/*      $NetBSD: support.c,v 1.1 2025/02/06 19:35:28 christos Exp $     */

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: support.c,v 1.1 2025/02/06 19:35:28 christos Exp $");

#include <assert.h>
#include <limits.h>
#include <errno.h>
#include <netdb.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tables.h"
#include "support.h"

static bool
parse_numeric(const char *string, int *rv)
{
       char *end;
       long value;

       errno = 0;
       value = strtol(string, &end, 0);
       if ((string[0] == '\0') || (*end != '\0'))
               return false;
       if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
               return false;
       if ((value > INT_MAX) || (value < INT_MIN))
               return false;
       *rv = (int)value;
       return true;
}

bool
parse_af(const char *string, int *afp)
{

       return parse_numeric_tabular(string, afp, address_families,
           __arraycount(address_families));
}

bool
parse_protocol(const char *string, int *protop)
{
       struct protoent *protoent;

       if (parse_numeric(string, protop))
               return true;

       protoent = getprotobyname(string);
       if (protoent == NULL)
               return false;

       *protop = protoent->p_proto;
       return true;
}

bool
parse_socktype(const char *string, int *typep)
{

       return parse_numeric_tabular(string, typep, socket_types,
           __arraycount(socket_types));
}

bool
parse_numeric_tabular(const char *string, int *valuep,
   const char *const *table, size_t n)
{

       assert((uintmax_t)n <= (uintmax_t)INT_MAX);

       if (parse_numeric(string, valuep))
               return true;

       for (size_t i = 0; i < n; i++)
               if ((table[i] != NULL) && (strcmp(string, table[i]) == 0)) {
                       *valuep = (int)i;
                       return true;
               }
       return false;
}