serenity/Userland/Libraries/LibC/termcap.cpp

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 <AK/Debug.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <termcap.h>

extern "C" {

char PC;
char* UP;
char* BC;

int tgetent([[maybe_unused]] char* bp, [[maybe_unused]] const char* name)
{
#if TERMCAP_DEBUG
    fprintf(stderr, "tgetent: bp=%p, name='%s'\n", bp, name);
#endif
    PC = '\0';
    BC = const_cast<char*>("\033[D");
    UP = const_cast<char*>("\033[A");
    return 1;
}

static HashMap<String, const char*>* caps = nullptr;

static void ensure_caps()
{
    if (caps)
        return;
    caps = new HashMap<String, const char*>;
    caps->set("DC", "\033[%p1%dP");
    caps->set("IC", "\033[%p1%d@");
    caps->set("ce", "\033[K");
    caps->set("cl", "\033[H\033[J");
    caps->set("cr", "\015");
    caps->set("dc", "\033[P");
    caps->set("ei", "");
    caps->set("ic", "");
    caps->set("im", "");
    caps->set("kd", "\033[B");
    caps->set("kl", "\033[D");
    caps->set("kr", "\033[C");
    caps->set("ku", "\033[A");
    caps->set("ks", "");
    caps->set("ke", "");
    caps->set("le", "\033[D");
    caps->set("mm", "");
    caps->set("mo", "");
    caps->set("pc", "");
    caps->set("up", "\033[A");
    caps->set("vb", "");
    caps->set("am", "");
    caps->set("@7", "");
    caps->set("kH", "");
    caps->set("kI", "\033[L");
    caps->set("kh", "\033[H");
    caps->set("vs", "");
    caps->set("ve", "");
    caps->set("E3", "");
    caps->set("kD", "");
    caps->set("nd", "\033[C");

    caps->set("co", "80");
    caps->set("li", "25");
}

// Unfortunately, tgetstr() doesn't accept a size argument for the buffer
// pointed to by area, so we have to use bare strcpy().
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

char* tgetstr(const char* id, char** area)
{
    ensure_caps();
#if TERMCAP_DEBUG
    fprintf(stderr, "tgetstr: id='%s'\n", id);
#endif
    auto it = caps->find(id);
    if (it != caps->end()) {
        char* ret = *area;
        const char* val = (*it).value;
        strcpy(*area, val);
        *area += strlen(val) + 1;
        return ret;
    }
    fprintf(stderr, "tgetstr: missing cap id='%s'\n", id);
    return nullptr;
}

#pragma GCC diagnostic pop

int tgetflag([[maybe_unused]] const char* id)
{
#if TERMCAP_DEBUG
    fprintf(stderr, "tgetflag: '%s'\n", id);
#endif
    auto it = caps->find(id);
    if (it != caps->end())
        return 1;
    return 0;
}

int tgetnum(const char* id)
{
#if TERMCAP_DEBUG
    fprintf(stderr, "tgetnum: '%s'\n", id);
#endif
    auto it = caps->find(id);
    if (it != caps->end())
        return atoi((*it).value);
    VERIFY_NOT_REACHED();
}

static Vector<char> s_tgoto_buffer;
char* tgoto([[maybe_unused]] const char* cap, [[maybe_unused]] int col, [[maybe_unused]] int row)
{
    auto cap_str = String(cap);
    cap_str.replace("%p1%d", String::number(col));
    cap_str.replace("%p2%d", String::number(row));

    s_tgoto_buffer.clear_with_capacity();
    s_tgoto_buffer.ensure_capacity(cap_str.length());
    (void)cap_str.copy_characters_to_buffer(s_tgoto_buffer.data(), cap_str.length());
    return s_tgoto_buffer.data();
}

int tputs(const char* str, [[maybe_unused]] int affcnt, int (*putc)(int))
{
    size_t len = strlen(str);
    for (size_t i = 0; i < len; ++i)
        putc(str[i]);
    return 0;
}
}