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/*
* Copyright (C) 2017 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.
*/
#include <inttypes.h>
#include <stdlib.h>
#include <wchar.h>
#include "UniquePtr.h"
namespace {
constexpr size_t MBS_FAILURE = static_cast<size_t>(-1);
}
template <typename T>
static T wcstox(T (*func)(const char*, char**, int), const wchar_t* wcs,
wchar_t** wcs_end, int base) {
mbstate_t mbstate;
memset(&mbstate, 0, sizeof(mbstate));
if (wcs_end != nullptr) {
*wcs_end = const_cast<wchar_t*>(wcs);
}
const size_t max_mb_len = wcslen(wcs) * 4 + 1;
UniquePtr<char[]> mbs(new char[max_mb_len]);
const wchar_t* s = wcs;
if (wcsrtombs(mbs.get(), &s, max_mb_len, &mbstate) == MBS_FAILURE) {
return static_cast<T>(0);
}
char* mbs_end;
T value = func(mbs.get(), &mbs_end, base);
if (wcs_end == nullptr) {
// If the user passed nullptr for the end pointer, we don't need to compute
// it and can return early.
return value;
}
// strto* can set ERANGE or EINVAL. Preserve the value of errno in case any of
// the things we're about to do to comput the end pointer don't clobber it.
int preserved_errno = errno;
// wcs_end needs to point to the character after the one converted. We don't
// know how many wide characters were converted, but we can figure that out by
// converting the multibyte string between mbs and mbs_end back to a wide
// character string.
size_t converted_len = mbs_end - mbs.get();
UniquePtr<char[]> converted_mbs(new char[converted_len + 1]);
strncpy(converted_mbs.get(), mbs.get(), converted_len);
converted_mbs[converted_len] = '\0';
const char* mbsp = converted_mbs.get();
size_t converted_wlen = mbsrtowcs(nullptr, &mbsp, 0, &mbstate);
if (converted_wlen == MBS_FAILURE) {
// This should be impossible.
abort();
}
*wcs_end = const_cast<wchar_t*>(wcs) + converted_wlen;
errno = preserved_errno;
return value;
}
static float strtof_wrapper(const char* s, char** p, int) {
return strtof(s, p);
}
float wcstof(const wchar_t* s, wchar_t** p) {
return wcstox(strtof_wrapper, s, p, 0);
}
static double strtod_wrapper(const char* s, char** p, int) {
return strtod(s, p);
}
double wcstod(const wchar_t *restrict s, wchar_t **restrict p) {
return wcstox(strtod_wrapper, s, p, 0);
}
long wcstol(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtol, s, p, base);
}
unsigned long wcstoul(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtoul, s, p, base);
}
long long wcstoll(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtoll, s, p, base);
}
unsigned long long wcstoull(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtoull, s, p, base);
}
intmax_t wcstoimax(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtoimax, s, p, base);
}
uintmax_t wcstoumax(const wchar_t *restrict s, wchar_t **restrict p, int base) {
return wcstox(strtoumax, s, p, base);
}
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