]> git.saurik.com Git - bison.git/blob - src/location.c
2007-10-17 Wojciech Polak <polak@gnu.org>
[bison.git] / src / location.c
1 /* Locations for Bison
2 Copyright (C) 2002, 2005, 2006, 2007 Free Software Foundation, Inc.
3
4 This file is part of Bison, the GNU Compiler Compiler.
5
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 #include <config.h>
20 #include "system.h"
21
22 #include <mbswidth.h>
23 #include <quotearg.h>
24
25 #include "complain.h"
26 #include "location.h"
27
28 location const empty_location = EMPTY_LOCATION_INIT;
29
30 /* If BUF is null, add BUFSIZE (which in this case must be less than
31 INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to
32 COLUMN. If an overflow occurs, or might occur but is undetectable,
33 return INT_MAX. Assume COLUMN is nonnegative. */
34
35 static inline int
36 add_column_width (int column, char const *buf, size_t bufsize)
37 {
38 size_t width;
39 unsigned int remaining_columns = INT_MAX - column;
40
41 if (buf)
42 {
43 if (INT_MAX / 2 <= bufsize)
44 return INT_MAX;
45 width = mbsnwidth (buf, bufsize, 0);
46 }
47 else
48 width = bufsize;
49
50 return width <= remaining_columns ? column + width : INT_MAX;
51 }
52
53 /* Set *LOC and adjust scanner cursor to account for token TOKEN of
54 size SIZE. */
55
56 void
57 location_compute (location *loc, boundary *cur, char const *token, size_t size)
58 {
59 int line = cur->line;
60 int column = cur->column;
61 char const *p0 = token;
62 char const *p = token;
63 char const *lim = token + size;
64
65 loc->start = *cur;
66
67 for (p = token; p < lim; p++)
68 switch (*p)
69 {
70 case '\n':
71 line += line < INT_MAX;
72 column = 1;
73 p0 = p + 1;
74 break;
75
76 case '\t':
77 column = add_column_width (column, p0, p - p0);
78 column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
79 p0 = p + 1;
80 break;
81
82 default:
83 break;
84 }
85
86 cur->line = line;
87 cur->column = column = add_column_width (column, p0, p - p0);
88
89 loc->end = *cur;
90
91 if (line == INT_MAX && loc->start.line != INT_MAX)
92 warn_at (*loc, _("line number overflow"));
93 if (column == INT_MAX && loc->start.column != INT_MAX)
94 warn_at (*loc, _("column number overflow"));
95 }
96
97
98 /* Output to OUT the location LOC.
99 Warning: it uses quotearg's slot 3. */
100 void
101 location_print (FILE *out, location loc)
102 {
103 int end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
104 fprintf (out, "%s:%d.%d",
105 quotearg_n_style (3, escape_quoting_style, loc.start.file),
106 loc.start.line, loc.start.column);
107
108 if (loc.start.file != loc.end.file)
109 fprintf (out, "-%s:%d.%d",
110 quotearg_n_style (3, escape_quoting_style, loc.end.file),
111 loc.end.line, end_col);
112 else if (loc.start.line < loc.end.line)
113 fprintf (out, "-%d.%d", loc.end.line, end_col);
114 else if (loc.start.column < end_col)
115 fprintf (out, "-%d", end_col);
116 }
117
118 void
119 boundary_set_from_string (boundary *bound, char *loc_str)
120 {
121 /* Must search in reverse since the file name field may
122 * contain `.' or `:'. */
123 char *delim = strrchr (loc_str, '.');
124 aver (delim);
125 *delim = '\0';
126 bound->column = atoi (delim+1);
127 delim = strrchr (loc_str, ':');
128 aver (delim);
129 *delim = '\0';
130 bound->line = atoi (delim+1);
131 bound->file = uniqstr_new (loc_str);
132 }