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/*
* 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 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 = 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) {
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;
}
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) {
/*C++17: OutputBuffer &block =*/ this->output_buffer.emplace_back();
OutputBuffer &block = this->output_buffer.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 \c nullptr terminated list with group names that should be loaded as lists instead of variables. @see IGT_LIST
* @param seq_group_names A \c nullptr terminated list with group names that should be loaded as lists of names. @see IGT_SEQUENCE
*/
SettingsIniFile(const char * const *list_group_names = nullptr, const char * const *seq_group_names = nullptr) :
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 == 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;
}
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, nullptr};
IniLoadFile *ini = new SettingsIniFile(nullptr, 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, false);
if (grp != nullptr && grp->type == IGT_SEQUENCE) {
for (IniItem *item = grp->item; item != nullptr; item = item->next) {
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, IniGroup *grp, IniGroup *defaults)
{
IniItem *item = grp->GetItem(name, false);
if (item == nullptr && defaults != nullptr) item = defaults->GetItem(name, false);
if (item == nullptr || !item->value.has_value()) return nullptr;
return item->value->c_str();
}
/**
* 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, nullptr};
IniGroup *default_grp = ifile->GetGroup(DEFAULTS_GROUP_NAME, false);
IniGroup *templates_grp = ifile->GetGroup(TEMPLATES_GROUP_NAME, false);
if (templates_grp == nullptr) return;
/* Output every group, using its name as template name. */
for (IniGroup *grp = ifile->group; grp != nullptr; grp = grp->next) {
const char * const *sgn;
for (sgn = special_group_names; *sgn != nullptr; sgn++) if (grp->name == *sgn) break;
if (*sgn != nullptr) continue;
IniItem *template_item = templates_grp->GetItem(grp->name, false); // Find template value.
if (template_item == nullptr || !template_item->value.has_value()) {
fprintf(stderr, "settingsgen: Warning: Cannot find template %s\n", grp->name.c_str());
continue;
}
/* Prefix with #if/#ifdef/#ifndef */
static const char * const pp_lines[] = {"if", "ifdef", "ifndef", nullptr};
int count = 0;
for (const char * const *name = pp_lines; *name != nullptr; name++) {
const char *condition = FindItemValue(*name, grp, default_grp);
if (condition != nullptr) {
_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 '$[_a-z0-9]+' which get replaced by their value. */
const char *txt = template_item->value->c_str();
while (*txt != '\0') {
if (*txt != '$') {
_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 != nullptr) _stored_output.Add(valitem);
} else {
_stored_output.Add("$", 1);
}
}
_stored_output.Add("\n", 1); // \n after the expanded template.
while (count > 0) {
_stored_output.Add("#endif\n");
count--;
}
}
}
/**
* Copy a file to the output.
* @param fname Filename of file to copy.
* @param out_fp Output stream to write to.
*/
static void CopyFile(const char *fname, FILE *out_fp)
{
if (fname == nullptr) return;
FILE *in_fp = fopen(fname, "r");
if (in_fp == nullptr) {
fprintf(stderr, "settingsgen: Warning: Cannot open file %s for copying\n", fname);
return;
}
char buffer[4096];
size_t length;
do {
length = fread(buffer, 1, lengthof(buffer), in_fp);
if (fwrite(buffer, 1, length, out_fp) != length) {
fprintf(stderr, "Error: Cannot copy file\n");
break;
}
} while (length == lengthof(buffer));
fclose(in_fp);
}
/**
* Compare two files for identity.
* @param n1 First file.
* @param n2 Second file.
* @return True if both files are identical.
*/
static bool CompareFiles(const char *n1, const char *n2)
{
FILE *f2 = fopen(n2, "rb");
if (f2 == nullptr) return false;
FILE *f1 = fopen(n1, "rb");
if (f1 == nullptr) {
fclose(f2);
error("can't open %s", n1);
}
size_t l1, l2;
do {
char b1[4096];
char b2[4096];
l1 = fread(b1, 1, sizeof(b1), f1);
l2 = fread(b2, 1, sizeof(b2), f2);
if (l1 != l2 || memcmp(b1, b2, l1) != 0) {
fclose(f2);
fclose(f1);
return false;
}
} while (l1 != 0);
fclose(f2);
fclose(f1);
return true;
}
/** Options of settingsgen. */
static const OptionData _opts[] = {
GETOPT_NOVAL( 'v', "--version"),
GETOPT_NOVAL( 'h', "--help"),
GETOPT_GENERAL('h', '?', nullptr, ODF_NO_VALUE),
GETOPT_VALUE( 'o', "--output"),
GETOPT_VALUE( 'b', "--before"),
GETOPT_VALUE( 'a', "--after"),
GETOPT_END(),
};
/**
* Process a single INI file.
* The file should have a [templates] group, where each item is one template.
* Variables in a template have the form '\$[_a-z0-9]+' (a literal '$' 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)
{
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 = 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 '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 == nullptr) {
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 == nullptr) {
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;
}
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