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/* Locations for Bison
Copyright (C) 2002, 2005-2015, 2018 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
#include <mbswidth.h>
#include <quotearg.h>
#include "complain.h"
#include "location.h"
location const empty_location = EMPTY_LOCATION_INIT;
/* 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 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)
complain (loc, Wother, _("line number overflow"));
if (column == INT_MAX && loc->start.column != INT_MAX)
complain (loc, Wother, _("column number overflow"));
}
unsigned
location_print (location loc, FILE *out)
{
unsigned res = 0;
int end_col = 0 != loc.end.column ? loc.end.column - 1 : 0;
res += fprintf (out, "%s",
quotearg_n_style (3, escape_quoting_style, loc.start.file));
if (0 <= loc.start.line)
{
res += fprintf (out, ":%d", loc.start.line);
if (0 <= loc.start.column)
res += fprintf (out, ".%d", loc.start.column);
}
if (loc.start.file != loc.end.file)
{
res += fprintf (out, "-%s",
quotearg_n_style (3, escape_quoting_style,
loc.end.file));
if (0 <= loc.end.line)
{
res += fprintf (out, ":%d", loc.end.line);
if (0 <= end_col)
res += fprintf (out, ".%d", end_col);
}
}
else if (0 <= loc.end.line)
{
if (loc.start.line < loc.end.line)
{
res += fprintf (out, "-%d", loc.end.line);
if (0 <= end_col)
res += fprintf (out, ".%d", end_col);
}
else if (0 <= end_col && loc.start.column < end_col)
res += fprintf (out, "-%d", end_col);
}
return res;
}
/* Persistent data used by location_caret to avoid reopening and rereading the
same file all over for each error. */
struct caret_info
{
FILE *source;
size_t line;
size_t offset;
};
static struct caret_info caret_info = { NULL, 1, 0 };
void
cleanup_caret ()
{
if (caret_info.source)
fclose (caret_info.source);
caret_info.source = NULL;
caret_info.line = 1;
caret_info.offset = 0;
}
void
location_caret (location loc, FILE *out)
{
/* FIXME: find a way to support multifile locations, and only open once each
file. That would make the procedure future-proof. */
if (! (caret_info.source
|| (caret_info.source = fopen (loc.start.file, "r")))
|| loc.start.column == -1 || loc.start.line == -1)
return;
/* If the line we want to quote is seekable (the same line as the previous
location), just seek it. If it was a previous line, we lost track of it,
so return to the start of file. */
if (caret_info.line <= loc.start.line)
fseek (caret_info.source, caret_info.offset, SEEK_SET);
else
{
caret_info.line = 1;
caret_info.offset = 0;
fseek (caret_info.source, caret_info.offset, SEEK_SET);
}
/* Advance to the line's position, keeping track of the offset. */
while (caret_info.line < loc.start.line)
caret_info.line += getc (caret_info.source) == '\n';
caret_info.offset = ftell (caret_info.source);
/* Read the actual line. Don't update the offset, so that we keep a pointer
to the start of the line. */
{
int c = getc (caret_info.source);
if (c != EOF)
{
/* Quote the file, indent by a single column. */
putc (' ', out);
do
putc (c, out);
while ((c = getc (caret_info.source)) != EOF && c != '\n');
putc ('\n', out);
{
/* The caret of a multiline location ends with the first line. */
size_t len = loc.start.line != loc.end.line
? ftell (caret_info.source) - caret_info.offset
: loc.end.column;
int i;
/* Print the carets (at least one), with the same indent as above.*/
fprintf (out, " %*s", loc.start.column - 1, "");
for (i = loc.start.column; i == loc.start.column || i < len; ++i)
putc ('^', out);
}
putc ('\n', out);
}
}
}
void
boundary_set_from_string (boundary *bound, char *loc_str)
{
/* Must search in reverse since the file name field may
* contain '.' or ':'. */
char *delim = strrchr (loc_str, '.');
aver (delim);
*delim = '\0';
bound->column = atoi (delim+1);
delim = strrchr (loc_str, ':');
aver (delim);
*delim = '\0';
bound->line = atoi (delim+1);
bound->file = uniqstr_new (loc_str);
}
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