/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2013 David Chisnall
 * All rights reserved.
 *
 * This software was developed by SRI International and the University of
 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
 * ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <string>
#include <functional>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctype.h>
#include <libgen.h>

#include "util.hh"

using std::string;

namespace dtc
{

void
push_string(byte_buffer &buffer, const string &s, bool escapes)
{
        size_t length = s.size();
        for (size_t i=0 ; i<length ; ++i)
        {
                uint8_t c = s[i];
                if (escapes && c == '\\' && i+1 < length)
                {
                        c = s[++i];
                        switch (c)
                        {
                                // For now, we just ignore invalid escape sequences.
                                default:
                                case '"':
                                case '\'':
                                case '\\':
                                        break;
                                case 'a':
                                        c = '\a';
                                        break;
                                case 'b':
                                        c = '\b';
                                        break;
                                case 't':
                                        c = '\t';
                                        break;
                                case 'n':
                                        c = '\n';
                                        break;
                                case 'v':
                                        c = '\v';
                                        break;
                                case 'f':
                                        c = '\f';
                                        break;
                                case 'r':
                                        c = '\r';
                                        break;
                                case '0'...'7':
                                {
                                        int v = digittoint(c);
                                        if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
                                        {
                                                v <<= 3;
                                                v |= digittoint(s[i+1]);
                                                i++;
                                                if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
                                                {
                                                        v <<= 3;
                                                        v |= digittoint(s[i+1]);
                                                }
                                        }
                                        c = (uint8_t)v;
                                        break;
                                }
                                case 'x':
                                {
                                        ++i;
                                        if (i >= length)
                                        {
                                                break;
                                        }
                                        int v = digittoint(s[i]);
                                        if (i+1 < length && ishexdigit(s[i+1]))
                                        {
                                                v <<= 4;
                                                v |= digittoint(s[++i]);
                                        }
                                        c = (uint8_t)v;
                                        break;
                                }
                        }
                }
                buffer.push_back(c);
        }
}

namespace {
string
dirbasename(std::function<char*(char*)> fn, const string &s)
{
        if (s == string())
        {
                return string();
        }
        std::unique_ptr<char, decltype(free)*> str = {strdup(s.c_str()), free};
        string dn(fn(str.get()));
        return dn;
}
}

string dirname(const string &s)
{
        return dirbasename(::dirname, s);
}

string basename(const string &s)
{
        return dirbasename(::basename, s);
}
} // namespace dtc