| /* Copyright (C) 1996-2016 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 |
| |
| /* 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; |
| |
| for (cnt = 0; cnt < nhere && cnt < len; ++cnt) |
| if (cp[cnt] != usrc[cnt]) |
| break; |
| |
| 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 */ |