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// **********************************************************************
//
// Copyright (c) 2003
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
#include <IceUtil/InputUtil.h>
#include <stdlib.h>
#include <errno.h>
using namespace std;
static const string allDigits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//
// Table to convert ASCII digits/letters into their value (100 for unused slots)
//
static const char digitVal[] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, // '0' - '9'
100, 100, 100, 100, 100, 100, 100, // punctuation
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, // 'A' - 'J'
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, // 'K' - 'T'
30, 31, 32, 33, 34, 35 // 'U' - 'Z'
};
namespace IceUtil
{
//
// strToInt64 emulates strtoll() for Windows
//
Int64
strToInt64(const char* s, char** endptr, int base)
{
#if defined(_WIN32)
//
// Assume nothing will be there to convert for now
//
if(endptr)
{
*endptr = const_cast<char *>(s);
}
//
// Skip leading whitespace
//
while(*s && isspace(*s))
{
++s;
}
//
// Check for sign
//
int sign = 1;
if(*s == '+')
{
++s;
}
else if(*s == '-')
{
sign = -1;
++s;
}
//
// Check that base is valid
//
if(base == 0)
{
if(*s == '0')
{
base = 8;
if(*++s == 'x' || *s == 'X')
{
base = 16;
++s;
}
}
else
{
base = 10;
}
}
else if(base < 2 || base > 36)
{
errno = EINVAL;
return 0;
}
//
// Check that we have something left to parse
//
if(*s == '/0')
{
return 0;
}
Int64 result = 0;
bool overflow = false;
const string validDigits(allDigits.begin(), allDigits.begin() + base);
while(*s && validDigits.find_first_of(toupper(*s)) != validDigits.npos)
{
if(!overflow)
{
int digit = digitVal[toupper(*s) - '0'];
assert(digit != 100);
if(result < Int64Max / base)
{
result *= base;
result += digit;
}
else if((digit <= Int64Max % base) || (sign == -1 && digit == Int64Max % base + 1))
{
result *= base;
result += digit;
}
else
{
overflow = true;
result = sign == -1 ? Int64Min : Int64Max;
}
}
++s;
}
if(overflow)
{
errno = ERANGE;
}
else
{
result *= sign;
}
if(endptr)
{
*endptr = const_cast<char *>(s);
}
return result;
#else
return strtoll(s, endptr, base);
#endif
}
bool
stringToInt64(const string& stringToParse, Int64& result, string::size_type& pos)
{
string::const_iterator i = stringToParse.begin();
while(i != stringToParse.end() && isspace(*i))
{
++i;
}
if(i == stringToParse.end()) // String empty or nothing but whitespace
{
result = 0;
pos = string::npos;
return false;
}
string::const_reverse_iterator j = stringToParse.rbegin();
while(isspace(*j))
{
++j;
} // j now points at last non-whitespace char
string nonWhite(i, j.base()); // nonWhite has trailing whitespace stripped
errno = 0;
const char* startp = nonWhite.c_str();
char* endp;
result = strToInt64(startp, &endp, 0);
pos = *endp == '\0' ? string::npos : (i - stringToParse.begin()) + (endp - startp);
return startp != endp && errno != ERANGE && errno != EINVAL;
}
}
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