graphene/Pal/lib/string/atoi.c

/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include "api.h"

long strtol(const char *s, char **endptr, int base)
{
	int neg = 0;
	long val = 0;

	// gobble initial whitespace
	while (*s == ' ' || *s == '\t')
		s++;

	// plus/minus sign
	if (*s == '+')
		s++;
	else if (*s == '-')
		s++, neg = 1;

	// hex or octal base prefix
	if ((base == 0 || base == 16) && (s[0] == '0' && s[1] == 'x'))
		s += 2, base = 16;
	else if (base == 0 && s[0] == '0')
		s++, base = 8;
	else if (base == 0)
		base = 10;

	// digits
	while (1) {
		int dig;

		if (*s >= '0' && *s <= '9')
			dig = *s - '0';
		else if (*s >= 'a' && *s <= 'z')
			dig = *s - 'a' + 10;
		else if (*s >= 'A' && *s <= 'Z')
			dig = *s - 'A' + 10;
		else
			break;
		if (dig >= base)
			break;
		s++, val = (val * base) + dig;
		// we don't properly detect overflow!
	}

	if (endptr)
		*endptr = (char *) s;
	return (neg ? -val : val);
}

/* Convert a string to an int.  */
int atoi (const char *nptr)
{
    return (int) strtol (nptr, (char **) NULL, 10);
}

/* Convert a string to an long int.  */
long int atol (const char *nptr)
{
    return strtol (nptr, (char **) NULL, 10);
}