base: Clean up redundant string functions and use C++11

This patch does a bit of housekeeping on the string helper functions
and relies on the C++11 standard library where possible. It also does
away with our custom string hash as an implementation is already part
of the standard library.
This commit is contained in:
Andreas Hansson
2014-09-20 17:17:49 -04:00
parent b2c2e67468
commit 0fa128bbd0
7 changed files with 97 additions and 327 deletions

View File

@@ -28,14 +28,9 @@
* Authors: Nathan Binkert
*/
#include <cctype>
#include <cstring>
#include <iostream>
#include <limits>
#include <string>
#include <vector>
#include "base/intmath.hh"
#include "base/str.hh"
using namespace std;
@@ -106,270 +101,3 @@ tokenize(vector<string>& v, const string &s, char token, bool ignore)
v.push_back(s.substr(first));
}
/**
* @todo This function will not handle the smallest negative decimal
* value for a signed type
*/
template <class T>
inline bool
__to_number(string value, T &retval)
{
static const T maxnum = ((T)-1);
static const bool sign = numeric_limits<T>::is_signed;
static const int bits = numeric_limits<T>::digits;
static const T hexmax = maxnum & (((T)1 << (bits - 4)) - 1);
static const T octmax = maxnum & (((T)1 << (bits - 3)) - 1);
static const T signmax = numeric_limits<T>::max();
static const T decmax = signmax / 10;
#if 0
cout << "maxnum = 0x" << hex << (unsigned long long)maxnum << "\n"
<< "sign = 0x" << hex << (unsigned long long)sign << "\n"
<< "hexmax = 0x" << hex << (unsigned long long)hexmax << "\n"
<< "octmax = 0x" << hex << (unsigned long long)octmax << "\n"
<< "signmax = 0x" << hex << (unsigned long long)signmax << "\n"
<< "decmax = 0x" << hex << (unsigned long long)decmax << "\n";
#endif
eat_white(value);
bool negative = false;
bool hex = false;
bool oct = false;
int last = value.size() - 1;
retval = 0;
int i = 0;
char c = value[i];
if (!isDec(c)) {
if (c == '-' && sign)
negative = true;
else
return false;
}
else {
retval += c - '0';
if (last == 0) return true;
}
if (c == '0')
oct = true;
c = value[++i];
if (oct) {
if (sign && negative)
return false;
if (!isOct(c)) {
if (c == 'X' || c == 'x') {
hex = true;
oct = false;
} else
return false;
}
else
retval += c - '0';
} else if (!isDec(c))
goto multiply;
else {
if (sign && negative && c == '0')
return false;
retval *= 10;
retval += c - '0';
if (last == 1) {
if (sign && negative) retval = -retval;
return true;
}
}
if (hex) {
if (last == 1)
return false;
for (i = 2; i <= last ; i++) {
c = value[i];
if (!isHex(c))
return false;
if (retval > hexmax) return false;
retval *= 16;
retval += hex2Int(c);
}
return true;
} else if (oct) {
for (i = 2; i <= last ; i++) {
c = value[i];
if (!isOct(c))
return false;
if (retval > octmax) return false;
retval *= 8;
retval += (c - '0');
}
return true;
}
for (i = 2; i < last ; i++) {
c = value[i];
if (!isDec(c))
goto multiply;
if (retval > decmax) return false;
bool atmax = retval == decmax;
retval *= 10;
retval += c - '0';
if (atmax && retval < decmax) return false;
if (sign && (retval & ((T)1 << (sizeof(T) * 8 - 1))))
return false;
}
c = value[last];
if (isDec(c)) {
if (retval > decmax) return false;
bool atmax = retval == decmax;
retval *= 10;
retval += c - '0';
if (atmax && retval < decmax) return false;
if (sign && negative) {
if ((retval & ((T)1 << (sizeof(T) * 8 - 1))) &&
retval >= (T)-signmax)
return false;
retval = -retval;
}
else
if (sign && (retval & ((T)1 << ((sizeof(T) * 8) - 1))))
return false;
return true;
}
multiply:
signed long long mult = 1;
T val;
switch (c) {
case 'k':
case 'K':
if (i != last) return false;
mult = 1024;
val = signmax / mult;
break;
case 'm':
case 'M':
if (i != last) return false;
mult = 1024 * 1024;
val = signmax / mult;
break;
case 'g':
case 'G':
if (i != last) return false;
mult = 1024 * 1024 * 1024;
val = signmax / mult;
break;
case 'e':
case 'E':
if (i >= last) return false;
mult = 0;
for (i++; i <= last; i++) {
c = value[i];
if (!isDec(c))
return false;
mult *= 10;
mult += c - '0';
}
for (i = 0; i < mult; i++) {
if (retval > signmax / 10)
return false;
retval *= 10;
if (sign && (retval & ((T)1 << (sizeof(T) * 8 - 1))))
return false;
}
if (sign && negative) {
if ((retval & ((T)1 << (sizeof(T) * 8 - 1))) &&
retval >= (T)-signmax)
return false;
retval = -retval;
}
else
if (sign && (retval & ((T)1 << ((sizeof(T) * 8) - 1))))
return false;
return true;
default:
return false;
}
if (sign && negative)
return false;
if (mult > (unsigned long long)signmax)
return false;
if (retval > val)
return false;
retval *= mult;
return true;
}
#define STN(type) \
template<> \
bool to_number<type>(const string &value, type &retval) \
{ return __to_number(value, retval); }
STN(unsigned long long)
STN(signed long long)
STN(unsigned long)
STN(signed long)
STN(unsigned int)
STN(signed int)
STN(unsigned short)
STN(signed short)
STN(unsigned char)
STN(signed char)
STN(char)
template<>
bool to_number<bool>(const string &value, bool &retval)
{
string lowered = to_lower(value);
if (value == "0") {
retval = false;
return true;
}
if (value == "1"){
retval = true;
return true;
}
if (lowered == "false") {
retval = false;
return true;
}
if (lowered == "true"){
retval = true;
return true;
}
if (lowered == "no") {
retval = false;
return true;
}
if (lowered == "yes"){
retval = true;
return true;
}
return false;
}