libcpp/errors.c

   1 /* Default error handlers for CPP Library.
   2    Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, 1999, 2000,
   3    2001, 2002, 2004, 2008 Free Software Foundation, Inc.
   4    Written by Per Bothner, 1994.
   5    Based on CCCP program by Paul Rubin, June 1986
   6    Adapted to ANSI C, Richard Stallman, Jan 1987
   7
   8 This program is free software; you can redistribute it and/or modify it
   9 under the terms of the GNU General Public License as published by the
  10 Free Software Foundation; either version 2, or (at your option) any
  11 later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21
  22  In other words, you are welcome to use, share and improve this program.
  23  You are forbidden to forbid anyone else to use, share and improve
  24  what you give them.   Help stamp out software-hoarding!  */
  25
  26 #include "config.h"
  27 #include "system.h"
  28 #include "cpplib.h"
  29 #include "internal.h"
  30
  31 static void print_location (cpp_reader *, source_location, unsigned int);
  32
  33 /* Print the logical file location (LINE, COL) in preparation for a
  34    diagnostic.  Outputs the #include chain if it has changed.  A line
  35    of zero suppresses the include stack, and outputs the program name
  36    instead.  */
  37 static void
  38 print_location (cpp_reader *pfile, source_location line, unsigned int col)
  39 {
  40   if (line == 0)
  41     fprintf (stderr, "%s: ", progname);
  42   else
  43     {
  44       const struct line_map *map;
  45       linenum_type lin;
  46
  47       map = linemap_lookup (pfile->line_table, line);
  48       linemap_print_containing_files (pfile->line_table, map);
  49
  50       lin = SOURCE_LINE (map, line);
  51       if (col == 0)
  52         {
  53           col = SOURCE_COLUMN (map, line);
  54           if (col == 0)
  55             col = 1;
  56         }
  57
  58       if (lin == 0)
  59         fprintf (stderr, "%s:", map->to_file);
  60       else if (CPP_OPTION (pfile, show_column) == 0)
  61         fprintf (stderr, "%s:%u:", map->to_file, lin);
  62       else
  63         fprintf (stderr, "%s:%u:%u:", map->to_file, lin, col);
  64
  65       fputc (' ', stderr);
  66     }
  67 }
  68
  69 /* Set up for a diagnostic: print the file and line, bump the error
  70    counter, etc.  SRC_LOC is the logical line number; zero means to print
  71    at the location of the previously lexed token, which tends to be
  72    the correct place by default.  The column number can be specified either
  73    using COLUMN or (if COLUMN==0) extracting SOURCE_COLUMN from SRC_LOC.
  74    (This may seem redundant, but is useful when pre-scanning (cleaning) a line,
  75    when we haven't yet verified whether the current line_map has a
  76    big enough max_column_hint.)
  77
  78    Returns 0 if the error has been suppressed.  */
  79 static int
  80 _cpp_begin_message (cpp_reader *pfile, int code,
  81                     source_location src_loc, unsigned int column)
  82 {
  83   int level = CPP_DL_EXTRACT (code);
  84
  85   switch (level)
  86     {
  87     case CPP_DL_WARNING:
  88     case CPP_DL_PEDWARN:
  89       if (cpp_in_system_header (pfile)
  90           && ! CPP_OPTION (pfile, warn_system_headers))
  91         return 0;
  92       /* Fall through.  */
  93
  94     case CPP_DL_WARNING_SYSHDR:
  95       if (CPP_OPTION (pfile, warnings_are_errors)
  96           || (level == CPP_DL_PEDWARN && CPP_OPTION (pfile, pedantic_errors)))
  97         {
  98           if (CPP_OPTION (pfile, inhibit_errors))
  99             return 0;
 100           level = CPP_DL_ERROR;
 101           pfile->errors++;
 102         }
 103       else if (CPP_OPTION (pfile, inhibit_warnings))
 104         return 0;
 105       break;
 106
 107     case CPP_DL_ERROR:
 108       if (CPP_OPTION (pfile, inhibit_errors))
 109         return 0;
 110       /* ICEs cannot be inhibited.  */
 111     case CPP_DL_ICE:
 112       pfile->errors++;
 113       break;
 114     }
 115
 116   print_location (pfile, src_loc, column);
 117   if (CPP_DL_WARNING_P (level))
 118     fputs (_("warning: "), stderr);
 119   else if (level == CPP_DL_ICE)
 120     fputs (_("internal error: "), stderr);
 121   else
 122     fputs (_("error: "), stderr);
 123
 124   return 1;
 125 }
 126
 127 /* Don't remove the blank before do, as otherwise the exgettext
 128    script will mistake this as a function definition */
 129 #define v_message(msgid, ap) \
 130  do { vfprintf (stderr, _(msgid), ap); putc ('\n', stderr); } while (0)
 131
 132 /* Exported interface.  */
 133
 134 /* Print an error at the location of the previously lexed token.  */
 135 void
 136 cpp_error (cpp_reader * pfile, int level, const char *msgid, ...)
 137 {
 138   source_location src_loc;
 139   va_list ap;
 140
 141   va_start (ap, msgid);
 142
 143   if (CPP_OPTION (pfile, client_diagnostic))
 144     pfile->cb.error (pfile, level, _(msgid), &ap);
 145   else
 146     {
 147       if (CPP_OPTION (pfile, traditional))
 148         {
 149           if (pfile->state.in_directive)
 150             src_loc = pfile->directive_line;
 151           else
 152             src_loc = pfile->line_table->highest_line;
 153         }
 154       /* We don't want to refer to a token before the beginning of the
 155          current run -- that is invalid.  */
 156       else if (pfile->cur_token == pfile->cur_run->base)
 157         {
 158           if (pfile->cur_run->prev != NULL)
 159             src_loc = pfile->cur_run->prev->limit->src_loc;
 160           else
 161             src_loc = 0;
 162         }
 163       else
 164         {
 165           src_loc = pfile->cur_token[-1].src_loc;
 166         }
 167
 168       if (_cpp_begin_message (pfile, level, src_loc, 0))
 169         v_message (msgid, ap);
 170     }
 171
 172   va_end (ap);
 173 }
 174
 175 /* Print an error at a specific location.  */
 176 void
 177 cpp_error_with_line (cpp_reader *pfile, int level,
 178                      source_location src_loc, unsigned int column,
 179                      const char *msgid, ...)
 180 {
 181   va_list ap;
 182
 183   va_start (ap, msgid);
 184
 185   if (_cpp_begin_message (pfile, level, src_loc, column))
 186     v_message (msgid, ap);
 187
 188   va_end (ap);
 189 }
 190
 191 void
 192 cpp_errno (cpp_reader *pfile, int level, const char *msgid)
 193 {
 194   if (msgid[0] == '\0')
 195     msgid = _("stdout");
 196
 197   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 198 }