src/complain.c

   1 /* Declaration for error-reporting function for Bison.
   2
   3    Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2009
   4    Free Software Foundation, Inc.
   5
   6    This program 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    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* Based on error.c and error.h,
  20    written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  21
  22 #include <config.h>
  23 #include "system.h"
  24
  25 #include <stdarg.h>
  26
  27 #include "complain.h"
  28 #include "files.h"
  29 #include "getargs.h"
  30
  31 bool complaint_issued;
  32
  33 \f
  34
  35 /** Report an error message.
  36  *
  37  * \param loc     the location, defaulting to the current file,
  38  *                or the program name.
  39  * \param prefix  put before the message (e.g., "warning").
  40  * \param message the error message, a printf format string.
  41  * \param args    the arguments of the format string.
  42  */
  43 static
  44 void
  45 error_message (location *loc,
  46                const char *prefix,
  47                const char *message, va_list args)
  48 {
  49   if (loc)
  50     location_print (stderr, *loc);
  51   else
  52     fputs (current_file ? current_file : program_name, stderr);
  53   fputs (": ", stderr);
  54
  55   if (prefix)
  56     fprintf (stderr, "%s: ", prefix);
  57
  58   vfprintf (stderr, message, args);
  59   va_end (args);
  60   putc ('\n', stderr);
  61   fflush (stderr);
  62 }
  63
  64 /** Wrap error_message() with varargs handling. */
  65 #define ERROR_MESSAGE(Loc, Prefix, Message)     \
  66 {                                               \
  67   va_list args;                                 \
  68   va_start (args, Message);                     \
  69   error_message (Loc, Prefix, Message, args);   \
  70 }
  71
  72
  73 /*--------------------------------.
  74 | Report a warning, and proceed.  |
  75 `--------------------------------*/
  76
  77 static void
  78 set_warning_issued (void)
  79 {
  80   static bool warning_issued = false;
  81   if (!warning_issued && (warnings_flag & warnings_error))
  82     {
  83       fprintf (stderr, "%s: warnings being treated as errors\n", program_name);
  84       complaint_issued = true;
  85     }
  86   warning_issued = true;
  87 }
  88
  89 void
  90 warn_at (location loc, const char *message, ...)
  91 {
  92   set_warning_issued ();
  93   ERROR_MESSAGE (&loc, _("warning"), message);
  94 }
  95
  96 void
  97 warn (const char *message, ...)
  98 {
  99   set_warning_issued ();
 100   ERROR_MESSAGE (NULL, _("warning"), message);
 101 }
 102
 103
 104 /*-----------------------------------------------------------.
 105 | An error has occurred, but we can proceed, and die later.  |
 106 `-----------------------------------------------------------*/
 107
 108 void
 109 complain_at (location loc, const char *message, ...)
 110 {
 111   ERROR_MESSAGE (&loc, NULL, message);
 112   complaint_issued = true;
 113 }
 114
 115 void
 116 complain (const char *message, ...)
 117 {
 118   ERROR_MESSAGE (NULL, NULL, message);
 119   complaint_issued = true;
 120 }
 121
 122
 123 /*--------------------------------------------------------------.
 124 | An incompatibility with POSIX Yacc: mapped either to warn* or |
 125 | complain* depending on yacc_flag.                             |
 126 `--------------------------------------------------------------*/
 127
 128 void
 129 yacc_at (location loc, const char *message, ...)
 130 {
 131   if (yacc_flag)
 132     {
 133       ERROR_MESSAGE (&loc, NULL, message);
 134       complaint_issued = true;
 135     }
 136   else if (warnings_flag & warnings_yacc)
 137     {
 138       set_warning_issued ();
 139       ERROR_MESSAGE (&loc, _("warning"), message);
 140     }
 141 }
 142
 143
 144 /*-------------------------------------------------.
 145 | A severe error has occurred, we cannot proceed.  |
 146 `-------------------------------------------------*/
 147
 148 void
 149 fatal_at (location loc, const char *message, ...)
 150 {
 151   ERROR_MESSAGE (&loc, _("fatal error"), message);
 152   exit (EXIT_FAILURE);
 153 }
 154
 155 void
 156 fatal (const char *message, ...)
 157 {
 158   ERROR_MESSAGE (NULL, _("fatal error"), message);
 159   exit (EXIT_FAILURE);
 160 }