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/*
* Copyright (C) 2022 Mikhail Burakov. This file is part of toolbox.
*
* toolbox 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 3 of the License, or
* (at your option) any later version.
*
* toolbox 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.
*
* You should have received a copy of the GNU General Public License
* along with toolbox. If not, see <https://www.gnu.org/licenses/>.
*/
#include "io_muxer.h"
#include <poll.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
struct IoMuxerTask {
void (*fun)(void*);
void* user;
};
static bool AppendRecord(struct IoMuxer* io_muxer) {
if (io_muxer->size < io_muxer->alloc) return true;
size_t alloc = io_muxer->alloc + 1;
struct pollfd* pfds = realloc(io_muxer->pfds, alloc * sizeof(struct pollfd));
if (!pfds) return false;
io_muxer->pfds = pfds;
struct IoMuxerTask* tasks =
realloc(io_muxer->tasks, alloc * sizeof(struct IoMuxerTask));
if (!tasks) return false;
io_muxer->tasks = tasks;
io_muxer->alloc = alloc;
return true;
}
static void CompressRecords(struct IoMuxer* io_muxer) {
for (size_t forward = 0, reverse = io_muxer->size - 1; io_muxer->size;) {
while (forward < reverse && !io_muxer->pfds[forward].revents) forward++;
while (forward < reverse && io_muxer->pfds[reverse].revents) reverse--;
if (forward == reverse) {
if (!io_muxer->pfds[forward].revents) forward++;
io_muxer->size = forward;
return;
}
struct pollfd pfd = io_muxer->pfds[forward];
io_muxer->pfds[forward] = io_muxer->pfds[reverse];
io_muxer->pfds[reverse] = pfd;
struct IoMuxerTask task = io_muxer->tasks[forward];
io_muxer->tasks[forward] = io_muxer->tasks[reverse];
io_muxer->tasks[reverse] = task;
}
}
void IoMuxerCreate(struct IoMuxer* io_muxer) {
memset(io_muxer, 0, sizeof(struct IoMuxer));
}
bool IoMuxerOnRead(struct IoMuxer* io_muxer, int fd, void (*fun)(void*),
void* user) {
if (!AppendRecord(io_muxer)) return false;
struct pollfd pfd = {.fd = fd, .events = POLLIN};
struct IoMuxerTask task = {.fun = fun, .user = user};
io_muxer->pfds[io_muxer->size] = pfd;
io_muxer->tasks[io_muxer->size] = task;
io_muxer->size++;
return true;
}
bool IoMuxerOnWrite(struct IoMuxer* io_muxer, int fd, void (*fun)(void*),
void* user) {
if (!AppendRecord(io_muxer)) return false;
struct pollfd pfd = {.fd = fd, .events = POLLOUT};
struct IoMuxerTask task = {.fun = fun, .user = user};
io_muxer->pfds[io_muxer->size] = pfd;
io_muxer->tasks[io_muxer->size] = task;
io_muxer->size++;
return true;
}
enum IoMuxerResult IoMuxerIterate(struct IoMuxer* io_muxer, int timeout) {
for (;;) {
CompressRecords(io_muxer);
int result = poll(io_muxer->pfds, io_muxer->size, timeout);
switch (result) {
case -1:
return kIoMuxerResultError;
case 0:
return kIoMuxerResultTimeout;
default:
break;
}
for (size_t i = 0; i < io_muxer->size; i++) {
if (io_muxer->pfds[i].revents)
io_muxer->tasks[i].fun(io_muxer->tasks[i].user);
}
}
}
void IoMuxerDestroy(struct IoMuxer* io_muxer) {
free(io_muxer->pfds);
free(io_muxer->tasks);
}
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