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// atol.cpp
// based on:
// LIBCTINY - Matt Pietrek 2001
// MSDN Magazine, January 2001
// 08/12/06 (mv)
#include <stdlib.h>
#include <ctype.h>
#include "libct.h"
BEGIN_EXTERN_C
long atol(const char *str)
{
while (isspace(*str)) // skip whitespace
++str;
int cur = *str++;
int neg = cur; // Save the negative sign, if it exists
if (cur == '-' || cur == '+')
cur = *str++;
// While we have digits, add 'em up.
long total = 0;
while (isdigit(cur))
{
total = 10*total + (cur-'0'); // Add this digit to the total.
cur = *str++; // Do the next character.
}
// If we have a negative sign, convert the value.
if (neg == '-')
return -total;
else
return total;
}
int atoi(const char *str)
{
return (int)atol(str);
}
long wtol(const wchar_t *str)
{
while (iswspace(*str)) // skip whitespace
++str;
wint_t cur = *str++;
wint_t neg = cur; // Save the negative sign, if it exists
if (cur == L'-' || cur == L'+')
cur = *str++;
// While we have digits, add 'em up.
long total = 0;
while (iswdigit(cur))
{
total = 10*total + (cur-L'0'); // Add this digit to the total.
cur = *str++; // Do the next character.
}
// If we have a negative sign, convert the value.
if (neg == L'-')
return -total;
else
return total;
}
int wtoi(const wchar_t *str)
{
return (int)wtol(str);
}
END_EXTERN_C
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Mike_V is currently a student at UCLA.
After a few years on the Dark Side, he reformed and now chants "Death to VB." His computer-related interests include C++, C#, and ASP.NET (in C#, of course). He writes operating systems in C++ and assembler as a hobby.