libcpp/errors.c

   1 /* Default error handlers for CPP Library.
   2    Copyright (C) 1986-2016 Free Software Foundation, Inc.
   3    Written by Per Bothner, 1994.
   4    Based on CCCP program by Paul Rubin, June 1986
   5    Adapted to ANSI C, Richard Stallman, Jan 1987
   6
   7 This program 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 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.
  20
  21  In other words, you are welcome to use, share and improve this program.
  22  You are forbidden to forbid anyone else to use, share and improve
  23  what you give them.   Help stamp out software-hoarding!  */
  24
  25 #include "config.h"
  26 #include "system.h"
  27 #include "cpplib.h"
  28 #include "internal.h"
  29
  30 /* Print a diagnostic at the location of the previously lexed token.  */
  31
  32 ATTRIBUTE_FPTR_PRINTF(4,0)
  33 static bool
  34 cpp_diagnostic (cpp_reader * pfile, int level, int reason,
  35                 const char *msgid, va_list *ap)
  36 {
  37   source_location src_loc;
  38   bool ret;
  39
  40   if (CPP_OPTION (pfile, traditional))
  41     {
  42       if (pfile->state.in_directive)
  43         src_loc = pfile->directive_line;
  44       else
  45         src_loc = pfile->line_table->highest_line;
  46     }
  47   /* We don't want to refer to a token before the beginning of the
  48      current run -- that is invalid.  */
  49   else if (pfile->cur_token == pfile->cur_run->base)
  50     {
  51       src_loc = 0;
  52     }
  53   else
  54     {
  55       src_loc = pfile->cur_token[-1].src_loc;
  56     }
  57
  58   if (!pfile->cb.error)
  59     abort ();
  60   rich_location richloc (pfile->line_table, src_loc);
  61   ret = pfile->cb.error (pfile, level, reason, &richloc, _(msgid), ap);
  62
  63   return ret;
  64 }
  65
  66 /* Print a warning or error, depending on the value of LEVEL.  */
  67
  68 bool
  69 cpp_error (cpp_reader * pfile, int level, const char *msgid, ...)
  70 {
  71   va_list ap;
  72   bool ret;
  73
  74   va_start (ap, msgid);
  75
  76   ret = cpp_diagnostic (pfile, level, CPP_W_NONE, msgid, &ap);
  77
  78   va_end (ap);
  79   return ret;
  80 }
  81
  82 /* Print a warning.  The warning reason may be given in REASON.  */
  83
  84 bool
  85 cpp_warning (cpp_reader * pfile, int reason, const char *msgid, ...)
  86 {
  87   va_list ap;
  88   bool ret;
  89
  90   va_start (ap, msgid);
  91
  92   ret = cpp_diagnostic (pfile, CPP_DL_WARNING, reason, msgid, &ap);
  93
  94   va_end (ap);
  95   return ret;
  96 }
  97
  98 /* Print a pedantic warning.  The warning reason may be given in REASON.  */
  99
 100 bool
 101 cpp_pedwarning (cpp_reader * pfile, int reason, const char *msgid, ...)
 102 {
 103   va_list ap;
 104   bool ret;
 105
 106   va_start (ap, msgid);
 107
 108   ret = cpp_diagnostic (pfile, CPP_DL_PEDWARN, reason, msgid, &ap);
 109
 110   va_end (ap);
 111   return ret;
 112 }
 113
 114 /* Print a warning, including system headers.  The warning reason may be
 115    given in REASON.  */
 116
 117 bool
 118 cpp_warning_syshdr (cpp_reader * pfile, int reason, const char *msgid, ...)
 119 {
 120   va_list ap;
 121   bool ret;
 122
 123   va_start (ap, msgid);
 124
 125   ret = cpp_diagnostic (pfile, CPP_DL_WARNING_SYSHDR, reason, msgid, &ap);
 126
 127   va_end (ap);
 128   return ret;
 129 }
 130
 131 /* Print a diagnostic at a specific location.  */
 132
 133 ATTRIBUTE_FPTR_PRINTF(6,0)
 134 static bool
 135 cpp_diagnostic_with_line (cpp_reader * pfile, int level, int reason,
 136                           source_location src_loc, unsigned int column,
 137                           const char *msgid, va_list *ap)
 138 {
 139   bool ret;
 140
 141   if (!pfile->cb.error)
 142     abort ();
 143   rich_location richloc (pfile->line_table, src_loc);
 144   if (column)
 145     richloc.override_column (column);
 146   ret = pfile->cb.error (pfile, level, reason, &richloc, _(msgid), ap);
 147
 148   return ret;
 149 }
 150
 151 /* Print a warning or error, depending on the value of LEVEL.  */
 152
 153 bool
 154 cpp_error_with_line (cpp_reader *pfile, int level,
 155                      source_location src_loc, unsigned int column,
 156                      const char *msgid, ...)
 157 {
 158   va_list ap;
 159   bool ret;
 160
 161   va_start (ap, msgid);
 162
 163   ret = cpp_diagnostic_with_line (pfile, level, CPP_W_NONE, src_loc,
 164                                   column, msgid, &ap);
 165
 166   va_end (ap);
 167   return ret;
 168 }
 169
 170 /* Print a warning.  The warning reason may be given in REASON.  */
 171
 172 bool
 173 cpp_warning_with_line (cpp_reader *pfile, int reason,
 174                        source_location src_loc, unsigned int column,
 175                        const char *msgid, ...)
 176 {
 177   va_list ap;
 178   bool ret;
 179
 180   va_start (ap, msgid);
 181
 182   ret = cpp_diagnostic_with_line (pfile, CPP_DL_WARNING, reason, src_loc,
 183                                   column, msgid, &ap);
 184
 185   va_end (ap);
 186   return ret;
 187 }
 188
 189 /* Print a pedantic warning.  The warning reason may be given in REASON.  */
 190
 191 bool
 192 cpp_pedwarning_with_line (cpp_reader *pfile, int reason,
 193                           source_location src_loc, unsigned int column,
 194                           const char *msgid, ...)
 195 {
 196   va_list ap;
 197   bool ret;
 198
 199   va_start (ap, msgid);
 200
 201   ret = cpp_diagnostic_with_line (pfile, CPP_DL_PEDWARN, reason, src_loc,
 202                                   column, msgid, &ap);
 203
 204   va_end (ap);
 205   return ret;
 206 }
 207
 208 /* Print a warning, including system headers.  The warning reason may be
 209    given in REASON.  */
 210
 211 bool
 212 cpp_warning_with_line_syshdr (cpp_reader *pfile, int reason,
 213                               source_location src_loc, unsigned int column,
 214                               const char *msgid, ...)
 215 {
 216   va_list ap;
 217   bool ret;
 218
 219   va_start (ap, msgid);
 220
 221   ret = cpp_diagnostic_with_line (pfile, CPP_DL_WARNING_SYSHDR, reason, src_loc,
 222                                   column, msgid, &ap);
 223
 224   va_end (ap);
 225   return ret;
 226 }
 227
 228 /* Print a warning or error, depending on the value of LEVEL.  Include
 229    information from errno.  */
 230
 231 bool
 232 cpp_errno (cpp_reader *pfile, int level, const char *msgid)
 233 {
 234   return cpp_error (pfile, level, "%s: %s", _(msgid), xstrerror (errno));
 235 }
 236
 237 /* Print a warning or error, depending on the value of LEVEL.  Include
 238    information from errno.  Unlike cpp_errno, the argument is a filename
 239    that is not localized, but "" is replaced with localized "stdout".  */
 240
 241 bool
 242 cpp_errno_filename (cpp_reader *pfile, int level, const char *filename)
 243 {
 244   if (filename[0] == '\0')
 245     filename = _("stdout");
 246
 247   return cpp_error (pfile, level, "%s: %s", filename, xstrerror (errno));
 248 }