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Diffstat (limited to 'include/iprt/nocrt/string')
| -rw-r--r-- | include/iprt/nocrt/string | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/include/iprt/nocrt/string b/include/iprt/nocrt/string new file mode 100644 index 00000000..31897dd1 --- /dev/null +++ b/include/iprt/nocrt/string @@ -0,0 +1,322 @@ +/** @file + * IPRT / No-CRT - Minimal C++ string header. + */ + +/* + * Copyright (C) 2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef VBOX_INCLUDED_SRC_nocrt_string +#define VBOX_INCLUDED_SRC_nocrt_string +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/nocrt/string.h> +#include <iprt/nocrt/cstddef> /* for std::size_t */ +#include <iprt/cpp/ministring.h> + +#ifndef RT_NOCRT_EOF /* also in stdio.h */ +# define RT_NOCRT_EOF (-1) +#endif + +namespace std +{ + using streamoff = ::RTFOFF; + + /** + * @note This should be in iosfwd, not string. + */ + template<typename a_MbStateType> + class fpos + { + protected: + std::streamoff m_off; + a_MbStateType m_MbState; + + public: + fpos() + : m_off(0) + , m_MbState() + { } + + fpos(std::streamoff a_off) + : m_off(a_off) + , m_MbState() + { } + + a_MbStateType state() const RT_NOEXCEPT + { + return m_MbState; + } + + void state(a_MbStateType a_NewMbState) const RT_NOEXCEPT + { + m_MbState = a_NewMbState; + } + }; + using mbstate_t = ::RT_NOCRT(mbstate_t); + using streampos = fpos<std::mbstate_t>; + + /* Use RTCString as std::string, it should be a reasonable match. */ + typedef ::RTCString string; + + /** + * Character traits. + */ + template<typename a_CharType> + struct char_traits + { + /** @name Types + * @{ */ + typedef a_CharType char_type; + typedef unsigned long int_type; + typedef std::streamoff off_type; + typedef std::streampos pos_type; + typedef std::mbstate_t state_type; + /** @} */ + + static void assign(char_type &a_rchDst, const char_type &a_rchSrc) RT_NOEXCEPT + { + a_rchDst = a_rchSrc; + } + + static bool eq(const char_type &a_rchLeft, const char_type &a_rchRight) RT_NOEXCEPT + { + return a_rchLeft == a_rchRight; + } + + static bool lt(const char_type &a_rchLeft, const char_type &a_rchRight) RT_NOEXCEPT + { + return a_rchLeft < a_rchRight; + } + + static std::size_t length(const char_type *a_psz) RT_NOEXCEPT; + static int compare(const char_type *a_pchLeft, const char_type *a_pchRight, std::size_t a_cch) RT_NOEXCEPT; + static const char_type *find(const char_type *a_pchHaystack, std::size_t a_cchHaystack, const char_type &a_rchNeedle) RT_NOEXCEPT; + static char_type *assign(char_type *a_pchDst, std::size_t a_cchDst, char_type a_chFill) RT_NOEXCEPT; + static char_type *copy(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT; + static char_type *move(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT; + + static char_type to_char_type(const int_type &a_riChar) + { + return static_cast<char_type>(a_riChar); + } + + static int_type to_int_type(const char_type &a_rch) + { + return static_cast<int_type>(a_rch); + } + + static bool eq_int_type(const int_type &a_riLeft, const int_type &a_riRight) RT_NOEXCEPT + { + return a_riLeft == a_riRight; + } + + static int_type eof() RT_NOEXCEPT + { + return static_cast<int_type>(RT_NOCRT_EOF); + } + + static int_type not_eof(const int_type &a_riChar) RT_NOEXCEPT + { + if (!eq_int_type(a_riChar, eof())) + return a_riChar; + return to_int_type(char_type()); + } + }; + + template<typename a_CharType> + /*static*/ std::size_t char_traits<a_CharType>::length(const char_type *a_psz) RT_NOEXCEPT + { + const char_type * const pszStart = a_psz; + while (!eq(*a_pszLeft, char_type())) + a_psz++; + return static_cast<std::size_t>(a_psz - pszStart); + } + + template<typename a_CharType> + /*static*/ int char_traits<a_CharType>::compare(const char_type *a_pchLeft, const char_type *a_pchRight, + std::size_t a_cch) RT_NOEXCEPT + { + for (std::size_t off = 0; off < a_cch; off++) + if (eq(a_pchLeft[off], a_pchRight[off])) + { /* likely? */ } + else + return lt(a_pchLeft[off], a_pchRight[off]) ? -1 : 1; + return 0; + } + + template<typename a_CharType> + /*static*/ const typename char_traits<a_CharType>::char_type * + char_traits<a_CharType>::find(const char_type *a_pchHaystack, std::size_t a_cchHaystack, + const char_type &a_rchNeedle) RT_NOEXCEPT + { + while (a_cchHaystack-- > 0) + { + if (eq(*a_pchHaystack, a_rchNeedle)) + return a_pchHaystack; + a_pchHaystack++; + } + return NULL; + } + + template<typename a_CharType> + /*static*/ typename char_traits<a_CharType>::char_type * + char_traits<a_CharType>::assign(char_type *a_pchDst, std::size_t a_cchDst, char_type a_chFill) RT_NOEXCEPT + { + char_type * const pchRet = a_pchDst; + while (a_cchDst-- > 0) + *a_pchDst++ = a_chFill; + return pchRet; + } + + template<typename a_CharType> + /*static*/ typename char_traits<a_CharType>::char_type * + char_traits<a_CharType>::copy(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT + { + char_type * const pchRet = a_pchDst; + while (a_cch-- > 0) + *a_pchDst++ = *a_pchSrc++; + return pchRet; + } + + template<typename a_CharType> + /*static*/ typename char_traits<a_CharType>::char_type * + char_traits<a_CharType>::move(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT + { + char_type * const pchRet = a_pchDst; + char_type volatile *pchDstV = static_cast<char_type const volatile *>(a_pchDst); + char_type const volatile *pchSrcV = static_cast<char_type const volatile *>(a_pchSrc); + if ((uintptr_t)a_pchDst < (uintptr_t)a_pchSrc) + { + /* forward copy */ + while (a_cch-- > 0) + *a_pchDstV++ = *a_pchSrcV++; + } + else + { + /* reverse copy */ + a_pchSrcV += a_cch; + a_pchDstV += a_cch; + while (a_cchDst-- > 0) + *a_pchDstV-- = *a_pchSrcV--; + } + return pchRet; + } + + /* + * Character train specializations. + */ + template <> + struct char_traits<char> + { + typedef char char_type; + typedef int int_type; + typedef std::streamoff off_type; + typedef std::streampos pos_type; + typedef std::mbstate_t state_type; + + static void assign(char_type &a_rchDst, const char_type &a_rchSrc) RT_NOEXCEPT + { + a_rchDst = a_rchSrc; + } + + static bool eq(const char_type &a_rchLeft, const char_type &a_rchRight) RT_NOEXCEPT + { + return a_rchLeft == a_rchRight; + } + + static bool lt(const char_type &a_rchLeft, const char_type &a_rchRight) RT_NOEXCEPT + { + return a_rchLeft < a_rchRight; + } + + static std::size_t length(const char_type *a_psz) RT_NOEXCEPT + { + return ::RT_NOCRT(strlen)(a_psz); + } + + static int compare(const char_type *a_pchLeft, const char_type *a_pchRight, std::size_t a_cch) RT_NOEXCEPT + { + return ::RT_NOCRT(memcmp)(a_pchLeft, a_pchRight, a_cch); + } + + static const char_type *find(const char_type *a_pchHaystack, std::size_t a_cchHaystack, const char_type &a_rchNeedle) RT_NOEXCEPT + { + return static_cast<const char_type *>(::RT_NOCRT(memchr)(a_pchHaystack, a_rchNeedle, a_cchHaystack)); + } + + static char_type *assign(char_type *a_pchDst, std::size_t a_cchDst, char_type a_chFill) RT_NOEXCEPT + { + return static_cast<char_type *>(::RT_NOCRT(memset)(a_pchDst, a_chFill, a_cchDst)); + } + + static char_type *copy(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT + { + return static_cast<char_type *>(::RT_NOCRT(memcpy)(a_pchDst, a_pchSrc, a_cch)); + } + + static char_type *move(char_type *a_pchDst, const char_type *a_pchSrc, std::size_t a_cch) RT_NOEXCEPT + { + return static_cast<char_type *>(::RT_NOCRT(memmove)(a_pchDst, a_pchSrc, a_cch)); + } + + static char_type to_char_type(const int_type &a_riChar) + { + return static_cast<char_type>(a_riChar); + } + + static int_type to_int_type(const char_type &a_rch) + { + return static_cast<int_type>(a_rch); + } + + static bool eq_int_type(const int_type &a_riLeft, const int_type &a_riRight) RT_NOEXCEPT + { + return a_riLeft == a_riRight; + } + + static int_type eof() RT_NOEXCEPT + { + return static_cast<int_type>(RT_NOCRT_EOF); + } + + static int_type not_eof(const int_type &a_riChar) RT_NOEXCEPT + { + if (!eq_int_type(a_riChar, eof())) + return a_riChar; + return 0; + } + }; +} + + +#endif /* !VBOX_INCLUDED_SRC_nocrt_string */ |