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LibC: Implement wcsftime using a makeshift solution

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Tim Schumacher 2022-06-22 16:07:50 +02:00 • committed by Linus Groh
parent a79796ea4a
commit ffb95bace4
1 changed files with 35 additions and 7 deletions
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42
Userland/Libraries/LibC/wchar.cpp
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@ -1,14 +1,17 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Tim Schumacher <timschumi@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/Format.h>
#include <AK/ScopeGuard.h>
#include <AK/UnicodeUtils.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <wchar.h>
static unsigned int mbstate_expected_bytes(mbstate_t* state)
@ -687,13 +690,38 @@ size_t wcsspn(wchar_t const* wcs, wchar_t const* accept)
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcsftime.html
size_t wcsftime(wchar_t* __restrict wcs, size_t maxsize, wchar_t const* __restrict format, const struct tm* __restrict timeptr)
size_t wcsftime(wchar_t* destination, size_t maxsize, wchar_t const* format, const struct tm* tm)
{
(void)wcs;
(void)maxsize;
(void)format;
(void)timeptr;
dbgln("FIXME: Implement wcsftime()");
TODO();
// FIXME: Add actual wide char support for this.
char* ascii_format = static_cast<char*>(malloc(wcslen(format) + 1));
char* ascii_destination = static_cast<char*>(malloc(maxsize));
VERIFY(ascii_format && ascii_destination);
// These are copied by value because we will change the pointers without rolling them back.
ScopeGuard free_ascii = [ascii_format, ascii_destination] {
free(ascii_format);
free(ascii_destination);
};
char* ascii_format_copy = ascii_format;
do {
VERIFY(*format <= 0x7f);
*ascii_format_copy++ = static_cast<char>(*format);
} while (*format++ != L'\0');
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
size_t ret = strftime(ascii_destination, maxsize, ascii_format, tm);
#pragma GCC diagnostic pop
if (ret == 0)
return 0;
do {
*destination++ = *ascii_destination;
} while (*ascii_destination++ != '\0');
return ret;
}
}