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/* Locations for Bison
Copyright (C) 2002, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
Bison is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bison is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bison; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include <config.h>
#include "system.h"
#include <mbswidth.h>
#include <quotearg.h>
#include "complain.h"
#include "location.h"
location const empty_location;
/* If BUF is null, add BUFSIZE (which in this case must be less than
INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to
COLUMN. If an overflow occurs, or might occur but is undetectable,
return INT_MAX. Assume COLUMN is nonnegative. */
static inline int
add_column_width (int column, char const *buf, size_t bufsize)
{
size_t width;
unsigned int remaining_columns = INT_MAX - column;
if (buf)
{
if (INT_MAX / 2 <= bufsize)
return INT_MAX;
width = mbsnwidth (buf, bufsize, 0);
}
else
width = bufsize;
return width <= remaining_columns ? column + width : INT_MAX;
}
/* Set *LOC and adjust scanner cursor to account for token TOKEN of
size SIZE. */
void
location_compute (location *loc, boundary *cur, char const *token, size_t size)
{
int line = cur->line;
int column = cur->column;
char const *p0 = token;
char const *p = token;
char const *lim = token + size;
loc->start = *cur;
for (p = token; p < lim; p++)
switch (*p)
{
case '\n':
line += line < INT_MAX;
column = 1;
p0 = p + 1;
break;
case '\t':
column = add_column_width (column, p0, p - p0);
column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
p0 = p + 1;
break;
default:
break;
}
cur->line = line;
cur->column = column = add_column_width (column, p0, p - p0);
loc->end = *cur;
if (line == INT_MAX && loc->start.line != INT_MAX)
warn_at (*loc, _("line number overflow"));
if (column == INT_MAX && loc->start.column != INT_MAX)
warn_at (*loc, _("column number overflow"));
}
/* Output to OUT the location LOC.
Warning: it uses quotearg's slot 3. */
void
location_print (FILE *out, location loc)
{
int end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
fprintf (out, "%s:%d.%d",
quotearg_n_style (3, escape_quoting_style, loc.start.file),
loc.start.line, loc.start.column);
if (loc.start.file != loc.end.file)
fprintf (out, "-%s:%d.%d",
quotearg_n_style (3, escape_quoting_style, loc.end.file),
loc.end.line, end_col);
else if (loc.start.line < loc.end.line)
fprintf (out, "-%d.%d", loc.end.line, end_col);
else if (loc.start.column < end_col)
fprintf (out, "-%d", end_col);
}
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