compat/strtoi.c

/*
 * dhcpcd - DHCP client daemon
 * Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
 * All rights reserved

 * 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 AUTHOR 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 AUTHOR 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 <errno.h>
#include <inttypes.h>
#include <stdlib.h>

#include "strtoi.h"

intmax_t
strtoi(const char * __restrict nptr, char ** __restrict endptr, int base,
    intmax_t lo, intmax_t hi, int *rstatus)
{
	int serrno;
	intmax_t r;
	char *ep;
	int rep;

	if (endptr == NULL)
		endptr = &ep;
	if (rstatus == NULL)
		rstatus = &rep;

	serrno = errno;
	errno = 0;
	r = strtoimax(nptr, endptr, base);
	*rstatus = errno;
	errno = serrno;

	if (*rstatus == 0) {
		if (nptr == *endptr)
			*rstatus = ECANCELED;
		else if (**endptr != '\0')
			*rstatus = ENOTSUP;
	}

	if (r < lo) {
		if (*rstatus == 0)
			*rstatus = ERANGE;
		return lo;
	}
	if (r > hi) {
		if (*rstatus == 0)
			*rstatus = ERANGE;
		return hi;
	}
	return r;
}

uintmax_t
strtou(const char * __restrict nptr, char ** __restrict endptr, int base,
    uintmax_t lo, uintmax_t hi, int *rstatus)
{
	int serrno;
	uintmax_t r;
	char *ep;
	int rep;

	if (endptr == NULL)
		endptr = &ep;
	if (rstatus == NULL)
		rstatus = &rep;

	serrno = errno;
	errno = 0;
	r = strtoumax(nptr, endptr, base);
	*rstatus = errno;
	errno = serrno;

	if (*rstatus == 0) {
		if (nptr == *endptr)
			*rstatus = ECANCELED;
		else if (**endptr != '\0')
			*rstatus = ENOTSUP;
	}

	if (r < lo) {
		if (*rstatus == 0)
			*rstatus = ERANGE;
		return lo;
	}
	if (r > hi) {
		if (*rstatus == 0)
			*rstatus = ERANGE;
		return hi;
	}
	return r;
}