Source code of Windows XP (NT5)
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//////////////////////////////////////////////////////////////////////////////////////////////////
//
// string.c
//
// This file contains most commonly used string operation. ALl the setup project should link here
// or add the common utility here to avoid duplicating code everywhere or using CRT runtime.
//
// Created 4\15\997 inateeg
//
///////////////////////////////////////////////////////////////////////////////////////////////////
#include <windows.h>
#include "utils2.h"
//=================================================================================================
//
// copied from msdev\crt\src\atox.c
//
// long AtoL(char *nptr) - Convert string to long
//
// Purpose:
// Converts ASCII string pointed to by nptr to binary.
// Overflow is not detected.
//
// Entry:
// nptr = ptr to string to convert
//
// Exit:
// return long int value of the string
//
// Exceptions:
// None - overflow is not detected.
//
//=================================================================================================
long AtoL(const TCHAR *nptr)
{
int c; /* current char */
long total; /* current total */
int sign; /* if '-', then negative, otherwise positive */
// NOTE: no need to worry about DBCS chars here because IsSpace(c), IsDigit(c),
// '+' and '-' are "pure" ASCII chars, i.e., they are neither DBCS Leading nor
// DBCS Trailing bytes -- pritvi
/* skip whitespace */
while ( IsSpace((int)(unsigned TCHAR)*nptr) )
++nptr;
c = (int)(unsigned TCHAR)*nptr++;
sign = c; /* save sign indication */
if (c == '-' || c == '+')
c = (int)(unsigned TCHAR)*nptr++; /* skip sign */
total = 0;
while (IsDigit(c)) {
total = 10 * total + (c - '0'); /* accumulate digit */
c = (int)(unsigned TCHAR)*nptr++; /* get next char */
}
if (sign == '-')
return -total;
else
return total; /* return result, negated if necessary */
}