
/* Allow further operation of other components by resetting
active errno to GRUB_ERR_NONE. */
grub_errno = GRUB_ERR_NONE;
}
int
grub_error_pop (void)
{
if (grub_error_stack_pos > 0)
{
/* Pop error message from error stack to current active error. */
grub_error_stack_pos--;
grub_errno = grub_error_stack_items[grub_error_stack_pos].errno;
grub_memcpy (grub_errmsg,
grub_error_stack_items[grub_error_stack_pos].errmsg,
sizeof (grub_errmsg));
return 1;
}
else
{
/* There is no more items on error stack, reset to no error state. */
grub_errno = GRUB_ERR_NONE;
return 0;
}
}
void
grub_print_error (void)
{
/* Print error messages in reverse order. First print active error message
and then empty error stack. */
do
{
if (grub_errno != GRUB_ERR_NONE)
{
grub_err_printf (_("error: %s.\n"), grub_errmsg);
grub_err_printed_errors++;
}
}
while (grub_error_pop ());
/* If there was an assert while using error stack, report about it. */
if (grub_error_stack_assert)
{
grub_err_printf ("assert: error stack overflow detected!\n");
grub_error_stack_assert = 0;
}
}
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