5a0aa3dee2
Although glibc gets by with an 8-byte mbstate_t, OpenBSD uses 12 bytes (of the 128 bytes it reserves!). We can actually implement UTF-8 encoding/decoding with a 0-byte mbstate_t which means we can make things work on LP32 too, as long as we accept the limitation that the caller needs to present us with a complete sequence before we'll process it. Our behavior is fine when going from characters to bytes; we just update the source wchar_t** to say how far through the input we got. I'll come back and use the 4 bytes we do have to cope with byte sequences split across multiple input buffers. The fact that we don't support UTF-8 sequences longer than 4 bytes plus the fact that the first byte of a UTF-8 sequence encodes the length means we shouldn't need the other fields OpenBSD used (at the cost of some recomputation in cases where a sequence is split across buffers). This patch also makes the minimal changes necessary to setlocale(3) to make us behave like glibc when an app requests UTF-8. (The difference being that our "C" locale is the same as our "C.UTF-8" locale.) Change-Id: Ied327a8c4643744b3611bf6bb005a9b389ba4c2f
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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// TODO: these only work for the ASCII range; rewrite to dlsym icu4c?
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int iswalnum(wint_t wc) { return isalnum(wc); }
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int iswalpha(wint_t wc) { return isalpha(wc); }
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int iswblank(wint_t wc) { return isblank(wc); }
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int iswcntrl(wint_t wc) { return iscntrl(wc); }
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int iswdigit(wint_t wc) { return isdigit(wc); }
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int iswgraph(wint_t wc) { return isgraph(wc); }
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int iswlower(wint_t wc) { return islower(wc); }
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int iswprint(wint_t wc) { return isprint(wc); }
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int iswpunct(wint_t wc) { return ispunct(wc); }
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int iswspace(wint_t wc) { return isspace(wc); }
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int iswupper(wint_t wc) { return isupper(wc); }
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int iswxdigit(wint_t wc) { return isxdigit(wc); }
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int iswctype(wint_t wc, wctype_t char_class) {
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switch (char_class) {
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case WC_TYPE_ALNUM: return isalnum(wc);
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case WC_TYPE_ALPHA: return isalpha(wc);
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case WC_TYPE_BLANK: return isblank(wc);
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case WC_TYPE_CNTRL: return iscntrl(wc);
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case WC_TYPE_DIGIT: return isdigit(wc);
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case WC_TYPE_GRAPH: return isgraph(wc);
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case WC_TYPE_LOWER: return islower(wc);
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case WC_TYPE_PRINT: return isprint(wc);
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case WC_TYPE_PUNCT: return ispunct(wc);
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case WC_TYPE_SPACE: return isspace(wc);
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case WC_TYPE_UPPER: return isupper(wc);
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case WC_TYPE_XDIGIT: return isxdigit(wc);
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default: return 0;
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}
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}
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wint_t towlower(wint_t wc) { return tolower(wc); }
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wint_t towupper(wint_t wc) { return toupper(wc); }
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wctype_t wctype(const char* property) {
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static const char* const properties[WC_TYPE_MAX] = {
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"<invalid>",
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"alnum", "alpha", "blank", "cntrl", "digit", "graph",
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"lower", "print", "punct", "space", "upper", "xdigit"
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};
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for (size_t i = 0; i < WC_TYPE_MAX; ++i) {
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if (!strcmp(properties[i], property)) {
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return static_cast<wctype_t>(i);
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}
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}
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return static_cast<wctype_t>(0);
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}
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int wcwidth(wchar_t wc) {
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return (wc > 0);
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}
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// TODO: implement wcsftime.
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size_t wcsftime(wchar_t* wcs, size_t maxsize, const wchar_t* format, const struct tm* timptr) {
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abort();
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}
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