Files @ r28396:ef195b601c72
Branch filter:

Location: cpp/openttd-patchpack/source/src/settingsgen/settingsgen.cpp

Peter Nelson
Fix: Pass townnameparts as parameter when testing townname based companyname. (#11685)

Length of returned string could vary and pass/fail the length check with a different
string than the final selection.
  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
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
/*
 * 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 settingsgen.cpp Tool to create computer-readable settings. */

#include "../stdafx.h"
#include "../string_func.h"
#include "../strings_type.h"
#include "../misc/getoptdata.h"
#include "../ini_type.h"
#include "../core/mem_func.hpp"
#include "../error_func.h"

#if !defined(_WIN32) || defined(__CYGWIN__)
#include <unistd.h>
#include <sys/stat.h>
#endif

#include "../safeguards.h"

/**
 * Report a fatal error.
 * @param s Format string.
 * @note Function does not return.
 */
void NORETURN FatalErrorI(const std::string &msg)
{
	fmt::print(stderr, "settingsgen: FATAL: {}\n", msg);
	exit(1);
}

static const size_t OUTPUT_BLOCK_SIZE = 16000; ///< Block size of the buffer in #OutputBuffer.

/** Output buffer for a block of data. */
class OutputBuffer {
public:
	/** Prepare buffer for use. */
	void Clear()
	{
		this->size = 0;
	}

	/**
	 * Add text to the output buffer.
	 * @param text   Text to store.
	 * @param length Length of the text in bytes.
	 * @return Number of bytes actually stored.
	 */
	size_t Add(const char *text, size_t length)
	{
		size_t store_size = std::min(length, OUTPUT_BLOCK_SIZE - this->size);
		assert(store_size <= OUTPUT_BLOCK_SIZE);
		MemCpyT(this->data + this->size, text, store_size);
		this->size += store_size;
		return store_size;
	}

	/**
	 * Dump buffer to the output stream.
	 * @param out_fp Stream to write the \a data to.
	 */
	void Write(FILE *out_fp) const
	{
		if (fwrite(this->data, 1, this->size, out_fp) != this->size) {
			FatalError("Cannot write output");
		}
	}

	/**
	 * Does the block have room for more data?
	 * @return \c true if room is available, else \c false.
	 */
	bool HasRoom() const
	{
		return this->size < OUTPUT_BLOCK_SIZE;
	}

	size_t size;                  ///< Number of bytes stored in \a data.
	char data[OUTPUT_BLOCK_SIZE]; ///< Stored data.
};

/** Temporarily store output. */
class OutputStore {
public:
	OutputStore()
	{
		this->Clear();
	}

	/** Clear the temporary storage. */
	void Clear()
	{
		this->output_buffer.clear();
	}

	/**
	 * Add text to the output storage.
	 * @param text   Text to store.
	 * @param length Length of the text in bytes, \c 0 means 'length of the string'.
	 */
	void Add(const char *text, size_t length = 0)
	{
		if (length == 0) length = strlen(text);

		if (length > 0 && this->BufferHasRoom()) {
			size_t stored_size = this->output_buffer[this->output_buffer.size() - 1].Add(text, length);
			length -= stored_size;
			text += stored_size;
		}
		while (length > 0) {
			OutputBuffer &block = this->output_buffer.emplace_back();
			block.Clear(); // Initialize the new block.
			size_t stored_size = block.Add(text, length);
			length -= stored_size;
			text += stored_size;
		}
	}

	/**
	 * Write all stored output to the output stream.
	 * @param out_fp Stream to write the \a data to.
	 */
	void Write(FILE *out_fp) const
	{
		for (const OutputBuffer &out_data : output_buffer) {
			out_data.Write(out_fp);
		}
	}

private:
	/**
	 * Does the buffer have room without adding a new #OutputBuffer block?
	 * @return \c true if room is available, else \c false.
	 */
	bool BufferHasRoom() const
	{
		size_t num_blocks = this->output_buffer.size();
		return num_blocks > 0 && this->output_buffer[num_blocks - 1].HasRoom();
	}

	typedef std::vector<OutputBuffer> OutputBufferVector; ///< Vector type for output buffers.
	OutputBufferVector output_buffer; ///< Vector of blocks containing the stored output.
};


/** Derived class for loading INI files without going through Fio stuff. */
struct SettingsIniFile : IniLoadFile {
	/**
	 * Construct a new ini loader.
	 * @param list_group_names A list with group names that should be loaded as lists instead of variables. @see IGT_LIST
	 * @param seq_group_names  A list with group names that should be loaded as lists of names. @see IGT_SEQUENCE
	 */
	SettingsIniFile(const IniGroupNameList &list_group_names = {}, const IniGroupNameList &seq_group_names = {}) :
			IniLoadFile(list_group_names, seq_group_names)
	{
	}

	FILE *OpenFile(const std::string &filename, Subdirectory, size_t *size) override
	{
		/* Open the text file in binary mode to prevent end-of-line translations
		 * done by ftell() and friends, as defined by K&R. */
		FILE *in = fopen(filename.c_str(), "rb");
		if (in == nullptr) return nullptr;

		fseek(in, 0L, SEEK_END);
		*size = ftell(in);

		fseek(in, 0L, SEEK_SET); // Seek back to the start of the file.
		return in;
	}

	void ReportFileError(const char * const pre, const char * const buffer, const char * const post) override
	{
		FatalError("{}{}{}", pre, buffer, post);
	}
};

OutputStore _stored_output; ///< Temporary storage of the output, until all processing is done.
OutputStore _post_amble_output; ///< Similar to _stored_output, but for the post amble.

static const char *PREAMBLE_GROUP_NAME  = "pre-amble"; ///< Name of the group containing the pre amble.
static const char *POSTAMBLE_GROUP_NAME = "post-amble"; ///< Name of the group containing the post amble.
static const char *TEMPLATES_GROUP_NAME = "templates"; ///< Name of the group containing the templates.
static const char *VALIDATION_GROUP_NAME = "validation"; ///< Name of the group containing the validation statements.
static const char *DEFAULTS_GROUP_NAME  = "defaults"; ///< Name of the group containing default values for the template variables.

/**
 * Dump a #IGT_SEQUENCE group into #_stored_output.
 * @param ifile      Loaded INI data.
 * @param group_name Name of the group to copy.
 */
static void DumpGroup(const IniLoadFile &ifile, const char * const group_name)
{
	const IniGroup *grp = ifile.GetGroup(group_name);
	if (grp != nullptr && grp->type == IGT_SEQUENCE) {
		for (const IniItem &item : grp->items) {
			if (!item.name.empty()) {
				_stored_output.Add(item.name.c_str());
				_stored_output.Add("\n", 1);
			}
		}
	}
}

/**
 * Find the value of a template variable.
 * @param name Name of the item to find.
 * @param grp  Group currently being expanded (searched first).
 * @param defaults Fallback group to search, \c nullptr skips the search.
 * @return Text of the item if found, else \c nullptr.
 */
static const char *FindItemValue(const char *name, const IniGroup *grp, const IniGroup *defaults)
{
	const IniItem *item = grp->GetItem(name);
	if (item == nullptr && defaults != nullptr) item = defaults->GetItem(name);
	if (item == nullptr || !item->value.has_value()) return nullptr;
	return item->value->c_str();
}

/**
 * Parse a single entry via a template and output this.
 * @param item The template to use for the output.
 * @param grp Group current being used for template rendering.
 * @param default_grp Default values for items not set in @grp.
 * @param output Output to use for result.
 */
static void DumpLine(const IniItem *item, const IniGroup *grp, const IniGroup *default_grp, OutputStore &output)
{
	static const int MAX_VAR_LENGTH = 64;

	/* Prefix with #if/#ifdef/#ifndef */
	static const auto pp_lines = {"if", "ifdef", "ifndef"};
	int count = 0;
	for (const auto &name : pp_lines) {
		const char *condition = FindItemValue(name, grp, default_grp);
		if (condition != nullptr) {
			output.Add("#", 1);
			output.Add(name);
			output.Add(" ", 1);
			output.Add(condition);
			output.Add("\n", 1);
			count++;
		}
	}

	/* Output text of the template, except template variables of the form '$[_a-z0-9]+' which get replaced by their value. */
	const char *txt = item->value->c_str();
	while (*txt != '\0') {
		if (*txt != '$') {
			output.Add(txt, 1);
			txt++;
			continue;
		}
		txt++;
		if (*txt == '$') { // Literal $
			output.Add(txt, 1);
			txt++;
			continue;
		}

		/* Read variable. */
		char variable[MAX_VAR_LENGTH];
		int i = 0;
		while (i < MAX_VAR_LENGTH - 1) {
			if (!(txt[i] == '_' || (txt[i] >= 'a' && txt[i] <= 'z') || (txt[i] >= '0' && txt[i] <= '9'))) break;
			variable[i] = txt[i];
			i++;
		}
		variable[i] = '\0';
		txt += i;

		if (i > 0) {
			/* Find the text to output. */
			const char *valitem = FindItemValue(variable, grp, default_grp);
			if (valitem != nullptr) output.Add(valitem);
		} else {
			output.Add("$", 1);
		}
	}
	output.Add("\n", 1); // \n after the expanded template.
	while (count > 0) {
		output.Add("#endif\n");
		count--;
	}
}

/**
 * Output all non-special sections through the template / template variable expansion system.
 * @param ifile Loaded INI data.
 */
static void DumpSections(const IniLoadFile &ifile)
{
	static const auto special_group_names = {PREAMBLE_GROUP_NAME, POSTAMBLE_GROUP_NAME, DEFAULTS_GROUP_NAME, TEMPLATES_GROUP_NAME, VALIDATION_GROUP_NAME};

	const IniGroup *default_grp = ifile.GetGroup(DEFAULTS_GROUP_NAME);
	const IniGroup *templates_grp = ifile.GetGroup(TEMPLATES_GROUP_NAME);
	const IniGroup *validation_grp = ifile.GetGroup(VALIDATION_GROUP_NAME);
	if (templates_grp == nullptr) return;

	/* Output every group, using its name as template name. */
	for (const IniGroup &grp : ifile.groups) {
		/* Exclude special group names. */
		if (std::find(std::begin(special_group_names), std::end(special_group_names), grp.name) != std::end(special_group_names)) continue;

		const IniItem *template_item = templates_grp->GetItem(grp.name); // Find template value.
		if (template_item == nullptr || !template_item->value.has_value()) {
			FatalError("Cannot find template {}", grp.name);
		}
		DumpLine(template_item, &grp, default_grp, _stored_output);

		if (validation_grp != nullptr) {
			const IniItem *validation_item = validation_grp->GetItem(grp.name); // Find template value.
			if (validation_item != nullptr && validation_item->value.has_value()) {
				DumpLine(validation_item, &grp, default_grp, _post_amble_output);
			}
		}
	}
}

/**
 * Copy a file to the output.
 * @param fname Filename of file to copy.
 * @param out_fp Output stream to write to.
 */
static void CopyFile(const char *fname, FILE *out_fp)
{
	if (fname == nullptr) return;

	FILE *in_fp = fopen(fname, "r");
	if (in_fp == nullptr) {
		FatalError("Cannot open file {} for copying", fname);
	}

	char buffer[4096];
	size_t length;
	do {
		length = fread(buffer, 1, lengthof(buffer), in_fp);
		if (fwrite(buffer, 1, length, out_fp) != length) {
			FatalError("Cannot copy file");
		}
	} while (length == lengthof(buffer));

	fclose(in_fp);
}

/**
 * Compare two files for identity.
 * @param n1 First file.
 * @param n2 Second file.
 * @return True if both files are identical.
 */
static bool CompareFiles(const char *n1, const char *n2)
{
	FILE *f2 = fopen(n2, "rb");
	if (f2 == nullptr) return false;

	FILE *f1 = fopen(n1, "rb");
	if (f1 == nullptr) {
		fclose(f2);
		FatalError("can't open {}", n1);
	}

	size_t l1, l2;
	do {
		char b1[4096];
		char b2[4096];
		l1 = fread(b1, 1, sizeof(b1), f1);
		l2 = fread(b2, 1, sizeof(b2), f2);

		if (l1 != l2 || memcmp(b1, b2, l1) != 0) {
			fclose(f2);
			fclose(f1);
			return false;
		}
	} while (l1 != 0);

	fclose(f2);
	fclose(f1);
	return true;
}

/** Options of settingsgen. */
static const OptionData _opts[] = {
	  GETOPT_NOVAL(     'h', "--help"),
	GETOPT_GENERAL('h', '?', nullptr, ODF_NO_VALUE),
	  GETOPT_VALUE(     'o', "--output"),
	  GETOPT_VALUE(     'b', "--before"),
	  GETOPT_VALUE(     'a', "--after"),
	GETOPT_END(),
};

/**
 * Process a single INI file.
 * The file should have a [templates] group, where each item is one template.
 * Variables in a template have the form '\$[_a-z0-9]+' (a literal '$' followed
 * by one or more '_', lowercase letters, or lowercase numbers).
 *
 * After loading, the [pre-amble] group is copied verbatim if it exists.
 *
 * For every group with a name that matches a template name the template is written.
 * It starts with a optional \c \#if line if an 'if' item exists in the group. The item
 * value is used as condition. Similarly, \c \#ifdef and \c \#ifndef lines are also written.
 * Below the macro processor directives, the value of the template is written
 * at a line with its variables replaced by item values of the group being written.
 * If the group has no item for the variable, the [defaults] group is tried as fall back.
 * Finally, \c \#endif lines are written to match the macro processor lines.
 *
 * Last but not least, the [post-amble] group is copied verbatim.
 *
 * @param fname  Ini file to process. @return Exit status of the processing.
 */
static void ProcessIniFile(const char *fname)
{
	static const IniLoadFile::IniGroupNameList seq_groups = {PREAMBLE_GROUP_NAME, POSTAMBLE_GROUP_NAME};

	SettingsIniFile ini{{}, seq_groups};
	ini.LoadFromDisk(fname, NO_DIRECTORY);

	DumpGroup(ini, PREAMBLE_GROUP_NAME);
	DumpSections(ini);
	DumpGroup(ini, POSTAMBLE_GROUP_NAME);
}

/**
 * And the main program (what else?)
 * @param argc Number of command-line arguments including the program name itself.
 * @param argv Vector of the command-line arguments.
 */
int CDECL main(int argc, char *argv[])
{
	const char *output_file = nullptr;
	const char *before_file = nullptr;
	const char *after_file = nullptr;

	GetOptData mgo(argc - 1, argv + 1, _opts);
	for (;;) {
		int i = mgo.GetOpt();
		if (i == -1) break;

		switch (i) {
			case 'h':
				fmt::print("settingsgen\n"
						"Usage: settingsgen [options] ini-file...\n"
						"with options:\n"
						"   -h, -?, --help          Print this help message and exit\n"
						"   -b FILE, --before FILE  Copy FILE before all settings\n"
						"   -a FILE, --after FILE   Copy FILE after all settings\n"
						"   -o FILE, --output FILE  Write output to FILE\n");
				return 0;

			case 'o':
				output_file = mgo.opt;
				break;

			case 'a':
				after_file = mgo.opt;
				break;

			case 'b':
				before_file = mgo.opt;
				break;

			case -2:
				fmt::print(stderr, "Invalid arguments\n");
				return 1;
		}
	}

	_stored_output.Clear();
	_post_amble_output.Clear();

	for (int i = 0; i < mgo.numleft; i++) ProcessIniFile(mgo.argv[i]);

	/* Write output. */
	if (output_file == nullptr) {
		CopyFile(before_file, stdout);
		_stored_output.Write(stdout);
		_post_amble_output.Write(stdout);
		CopyFile(after_file, stdout);
	} else {
		static const char * const tmp_output = "tmp2.xxx";

		FILE *fp = fopen(tmp_output, "w");
		if (fp == nullptr) {
			FatalError("Cannot open file {}", tmp_output);
		}
		CopyFile(before_file, fp);
		_stored_output.Write(fp);
		_post_amble_output.Write(fp);
		CopyFile(after_file, fp);
		fclose(fp);

		if (CompareFiles(tmp_output, output_file)) {
			/* Files are equal. tmp2.xxx is not needed. */
			unlink(tmp_output);
		} else {
			/* Rename tmp2.xxx to output file. */
#if defined(_WIN32)
			unlink(output_file);
#endif
			if (rename(tmp_output, output_file) == -1) FatalError("rename() failed");
		}
	}
	return 0;
}