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/* Copyright (c) 1997-2024
Ewgenij Gawrilow, Michael Joswig, and the polymake team
Technische Universität Berlin, Germany
https://polymake.org
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, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
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.
--------------------------------------------------------------------------------
*/
#pragma once
#include <sys/types.h>
#include <cctype>
#include <cstring>
#include <cstddef>
#include <limits>
#include "polymake/internal/streambuf_ext.h"
namespace pm {
class CharBuffer : public streambuf_ext {
private:
CharBuffer() = delete;
~CharBuffer();
public:
using std::streambuf::traits_type;
using std::streambuf::int_type;
void skip_all()
{
setg(eback(), egptr(), egptr());
}
static void skip_all(std::streambuf* buf_)
{
static_cast<CharBuffer*>(buf_)->skip_all();
}
static int_type seek_forward(std::streambuf* buf_, size_type offset)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
if (buf->gptr() + offset >= buf->egptr() && buf->underflow() == eof_char)
return eof_char;
return buf->gptr()[offset];
}
static size_type next_ws(std::streambuf* buf_, size_type offset = 0, bool report_eof = true)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
for (int_type c; (c = seek_forward(buf, offset)) != eof_char; ++offset)
if (isspace(c)) return offset;
return report_eof ? -1 : offset;
}
static size_type next_non_ws(std::streambuf *buf_, size_type offset = 0)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
for (int_type c; (c = seek_forward(buf, offset)) != eof_char; ++offset)
if (!isspace(c)) return offset;
return -1;
}
static bool skip_ws(std::streambuf* buf_)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const size_type i = next_non_ws(buf);
if (i < 0) {
buf->skip_all();
return false;
} else {
buf->gbump(i);
return true;
}
}
static size_type find_char_forward(std::streambuf* buf_, const char c, size_type offset = 0)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
if (seek_forward(buf, offset) != eof_char) {
do {
if (char* found = (char*)memchr(buf->gptr()+offset, c, buf->egptr() - (buf->gptr() + offset)))
return found - buf->gptr();
offset = buf->egptr() - buf->gptr();
} while (buf->underflow() != eof_char);
}
return -1;
}
static int_type ignore(std::streambuf* buf_, const char c)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
int_type next_c;
while ((next_c = seek_forward(buf, 0)) != eof_char) {
if (next_c == c) {
buf->gbump(1);
break;
}
if (char* found = (char*)memchr(buf->gptr(), c, buf->egptr() - buf->gptr())) {
buf->gbump(found - buf->gptr()+1);
return c;
}
buf->skip_all();
}
return next_c;
}
static size_type find_string_forward(std::streambuf* buf_, const char* c, size_type len, size_type offset)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
const int_type eof_char = traits_type::eof();
while ((offset = find_char_forward(buf, c[0], offset)) >= 0 &&
seek_forward(buf, offset+len-1) != eof_char) {
if (!memcmp(buf->gptr()+offset, c, len)) return offset;
++offset;
}
return -1;
}
static size_type count_char(std::streambuf *buf_, const char c)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
char* start = buf->gptr(), *end = buf->egptr();
size_type cnt = 0;
while ((start = (char*)memchr(start, c, end - start)) != nullptr) {
++cnt; ++start;
}
return cnt;
}
static size_type count_lines(std::streambuf *buf)
{
if (!skip_ws(buf)) return 0;
return count_char(buf, '\n');
}
static size_type matching_brace(std::streambuf* buf, char opening, char closing, size_type offset = 0);
static size_type get_string(std::streambuf* buf, std::string&, char delim);
static char* get_buf_start(std::streambuf* buf_)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
return buf->eback();
}
static char* get_ptr(std::streambuf* buf_)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
return buf->gptr();
}
static char* end_get_ptr(std::streambuf* buf_)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
return buf->egptr();
}
static void get_bump(std::streambuf *buf_, size_type offset)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
buf->gbump(offset);
}
static void set_end_get_ptr(std::streambuf* buf_, char* end)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
buf->setg(buf->eback(), buf->gptr(), end);
}
static void set_end_get_ptr(std::streambuf* buf_, size_type offset)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
buf->setg(buf->eback(), buf->gptr(), buf->gptr() + offset);
}
static void set_get_and_end_ptr(std::streambuf* buf_, char* get, char* end)
{
CharBuffer* buf = static_cast<CharBuffer*>(buf_);
buf->setg(buf->eback(), get, end);
}
static const char* get_input_limit(std::streambuf* buf_)
{
return static_cast<CharBuffer*>(buf_)->input_limit;
}
};
class OutCharBuffer : public std::streambuf {
private:
OutCharBuffer() = delete;
~OutCharBuffer();
public:
using size_type = std::streamsize;
class Slot {
friend class OutCharBuffer;
protected:
std::streambuf* b;
char* emerg_buf;
char* out;
size_type size;
size_type width;
Slot(std::streambuf* b_arg, size_type size_arg, size_type width_arg);
public:
operator char* () const { return out; }
~Slot();
};
template <typename Traits>
static Slot reserve(std::basic_ostream<char, Traits>& os, size_type size)
{
size_type w = os.width();
if (w > 0) os.width(0);
return Slot(os.rdbuf(), size, w);
}
void pbump(size_type n)
{
while (__builtin_expect(n > std::numeric_limits<int>::max(), 0)) {
std::streambuf::pbump(std::numeric_limits<int>::max());
n -= std::numeric_limits<int>::max();
}
std::streambuf::pbump(static_cast<int>(n));
}
};
} // end namespace pm
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
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