Files @ r23516:763b689dacfc
Branch filter:

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

Henry Wilson
Codechange: [core] Implement SmallVector using std::vector

The public and protected interface to SmallVector are unchanged
SmallVector now requires that items be default constructible
This isn't an issue since some contained items were previously created
uninitialized.

Temporary default constructors are added to the following structs
- SmallPair
- SmallStackItem
- GRFPresence

Where vector<bool> is required, transition immediately to std::vector
to avoid returning proxy object references.
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/* $Id$ */

/*
 * 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 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/smallvec_type.hpp"

#include <stdarg.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 CDECL error(const char *s, ...)
{
	char buf[1024];
	va_list va;
	va_start(va, s);
	vseprintf(buf, lastof(buf), s, va);
	va_end(va);
	fprintf(stderr, "FATAL: %s\n", buf);
	exit(1);
}

static const int 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.
	 */
	int Add(const char *text, int length)
	{
		int store_size = min(length, OUTPUT_BLOCK_SIZE - this->size);
		assert(store_size >= 0);
		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) != (size_t)this->size) {
			fprintf(stderr, "Error: Cannot write output\n");
		}
	}

	/**
	 * 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;
	}

	int 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, int length = 0)
	{
		if (length == 0) length = strlen(text);

		if (length > 0 && this->BufferHasRoom()) {
			int stored_size = this->output_buffer[this->output_buffer.Length() - 1].Add(text, length);
			length -= stored_size;
			text += stored_size;
		}
		while (length > 0) {
			OutputBuffer *block = this->output_buffer.Append();
			block->Clear(); // Initialize the new block.
			int 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 = this->output_buffer.Begin(); out_data != this->output_buffer.End(); out_data++) {
			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
	{
		uint num_blocks = this->output_buffer.Length();
		return num_blocks > 0 && this->output_buffer[num_blocks - 1].HasRoom();
	}

	typedef SmallVector<OutputBuffer, 2> 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 \c NULL terminated list with group names that should be loaded as lists instead of variables. @see IGT_LIST
	 * @param seq_group_names  A \c NULL terminated list with group names that should be loaded as lists of names. @see IGT_SEQUENCE
	 */
	SettingsIniFile(const char * const *list_group_names = NULL, const char * const *seq_group_names = NULL) :
			IniLoadFile(list_group_names, seq_group_names)
	{
	}

	virtual FILE *OpenFile(const char *filename, Subdirectory subdir, size_t *size)
	{
		/* 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, "rb");
		if (in == NULL) return NULL;

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

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

	virtual void ReportFileError(const char * const pre, const char * const buffer, const char * const post)
	{
		error("%s%s%s", pre, buffer, post);
	}
};

OutputStore _stored_output; ///< Temporary storage of the output, until all processing is done.

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 *DEFAULTS_GROUP_NAME  = "defaults";   ///< Name of the group containing default values for the template variables.

/**
 * Load the INI file.
 * @param filename Name of the file to load.
 * @return         Loaded INI data.
 */
static IniLoadFile *LoadIniFile(const char *filename)
{
	static const char * const seq_groups[] = {PREAMBLE_GROUP_NAME, POSTAMBLE_GROUP_NAME, NULL};

	IniLoadFile *ini = new SettingsIniFile(NULL, seq_groups);
	ini->LoadFromDisk(filename, NO_DIRECTORY);
	return ini;
}

/**
 * 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(IniLoadFile *ifile, const char * const group_name)
{
	IniGroup *grp = ifile->GetGroup(group_name, 0, false);
	if (grp != NULL && grp->type == IGT_SEQUENCE) {
		for (IniItem *item = grp->item; item != NULL; item = item->next) {
			if (item->name) {
				_stored_output.Add(item->name);
				_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 NULL skips the search.
 * @return Text of the item if found, else \c NULL.
 */
static const char *FindItemValue(const char *name, IniGroup *grp, IniGroup *defaults)
{
	IniItem *item = grp->GetItem(name, false);
	if (item == NULL && defaults != NULL) item = defaults->GetItem(name, false);
	if (item == NULL || item->value == NULL) return NULL;
	return item->value;
}

/**
 * Output all non-special sections through the template / template variable expansion system.
 * @param ifile Loaded INI data.
 */
static void DumpSections(IniLoadFile *ifile)
{
	static const int MAX_VAR_LENGTH = 64;
	static const char * const special_group_names[] = {PREAMBLE_GROUP_NAME, POSTAMBLE_GROUP_NAME, DEFAULTS_GROUP_NAME, TEMPLATES_GROUP_NAME, NULL};

	IniGroup *default_grp = ifile->GetGroup(DEFAULTS_GROUP_NAME, 0, false);
	IniGroup *templates_grp  = ifile->GetGroup(TEMPLATES_GROUP_NAME, 0, false);
	if (templates_grp == NULL) return;

	/* Output every group, using its name as template name. */
	for (IniGroup *grp = ifile->group; grp != NULL; grp = grp->next) {
		const char * const *sgn;
		for (sgn = special_group_names; *sgn != NULL; sgn++) if (strcmp(grp->name, *sgn) == 0) break;
		if (*sgn != NULL) continue;

		IniItem *template_item = templates_grp->GetItem(grp->name, false); // Find template value.
		if (template_item == NULL || template_item->value == NULL) {
			fprintf(stderr, "settingsgen: Warning: Cannot find template %s\n", grp->name);
			continue;
		}

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

		/* Output text of the template, except template variables of the form '$[_a-z0-9]+' which get replaced by their value. */
		const char *txt = template_item->value;
		while (*txt != '\0') {
			if (*txt != '$') {
				_stored_output.Add(txt, 1);
				txt++;
				continue;
			}
			txt++;
			if (*txt == '$') { // Literal $
				_stored_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 != NULL) _stored_output.Add(valitem);
			} else {
				_stored_output.Add("$", 1);
			}
		}
		_stored_output.Add("\n", 1); // \n after the expanded template.
		while (count > 0) {
			_stored_output.Add("#endif\n");
			count--;
		}
	}
}

/**
 * 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 == NULL) return;

	FILE *in_fp = fopen(fname, "r");
	if (in_fp == NULL) {
		fprintf(stderr, "settingsgen: Warning: Cannot open file %s for copying\n", fname);
		return;
	}

	char buffer[4096];
	size_t length;
	do {
		length = fread(buffer, 1, lengthof(buffer), in_fp);
		if (fwrite(buffer, 1, length, out_fp) != length) {
			fprintf(stderr, "Error: Cannot copy file\n");
			break;
		}
	} 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 == NULL) return false;

	FILE *f1 = fopen(n1, "rb");
	if (f1 == NULL) {
		fclose(f2);
		error("can't open %s", 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(     'v', "--version"),
	  GETOPT_NOVAL(     'h', "--help"),
	GETOPT_GENERAL('h', '?', NULL, 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)
{
	IniLoadFile *ini_data = LoadIniFile(fname);
	DumpGroup(ini_data, PREAMBLE_GROUP_NAME);
	DumpSections(ini_data);
	DumpGroup(ini_data, POSTAMBLE_GROUP_NAME);
	delete ini_data;
}

/**
 * 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 = NULL;
	const char *before_file = NULL;
	const char *after_file = NULL;

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

		switch (i) {
			case 'v':
				puts("$Revision$");
				return 0;

			case 'h':
				puts("settingsgen - $Revision$\n"
						"Usage: settingsgen [options] ini-file...\n"
						"with options:\n"
						"   -v, --version           Print version information and exit\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:
				fprintf(stderr, "Invalid arguments\n");
				return 1;
		}
	}

	_stored_output.Clear();

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

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

		FILE *fp = fopen(tmp_output, "w");
		if (fp == NULL) {
			fprintf(stderr, "settingsgen: Warning: Cannot open file %s\n", tmp_output);
			return 1;
		}
		CopyFile(before_file, fp);
		_stored_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) error("rename() failed");
		}
	}
	return 0;
}