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https://github.com/RGBCube/serenity
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8325662186
If we're running more on a TTY that we don't have filesystem access to, we can't rely on open(ttyname(STDOUT_FILENO)). Since all the stdio fd's are opened read/write anyway, we can just read from stdout, even if it feels a bit weird. :^)
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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static int key_fd;
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void wait_for_key()
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{
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printf("\033[7m--[ more ]--\033[0m");
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fflush(stdout);
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char dummy;
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read(key_fd, &dummy, 1);
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printf("\n");
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}
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int main(int argc, char** argv)
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{
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(void)argc;
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(void)argv;
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if (pledge("stdio rpath tty", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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key_fd = STDOUT_FILENO;
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struct winsize ws;
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ioctl(1, TIOCGWINSZ, &ws);
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if (pledge("stdio", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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unsigned lines_printed = 0;
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while (!feof(stdin)) {
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char buffer[BUFSIZ];
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auto* str = fgets(buffer, sizeof(buffer), stdin);
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if (!str)
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break;
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printf("%s", str);
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++lines_printed;
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if ((lines_printed % (ws.ws_row - 1)) == 0) {
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wait_for_key();
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}
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}
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close(key_fd);
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return 0;
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}
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