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95 lines
2.3 KiB
Text
95 lines
2.3 KiB
Text
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/*
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Copyright (c) 2015, MariaDB Foundation
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef MY_FUNCTION_NAME
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#error MY_FUNCTION_NAME is not defined
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#endif
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#if defined(IS_MB3_CHAR) && !defined(IS_MB2_CHAR)
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#error IS_MB3_CHAR is defined, while IS_MB2_CHAR is not!
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#endif
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#if defined(IS_MB4_CHAR) && !defined(IS_MB3_CHAR)
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#error IS_MB4_CHAR is defined, while IS_MB3_CHAR is not!
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#endif
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#ifdef WELL_FORMED_LEN
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/**
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Returns well formed length of a character string with
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variable character length for character sets with:
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- mbminlen == 1
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- mbmaxlen == 2, 3, or 4
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*/
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static size_t
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MY_FUNCTION_NAME(well_formed_len)(CHARSET_INFO *cs __attribute__((unused)),
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const char *b, const char *e,
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size_t nchars, int *error)
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{
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const char *b0= b;
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DBUG_ASSERT(cs->mbminlen == 1);
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DBUG_ASSERT(cs->mbmaxlen <= 4);
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for (*error= 0 ; b < e && nchars-- ; )
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{
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if ((uchar) b[0] < 128)
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{
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b++; /* Single byte ASCII character */
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continue;
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}
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if (b + 2 <= e && IS_MB2_CHAR(b[0], b[1]))
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{
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b+= 2; /* Double byte character */
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continue;
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}
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#ifdef IS_MB3_CHAR
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if (b + 3 <= e && IS_MB3_CHAR(b[0], b[1], b[2]))
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{
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b+= 3; /* Three-byte character */
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continue;
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}
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#endif
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#ifdef IS_MB4_CHAR
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if (b + 4 <= e && IS_MB4_CHAR(b[0], b[1], b[2], b[3]))
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{
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b+= 4; /* Four-byte character */
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continue;
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}
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#endif
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#ifdef IS_8BIT_CHAR
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if (IS_8BIT_CHAR(b[0]))
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{
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b++; /* Single byte non-ASCII character, e.g. half width kana in sjis */
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continue;
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}
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#endif
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/* Wrong byte sequence */
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*error= 1;
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break;
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}
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return b - b0;
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}
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#endif /* WELL_FORMED_LEN */
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