Mercurial > hg > octave-nkf > gnulib-hg
changeset 8572:4f7a3af633a1
New module 'unistr/u8-mbtoucr'.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Wed, 28 Mar 2007 21:36:32 +0000 |
| parents | 2c310f4a00e7 |
| children | 4d05b7be1efa |
| files | lib/unistr/u8-mbtoucr.c modules/unistr/u8-mbtoucr |
| diffstat | 2 files changed, 311 insertions(+), 0 deletions(-) [+] |
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new file mode 100644 --- /dev/null +++ b/lib/unistr/u8-mbtoucr.c @@ -0,0 +1,287 @@ +/* Look at first character in UTF-8 string, returning an error code. + Copyright (C) 1999-2002, 2006-2007 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2001. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU Library General Public License as published + by the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + USA. */ + +#include <config.h> + +/* Specification. */ +#include "unistr.h" + +int +u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n) +{ + uint8_t c = *s; + + if (c < 0x80) + { + *puc = c; + return 1; + } + else if (c >= 0xc2) + { + if (c < 0xe0) + { + if (n >= 2) + { + if ((s[1] ^ 0x80) < 0x40) + { + *puc = ((unsigned int) (c & 0x1f) << 6) + | (unsigned int) (s[1] ^ 0x80); + return 2; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + else if (c < 0xf0) + { + if (n >= 2) + { + if ((s[1] ^ 0x80) < 0x40 + && (c >= 0xe1 || s[1] >= 0xa0) + && (c != 0xed || s[1] < 0xa0)) + { + if (n >= 3) + { + if ((s[2] ^ 0x80) < 0x40) + { + *puc = ((unsigned int) (c & 0x0f) << 12) + | ((unsigned int) (s[1] ^ 0x80) << 6) + | (unsigned int) (s[2] ^ 0x80); + return 3; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + else if (c < 0xf8) + { + if (n >= 2) + { + if ((s[1] ^ 0x80) < 0x40 + && (c >= 0xf1 || s[1] >= 0x90) +#if 1 + && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) +#endif + ) + { + if (n >= 3) + { + if ((s[2] ^ 0x80) < 0x40) + { + if (n >= 4) + { + if ((s[3] ^ 0x80) < 0x40) + { + *puc = ((unsigned int) (c & 0x07) << 18) + | ((unsigned int) (s[1] ^ 0x80) << 12) + | ((unsigned int) (s[2] ^ 0x80) << 6) + | (unsigned int) (s[3] ^ 0x80); + return 4; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } +#if 0 + else if (c < 0xfc) + { + if (n >= 2) + { + if ((s[1] ^ 0x80) < 0x40 + && (c >= 0xf9 || s[1] >= 0x88)) + { + if (n >= 3) + { + if ((s[2] ^ 0x80) < 0x40) + { + if (n >= 4) + { + if ((s[3] ^ 0x80) < 0x40) + { + if (n >= 5) + { + if ((s[4] ^ 0x80) < 0x40) + { + *puc = ((unsigned int) (c & 0x03) << 24) + | ((unsigned int) (s[1] ^ 0x80) << 18) + | ((unsigned int) (s[2] ^ 0x80) << 12) + | ((unsigned int) (s[3] ^ 0x80) << 6) + | (unsigned int) (s[4] ^ 0x80); + return 5; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + else if (c < 0xfe) + { + if (n >= 2) + { + if ((s[1] ^ 0x80) < 0x40 + && (c >= 0xfd || s[1] >= 0x84)) + { + if (n >= 3) + { + if ((s[2] ^ 0x80) < 0x40) + { + if (n >= 4) + { + if ((s[3] ^ 0x80) < 0x40) + { + if (n >= 5) + { + if ((s[4] ^ 0x80) < 0x40) + { + if (n >= 6) + { + if ((s[5] ^ 0x80) < 0x40) + { + *puc = ((unsigned int) (c & 0x01) << 30) + | ((unsigned int) (s[1] ^ 0x80) << 24) + | ((unsigned int) (s[2] ^ 0x80) << 18) + | ((unsigned int) (s[3] ^ 0x80) << 12) + | ((unsigned int) (s[4] ^ 0x80) << 6) + | (unsigned int) (s[5] ^ 0x80); + return 6; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } +#endif + } + /* invalid multibyte character */ + *puc = 0xfffd; + return -1; +}
new file mode 100644 --- /dev/null +++ b/modules/unistr/u8-mbtoucr @@ -0,0 +1,24 @@ +Description: +Look at first character in UTF-8 string, returning an error code upon failure. + +Files: +lib/unistr/u8-mbtoucr.c + +Depends-on: +unistr/base + +configure.ac: +gl_MODULE_INDICATOR([unistr/u8-mbtoucr]) + +Makefile.am: +lib_SOURCES += unistr/u8-mbtoucr.c + +Include: +"unistr.h" + +License: +LGPL + +Maintainer: +Bruno Haible +