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, 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       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   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, traditional))
 144     {
 145       if (pfile->state.in_directive)
 146         src_loc = pfile->directive_line;
 147       else
 148         src_loc = pfile->line_table->highest_line;
 149     }
 150   else
 151     {
 152       src_loc = pfile->cur_token[-1].src_loc;
 153     }
 154
 155   if (_cpp_begin_message (pfile, level, src_loc, 0))
 156     v_message (msgid, ap);
 157
 158   va_end (ap);
 159 }
 160
 161 /* Print an error at a specific location.  */
 162 void
 163 cpp_error_with_line (cpp_reader *pfile, int level,
 164                      source_location src_loc, unsigned int column,
 165                      const char *msgid, ...)
 166 {
 167   va_list ap;
 168
 169   va_start (ap, msgid);
 170
 171   if (_cpp_begin_message (pfile, level, src_loc, column))
 172     v_message (msgid, ap);
 173
 174   va_end (ap);
 175 }
 176
 177 void
 178 cpp_errno (cpp_reader *pfile, int level, const char *msgid)
 179 {
 180   if (msgid[0] == '\0')
 181     msgid = _("stdout");
 182
 183   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 184 }