libobjc/error.c

   1 /* GNU Objective C Runtime Error Functions
   2    Copyright (C) 1993, 1994, 1995, 1996, 1997, 2002, 2009, 2010
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it
   8 under the terms of the GNU General Public License as published by the
   9 Free Software Foundation; either version 3, or (at your option) any
  10 later version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT
  13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "objc-private/common.h"
  27 #include "objc-private/error.h"
  28
  29 /* __USE_FIXED_PROTOTYPES__ used to be required to get prototypes for
  30    malloc, free, etc. on some platforms.  It is unclear if we still
  31    need it, but it can't hurt.  */
  32 #define __USE_FIXED_PROTOTYPES__
  33 #include <stdlib.h>
  34 #include <stdio.h>
  35 #include <stdarg.h>
  36
  37 /* Prints an error message and aborts the program.  */
  38 void
  39 _objc_abort (const char *fmt, ...)
  40 {
  41   va_list ap;
  42
  43   va_start (ap, fmt);
  44   vfprintf (stderr, fmt, ap);
  45   abort ();
  46   va_end (ap);
  47 }
  48
  49 /* The rest of the file is deprecated.  */
  50 #include "objc/objc-api.h" /* For objc_error_handler.  */
  51
  52 /*
  53 ** Error handler function
  54 ** NULL so that default is to just print to stderr
  55 */
  56 static objc_error_handler _objc_error_handler = NULL;
  57
  58 /* Trigger an objc error */
  59 void
  60 objc_error (id object, int code, const char *fmt, ...)
  61 {
  62   va_list ap;
  63
  64   va_start (ap, fmt);
  65   objc_verror (object, code, fmt, ap);
  66   va_end (ap);
  67 }
  68
  69 /* Trigger an objc error */
  70 void
  71 objc_verror (id object, int code, const char *fmt, va_list ap)
  72 {
  73   BOOL result = NO;
  74
  75   /* Call the error handler if its there
  76      Otherwise print to stderr */
  77   if (_objc_error_handler)
  78     result = (*_objc_error_handler) (object, code, fmt, ap);
  79   else
  80     vfprintf (stderr, fmt, ap);
  81
  82   /* Continue if the error handler says its ok
  83      Otherwise abort the program */
  84   if (result)
  85     return;
  86   else
  87     abort ();
  88 }
  89
  90 /* Set the error handler */
  91 objc_error_handler
  92 objc_set_error_handler (objc_error_handler func)
  93 {
  94   objc_error_handler temp = _objc_error_handler;
  95   _objc_error_handler = func;
  96   return temp;
  97 }