/*
 * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "telescope.h"

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

int
mark_nonblock(int fd)
{
	int flags;

	if ((flags = fcntl(fd, F_GETFL)) == -1)
                return 0;
	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
                return 0;
	return 1;
}

int
has_prefix(const char *str, const char *prfx)
{
	size_t i;

	for (i = 0; str[i] != '\0' && prfx[i] != '\0'; ++i)
		if (str[i] != prfx[i])
			return 0;
	return prfx[i] == '\0';
}

int
unicode_isspace(uint32_t cp)
{
	if (cp < INT8_MAX)
		return isspace(cp);
	return 0;
}

int
unicode_isgraph(uint32_t cp)
{
	if (cp < INT8_MAX)
		return isgraph(cp);
	return 1;
}

void
dispatch_imsg(struct imsgbuf *ibuf, imsg_handlerfn **handlers, size_t size)
{
	struct imsg	imsg;
	size_t		datalen, i;
	ssize_t		n;

	if ((n = imsg_read(ibuf)) == -1) {
		if (errno == EAGAIN || errno == EWOULDBLOCK)
			return;
                _exit(1);
	}

	if (n == 0)
		_exit(1);

	for (;;) {
		if ((n = imsg_get(ibuf, &imsg)) == -1)
			_exit(1);
		if (n == 0)
			return;
		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
		i = imsg.hdr.type;
		if (i > (size / sizeof(imsg_handlerfn*)) || handlers[i] == NULL)
			abort();
		handlers[i](&imsg, datalen);
		imsg_free(&imsg);
	}
}