/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 * (C) Copyright 2016 Red Hat, Inc.
 */

#include "nm-default.h"

#include "nm-shared-utils.h"

#include <errno.h>

/*****************************************************************************/

/* _nm_utils_ascii_str_to_int64:
 *
 * A wrapper for g_ascii_strtoll, that checks whether the whole string
 * can be successfully converted to a number and is within a given
 * range. On any error, @fallback will be returned and %errno will be set
 * to a non-zero value. On success, %errno will be set to zero, check %errno
 * for errors. Any trailing or leading (ascii) white space is ignored and the
 * functions is locale independent.
 *
 * The function is guaranteed to return a value between @min and @max
 * (inclusive) or @fallback. Also, the parsing is rather strict, it does
 * not allow for any unrecognized characters, except leading and trailing
 * white space.
 **/
gint64
_nm_utils_ascii_str_to_int64 (const char *str, guint base, gint64 min, gint64 max, gint64 fallback)
{
	gint64 v;
	size_t len;
	char buf[64], *s, *str_free = NULL;

	if (str) {
		while (g_ascii_isspace (str[0]))
			str++;
	}
	if (!str || !str[0]) {
		errno = EINVAL;
		return fallback;
	}

	len = strlen (str);
	if (g_ascii_isspace (str[--len])) {
		/* backward search the first non-ws character.
		 * We already know that str[0] is non-ws. */
		while (g_ascii_isspace (str[--len]))
			;

		/* str[len] is now the last non-ws character... */
		len++;

		if (len >= sizeof (buf))
			s = str_free = g_malloc (len + 1);
		else
			s = buf;

		memcpy (s, str, len);
		s[len] = 0;

		nm_assert (len > 0 && len < strlen (str) && len == strlen (s));
		nm_assert (!g_ascii_isspace (str[len-1]) && g_ascii_isspace (str[len]));
		nm_assert (strncmp (str, s, len) == 0);

		str = s;
	}

	errno = 0;
	v = g_ascii_strtoll (str, &s, base);

	if (errno != 0)
		v = fallback;
	else if (s[0] != 0) {
		errno = EINVAL;
		v = fallback;
	} else if (v > max || v < min) {
		errno = ERANGE;
		v = fallback;
	}

	if (G_UNLIKELY (str_free))
		g_free (str_free);
	return v;
}

/*****************************************************************************/

G_DEFINE_QUARK (nm-utils-error-quark, nm_utils_error)

void
nm_utils_error_set_cancelled (GError **error,
                              gboolean is_disposing,
                              const char *instance_name)
{
	if (is_disposing) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_CANCELLED_DISPOSING,
		             "Disposing %s instance",
		             instance_name && *instance_name ? instance_name : "source");
	} else {
		g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CANCELLED,
		                     "Request cancelled");
	}
}

gboolean
nm_utils_error_is_cancelled (GError *error,
                             gboolean consider_is_disposing)
{
	if (error) {
		if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
			return TRUE;
		if (   consider_is_disposing
		    && g_error_matches (error, NM_UTILS_ERROR, NM_UTILS_ERROR_CANCELLED_DISPOSING))
			return TRUE;
	}
	return FALSE;
}

/*****************************************************************************/

/**
 * nm_g_object_set_property:
 * @object: the target object
 * @property_name: the property name
 * @value: the #GValue to set
 * @error: (allow-none): optional error argument
 *
 * A reimplementation of g_object_set_property(), but instead
 * returning an error instead of logging a warning. All g_object_set*()
 * versions in glib require you to not pass invalid types or they will
 * log a g_warning() -- without reporting an error. We don't want that,
 * so we need to hack error checking around it.
 *
 * Returns: whether the value was successfully set.
 */
gboolean
nm_g_object_set_property (GObject *object,
                          const gchar  *property_name,
                          const GValue *value,
                          GError **error)
{
	GParamSpec *pspec;
	nm_auto_unset_gvalue GValue tmp_value = G_VALUE_INIT;
	GObjectClass *klass;

	g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
	g_return_val_if_fail (property_name != NULL, FALSE);
	g_return_val_if_fail (G_IS_VALUE (value), FALSE);
	g_return_val_if_fail (!error || !*error, FALSE);

	/* g_object_class_find_property() does g_param_spec_get_redirect_target(),
	 * where we differ from a plain g_object_set_property(). */
	pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), property_name);

	if (!pspec) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("object class '%s' has no property named '%s'"),
		             G_OBJECT_TYPE_NAME (object),
		             property_name);
		return FALSE;
	}
	if (!(pspec->flags & G_PARAM_WRITABLE)) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("property '%s' of object class '%s' is not writable"),
		             pspec->name,
		             G_OBJECT_TYPE_NAME (object));
		return FALSE;
	}
	if ((pspec->flags & G_PARAM_CONSTRUCT_ONLY)) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("construct property \"%s\" for object '%s' can't be set after construction"),
		             pspec->name, G_OBJECT_TYPE_NAME (object));
		return FALSE;
	}

	klass = g_type_class_peek (pspec->owner_type);
	if (klass == NULL) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("'%s::%s' is not a valid property name; '%s' is not a GObject subtype"),
		            g_type_name (pspec->owner_type), pspec->name, g_type_name (pspec->owner_type));
		return FALSE;
	}

	/* provide a copy to work from, convert (if necessary) and validate */
	g_value_init (&tmp_value, pspec->value_type);
	if (!g_value_transform (value, &tmp_value)) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("unable to set property '%s' of type '%s' from value of type '%s'"),
		             pspec->name,
		             g_type_name (pspec->value_type),
		             G_VALUE_TYPE_NAME (value));
		return FALSE;
	}
	if (   g_param_value_validate (pspec, &tmp_value)
	    && !(pspec->flags & G_PARAM_LAX_VALIDATION)) {
		gs_free char *contents = g_strdup_value_contents (value);

		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             _("value \"%s\" of type '%s' is invalid or out of range for property '%s' of type '%s'"),
		             contents,
		             G_VALUE_TYPE_NAME (value),
		             pspec->name,
		             g_type_name (pspec->value_type));
		return FALSE;
	}

	g_object_set_property (object, property_name, &tmp_value);
	return TRUE;
}

/*****************************************************************************/
