blob: f9b4037231fd85982c2c2dcd7d9209b4f8ff83d9 [file] [log] [blame]
// Copyright 2017 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/fx_system.h"
#include <math.h>
#include <limits>
#include "build/build_config.h"
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_extension.h"
namespace {
#if !BUILDFLAG(IS_WIN)
uint32_t g_last_error = 0;
#endif
template <typename IntType, typename CharType>
IntType FXSYS_StrToInt(const CharType* str) {
if (!str)
return 0;
// Process the sign.
bool neg = *str == '-';
if (neg || *str == '+') {
// SAFETY: `str` points at the start of the string, which is a character or
// a terminating NUL. `*str` is non-NUL from the condition above, so `str`
// is pointing inside the string. Afterward, `str` may be pointing at the
// terminating NUL.
UNSAFE_BUFFERS(str++);
}
IntType num = 0;
while (*str && FXSYS_IsDecimalDigit(*str)) {
IntType val = FXSYS_DecimalCharToInt(*str);
if (num > (std::numeric_limits<IntType>::max() - val) / 10) {
if (neg && std::numeric_limits<IntType>::is_signed) {
// Return MIN when the represented number is signed type and is smaller
// than the min value.
return std::numeric_limits<IntType>::min();
}
// Return MAX when the represented number is signed type and is larger
// than the max value, or the number is unsigned type and out of range.
return std::numeric_limits<IntType>::max();
}
num = num * 10 + val;
// SAFETY: The loop terminates if `str` is ever pointing at the terminating
// NUL. `str` is only moved by one character at a time, so inside the loop
// `str` always points inside the string.
UNSAFE_BUFFERS(str++);
}
// When it is a negative value, -num should be returned. Since num may be of
// unsigned type, use ~num + 1 to avoid the warning of applying unary minus
// operator to unsigned type.
return neg ? ~num + 1 : num;
}
template <typename T, typename UT, typename STR_T>
STR_T FXSYS_IntToStr(T value, STR_T str, int radix) {
if (radix < 2 || radix > 16) {
str[0] = 0;
return str;
}
if (value == 0) {
str[0] = '0';
UNSAFE_TODO(str[1]) = 0;
return str;
}
int i = 0;
UT uvalue;
if (value < 0) {
UNSAFE_TODO(str[i++]) = '-';
// Standard trick to avoid undefined behaviour when negating INT_MIN.
uvalue = static_cast<UT>(-(value + 1)) + 1;
} else {
uvalue = value;
}
int digits = 1;
T order = uvalue / radix;
while (order > 0) {
digits++;
order = order / radix;
}
for (int d = digits - 1; d > -1; d--) {
UNSAFE_TODO(str[d + i] = "0123456789abcdef"[uvalue % radix]);
uvalue /= radix;
}
UNSAFE_TODO(str[digits + i]) = 0;
return str;
}
} // namespace
int FXSYS_roundf(float f) {
if (isnan(f))
return 0;
if (f < static_cast<float>(std::numeric_limits<int>::min()))
return std::numeric_limits<int>::min();
if (f >= static_cast<float>(std::numeric_limits<int>::max()))
return std::numeric_limits<int>::max();
return static_cast<int>(round(f));
}
int FXSYS_round(double d) {
if (isnan(d))
return 0;
if (d < static_cast<double>(std::numeric_limits<int>::min()))
return std::numeric_limits<int>::min();
if (d >= static_cast<double>(std::numeric_limits<int>::max()))
return std::numeric_limits<int>::max();
return static_cast<int>(round(d));
}
int32_t FXSYS_atoi(const char* str) {
return FXSYS_StrToInt<int32_t, char>(str);
}
uint32_t FXSYS_atoui(const char* str) {
return FXSYS_StrToInt<uint32_t>(str);
}
int32_t FXSYS_wtoi(const wchar_t* str) {
return FXSYS_StrToInt<int32_t, wchar_t>(str);
}
int64_t FXSYS_atoi64(const char* str) {
return FXSYS_StrToInt<int64_t, char>(str);
}
const char* FXSYS_i64toa(int64_t value, char* str, int radix) {
return FXSYS_IntToStr<int64_t, uint64_t, char*>(value, str, radix);
}
#if BUILDFLAG(IS_WIN)
size_t FXSYS_wcsftime(wchar_t* strDest,
size_t maxsize,
const wchar_t* format,
const struct tm* timeptr) {
// Avoid tripping an invalid parameter handler and crashing process.
// Note: leap seconds may cause tm_sec == 60.
if (timeptr->tm_year < -1900 || timeptr->tm_year > 8099 ||
timeptr->tm_mon < 0 || timeptr->tm_mon > 11 || timeptr->tm_mday < 1 ||
timeptr->tm_mday > 31 || timeptr->tm_hour < 0 || timeptr->tm_hour > 23 ||
timeptr->tm_min < 0 || timeptr->tm_min > 59 || timeptr->tm_sec < 0 ||
timeptr->tm_sec > 60 || timeptr->tm_wday < 0 || timeptr->tm_wday > 6 ||
timeptr->tm_yday < 0 || timeptr->tm_yday > 365) {
strDest[0] = L'\0';
return 0;
}
return wcsftime(strDest, maxsize, format, timeptr);
}
int FXSYS_stricmp(const char* str1, const char* str2) {
return _stricmp(str1, str2);
}
int FXSYS_wcsicmp(const wchar_t* str1, const wchar_t* str2) {
return _wcsicmp(str1, str2);
}
#else // BUILDFLAG(IS_WIN)
char* FXSYS_strlwr(char* str) {
if (!str) {
return nullptr;
}
char* s = str;
while (*str) {
*str = tolower(*str);
UNSAFE_BUFFERS(str++); // SAFETY: NUL check in while condition.
}
return s;
}
char* FXSYS_strupr(char* str) {
if (!str) {
return nullptr;
}
char* s = str;
while (*str) {
*str = toupper(*str);
UNSAFE_BUFFERS(str++); // SAFETY: NUL check in while condition.
}
return s;
}
wchar_t* FXSYS_wcslwr(wchar_t* str) {
if (!str) {
return nullptr;
}
wchar_t* s = str;
while (*str) {
*str = FXSYS_towlower(*str);
UNSAFE_BUFFERS(str++); // SAFETY: NUL check in while condition.
}
return s;
}
wchar_t* FXSYS_wcsupr(wchar_t* str) {
if (!str) {
return nullptr;
}
wchar_t* s = str;
while (*str) {
*str = FXSYS_towupper(*str);
UNSAFE_BUFFERS(str++); // SAFETY: NUL check in while condition.
}
return s;
}
int FXSYS_stricmp(const char* str1, const char* str2) {
int f;
int l;
do {
f = toupper(*str1);
l = toupper(*str2);
// SAFETY: The loop breaks when `*str1` is NUL, so `str1` is always inside
// its string.
UNSAFE_BUFFERS(++str1);
// SAFETY: The loop breaks when `*str1` is non-NUL but `*str2` is NUL (as
// checked by `f != l`), so `str2` is always inside its string.
UNSAFE_BUFFERS(++str2);
} while (f && f == l);
return f - l;
}
int FXSYS_wcsicmp(const wchar_t* str1, const wchar_t* str2) {
wchar_t f;
wchar_t l;
do {
f = FXSYS_towupper(*str1);
l = FXSYS_towupper(*str2);
// SAFETY: The loop breaks when `*str1` is NUL, so `str1` is always inside
// its string.
UNSAFE_BUFFERS(++str1);
// SAFETY: The loop breaks when `*str1` is non-NUL but `*str2` is NUL (as
// checked by `f != l`), so `str2` is always inside its string.
UNSAFE_BUFFERS(++str2);
} while (f && f == l);
return f - l;
}
char* FXSYS_itoa(int value, char* str, int radix) {
return FXSYS_IntToStr<int32_t, uint32_t, char*>(value, str, radix);
}
void FXSYS_SetLastError(uint32_t err) {
g_last_error = err;
}
uint32_t FXSYS_GetLastError() {
return g_last_error;
}
#endif // BUILDFLAG(IS_WIN)
float FXSYS_sqrt2(float a, float b) {
return sqrtf(a * a + b * b);
}