1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/* Locations for Bison
Copyright (C) 2002, 2005-2015 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 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)
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;
}
/* Persistant 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);
}
|
