117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
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/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: jan@science.uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2005, University of Amsterdam
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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 Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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#ifndef PLVERSION
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#include <SWI-Prolog.h>
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#endif
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Ideally we should have various of these tables and distinguish the host,
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path, query and fragment parts. See RFC3986 for details.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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static char *
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uri_ok()
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{ static char ok[128];
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int done = FALSE;
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const char *s;
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if ( !done )
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{ int i;
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for(i='a'; i<='z'; i++)
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ok[i] = TRUE;
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for(i='A'; i<='Z'; i++)
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ok[i] = TRUE;
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for(i='0'; i<='9'; i++)
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ok[i] = TRUE;
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for(s="-_.!~*'()"; *s; s++) /* used to have [], but these general delimiters */
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ok[(int)*s] = TRUE; /* cannot be in a fragment or path */
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for(s=";/&?:@=#"; *s; s++)
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ok[(int)*s] = TRUE;
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done = TRUE;
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}
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return ok;
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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RDF (Unicode) URIs are first mapped to UTF-8 and then unsafe and
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characters outside the printable US-ASCII range are represented as %XX
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where XX is the hexadecimal version of the octed. We moved this to C to
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exploit much faster character operations.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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static foreign_t
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rdf_quote_uri(term_t uri, term_t quoted)
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{ char *in;
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const char *s;
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const char *ok = uri_ok();
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size_t len;
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int nok;
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if ( !PL_get_nchars(uri, &len, &in, CVT_ATOM|REP_UTF8|CVT_EXCEPTION) )
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return FALSE;
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for(s=in, nok=0; *s; s++)
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{ int c = *s&0xff;
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if ( c >= 128 || !ok[c] )
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{ nok++;
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}
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}
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if ( nok )
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{ char *buf = alloca(len+nok*2+1);
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char *o = buf;
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static char xdigit[] = "0123456789ABCDEF";
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for(s=in; *s; s++)
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{ int c = *s&0xff;
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if ( c >= 128 || !ok[c] )
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{ *o++ = '%';
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*o++ = xdigit[(c>>4)&0xf];
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*o++ = xdigit[c&0xf];
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} else
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{ *o++ = c;
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}
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}
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*o = '\0';
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return PL_unify_atom_nchars(quoted, len+nok*2, buf);
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}
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return PL_unify(uri, quoted);
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}
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