atoi64.c

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/*
 * COPYRIGHT:   See COPYING in the top level directory
 * PROJECT:     ReactOS system libraries
 * FILE:        lib/sdk/crt/string/atoi64.c
 * PURPOSE:     Unknown
 * PROGRAMER:   Unknown
 * UPDATE HISTORY:
 *              25/11/05: Added license header
 */
 
#include <precomp.h>
 
/*
 * @implemented
 */
__int64
CDECL
_atoi64(const char *nptr)
{
  char *s = (char *)nptr;
  __int64 acc = 0;
  int neg = 0;
 
  if (nptr == NULL)
    return 0;
 
  while(isspace((int)*s))
    s++;
  if (*s == '-')
    {
      neg = 1;
      s++;
    }
  else if (*s == '+')
    s++;
 
  while (isdigit((int)*s))
    {
      acc = 10 * acc + ((int)*s - '0');
      s++;
    }
 
  if (neg)
    acc *= -1;
  return acc;
}