source: trunk/minix/lib/ansi/atol.c@ 10

/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Header: /cvsup/minix/src/lib/ansi/atol.c,v 1.1.1.1 2005/04/21 14:56:04 beng Exp $ */

#include        <ctype.h>
#include        <stdlib.h>

/* We do not use strtol here for backwards compatibility in behaviour on
   overflow.
*/
long
atol(register const char *nptr)
{
        long total = 0;
        int minus = 0;

        while (isspace(*nptr)) nptr++;
        if (*nptr == '+') nptr++;
        else if (*nptr == '-') {
                minus = 1;
                nptr++;
        }
        while (isdigit(*nptr)) {
                total *= 10;
                total += (*nptr++ - '0');
        }
        return minus ? -total : total;
}