libguile/error.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 #ifdef HAVE_UNISTD_H
  47 #include <unistd.h>
  48 #endif
  49 \f
  50
  51 \f
  52 /* {Errors and Exceptional Conditions}
  53  */
  54
  55 SCM system_error_sym;
  56
  57 /* True between SCM_DEFER_INTS and SCM_ALLOW_INTS, and
  58  * when the interpreter is not running at all.
  59  */
  60 int scm_ints_disabled = 1;
  61
  62
  63 extern int errno;
  64 #ifdef __STDC__
  65 static void
  66 err_head (char *str)
  67 #else
  68 static void
  69 err_head (str)
  70      char *str;
  71 #endif
  72 {
  73   int oerrno = errno;
  74   if (SCM_NIMP (scm_cur_outp))
  75     scm_fflush (scm_cur_outp);
  76   scm_gen_putc ('\n', scm_cur_errp);
  77 #if 0
  78   if (SCM_BOOL_F != *scm_loc_loadpath)
  79     {
  80       scm_iprin1 (*scm_loc_loadpath, scm_cur_errp, 1);
  81       scm_gen_puts (scm_regular_string, ", line ", scm_cur_errp);
  82       scm_intprint ((long) scm_linum, 10, scm_cur_errp);
  83       scm_gen_puts (scm_regular_string, ": ", scm_cur_errp);
  84     }
  85 #endif
  86   scm_fflush (scm_cur_errp);
  87   errno = oerrno;
  88   if (scm_cur_errp == scm_def_errp)
  89     {
  90       if (errno > 0)
  91         perror (str);
  92       fflush (stderr);
  93       return;
  94     }
  95 }
  96
  97
  98 SCM_PROC(s_errno, "errno", 0, 1, 0, scm_errno);
  99 #ifdef __STDC__
 100 SCM
 101 scm_errno (SCM arg)
 102 #else
 103 SCM
 104 scm_errno (arg)
 105      SCM arg;
 106 #endif
 107 {
 108   int old = errno;
 109   if (!SCM_UNBNDP (arg))
 110     {
 111       if (SCM_FALSEP (arg))
 112         errno = 0;
 113       else
 114         errno = SCM_INUM (arg);
 115     }
 116   return SCM_MAKINUM (old);
 117 }
 118
 119 SCM_PROC(s_perror, "perror", 1, 0, 0, scm_perror);
 120 #ifdef __STDC__
 121 SCM
 122 scm_perror (SCM arg)
 123 #else
 124 SCM
 125 scm_perror (arg)
 126      SCM arg;
 127 #endif
 128 {
 129   SCM_ASSERT (SCM_NIMP (arg) && SCM_STRINGP (arg), arg, SCM_ARG1, s_perror);
 130   err_head (SCM_CHARS (arg));
 131   return SCM_UNSPECIFIED;
 132 }
 133
 134
 135 #ifdef __STDC__
 136 void
 137 scm_everr (SCM exp, SCM env, SCM arg, char *pos, char *s_subr)
 138 #else
 139 void
 140 scm_everr (exp, env, arg, pos, s_subr)
 141      SCM exp;
 142      SCM env;
 143      SCM arg;
 144      char *pos;
 145      char *s_subr;
 146 #endif
 147 {
 148   SCM desc;
 149   SCM args;
 150
 151   if ((~0x1fL) & (long) pos)
 152     desc = scm_makfrom0str (pos);
 153   else
 154     desc = SCM_MAKINUM ((long)pos);
 155
 156   {
 157     SCM sym;
 158     if (!s_subr || !*s_subr)
 159       sym = SCM_BOOL_F;
 160     else
 161       sym = SCM_CAR (scm_intern0 (s_subr));
 162     args = scm_listify (desc, sym, arg, SCM_UNDEFINED);
 163   }
 164
 165   /* (throw (quote %%system-error) <desc> <proc-name> arg)
 166    *
 167    * <desc> is a string or an integer (see %%system-errors).
 168    * <proc-name> is a symbol or #f in some annoying cases (e.g. cddr).
 169    */
 170
 171   scm_ithrow (system_error_sym, args, 1);
 172
 173   /* No return, but just in case: */
 174
 175   write (2, "unhandled system error", sizeof ("unhandled system error"));
 176   exit (1);
 177 }
 178
 179 #ifdef __STDC__
 180 SCM
 181 scm_wta (SCM arg, char *pos, char *s_subr)
 182 #else
 183 SCM
 184 scm_wta (arg, pos, s_subr)
 185      SCM arg;
 186      char *pos;
 187      char *s_subr;
 188 #endif
 189 {
 190   scm_everr (SCM_UNDEFINED, SCM_EOL, arg, pos, s_subr);
 191   return SCM_UNSPECIFIED;
 192 }
 193
 194
 195
 196 #ifdef __STDC__
 197 void
 198 scm_init_error (void)
 199 #else
 200 void
 201 scm_init_error ()
 202 #endif
 203 {
 204   system_error_sym = SCM_CAR (scm_intern0 ("%%system-error"));
 205   scm_permanent_object (system_error_sym);
 206 #include "error.x"
 207 }
 208