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// Common/StringToInt.cpp
#include "StdAfx.h"
#include <limits.h>
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
#include <stdint.h> // for WCHAR_MAX in vs2022
#endif
#include "StringToInt.h"
static const UInt32 k_UInt32_max = 0xFFFFFFFF;
static const UInt64 k_UInt64_max = UINT64_CONST(0xFFFFFFFFFFFFFFFF);
// static const UInt64 k_UInt64_max = (UInt64)(Int64)-1;
#define DIGIT_TO_VALUE(charTypeUnsigned, digit) ((unsigned)(charTypeUnsigned)digit - '0')
// #define DIGIT_TO_VALUE(charTypeUnsigned, digit) ((unsigned)digit - '0')
// #define DIGIT_TO_VALUE(charTypeUnsigned, digit) ((unsigned)(digit - '0'))
#define CONVERT_STRING_TO_UINT_FUNC(uintType, charType, charTypeUnsigned) \
uintType ConvertStringTo ## uintType(const charType *s, const charType **end) throw() { \
if (end) *end = s; \
uintType res = 0; \
for (;; s++) { \
const unsigned v = DIGIT_TO_VALUE(charTypeUnsigned, *s); \
if (v > 9) { if (end) *end = s; return res; } \
if (res > (k_ ## uintType ## _max) / 10) return 0; \
res *= 10; \
if (res > (k_ ## uintType ## _max) - v) return 0; \
res += v; }}
// arm-linux-gnueabi GCC compilers give (WCHAR_MAX > UINT_MAX) by some unknown reason
// so we don't use this branch
#if 0 && WCHAR_MAX > UINT_MAX
/*
if (sizeof(wchar_t) > sizeof(unsigned)
we must use CONVERT_STRING_TO_UINT_FUNC_SLOW
But we just stop compiling instead.
We need some real cases to test this code.
*/
#error Stop_Compiling_WCHAR_MAX_IS_LARGER_THAN_UINT_MAX
#define CONVERT_STRING_TO_UINT_FUNC_SLOW(uintType, charType, charTypeUnsigned) \
uintType ConvertStringTo ## uintType(const charType *s, const charType **end) throw() { \
if (end) *end = s; \
uintType res = 0; \
for (;; s++) { \
const charTypeUnsigned c = (charTypeUnsigned)*s; \
if (c < '0' || c > '9') { if (end) *end = s; return res; } \
if (res > (k_ ## uintType ## _max) / 10) return 0; \
res *= 10; \
const unsigned v = (unsigned)(c - '0'); \
if (res > (k_ ## uintType ## _max) - v) return 0; \
res += v; }}
#endif
CONVERT_STRING_TO_UINT_FUNC(UInt32, char, Byte)
CONVERT_STRING_TO_UINT_FUNC(UInt32, wchar_t, wchar_t)
CONVERT_STRING_TO_UINT_FUNC(UInt64, char, Byte)
CONVERT_STRING_TO_UINT_FUNC(UInt64, wchar_t, wchar_t)
Int32 ConvertStringToInt32(const wchar_t *s, const wchar_t **end) throw()
{
if (end)
*end = s;
const wchar_t *s2 = s;
if (*s == '-')
s2++;
const wchar_t *end2;
UInt32 res = ConvertStringToUInt32(s2, &end2);
if (s2 == end2)
return 0;
if (s != s2)
{
if (res > (UInt32)1 << (32 - 1))
return 0;
res = 0 - res;
}
else
{
if (res & (UInt32)1 << (32 - 1))
return 0;
}
if (end)
*end = end2;
return (Int32)res;
}
#define CONVERT_OCT_STRING_TO_UINT_FUNC(uintType) \
uintType ConvertOctStringTo ## uintType(const char *s, const char **end) throw() \
{ \
if (end) *end = s; \
uintType res = 0; \
for (;; s++) { \
const unsigned c = (unsigned)(Byte)*s - '0'; \
if (c > 7) { \
if (end) \
*end = s; \
return res; \
} \
if (res & (uintType)7 << (sizeof(uintType) * 8 - 3)) \
return 0; \
res <<= 3; \
res |= c; \
} \
}
CONVERT_OCT_STRING_TO_UINT_FUNC(UInt32)
CONVERT_OCT_STRING_TO_UINT_FUNC(UInt64)
#define CONVERT_HEX_STRING_TO_UINT_FUNC(uintType) \
uintType ConvertHexStringTo ## uintType(const char *s, const char **end) throw() \
{ \
if (end) *end = s; \
uintType res = 0; \
for (;; s++) { \
unsigned c = (unsigned)(Byte)*s; \
Z7_PARSE_HEX_DIGIT(c, { if (end) *end = s; return res; }) \
if (res & (uintType)0xF << (sizeof(uintType) * 8 - 4)) \
return 0; \
res <<= 4; \
res |= c; \
} \
}
CONVERT_HEX_STRING_TO_UINT_FUNC(UInt32)
CONVERT_HEX_STRING_TO_UINT_FUNC(UInt64)
const char *FindNonHexChar(const char *s) throw()
{
for (;;)
{
unsigned c = (Byte)*s++; // pointer can go 1 byte after end
c -= '0';
if (c <= 9)
continue;
c -= 'A' - '0';
c &= ~0x20u;
if (c > 5)
return s - 1;
}
}
Byte *ParseHexString(const char *s, Byte *dest) throw()
{
for (;;)
{
unsigned v0 = (Byte)s[0]; Z7_PARSE_HEX_DIGIT(v0, return dest;)
unsigned v1 = (Byte)s[1]; s += 2; Z7_PARSE_HEX_DIGIT(v1, return dest;)
*dest++ = (Byte)(v1 | (v0 << 4));
}
}
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