summaryrefslogtreecommitdiff
path: root/src/ini.cpp
blob: d79189bd2e853a6f8a783d02bc9d0414e744c897 (plain)
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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file ini.cpp Definition of the IniItem class, related to reading/writing '*.ini' files. */

#include "stdafx.h"
#include "core/alloc_func.hpp"
#include "core/mem_func.hpp"
#include "debug.h"
#include "ini_type.h"
#include "string_func.h"
#include "fileio_func.h"

#if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 199309L) || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 500)
# define WITH_FDATASYNC
# include <unistd.h>
#endif

#ifdef WIN32
# include <shellapi.h>
#endif

IniItem::IniItem(IniGroup *parent, const char *name, size_t len) : next(NULL), value(NULL), comment(NULL)
{
	if (len == 0) len = strlen(name);

	this->name = strndup(name, len);
	*parent->last_item = this;
	parent->last_item = &this->next;
}

IniItem::~IniItem()
{
	free(this->name);
	free(this->value);
	free(this->comment);

	delete this->next;
}

void IniItem::SetValue(const char *value)
{
	free(this->value);
	this->value = strdup(value);
}

IniGroup::IniGroup(IniFile *parent, const char *name, size_t len) : next(NULL), type(IGT_VARIABLES), item(NULL), comment(NULL)
{
	if (len == 0) len = strlen(name);

	this->name = strndup(name, len);
	this->last_item = &this->item;
	*parent->last_group = this;
	parent->last_group = &this->next;

	if (parent->list_group_names == NULL) return;

	for (uint i = 0; parent->list_group_names[i] != NULL; i++) {
		if (strcmp(this->name, parent->list_group_names[i]) == 0) {
			this->type = IGT_LIST;
			return;
		}
	}
}

IniGroup::~IniGroup()
{
	free(this->name);
	free(this->comment);

	delete this->item;
	delete this->next;
}

IniItem *IniGroup::GetItem(const char *name, bool create)
{
	for (IniItem *item = this->item; item != NULL; item = item->next) {
		if (strcmp(item->name, name) == 0) return item;
	}

	if (!create) return NULL;

	/* otherwise make a new one */
	return new IniItem(this, name, strlen(name));
}

void IniGroup::Clear()
{
	delete this->item;
	this->item = NULL;
	this->last_item = &this->item;
}

IniFile::IniFile(const char * const *list_group_names) : group(NULL), comment(NULL), list_group_names(list_group_names)
{
	this->last_group = &this->group;
}

IniFile::~IniFile()
{
	free(this->comment);
	delete this->group;
}

IniGroup *IniFile::GetGroup(const char *name, size_t len)
{
	if (len == 0) len = strlen(name);

	/* does it exist already? */
	for (IniGroup *group = this->group; group != NULL; group = group->next) {
		if (!strncmp(group->name, name, len) && group->name[len] == 0) {
			return group;
		}
	}

	/* otherwise make a new one */
	IniGroup *group = new IniGroup(this, name, len);
	group->comment = strdup("\n");
	return group;
}

void IniFile::RemoveGroup(const char *name)
{
	size_t len = strlen(name);
	IniGroup *prev = NULL;
	IniGroup *group;

	/* does it exist already? */
	for (group = this->group; group != NULL; prev = group, group = group->next) {
		if (strncmp(group->name, name, len) == 0) {
			break;
		}
	}

	if (group == NULL) return;

	if (prev != NULL) {
		prev->next = prev->next->next;
		if (this->last_group == &group->next) this->last_group = &prev->next;
	} else {
		this->group = this->group->next;
		if (this->last_group == &group->next) this->last_group = &this->group;
	}

	group->next = NULL;
	delete group;
}

void IniFile::LoadFromDisk(const char *filename)
{
	assert(this->last_group == &this->group);

	char buffer[1024];
	IniGroup *group = NULL;

	char *comment = NULL;
	uint comment_size = 0;
	uint comment_alloc = 0;

	size_t end;
	/*
	 * Now we are going to open a file that contains no more than simple
	 * plain text. That would raise the question: "why open the file as
	 * if it is a binary file?". That's simple... Microsoft, in all
	 * their greatness and wisdom decided it would be useful if ftell
	 * is aware of '\r\n' and "sees" that as a single character. The
	 * easiest way to test for that situation is by searching for '\n'
	 * and decrease the value every time you encounter a '\n'. This will
	 * thus also make ftell "see" the '\r' when it is not there, so the
	 * result of ftell will be highly unreliable. So to work around this
	 * marvel of wisdom we have to open in as a binary file.
	 */
	FILE *in = FioFOpenFile(filename, "rb", DATA_DIR, &end);
	if (in == NULL) return;

	end += ftell(in);

	/* for each line in the file */
	while ((size_t)ftell(in) < end && fgets(buffer, sizeof(buffer), in)) {
		char c, *s;
		/* trim whitespace from the left side */
		for (s = buffer; *s == ' ' || *s == '\t'; s++) {}

		/* trim whitespace from right side. */
		char *e = s + strlen(s);
		while (e > s && ((c = e[-1]) == '\n' || c == '\r' || c == ' ' || c == '\t')) e--;
		*e = '\0';

		/* skip comments and empty lines */
		if (*s == '#' || *s == ';' || *s == '\0') {
			uint ns = comment_size + (e - s + 1);
			uint a = comment_alloc;
			/* add to comment */
			if (ns > a) {
				a = max(a, 128U);
				do a *= 2; while (a < ns);
				comment = ReallocT(comment, comment_alloc = a);
			}
			uint pos = comment_size;
			comment_size += (e - s + 1);
			comment[pos + e - s] = '\n'; // comment newline
			memcpy(comment + pos, s, e - s); // copy comment contents
			continue;
		}

		/* it's a group? */
		if (s[0] == '[') {
			if (e[-1] != ']') {
				ShowInfoF("ini: invalid group name '%s'", buffer);
			} else {
				e--;
			}
			s++; // skip [
			group = new IniGroup(this, s, e - s);
			if (comment_size) {
				group->comment = strndup(comment, comment_size);
				comment_size = 0;
			}
		} else if (group) {
			char *t;
			/* find end of keyname */
			if (*s == '\"') {
				s++;
				for (t = s; *t != '\0' && *t != '\"'; t++) {}
				if (*t == '\"') *t = ' ';
			} else {
				for (t = s; *t != '\0' && *t != '=' && *t != '\t' && *t != ' '; t++) {}
			}

			/* it's an item in an existing group */
			IniItem *item = new IniItem(group, s, t - s);
			if (comment_size) {
				item->comment = strndup(comment, comment_size);
				comment_size = 0;
			}

			/* find start of parameter */
			while (*t == '=' || *t == ' ' || *t == '\t') t++;

			bool quoted = (*t == '\"');
			/* remove starting quotation marks */
			if (*t == '\"') t++;
			/* remove ending quotation marks */
			e = t + strlen(t);
			if (e > t && e[-1] == '\"') e--;
			*e = '\0';

			/* If the value was not quoted and empty, it must be NULL */
			item->value = (!quoted && e == t) ? NULL : strndup(t, e - t);
		} else {
			/* it's an orphan item */
			ShowInfoF("ini: '%s' outside of group", buffer);
		}
	}

	if (comment_size > 0) {
		this->comment = strndup(comment, comment_size);
		comment_size = 0;
	}

	free(comment);
	fclose(in);
}

bool IniFile::SaveToDisk(const char *filename)
{
	/*
	 * First write the configuration to a (temporary) file and then rename
	 * that file. This to prevent that when OpenTTD crashes during the save
	 * you end up with a truncated configuration file.
	 */
	char file_new[MAX_PATH];

	strecpy(file_new, filename, lastof(file_new));
	strecat(file_new, ".new", lastof(file_new));
	FILE *f = fopen(file_new, "w");
	if (f == NULL) return false;

	for (const IniGroup *group = this->group; group != NULL; group = group->next) {
		if (group->comment) fputs(group->comment, f);
		fprintf(f, "[%s]\n", group->name);
		for (const IniItem *item = group->item; item != NULL; item = item->next) {
			if (item->comment != NULL) fputs(item->comment, f);

			/* protect item->name with quotes if needed */
			if (strchr(item->name, ' ') != NULL ||
					item->name[0] == '[') {
				fprintf(f, "\"%s\"", item->name);
			} else {
				fprintf(f, "%s", item->name);
			}

			fprintf(f, " = %s\n", item->value == NULL ? "" : item->value);
		}
	}
	if (this->comment) fputs(this->comment, f);

/*
 * POSIX (and friends) do not guarantee that when a file is closed it is
 * flushed to the disk. So we manually flush it do disk if we have the
 * APIs to do so. We only need to flush the data as the metadata itself
 * (modification date etc.) is not important to us; only the real data is.
 */
#ifdef WITH_FDATASYNC
	int ret = fdatasync(fileno(f));
	fclose(f);
	if (ret != 0) return false;
#else
	fclose(f);
#endif

#if defined(WIN32) || defined(WIN64)
	/* Allocate space for one more \0 character. */
	TCHAR tfilename[MAX_PATH + 1], tfile_new[MAX_PATH + 1];
	_tcsncpy(tfilename, OTTD2FS(filename), MAX_PATH);
	_tcsncpy(tfile_new, OTTD2FS(file_new), MAX_PATH);
	/* SHFileOperation wants a double '\0' terminated string. */
	tfilename[MAX_PATH - 1] = '\0';
	tfile_new[MAX_PATH - 1] = '\0';
	tfilename[_tcslen(tfilename) + 1] = '\0';
	tfile_new[_tcslen(tfile_new) + 1] = '\0';

	/* Rename file without any user confirmation. */
	SHFILEOPSTRUCT shfopt;
	MemSetT(&shfopt, 0);
	shfopt.wFunc  = FO_MOVE;
	shfopt.fFlags = FOF_NOCONFIRMATION | FOF_NOCONFIRMMKDIR | FOF_NOERRORUI | FOF_SILENT;
	shfopt.pFrom  = tfile_new;
	shfopt.pTo    = tfilename;
	SHFileOperation(&shfopt);
#else
	rename(file_new, filename);
#endif

	return true;
}