diff options
Diffstat (limited to 'avahi-common/utf8.c')
-rw-r--r-- | avahi-common/utf8.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/avahi-common/utf8.c b/avahi-common/utf8.c new file mode 100644 index 0000000..f52ce55 --- /dev/null +++ b/avahi-common/utf8.c @@ -0,0 +1,115 @@ +/* $Id */ + +/* This file is based on the GLIB utf8 validation functions. The + * original license text follows. */ + +/* gutf8.c - Operations on UTF-8 strings. + * + * Copyright (C) 1999 Tom Tromey + * Copyright (C) 2000 Red Hat, Inc. + * + * This 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 of the License, or (at your option) any later version. + * + * This 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 this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> + +#include "utf8.h" + +#define UNICODE_VALID(Char) \ + ((Char) < 0x110000 && \ + (((Char) & 0xFFFFF800) != 0xD800) && \ + ((Char) < 0xFDD0 || (Char) > 0xFDEF) && \ + ((Char) & 0xFFFE) != 0xFFFE) + + +#define CONTINUATION_CHAR \ + do { \ + if ((*(const unsigned char *)p & 0xc0) != 0x80) /* 10xxxxxx */ \ + goto error; \ + val <<= 6; \ + val |= (*(const unsigned char *)p) & 0x3f; \ + } while(0) + + +const char * +avahi_utf8_valid (const char *str) + +{ + unsigned val = 0; + unsigned min = 0; + const char *p; + + for (p = str; *p; p++) + { + if (*(const unsigned char *)p < 128) + /* done */; + else + { + const char *last; + + last = p; + if ((*(const unsigned char *)p & 0xe0) == 0xc0) /* 110xxxxx */ + { + if ( ((*(const unsigned char *)p & 0x1e) == 0)) + goto error; + p++; + if ( ((*(const unsigned char *)p & 0xc0) != 0x80)) /* 10xxxxxx */ + goto error; + } + else + { + if ((*(const unsigned char *)p & 0xf0) == 0xe0) /* 1110xxxx */ + { + min = (1 << 11); + val = *(const unsigned char *)p & 0x0f; + goto TWO_REMAINING; + } + else if ((*(const unsigned char *)p & 0xf8) == 0xf0) /* 11110xxx */ + { + min = (1 << 16); + val = *(const unsigned char *)p & 0x07; + } + else + goto error; + + p++; + CONTINUATION_CHAR; + TWO_REMAINING: + p++; + CONTINUATION_CHAR; + p++; + CONTINUATION_CHAR; + + if ( (val < min)) + goto error; + + if ( (!UNICODE_VALID(val))) + goto error; + } + + continue; + + error: + return NULL; + } + } + + return str; +} |