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Diffstat (limited to 'REORG.TODO/locale/weightwc.h')
| -rw-r--r-- | REORG.TODO/locale/weightwc.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/REORG.TODO/locale/weightwc.h b/REORG.TODO/locale/weightwc.h new file mode 100644 index 0000000000..97ce2b3dec --- /dev/null +++ b/REORG.TODO/locale/weightwc.h @@ -0,0 +1,128 @@ +/* Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written by Ulrich Drepper, <drepper@cygnus.com>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _WEIGHTWC_H_ +#define _WEIGHTWC_H_ 1 + +#include <libc-diag.h> + +/* Find index of weight. */ +static inline int32_t __attribute__ ((always_inline)) +findidx (const int32_t *table, + const int32_t *indirect, + const wint_t *extra, + const wint_t **cpp, size_t len) +{ + wint_t ch = *(*cpp)++; + int32_t i = __collidx_table_lookup ((const char *) table, ch); + + if (i >= 0) + /* This is an index into the weight table. Cool. */ + return i; + + /* Oh well, more than one sequence starting with this byte. + Search for the correct one. */ + const int32_t *cp = (const int32_t *) &extra[-i]; + --len; + while (1) + { + size_t nhere; + const int32_t *usrc = (const int32_t *) *cpp; + + /* The first thing is the index. */ + i = *cp++; + + /* Next is the length of the byte sequence. These are always + short byte sequences so there is no reason to call any + function (even if they are inlined). */ + nhere = *cp++; + + if (i >= 0) + { + /* It is a single character. If it matches we found our + index. Note that at the end of each list there is an + entry of length zero which represents the single byte + sequence. The first (and here only) byte was tested + already. */ + size_t cnt; + + /* With GCC 5.3 when compiling with -Os the compiler warns + that seq2.back_us, which becomes usrc, might be used + uninitialized. This can't be true because we pass a length + of -1 for len at the same time which means that this loop + never executes. */ + DIAG_PUSH_NEEDS_COMMENT; + DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); + for (cnt = 0; cnt < nhere && cnt < len; ++cnt) + if (cp[cnt] != usrc[cnt]) + break; + DIAG_POP_NEEDS_COMMENT; + + if (cnt == nhere) + { + /* Found it. */ + *cpp += nhere; + return i; + } + + /* Up to the next entry. */ + cp += nhere; + } + else + { + /* This is a range of characters. First decide whether the + current byte sequence lies in the range. */ + size_t cnt; + size_t offset; + + for (cnt = 0; cnt < nhere - 1 && cnt < len; ++cnt) + if (cp[cnt] != usrc[cnt]) + break; + + if (cnt < nhere - 1) + { + cp += 2 * nhere; + continue; + } + + if (cp[nhere - 1] > usrc[nhere -1]) + { + cp += 2 * nhere; + continue; + } + + if (cp[2 * nhere - 1] < usrc[nhere -1]) + { + cp += 2 * nhere; + continue; + } + + /* This range matches the next characters. Now find + the offset in the indirect table. */ + offset = usrc[nhere - 1] - cp[nhere - 1]; + *cpp += nhere; + + return indirect[-i + offset]; + } + } + + /* NOTREACHED */ + return 0x43219876; +} + +#endif /* weightwc.h */ |