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/***************************************************************************
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io.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "io.h"
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#include "log.h"
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#include "common.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <time.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <sys/ioctl.h>
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#include <sys/epoll.h>
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static char stdout_buf[BUFSIZ];
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static int stdout_buf_len = 0;
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static int stdout_buf_offset = 0;
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int prints(const char *format, ...)
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{
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char buf[BUFSIZ];
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va_list args;
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int ret;
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va_start(args, format);
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ret = vsnprintf(buf, sizeof(buf), format, args);
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va_end(args);
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if (ret > 0)
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{
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if (stdout_buf_len + ret > BUFSIZ)
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{
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iflush();
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}
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if (stdout_buf_len + ret <= BUFSIZ)
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{
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memcpy(stdout_buf + stdout_buf_len, buf, (size_t)ret);
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stdout_buf_len += ret;
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}
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else
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{
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errno = EAGAIN;
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ret = (BUFSIZ - stdout_buf_len - ret);
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}
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}
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return ret;
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}
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int outc(char c)
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{
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int ret;
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if (stdout_buf_len + 1 > BUFSIZ)
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{
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iflush();
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}
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if (stdout_buf_len + 1 <= BUFSIZ)
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{
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stdout_buf[stdout_buf_len] = c;
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stdout_buf_len++;
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}
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else
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{
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errno = EAGAIN;
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ret = -1;
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}
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return ret;
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}
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int iflush()
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{
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int flags;
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struct epoll_event ev, events[MAX_EVENTS];
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int nfds, epollfd;
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int retry;
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int ret = 0;
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epollfd = epoll_create1(0);
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if (epollfd < 0)
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{
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log_error("epoll_create1() error (%d)\n", errno);
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return -1;
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}
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ev.events = EPOLLOUT;
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ev.data.fd = STDOUT_FILENO;
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if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDOUT_FILENO, &ev) == -1)
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{
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log_error("epoll_ctl(STDOUT_FILENO) error (%d)\n", errno);
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return -1;
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}
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// Set STDOUT as non-blocking
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flags = fcntl(STDOUT_FILENO, F_GETFL, 0);
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fcntl(STDOUT_FILENO, F_SETFL, flags | O_NONBLOCK);
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// Retry wait / flush for at most 3 times
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retry = 3;
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while (retry > 0 && !SYS_server_exit)
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{
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retry--;
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nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
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if (nfds < 0)
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{
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if (errno != EINTR)
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{
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log_error("epoll_wait() error (%d)\n", errno);
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break;
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}
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continue;
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}
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else if (nfds == 0) // timeout
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{
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continue;
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}
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for (int i = 0; i < nfds; i++)
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{
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if (events[i].data.fd == STDOUT_FILENO)
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{
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while (stdout_buf_offset < stdout_buf_len && !SYS_server_exit) // write until complete or error
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{
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ret = (int)write(STDOUT_FILENO, stdout_buf + stdout_buf_offset, (size_t)(stdout_buf_len - stdout_buf_offset));
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if (ret < 0)
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{
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if (errno == EAGAIN || errno == EWOULDBLOCK)
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{
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break;
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}
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else if (errno == EINTR)
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{
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continue;
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}
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else
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{
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log_error("write(STDOUT) error (%d)\n", errno);
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retry = 0;
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break;
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}
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}
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else if (ret == 0) // broken pipe
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{
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retry = 0;
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break;
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}
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else
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{
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stdout_buf_offset += ret;
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if (stdout_buf_offset >= stdout_buf_len) // flush buffer completely
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{
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ret = 0;
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stdout_buf_offset = 0;
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stdout_buf_len = 0;
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retry = 0;
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break;
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}
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continue;
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}
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}
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}
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}
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}
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// Restore STDOUT flags
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fcntl(STDOUT_FILENO, F_SETFL, flags);
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return ret;
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}
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int igetch(int clear_buf)
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{
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// static input buffer
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static unsigned char buf[LINE_BUFFER_LEN];
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static ssize_t len = 0;
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static int pos = 0;
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struct epoll_event ev, events[MAX_EVENTS];
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int nfds, epollfd;
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unsigned char tmp[LINE_BUFFER_LEN];
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int out = '\0';
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int in_esc = 0;
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int in_ascii = 0;
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int in_control = 0;
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int i = 0;
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int flags;
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if (clear_buf)
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{
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pos = 0;
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len = 0;
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return '\0';
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}
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epollfd = epoll_create1(0);
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if (epollfd < 0)
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{
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log_error("epoll_create1() error (%d)\n", errno);
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return -1;
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}
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ev.events = EPOLLIN;
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ev.data.fd = STDIN_FILENO;
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if (epoll_ctl(epollfd, EPOLL_CTL_ADD, STDIN_FILENO, &ev) == -1)
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{
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log_error("epoll_ctl(STDIN_FILENO) error (%d)\n", errno);
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return -1;
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}
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flags = fcntl(STDIN_FILENO, F_GETFL, 0);
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fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);
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while (!SYS_server_exit && pos >= len)
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{
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nfds = epoll_wait(epollfd, events, MAX_EVENTS, 100); // 0.1 second
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if (nfds < 0)
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{
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if (errno != EINTR)
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{
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log_error("epoll_wait() error (%d)\n", errno);
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fcntl(STDIN_FILENO, F_SETFL, flags);
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return KEY_NULL;
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}
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continue;
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}
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else if (nfds == 0)
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{
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fcntl(STDIN_FILENO, F_SETFL, flags);
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return KEY_TIMEOUT;
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}
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for (int i = 0; i < nfds; i++)
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{
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if (events[i].data.fd == STDIN_FILENO)
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{
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while (!SYS_server_exit) // read until complete or error
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{
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len = read(STDIN_FILENO, buf, sizeof(buf));
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if (len < 0)
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{
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if (errno == EAGAIN || errno == EWOULDBLOCK)
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{
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fcntl(STDIN_FILENO, F_SETFL, flags);
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return KEY_TIMEOUT;
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}
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else if (errno == EINTR)
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{
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continue;
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}
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else
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{
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log_error("read(STDIN) error (%d)\n", errno);
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fcntl(STDIN_FILENO, F_SETFL, flags);
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return KEY_NULL;
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}
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}
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else if (len == 0) // broken pipe
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{
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fcntl(STDIN_FILENO, F_SETFL, flags);
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return KEY_NULL;
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}
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pos = 0;
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break;
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}
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}
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}
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// For debug
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// for (j = 0; j < len; j++)
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// log_std ("<--[%u]\n", (buf[j] + 256) % 256);
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}
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fcntl(STDIN_FILENO, F_SETFL, flags);
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while (pos < len)
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{
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unsigned char c = buf[pos++];
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if (c == KEY_CONTROL)
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{
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if (in_control == 0)
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{
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in_control = 1;
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i = 0;
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continue;
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}
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}
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if (in_control)
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{
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tmp[i++] = c;
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if (i >= 2)
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{
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out = (int)tmp[0] * 256 + tmp[1];
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in_control = 0;
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break;
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}
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continue;
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}
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if (c == ESC_KEY)
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{
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if (in_esc == 0)
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{
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in_esc = 1;
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in_ascii = 1;
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i = 0;
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continue;
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}
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else
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{
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out = ESC_KEY;
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in_esc = 0;
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break;
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}
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}
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in_esc = 0;
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if (in_ascii)
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{
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tmp[i++] = c;
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if (c == 'm')
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{
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in_ascii = 0;
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continue;
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}
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if (i == 2 && c >= 'A' && c <= 'D')
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{
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in_ascii = 0;
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switch (c)
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{
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case 'A':
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out = KEY_UP;
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break;
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case 'B':
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out = KEY_DOWN;
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break;
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case 'C':
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out = KEY_RIGHT;
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break;
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case 'D':
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out = KEY_LEFT;
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break;
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}
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break;
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}
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if (i == 3 && tmp[0] == 91 && tmp[2] == 126)
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{
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in_ascii = 0;
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switch (tmp[1])
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{
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case 49:
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out = KEY_HOME;
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break;
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case 51:
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out = KEY_DEL;
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break;
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case 52:
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out = KEY_END;
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break;
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case 53:
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out = KEY_PGUP;
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break;
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case 54:
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out = KEY_PGDN;
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break;
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}
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break;
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}
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continue;
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}
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out = ((int)c + 256) % 256;
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break;
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}
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// for debug
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// log_std ("-->[%u]\n", out);
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return out;
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}
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int igetch_t(long int sec)
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{
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int ch;
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time_t t_begin = time(0);
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do
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{
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ch = igetch(0);
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} while (!SYS_server_exit && ch == KEY_TIMEOUT && (time(0) - t_begin < sec));
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return ch;
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}
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