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/*
Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
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 "util.h"
#include <string>
#include <sstream>
#include <cstdio>
using std::string;
using std::stringstream;
using std::getline;
using boost::optional;
/** @param s A string.
* @return true if the string contains only space, newline or tab characters, or is empty.
*/
bool
sub::empty_or_white_space (string s)
{
for (size_t i = 0; i < s.length(); ++i) {
if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
return false;
}
}
return true;
}
optional<string>
sub::get_line_stringstream (stringstream* str)
{
string s;
getline (*str, s);
if (!str->good ()) {
return optional<string> ();
}
return s;
}
optional<string>
sub::get_line_file (FILE* f)
{
char buffer[256];
char* r = fgets (buffer, sizeof (buffer), f);
if (r == 0 || feof (f)) {
return optional<string> ();
}
return string (buffer);
}
void
sub::remove_unicode_bom (optional<string>& line)
{
if (
line->length() >= 3 &&
static_cast<unsigned char> (line.get()[0]) == 0xef &&
static_cast<unsigned char> (line.get()[1]) == 0xbb &&
static_cast<unsigned char> (line.get()[2]) == 0xbf
) {
/* Skip Unicode byte order mark */
line = line->substr (3);
}
}
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