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 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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       unsigned int 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 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
 122   return 1;
 123 }
 124
 125 /* Don't remove the blank before do, as otherwise the exgettext
 126    script will mistake this as a function definition */
 127 #define v_message(msgid, ap) \
 128  do { vfprintf (stderr, _(msgid), ap); putc ('\n', stderr); } while (0)
 129
 130 /* Exported interface.  */
 131
 132 /* Print an error at the location of the previously lexed token.  */
 133 void
 134 cpp_error (cpp_reader * pfile, int level, const char *msgid, ...)
 135 {
 136   source_location src_loc;
 137   va_list ap;
 138
 139   va_start (ap, msgid);
 140
 141   if (CPP_OPTION (pfile, traditional))
 142     {
 143       if (pfile->state.in_directive)
 144         src_loc = pfile->directive_line;
 145       else
 146         src_loc = pfile->line_table->highest_line;
 147     }
 148   else
 149     {
 150       src_loc = pfile->cur_token[-1].src_loc;
 151     }
 152
 153   if (_cpp_begin_message (pfile, level, src_loc, 0))
 154     v_message (msgid, ap);
 155
 156   va_end (ap);
 157 }
 158
 159 /* Print an error at a specific location.  */
 160 void
 161 cpp_error_with_line (cpp_reader *pfile, int level,
 162                      source_location src_loc, unsigned int column,
 163                      const char *msgid, ...)
 164 {
 165   va_list ap;
 166
 167   va_start (ap, msgid);
 168
 169   if (_cpp_begin_message (pfile, level, src_loc, column))
 170     v_message (msgid, ap);
 171
 172   va_end (ap);
 173 }
 174
 175 void
 176 cpp_errno (cpp_reader *pfile, int level, const char *msgid)
 177 {
 178   if (msgid[0] == '\0')
 179     msgid = _("stdout");
 180
 181   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 182 }