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/*
Copyright (C) 2011 Paul Davis
This program 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; either version 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <fstream>
#include <sstream>
#include <cstdio> /* for ::rename() */
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "pbd/file_subst.h"
#include "pbd/error.h"
#include "pbd/replace_all.h"
#include "pbd/compose.h"
#include "i18n.h"
using namespace PBD;
using namespace std;
/* this implementation assumes that the contents of the file are small enough to fit reasonably into
memory.
*/
int
PBD::file_subst (const string& path, const map<string,string>& dict)
{
ifstream in (path.c_str());
int replacements = 0;
if (!in) {
return -1;
}
/* Get the size of the file */
in.seekg(0,std::ios::end);
std::streampos length = in.tellg();
in.seekg(0,std::ios::beg);
/* allocate a string to hold the data */
string str;
try {
str.reserve (length);
} catch (exception& e) {
error << string_compose (_("could not reserve space to read substitution data from %1 (err: %2"),
path, e.what()) << endmsg;
in.close ();
return -1;
}
/* read the file contents into the string */
while (true) {
str += in.get();
if (in.eof()) {
break;
}
if (in.fail()) {
error << string_compose (_("could not read data for substitution from %1 (err: %2)"),
path, strerror (errno)) << endmsg;
in.close ();
return -1;
}
}
in.close ();
/* do the replacement */
for (map<string,string>::const_iterator i = dict.begin(); i != dict.end(); ++i) {
replacements += replace_all (str, i->first, i->second);
}
if (replacements) {
char suffix[64];
snprintf (suffix, sizeof (suffix), ".fs_%d", getpid());
string s = path + suffix;
ofstream out (s.c_str());
if (out) {
out << str;
if (!out) {
/* ignore error since we're failing anyway, although
it will leave the file around.
*/
out.close ();
(void) ::unlink (s.c_str());
return -1;
} else {
if (::rename (s.c_str(), path.c_str())) {
error << string_compose (_("Could not rename substituted file %1 to %2 (err: %3)"),
s, path, strerror (errno)) << endmsg;
(void) ::unlink (s.c_str());
out.close ();
return -1;
}
}
out.close ();
} else {
return -1;
}
}
return 0;
}
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