diff options
Diffstat (limited to 'libguile/extchrs.c')
-rw-r--r-- | libguile/extchrs.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/libguile/extchrs.c b/libguile/extchrs.c new file mode 100644 index 000000000..44d9a14a1 --- /dev/null +++ b/libguile/extchrs.c @@ -0,0 +1,146 @@ +/* Copyright (C) 1995,1996 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * As a special exception, the Free Software Foundation gives permission + * for additional uses of the text contained in its release of GUILE. + * + * The exception is that, if you link the GUILE library with other files + * to produce an executable, this does not by itself cause the + * resulting executable to be covered by the GNU General Public License. + * Your use of that executable is in no way restricted on account of + * linking the GUILE library code into it. + * + * This exception does not however invalidate any other reasons why + * the executable file might be covered by the GNU General Public License. + * + * This exception applies only to the code released by the + * Free Software Foundation under the name GUILE. If you copy + * code from other Free Software Foundation releases into a copy of + * GUILE, as the General Public License permits, the exception does + * not apply to the code that you add in this way. To avoid misleading + * anyone as to the status of such modified files, you must delete + * this exception notice from them. + * + * If you write modifications of your own for GUILE, it is your choice + * whether to permit this exception to apply to your modifications. + * If you do not wish that, delete this exception notice. + */ + + +#include "extchrs.h" + + + +#ifdef FAKE_EXT_SCM_CHARS + +#ifdef __STDC__ +int +xmblen (const char * str, size_t size) +#else +int +xmblen (str, size) + const char * str; + size_t size; +#endif +{ + if (!str) + return 0; + + if (*(unsigned char *)str > 127) + return ((size < 4) + ? -1 + : 4); + else if (!*str) + return 0; + else + return 1; +} + +#ifdef __STDC__ +int +xwctomb (char * _str, int c) +#else +int +xwctomb (_str, c) + char * _str; + int c; +#endif +{ + unsigned char * str; + str = (unsigned char *)_str; + if (!str) + return 0; + + if (!c) + { + *str = 0; + return 0; + } + + + if (c < 127) + { + *str = c; + return 1; + } + + str[0] = 255; + str[1] = 0x80 | ((c >> 10) & 0x3f); + str[2] = 0x80 | ((c >> 4) & 0x3f); + str[3] = 0x80 | (c & 0xf); + return 4; +} + +#ifdef __STDC__ +int +xmbtowc (xwchar_t * result, const unsigned char * _str, size_t size) +#else +int +xmbtowc (result, str, size) + xwchar_t * result; + const unsigned char * _str; + size_t size; +#endif +{ + const unsigned char * str; + str = (const unsigned char *)_str; + if (!str) + return 0; + + if ((size == 0) || !*str) + { + *result = 0; + return 0; + } + + if (*str < 128) + { + *result = *str; + return 1; + } + + if ( (*str != 255) + || (size < 4)) + return -1; + + *result = ( ((str[1] & 0x3f) << 10) + | ((str[2] & 0x3f) << 4) + | (str[3] & 0xf)); + return 4; +} + +#endif /* FAKE_EXT_SCM_CHARS */ + |