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1/* Open and close files for Bison.
2
3 Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
4 2005, 2006, 2007, 2008 Free 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 <error.h>
25#include <dirname.h>
26#include <get-errno.h>
27#include <quote.h>
28#include <stdio-safer.h>
29#include <xstrndup.h>
30
31#include "complain.h"
32#include "files.h"
33#include "getargs.h"
34#include "gram.h"
35
36/* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
37 tempting, but don't do that: for the time being our handling of the
38 %directive vs --option leaves precedence to the options by deciding
39 that if a %directive sets a variable which is really set (i.e., not
40 NULL), then the %directive is ignored. As a result, %name-prefix,
41 for instance, will not be honored. */
42
43char const *spec_outfile = NULL; /* for -o. */
44char const *spec_file_prefix = NULL; /* for -b. */
45char const *spec_name_prefix = NULL; /* for -p. */
46char *spec_verbose_file = NULL; /* for --verbose. */
47char *spec_graph_file = NULL; /* for -g. */
48char *spec_xml_file = NULL; /* for -x. */
49char *spec_defines_file = NULL; /* for --defines. */
50char *parser_file_name;
51
52/* All computed output file names. */
53static char **file_names = NULL;
54static int file_names_count = 0;
55
56uniqstr grammar_file = NULL;
57uniqstr current_file = NULL;
58
59/* If --output=dir/foo.c was specified,
60 DIR_PREFIX is `dir/' and ALL_BUT_EXT and ALL_BUT_TAB_EXT are `dir/foo'.
61
62 If --output=dir/foo.tab.c was specified, DIR_PREFIX is `dir/',
63 ALL_BUT_EXT is `dir/foo.tab', and ALL_BUT_TAB_EXT is `dir/foo'.
64
65 If --output was not specified but --file-prefix=dir/foo was specified,
66 ALL_BUT_EXT = `foo.tab' and ALL_BUT_TAB_EXT = `foo'.
67
68 If neither --output nor --file was specified but the input grammar
69 is name dir/foo.y, ALL_BUT_EXT and ALL_BUT_TAB_EXT are `foo'.
70
71 If neither --output nor --file was specified, DIR_PREFIX is the
72 empty string (meaning the current directory); otherwise it is
73 `dir/'. */
74
75char *all_but_ext;
76static char *all_but_tab_ext;
77char *dir_prefix;
78
79/* C source file extension (the parser source). */
80static char *src_extension = NULL;
81/* Header file extension (if option ``-d'' is specified). */
82static char *header_extension = NULL;
83\f
84/*-----------------------------------------------------------------.
85| Return a newly allocated string composed of the concatenation of |
86| STR1, and STR2. |
87`-----------------------------------------------------------------*/
88
89static char *
90concat2 (char const *str1, char const *str2)
91{
92 size_t len = strlen (str1) + strlen (str2);
93 char *res = xmalloc (len + 1);
94 char *cp;
95 cp = stpcpy (res, str1);
96 cp = stpcpy (cp, str2);
97 return res;
98}
99
100/*-----------------------------------------------------------------.
101| Try to open file NAME with mode MODE, and print an error message |
102| if fails. |
103`-----------------------------------------------------------------*/
104
105FILE *
106xfopen (const char *name, const char *mode)
107{
108 FILE *ptr;
109
110 ptr = fopen_safer (name, mode);
111 if (!ptr)
112 error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
113
114 return ptr;
115}
116
117/*-------------------------------------------------------------.
118| Try to close file PTR, and print an error message if fails. |
119`-------------------------------------------------------------*/
120
121void
122xfclose (FILE *ptr)
123{
124 if (ptr == NULL)
125 return;
126
127 if (ferror (ptr))
128 error (EXIT_FAILURE, 0, _("I/O error"));
129
130 if (fclose (ptr) != 0)
131 error (EXIT_FAILURE, get_errno (), _("cannot close file"));
132}
133\f
134
135/*------------------------------------------------------------------.
136| Compute ALL_BUT_EXT, ALL_BUT_TAB_EXT and output files extensions. |
137`------------------------------------------------------------------*/
138
139/* In the string S, replace all characters FROM by TO. */
140static void
141tr (char *s, char from, char to)
142{
143 for (; *s; s++)
144 if (*s == from)
145 *s = to;
146}
147
148/* Compute extensions from the grammar file extension. */
149static void
150compute_exts_from_gf (const char *ext)
151{
152 if (strcmp (ext, ".y") == 0)
153 {
154 src_extension = xstrdup (language->src_extension);
155 header_extension = xstrdup (language->header_extension);
156 }
157 else
158 {
159 src_extension = xstrdup (ext);
160 header_extension = xstrdup (ext);
161 tr (src_extension, 'y', 'c');
162 tr (src_extension, 'Y', 'C');
163 tr (header_extension, 'y', 'h');
164 tr (header_extension, 'Y', 'H');
165 }
166}
167
168/* Compute extensions from the given c source file extension. */
169static void
170compute_exts_from_src (const char *ext)
171{
172 /* We use this function when the user specifies `-o' or `--output',
173 so the extenions must be computed unconditionally from the file name
174 given by this option. */
175 src_extension = xstrdup (ext);
176 header_extension = xstrdup (ext);
177 tr (header_extension, 'c', 'h');
178 tr (header_extension, 'C', 'H');
179}
180
181
182/* Decompose FILE_NAME in four parts: *BASE, *TAB, and *EXT, the fourth
183 part, (the directory) is ranging from FILE_NAME to the char before
184 *BASE, so we don't need an additional parameter.
185
186 *EXT points to the last period in the basename, or NULL if none.
187
188 If there is no *EXT, *TAB is NULL. Otherwise, *TAB points to
189 `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
190 cannot be equal to *BASE.
191
192 None are allocated, they are simply pointers to parts of FILE_NAME.
193 Examples:
194
195 '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
196 '.c'
197
198 'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
199
200 'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
201
202 '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
203
204 'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
205
206 'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
207
208 'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL. */
209
210static void
211file_name_split (const char *file_name,
212 const char **base, const char **tab, const char **ext)
213{
214 *base = last_component (file_name);
215
216 /* Look for the extension, i.e., look for the last dot. */
217 *ext = strrchr (*base, '.');
218 *tab = NULL;
219
220 /* If there is an extension, check if there is a `.tab' part right
221 before. */
222 if (*ext)
223 {
224 size_t baselen = *ext - *base;
225 size_t dottablen = 4;
226 if (dottablen < baselen
227 && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
228 || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
229 *tab = *ext - dottablen;
230 }
231}
232
233
234static void
235compute_file_name_parts (void)
236{
237 const char *base, *tab, *ext;
238
239 /* Compute ALL_BUT_EXT and ALL_BUT_TAB_EXT from SPEC_OUTFILE
240 or GRAMMAR_FILE.
241
242 The precise -o name will be used for FTABLE. For other output
243 files, remove the ".c" or ".tab.c" suffix. */
244 if (spec_outfile)
245 {
246 file_name_split (spec_outfile, &base, &tab, &ext);
247 dir_prefix = xstrndup (spec_outfile, base - spec_outfile);
248
249 /* ALL_BUT_EXT goes up the EXT, excluding it. */
250 all_but_ext =
251 xstrndup (spec_outfile,
252 (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
253
254 /* ALL_BUT_TAB_EXT goes up to TAB, excluding it. */
255 all_but_tab_ext =
256 xstrndup (spec_outfile,
257 (strlen (spec_outfile)
258 - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
259
260 if (ext)
261 compute_exts_from_src (ext);
262 }
263 else
264 {
265 file_name_split (grammar_file, &base, &tab, &ext);
266
267 if (spec_file_prefix)
268 {
269 /* If --file-prefix=foo was specified, ALL_BUT_TAB_EXT = `foo'. */
270 dir_prefix =
271 xstrndup (spec_file_prefix,
272 last_component (spec_file_prefix) - spec_file_prefix);
273 all_but_tab_ext = xstrdup (spec_file_prefix);
274 }
275 else if (yacc_flag)
276 {
277 /* If --yacc, then the output is `y.tab.c'. */
278 dir_prefix = xstrdup ("");
279 all_but_tab_ext = xstrdup ("y");
280 }
281 else
282 {
283 /* Otherwise, ALL_BUT_TAB_EXT is computed from the input
284 grammar: `foo/bar.yy' => `bar'. */
285 dir_prefix = xstrdup ("");
286 all_but_tab_ext =
287 xstrndup (base, (strlen (base) - (ext ? strlen (ext) : 0)));
288 }
289
290 if (language->add_tab)
291 all_but_ext = concat2 (all_but_tab_ext, TAB_EXT);
292 else
293 all_but_ext = xstrdup (all_but_tab_ext);
294
295 /* Compute the extensions from the grammar file name. */
296 if (ext && !yacc_flag)
297 compute_exts_from_gf (ext);
298 }
299}
300
301
302/* Compute the output file names. Warn if we detect conflicting
303 outputs to the same file. */
304
305void
306compute_output_file_names (void)
307{
308 compute_file_name_parts ();
309
310 /* If not yet done. */
311 if (!src_extension)
312 src_extension = xstrdup (".c");
313 if (!header_extension)
314 header_extension = xstrdup (".h");
315
316 parser_file_name =
317 (spec_outfile
318 ? xstrdup (spec_outfile)
319 : concat2 (all_but_ext, src_extension));
320
321 if (defines_flag)
322 {
323 if (! spec_defines_file)
324 spec_defines_file = concat2 (all_but_ext, header_extension);
325 }
326
327 if (graph_flag)
328 {
329 if (! spec_graph_file)
330 spec_graph_file = concat2 (all_but_tab_ext, ".dot");
331 output_file_name_check (spec_graph_file);
332 }
333
334 if (xml_flag)
335 {
336 if (! spec_xml_file)
337 spec_xml_file = concat2 (all_but_tab_ext, ".xml");
338 output_file_name_check (spec_xml_file);
339 }
340
341 if (report_flag)
342 {
343 if (!spec_verbose_file)
344 spec_verbose_file = concat2 (all_but_tab_ext, OUTPUT_EXT);
345 output_file_name_check (spec_verbose_file);
346 }
347
348 free (all_but_tab_ext);
349 free (src_extension);
350 free (header_extension);
351}
352
353void
354output_file_name_check (char const *file_name)
355{
356 if (0 == strcmp (file_name, grammar_file))
357 fatal (_("refusing to overwrite the input file %s"), quote (file_name));
358 {
359 int i;
360 for (i = 0; i < file_names_count; i++)
361 if (0 == strcmp (file_names[i], file_name))
362 warn (_("conflicting outputs to file %s"), quote (file_name));
363 }
364 file_names = xnrealloc (file_names, ++file_names_count, sizeof *file_names);
365 file_names[file_names_count-1] = xstrdup (file_name);
366}
367
368void
369output_file_names_free (void)
370{
371 free (all_but_ext);
372 free (spec_verbose_file);
373 free (spec_graph_file);
374 free (spec_xml_file);
375 free (spec_defines_file);
376 free (parser_file_name);
377 free (dir_prefix);
378 {
379 int i;
380 for (i = 0; i < file_names_count; i++)
381 free (file_names[i]);
382 }
383 free (file_names);
384}