util.c

/* See LICENSE file for copyright and license details. */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xcb/xcb.h>

#include "util.h"

int
pscanf(const char *path, const char *fmt, ...)
{
	FILE *fp;
	va_list ap;
	int n;

	if (!(fp = fopen(path, "r"))) {
		return -1;
	}
	va_start(ap, fmt);
	n = vfscanf(fp, fmt, ap);
	va_end(ap);
	fclose(fp);

	return (n == EOF) ? -1 : n;
}

void
list_init(list_head *head, list_head *prev, list_head *next)
{
	next->prev = head;
	head->next = next;
	head->prev = prev;
	prev->next = head;
}

void
list_add(list_head *head, list_head *entry)
{
	list_init(entry, head, head->next);
}

void
list_add_tail(list_head *head, list_head *entry)
{
	list_init(entry, head->prev, head);
}

void
list_del(list_head *head)
{
	list_head *prev = head->prev;
	list_head *next = head->next;

	next->prev = prev;
	prev->next = next;
}

xcb_atom_t
xcb_atom_get(xcb_connection_t *xcb, const char *name, bool only_exists)
{
	xcb_atom_t atom;
	xcb_intern_atom_reply_t *atom_reply;

	if (!(atom_reply = xcb_intern_atom_reply(xcb, xcb_intern_atom(xcb, only_exists, strlen(name), name), NULL)))
		return 0;

	atom = atom_reply->atom;
	free(atom_reply);

	return atom;
}