32bc0fcf69
Fixes -Wzero-as-null-pointer-constant warning. Test: m Bug: 68236239 Change-Id: I5b4123bc6709641315120a191e36cc57541349b2
106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#define __BIONIC_LP32_USE_LONG_DOUBLE
|
|
|
|
#include <wchar.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "local.h"
|
|
|
|
/// Performs wide-character string to floating point conversion.
|
|
template <typename float_type>
|
|
float_type wcstod(const wchar_t* str, wchar_t** end, float_type strtod_fn(const char*, char**)) {
|
|
const wchar_t* original_str = str;
|
|
while (iswspace(*str)) {
|
|
str++;
|
|
}
|
|
|
|
// What's the longest span of the input that might be part of the float?
|
|
size_t max_len = wcsspn(str, L"-+0123456789.xXeEpP()nNaAiIfFtTyY");
|
|
|
|
// We know the only valid characters are ASCII, so convert them by brute force.
|
|
char* ascii_str = new char[max_len + 1];
|
|
if (!ascii_str) return float_type();
|
|
for (size_t i = 0; i < max_len; ++i) {
|
|
ascii_str[i] = str[i] & 0xff;
|
|
}
|
|
ascii_str[max_len] = 0;
|
|
|
|
// Set up a fake FILE that points to those ASCII characters, for `parsefloat`.
|
|
FILE f;
|
|
__sfileext fext;
|
|
_FILEEXT_SETUP(&f, &fext);
|
|
f._flags = __SRD;
|
|
f._bf._base = f._p = reinterpret_cast<unsigned char*>(ascii_str);
|
|
f._bf._size = f._r = max_len;
|
|
f._read = [](void*, char*, int) { return 0; }; // aka `eofread`, aka "no more data".
|
|
f._lb._base = nullptr;
|
|
|
|
// Ask `parsefloat` to look at the same data more carefully.
|
|
|
|
// We can't just do this straight away because we can't construct a suitable FILE*
|
|
// in the absence of any `fwmemopen` analogous to `fmemopen`. And we don't want to
|
|
// duplicate the `parsefloat` logic. We also don't want to actually have to have wchar_t
|
|
// implementations of the ASCII `strtod` logic (though if you were designing a libc
|
|
// from scratch, you'd probably want to just make that more generic and lose all the
|
|
// cruft on top).
|
|
size_t actual_len = parsefloat(&f, ascii_str, ascii_str + max_len);
|
|
|
|
// Finally let the ASCII conversion function do the work.
|
|
char* ascii_end;
|
|
float_type result = strtod_fn(ascii_str, &ascii_end);
|
|
if (ascii_end != ascii_str + actual_len) abort();
|
|
|
|
if (end) {
|
|
if (actual_len == 0) {
|
|
// There was an error. We need to set the end pointer back to the original string, not the
|
|
// one we advanced past the leading whitespace.
|
|
*end = const_cast<wchar_t*>(original_str);
|
|
} else {
|
|
*end = const_cast<wchar_t*>(str) + actual_len;
|
|
}
|
|
}
|
|
|
|
delete[] ascii_str;
|
|
return result;
|
|
}
|
|
|
|
float wcstof(const wchar_t* s, wchar_t** end) {
|
|
return wcstod<float>(s, end, strtof);
|
|
}
|
|
|
|
double wcstod(const wchar_t* s, wchar_t** end) {
|
|
return wcstod<double>(s, end, strtod);
|
|
}
|
|
|
|
long double wcstold(const wchar_t* s, wchar_t** end) {
|
|
return wcstod<long double>(s, end, strtold);
|
|
}
|