106 lines
3.8 KiB
C
106 lines
3.8 KiB
C
// utf by pietro gagliardi (andlabs) — https://github.com/andlabs/utf/
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// 10 november 2016
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// note the overridden names with uipriv at the beginning; this avoids potential symbol clashes when building libui as a static library
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// LONGTERM find a way to encode the name overrides directly into the utf library
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#ifdef __cplusplus
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extern "C" {
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#endif
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// TODO (for utf itself as well) should this go outside the extern "C" block or not
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#include <stddef.h>
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#include <stdint.h>
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// if nElem == 0, assume the buffer has no upper limit and is '\0' terminated
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// otherwise, assume buffer is NOT '\0' terminated but is bounded by nElem *elements*
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extern size_t uiprivUTF8EncodeRune(uint32_t rune, char *encoded);
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extern const char *uiprivUTF8DecodeRune(const char *s, size_t nElem, uint32_t *rune);
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extern size_t uiprivUTF16EncodeRune(uint32_t rune, uint16_t *encoded);
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extern const uint16_t *uiprivUTF16DecodeRune(const uint16_t *s, size_t nElem, uint32_t *rune);
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extern size_t uiprivUTF8RuneCount(const char *s, size_t nElem);
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extern size_t uiprivUTF8UTF16Count(const char *s, size_t nElem);
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extern size_t uiprivUTF16RuneCount(const uint16_t *s, size_t nElem);
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extern size_t uiprivUTF16UTF8Count(const uint16_t *s, size_t nElem);
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#ifdef __cplusplus
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}
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// TODO sync this back to upstream (need copyright clearance first)
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// On Windows, wchar_t is equivalent to uint16_t, but C++ requires
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// wchar_t to be a completely distinct type. These overloads allow
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// passing wchar_t pointers directly into these functions from C++
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// on Windows. Otherwise, you'd need to cast to pass a wchar_t
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// pointer, WCHAR pointer, or equivalent to these functions.
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//
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// This does not apply to MSVC because the situation there is
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// slightly more complicated; see below.
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#if defined(_WIN32) && !defined(_MSC_VER)
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inline size_t uiprivUTF16EncodeRune(uint32_t rune, wchar_t *encoded)
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{
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return uiprivUTF16EncodeRune(rune, reinterpret_cast<uint16_t *>(encoded));
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}
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inline const wchar_t *uiprivUTF16DecodeRune(const wchar_t *s, size_t nElem, uint32_t *rune)
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{
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const uint16_t *ret;
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ret = uiprivUTF16DecodeRune(reinterpret_cast<const uint16_t *>(s), nElem, rune);
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return reinterpret_cast<const wchar_t *>(ret);
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}
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inline size_t uiprivUTF16RuneCount(const wchar_t *s, size_t nElem)
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{
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return uiprivUTF16RuneCount(reinterpret_cast<const uint16_t *>(s), nElem);
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}
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inline size_t uiprivUTF16UTF8Count(const wchar_t *s, size_t nElem)
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{
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return uiprivUTF16UTF8Count(reinterpret_cast<const uint16_t *>(s), nElem);
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}
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#endif
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// This is the same as the above, except that with MSVC, whether
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// wchar_t is a keyword or not is controlled by a compiler option!
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// (At least with gcc, this is not the case; thanks redi in
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// irc.freenode.net/#gcc.) We use __wchar_t to be independent of
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// the option; see https://blogs.msdn.microsoft.com/oldnewthing/20161201-00/?p=94836
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// (ironically posted one day after I initially wrote this code!).
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// TODO should defined(_WIN32) be used too?
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// TODO check this under /Wall
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// TODO are C-style casts enough? or will that fail in /Wall?
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// TODO same for UniChar/unichar on Mac? if both are unsigned then we have nothing to worry about
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#if defined(_MSC_VER)
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inline size_t uiprivUTF16EncodeRune(uint32_t rune, __wchar_t *encoded)
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{
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return uiprivUTF16EncodeRune(rune, reinterpret_cast<uint16_t *>(encoded));
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}
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inline const __wchar_t *uiprivUTF16DecodeRune(const __wchar_t *s, size_t nElem, uint32_t *rune)
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{
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const uint16_t *ret;
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ret = uiprivUTF16DecodeRune(reinterpret_cast<const uint16_t *>(s), nElem, rune);
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return reinterpret_cast<const __wchar_t *>(ret);
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}
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inline size_t uiprivUTF16RuneCount(const __wchar_t *s, size_t nElem)
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{
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return uiprivUTF16RuneCount(reinterpret_cast<const uint16_t *>(s), nElem);
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}
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inline size_t uiprivUTF16UTF8Count(const __wchar_t *s, size_t nElem)
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{
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return uiprivUTF16UTF8Count(reinterpret_cast<const uint16_t *>(s), nElem);
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}
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#endif
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#endif
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