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/* ****************************************************************************
 * wes.c -- initialisation, gestion, utilisation d'un serveur WES.
 * Copyright (C) 2018 Thomas Touhey <thomas@touhey.fr>
 *
 * This project is governed by the CeCILL license under French law and
 * abiding by the rules of distribution of free software. You can use,
 * modify and/or redistribute the software under the terms of the
 * CeCILL license as circulated by CEA, CNRS and INRIA at the
 * following URL: "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty and the project's author, the holder of the
 * economic rights, and the successive licensors have only limited liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading, using, modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean that it is complicated to manipulate, and that also therefore
 * means that it is reserved for developers and experienced professionals
 * having in-depth computer knowledge. Users are therefore encouraged to load
 * and test the software's suitability as regards their requirements in
 * conditions enabling the security of their systems and/or data to be
 * ensured and, more generally, to use and operate it in the same conditions
 * as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 * ************************************************************************* */
#include "internals.h"
#include <unistd.h>

/* Nom vide, afin d'éviter à avoir à allouer une chaîne vide pour avoir
 * quelque chose de « mutable » globalement (en vrai on fait le maximum pour
 * ne pas y toucher). */

static char *empty_name = "";

/* `init_wes_base()`: Initialiser les composants de base d'une ressource de
 * type serveur WES. */

int init_wes_base(wes_t *wes, wesif_t const *iface)
{
	wes->valid = 1;
	wes->id = 0;
	wes->next = NULL;
	wes->prev = NULL;
	wes->iface = iface;
	wes->lastobj = NULL;
	wes->name = empty_name;

	return (WROK);
}

/* `deinit_wes_base()`: Supprimer les composants d'une ressource de
 * type serveur WES. */

int deinit_wes_base(wes_t *wes)
{
	set_name(wes, "");
	set_obj_to_free(wes, NULL);

	return (WROK);
}

/* `set_obj_to_free()`: faire en sorte qu'un objet soit libéré tantôt. */

void set_obj_to_free(wes_t *wes, void *vobj)
{
	wesfreemem_t **obj = (void*)vobj;

	if (wes->lastobj) {
		(**wes->lastobj)((void*)*wes->lastobj);
		wes->lastobj = NULL;
	}

	if (obj && *obj)
		wes->lastobj = (wesfreemem_t **)obj;
}

/* ---
 * Gestion d'un nom de serveur WES.
 * --- */

#define MAX_NAME_SIZE 16
#define VALIDCAR(C) \
	!!strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \
		"0123456789-", (C))

/* `name_valid_length()`: Longueur d'un nom après sanitization (prédiction). */

static size_t name_valid_length(const char *s)
{
	size_t len = 0;

	for (; *s && len < MAX_NAME_SIZE; s++)
		len += VALIDCAR(*s);

	return (len);
}

/* `prep_name()`: Duplication d'un nom en sanitizant. */

int prep_name(char **dst, const char *src)
{
	char *name, *buf;
	size_t len;

	*dst = NULL;
	len = name_valid_length(src);

	if (!len) {
		*dst = empty_name;
		return (WROK);
	}
	if (!(name = malloc(len + 1)))
		return (WRALLOC);
	buf = name;

	for (; len; len--, src++)
		if (VALIDCAR(*src))
			*buf++ = *src;
	*buf = '\0';

	*dst = name;
	return (WROK);
}

/* `prep_valid_name()`: Duplication d'un nom avec _validation_, et non
 * sanitization comme la fonction précédente. */

int prep_valid_name(char **dst, const char *src)
{
	char *name, *s;
	size_t len = 0;

	*dst = NULL;

	if (!(name = memchr(src, '\0', MAX_NAME_SIZE)))
		return (WRVAL);
	len = (size_t)(name - src);

	if (!len) {
		*dst = empty_name;
		return (WROK);
	}

	if (!(name = malloc(len + 1)))
		return (WRALLOC);
	s = name;

	for (; len; len--) {
		if (!strchr("abcdefghijklmnopqrstuvwxyz0123456789-", *src)) {
			free(name);
			return (WRVAL);
		}

		*s++ = *src++;
	}
	*s = '\0';

	*dst = name;
	return (WROK);
}

/* `free_name()`: Suppression d'un nom. */

void free_name(char *name)
{
	if (name != empty_name)
		free(name);
}

/* `assign_name()`: Assigner un nom à un serveur WES. */

int assign_name(wes_t *wes, char *name)
{
	free_name(wes->name);
	wes->name = name;
	return (WROK);
}

/* `set_name()`: Définir le nom d'un serveur WES. */

int set_name(wes_t *wes, const char *name)
{
	char *newname;
	int err;

	if (!strcmp(name, wes->name))
		return (WROK);
	if ((err = prep_name(&newname, name)))
		return (err);
	if ((err = assign_name(wes, newname))) {
		free_name(newname);
		return (err);
	}

	return (WROK);
}