shadow/lib/getulong.c

/*
 * Copyright (c) 2007 - 2009, Nicolas François
 * 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.
 * 3. The name of the copyright holders or contributors may not be used to
 *    endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * HOLDERS 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 <config.h>

#ident "$Id: getlong.c 2763 2009-04-23 09:57:03Z nekral-guest $"

#include <stdlib.h>
#include <errno.h>
#include "prototypes.h"

/*
 * getulong - extract an unsigned long integer provided by the numstr string in *result
 *
 * It supports decimal, hexadecimal or octal representations.
 *
 * Returns 0 on failure, 1 on success.
 */
int getulong (const char *numstr, /*@out@*/unsigned long int *result)
{
	long long int val;
	char *endptr;

	errno = 0;
	val = strtoll (numstr, &endptr, 0);
	if (    ('\0' == *numstr)
	     || ('\0' != *endptr)
	     || (ERANGE == errno)
	     /*@+ignoresigns@*/
	     || (val != (unsigned long int)val)
	     /*@=ignoresigns@*/
	   ) {
		return 0;
	}

	*result = (unsigned long int)val;
	return 1;
}