src/location.c

   1 /* Locations for Bison
   2
   3    Copyright (C) 2002, 2005, 2006, 2007, 2008, 2009, 2010 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include <mbswidth.h>
  25 #include <quotearg.h>
  26
  27 #include "complain.h"
  28 #include "location.h"
  29
  30 location const empty_location = EMPTY_LOCATION_INIT;
  31
  32 /* If BUF is null, add BUFSIZE (which in this case must be less than
  33    INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to
  34    COLUMN.  If an overflow occurs, or might occur but is undetectable,
  35    return INT_MAX.  Assume COLUMN is nonnegative.  */
  36
  37 static inline int
  38 add_column_width (int column, char const *buf, size_t bufsize)
  39 {
  40   size_t width;
  41   unsigned int remaining_columns = INT_MAX - column;
  42
  43   if (buf)
  44     {
  45       if (INT_MAX / 2 <= bufsize)
  46         return INT_MAX;
  47       width = mbsnwidth (buf, bufsize, 0);
  48     }
  49   else
  50     width = bufsize;
  51
  52   return width <= remaining_columns ? column + width : INT_MAX;
  53 }
  54
  55 /* Set *LOC and adjust scanner cursor to account for token TOKEN of
  56    size SIZE.  */
  57
  58 void
  59 location_compute (location *loc, boundary *cur, char const *token, size_t size)
  60 {
  61   int line = cur->line;
  62   int column = cur->column;
  63   char const *p0 = token;
  64   char const *p = token;
  65   char const *lim = token + size;
  66
  67   loc->start = *cur;
  68
  69   for (p = token; p < lim; p++)
  70     switch (*p)
  71       {
  72       case '\n':
  73         line += line < INT_MAX;
  74         column = 1;
  75         p0 = p + 1;
  76         break;
  77
  78       case '\t':
  79         column = add_column_width (column, p0, p - p0);
  80         column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
  81         p0 = p + 1;
  82         break;
  83
  84       default:
  85         break;
  86       }
  87
  88   cur->line = line;
  89   cur->column = column = add_column_width (column, p0, p - p0);
  90
  91   loc->end = *cur;
  92
  93   if (line == INT_MAX && loc->start.line != INT_MAX)
  94     warn_at (*loc, _("line number overflow"));
  95   if (column == INT_MAX && loc->start.column != INT_MAX)
  96     warn_at (*loc, _("column number overflow"));
  97 }
  98
  99
 100 /* Output to OUT the location LOC.
 101    Warning: it uses quotearg's slot 3.  */
 102 unsigned
 103 location_print (FILE *out, location loc)
 104 {
 105   unsigned res = 0;
 106   int end_col = 0 != loc.end.column ? loc.end.column - 1 : 0;
 107   res += fprintf (out, "%s",
 108                   quotearg_n_style (3, escape_quoting_style, loc.start.file));
 109   if (0 <= loc.start.line)
 110     {
 111       res += fprintf(out, ":%d", loc.start.line);
 112       if (0 <= loc.start.column)
 113         res += fprintf (out, ".%d", loc.start.column);
 114     }
 115   if (loc.start.file != loc.end.file)
 116     {
 117       res += fprintf (out, "-%s",
 118                       quotearg_n_style (3, escape_quoting_style,
 119                                         loc.end.file));
 120       if (0 <= loc.end.line)
 121         {
 122           res += fprintf(out, ":%d", loc.end.line);
 123           if (0 <= end_col)
 124             res += fprintf (out, ".%d", end_col);
 125         }
 126     }
 127   else if (0 <= loc.end.line)
 128     {
 129       if (loc.start.line < loc.end.line)
 130         {
 131           res += fprintf (out, "-%d", loc.end.line);
 132           if (0 <= end_col)
 133             res += fprintf (out, ".%d", end_col);
 134         }
 135       else if (0 <= end_col && loc.start.column < end_col)
 136         res += fprintf (out, "-%d", end_col);
 137     }
 138
 139   return res;
 140 }
 141
 142 void
 143 boundary_set_from_string (boundary *bound, char *loc_str)
 144 {
 145   /* Must search in reverse since the file name field may
 146    * contain `.' or `:'.  */
 147   char *delim = strrchr (loc_str, '.');
 148   aver (delim);
 149   *delim = '\0';
 150   bound->column = atoi (delim+1);
 151   delim = strrchr (loc_str, ':');
 152   aver (delim);
 153   *delim = '\0';
 154   bound->line = atoi (delim+1);
 155   bound->file = uniqstr_new (loc_str);
 156 }