src/complain.c

   1 /* Declaration for error-reporting function for Bison.
   2
   3    Copyright (C) 2000-2002, 2004-2006, 2009-2012 Free Software
   4    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 #include <progname.h>
  27
  28 #include "complain.h"
  29 #include "files.h"
  30 #include "getargs.h"
  31
  32 bool complaint_issued;
  33 static unsigned *indent_ptr = 0;
  34
  35 \f
  36
  37 /** Report an error message.
  38  *
  39  * \param loc     the location, defaulting to the current file,
  40  *                or the program name.
  41  * \param prefix  put before the message (e.g., "warning").
  42  * \param message the error message, a printf format string.  Iff it
  43  *                ends with ": ", then no trailing newline is printed,
  44  *                and the caller should print the remaining
  45  *                newline-terminated message to stderr.
  46  * \param args    the arguments of the format string.
  47  */
  48 static
  49 void
  50 error_message (location *loc,
  51                const char *prefix,
  52                const char *message, va_list args)
  53 {
  54   unsigned pos = 0;
  55
  56   if (loc)
  57     pos += location_print (stderr, *loc);
  58   else
  59     pos += fprintf(stderr, "%s", current_file ? current_file : program_name);
  60   pos += fprintf(stderr, ": ");
  61
  62   if (indent_ptr)
  63     {
  64       if (!*indent_ptr)
  65         *indent_ptr = pos;
  66       else if (*indent_ptr > pos)
  67         fprintf (stderr, "%*s", *indent_ptr - pos, "");
  68       indent_ptr = 0;
  69     }
  70
  71   if (prefix)
  72     fprintf (stderr, "%s: ", prefix);
  73
  74   vfprintf (stderr, message, args);
  75   {
  76     size_t l = strlen (message);
  77     if (l < 2 || message[l-2] != ':' || message[l-1] != ' ') {
  78       putc ('\n', stderr);
  79       fflush (stderr);
  80     }
  81   }
  82 }
  83
  84 /** Wrap error_message() with varargs handling. */
  85 #define ERROR_MESSAGE(Loc, Prefix, Message)     \
  86 {                                               \
  87   va_list args;                                 \
  88   va_start (args, Message);                     \
  89   error_message (Loc, Prefix, Message, args);   \
  90   va_end (args);                                \
  91 }
  92
  93
  94 /*--------------------------------.
  95 | Report a warning, and proceed.  |
  96 `--------------------------------*/
  97
  98 void
  99 set_warning_issued (void)
 100 {
 101   static bool warning_issued = false;
 102   if (!warning_issued && (warnings_flag & warnings_error))
 103     {
 104       fprintf (stderr, "%s: warnings being treated as errors\n", program_name);
 105       complaint_issued = true;
 106     }
 107   warning_issued = true;
 108 }
 109
 110 void
 111 warn_at (location loc, const char *message, ...)
 112 {
 113   if (!(warnings_flag & warnings_other))
 114     return;
 115   set_warning_issued ();
 116   ERROR_MESSAGE (&loc, _("warning"), message);
 117 }
 118
 119 void
 120 warn_at_indent (location loc, unsigned *indent,
 121                 const char *message, ...)
 122 {
 123   if (!(warnings_flag & warnings_other))
 124     return;
 125   set_warning_issued ();
 126   indent_ptr = indent;
 127   ERROR_MESSAGE (&loc, *indent ? NULL : _("warning"), message);
 128 }
 129
 130 void
 131 warn (const char *message, ...)
 132 {
 133   if (!(warnings_flag & warnings_other))
 134     return;
 135   set_warning_issued ();
 136   ERROR_MESSAGE (NULL, _("warning"), message);
 137 }
 138
 139
 140 /*-----------------------------------------------------------.
 141 | An error has occurred, but we can proceed, and die later.  |
 142 `-----------------------------------------------------------*/
 143
 144 void
 145 complain_at (location loc, const char *message, ...)
 146 {
 147   ERROR_MESSAGE (&loc, _("error"), message);
 148   complaint_issued = true;
 149 }
 150
 151 void
 152 complain_at_indent (location loc, unsigned *indent,
 153                     const char *message, ...)
 154 {
 155   indent_ptr = indent;
 156   ERROR_MESSAGE (&loc, *indent ? NULL : _("error"), message);
 157   complaint_issued = true;
 158 }
 159
 160 void
 161 complain (const char *message, ...)
 162 {
 163   ERROR_MESSAGE (NULL, _("error"), message);
 164   complaint_issued = true;
 165 }
 166
 167
 168 /*--------------------------------------------------------------.
 169 | An incompatibility with POSIX Yacc: mapped either to warn* or |
 170 | complain* depending on yacc_flag.                             |
 171 `--------------------------------------------------------------*/
 172
 173 void
 174 yacc_at (location loc, const char *message, ...)
 175 {
 176   if (yacc_flag)
 177     {
 178       ERROR_MESSAGE (&loc, NULL, message);
 179       complaint_issued = true;
 180     }
 181   else if (warnings_flag & warnings_yacc)
 182     {
 183       set_warning_issued ();
 184       ERROR_MESSAGE (&loc, _("warning"), message);
 185     }
 186 }
 187
 188 void
 189 midrule_value_at (location loc, const char *message, ...)
 190 {
 191   if (!(warnings_flag & warnings_midrule_values))
 192     return;
 193   set_warning_issued ();
 194   ERROR_MESSAGE (&loc, _("warning"), message);
 195 }
 196
 197 /*-------------------------------------------------.
 198 | A severe error has occurred, we cannot proceed.  |
 199 `-------------------------------------------------*/
 200
 201 void
 202 fatal_at (location loc, const char *message, ...)
 203 {
 204   ERROR_MESSAGE (&loc, _("fatal error"), message);
 205   exit (EXIT_FAILURE);
 206 }
 207
 208 void
 209 fatal (const char *message, ...)
 210 {
 211   ERROR_MESSAGE (NULL, _("fatal error"), message);
 212   exit (EXIT_FAILURE);
 213 }