arch/all-pc/boot/grub2-aros/grub-core/kern/err.c

   1 /* err.c - error handling routines */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2005,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/err.h>
  21 #include <grub/misc.h>
  22 #include <stdarg.h>
  23 #include <grub/i18n.h>
  24
  25 #define GRUB_MAX_ERRMSG         256
  26 #define GRUB_ERROR_STACK_SIZE   10
  27
  28 grub_err_t grub_errno;
  29 char grub_errmsg[GRUB_MAX_ERRMSG];
  30 int grub_err_printed_errors;
  31
  32 static struct
  33 {
  34   grub_err_t errno;
  35   char errmsg[GRUB_MAX_ERRMSG];
  36 } grub_error_stack_items[GRUB_ERROR_STACK_SIZE];
  37
  38 static int grub_error_stack_pos;
  39 static int grub_error_stack_assert;
  40
  41 grub_err_t
  42 grub_error (grub_err_t n, const char *fmt, ...)
  43 {
  44   va_list ap;
  45
  46   grub_errno = n;
  47
  48   va_start (ap, fmt);
  49   grub_vsnprintf (grub_errmsg, sizeof (grub_errmsg), _(fmt), ap);
  50   va_end (ap);
  51
  52   return n;
  53 }
  54
  55 void
  56 grub_fatal (const char *fmt, ...)
  57 {
  58   va_list ap;
  59
  60   va_start (ap, fmt);
  61   grub_vprintf (_(fmt), ap);
  62   va_end (ap);
  63
  64   grub_abort ();
  65 }
  66
  67 void
  68 grub_error_push (void)
  69 {
  70   /* Only add items to stack, if there is enough room.  */
  71   if (grub_error_stack_pos < GRUB_ERROR_STACK_SIZE)
  72     {
  73       /* Copy active error message to stack.  */
  74       grub_error_stack_items[grub_error_stack_pos].errno = grub_errno;
  75       grub_memcpy (grub_error_stack_items[grub_error_stack_pos].errmsg,
  76                    grub_errmsg,
  77                    sizeof (grub_errmsg));
  78
  79       /* Advance to next error stack position.  */
  80       grub_error_stack_pos++;
  81     }
  82   else
  83     {
  84       /* There is no room for new error message. Discard new error message
  85          and mark error stack assertion flag.  */
  86       grub_error_stack_assert = 1;
  87     }
  88
  89   /* Allow further operation of other components by resetting
  90      active errno to GRUB_ERR_NONE.  */
  91   grub_errno = GRUB_ERR_NONE;
  92 }
  93
  94 int
  95 grub_error_pop (void)
  96 {
  97   if (grub_error_stack_pos > 0)
  98     {
  99       /* Pop error message from error stack to current active error.  */
 100       grub_error_stack_pos--;
 101
 102       grub_errno = grub_error_stack_items[grub_error_stack_pos].errno;
 103       grub_memcpy (grub_errmsg,
 104                    grub_error_stack_items[grub_error_stack_pos].errmsg,
 105                    sizeof (grub_errmsg));
 106
 107       return 1;
 108     }
 109   else
 110     {
 111       /* There is no more items on error stack, reset to no error state.  */
 112       grub_errno = GRUB_ERR_NONE;
 113
 114       return 0;
 115     }
 116 }
 117
 118 void
 119 grub_print_error (void)
 120 {
 121   /* Print error messages in reverse order. First print active error message
 122      and then empty error stack.  */
 123   do
 124     {
 125       if (grub_errno != GRUB_ERR_NONE)
 126         {
 127           grub_err_printf (_("error: %s.\n"), grub_errmsg);
 128           grub_err_printed_errors++;
 129         }
 130     }
 131   while (grub_error_pop ());
 132
 133   /* If there was an assert while using error stack, report about it.  */
 134   if (grub_error_stack_assert)
 135     {
 136       grub_err_printf ("assert: error stack overflow detected!\n");
 137       grub_error_stack_assert = 0;
 138     }
 139 }