/*
 * utils.c: miscellaneous utilities
 *
 * Copyright (c) 2013, Přemysl Janouch <p.janouch@gmail.com>
 * All rights reserved.
 *
 * Permission to use, copy, modify, and/or 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 <glib.h>
#include <gio/gio.h>
#include <stdlib.h>
#include <errno.h>

#include <curses.h>
#include <termios.h>
#ifndef TIOCGWINSZ
#include <sys/ioctl.h>
#endif  // ! TIOCGWINSZ

#include "config.h"
#include "utils.h"


/** Read the whole stream into a byte array. */
gboolean
stream_read_all (GByteArray *ba, GInputStream *is, GError **error)
{
	guint8 buffer[1024 * 64];
	gsize bytes_read;

	while (g_input_stream_read_all (is, buffer, sizeof buffer,
		&bytes_read, NULL, error))
	{
		g_byte_array_append (ba, buffer, bytes_read);
		if (bytes_read < sizeof buffer)
			return TRUE;
	}
	return FALSE;
}

/** Read a null-terminated string from a data input stream. */
gchar *
stream_read_string (GDataInputStream *dis, GError **error)
{
	gsize length;
	gchar *s = g_data_input_stream_read_upto (dis, "", 1, &length, NULL, error);
	if (!s)
		return NULL;

	GError *err = NULL;
	g_data_input_stream_read_byte (dis, NULL, &err);
	if (err)
	{
		g_free (s);
		g_propagate_error (error, err);
		return NULL;
	}

	return s;
}

static bool
xstrtoul (unsigned long *out, const char *s, int base)
{
	char *end;
	errno = 0;
	*out = strtoul (s, &end, base);
	return errno == 0 && !*end && end != s;
}

// Didn't want to have this ugly piece of code in the main source file;
// the standard endwin/refresh sequence makes the terminal flicker.
void
update_curses_terminal_size (void)
{
#if defined (HAVE_RESIZETERM) && defined (TIOCGWINSZ)
	struct winsize size;
	if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
	{
		char *row = getenv ("LINES");
		char *col = getenv ("COLUMNS");
		unsigned long tmp;
		resizeterm (
			(row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row,
			(col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col);
	}
#else  // HAVE_RESIZETERM && TIOCGWINSZ
	endwin ();
	refresh ();
#endif  // HAVE_RESIZETERM && TIOCGWINSZ
}