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uri.c
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: [email protected]
WWW: http://www.swi-prolog.org
Copyright (c) 2009-2023, VU University Amsterdam
SWI-Prolog Solutions b.v.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#ifdef __WINDOWS__
#define _CRT_SECURE_NO_WARNINGS 1
#define inline __inline
#endif
#include <SWI-Prolog.h>
#include <string.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <assert.h>
#include "utf8.h"
static size_t removed_dot_segments(size_t len, const pl_wchar_t *in,
pl_wchar_t *out);
static pl_wchar_t *remove_last_segment(const pl_wchar_t *base,
const pl_wchar_t *o);
/*******************************
* ERRORS *
*******************************/
static atom_t ATOM_query_value;
static atom_t ATOM_fragment;
static atom_t ATOM_path;
static atom_t ATOM_segment;
static functor_t FUNCTOR_equal2; /* =/2 */
static functor_t FUNCTOR_pair2; /* -/2 */
static functor_t FUNCTOR_uri_components5;
static functor_t FUNCTOR_uri_authority4;
static functor_t FUNCTOR_error2;
static functor_t FUNCTOR_syntax_error1;
static functor_t FUNCTOR_type_error2;
static functor_t FUNCTOR_domain_error2;
static int
syntax_error(const char *culprit)
{ term_t ex;
if ( (ex=PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_syntax_error1,
PL_CHARS, culprit,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
type_error(const char *expected, term_t found)
{ term_t ex;
if ( (ex=PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_type_error2,
PL_CHARS, expected,
PL_TERM, found,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
domain_error(const char *expected, term_t found)
{ term_t ex;
if ( (ex=PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_domain_error2,
PL_CHARS, expected,
PL_TERM, found,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
/*******************************
* ESCAPING *
*******************************/
#define ESC_PATH (CH_UNRESERVED|CH_SUBDELIM|CH_EX_PATH)
#define ESC_SEGMENT (CH_UNRESERVED|CH_SUBDELIM|CH_EX_SEGMENT)
#define ESC_QUERY (CH_UNRESERVED|CH_PSUBDELIM|CH_EX_QF)
#define ESC_QVALUE (CH_UNRESERVED|CH_QSUBDELIM|CH_EX_QF)
#define ESC_QNAME (CH_PCHAR)
#define ESC_FRAGMENT (CH_PCHAR|CH_EX_QF)
#define ESC_AUTH (CH_PCHAR)
#define ESC_PASSWD (CH_PCHAR)
#define ESC_USER (CH_PCHAR)
#define ESC_SCHEME (CH_SCHEME)
#define ESC_PORT (CH_DIGIT)
#define ESC_HOST (CH_UNRESERVED|CH_SUBDELIM)
#define CH_ALPHA 0x0001
#define CH_DIGIT 0x0002
#define CH_EX_UNRES 0x0004
#define CH_GENDELIM 0x0008
#define CH_SUBDELIM 0x0010
#define CH_URL 0x0020
#define CH_EX_PCHAR 0x0040
#define CH_EX_QF 0x0080 /* Extra query and fragment chars */
#define CH_EX_SCHEME 0x0100
#define CH_QSUBDELIM 0x0200
#define CH_PSUBDELIM 0x0400
#define CH_EX_PATH 0x0800
#define CH_EX_SEGMENT 0x1000
#define CH_SCHEME (CH_ALPHA|CH_DIGIT|CH_EX_SCHEME)
#define CH_UNRESERVED (CH_ALPHA|CH_DIGIT|CH_EX_UNRES)
#define CH_PCHAR (CH_UNRESERVED|CH_SUBDELIM|CH_EX_PCHAR)
static int charflags[128] = {0};
static int flags_done = 0;
static void
set_flags(const char *from, int flag)
{ for(; *from; from++)
charflags[from[0]&0xff] |= flag;
}
static void
fill_flags()
{ if ( !flags_done )
{ int c;
for(c='a'; c<='z'; c++)
charflags[c] |= CH_ALPHA;
for(c='A'; c<='Z'; c++)
charflags[c] |= CH_ALPHA;
for(c='0'; c<='9'; c++)
charflags[c] |= CH_DIGIT;
set_flags("-._~", CH_EX_UNRES);
set_flags(":/?#[]@", CH_GENDELIM);
set_flags("!$&'()+*,;=", CH_SUBDELIM);
set_flags("!$&'()*,;=", CH_PSUBDELIM); /* = CH_SUBDELIM - "+" */
set_flags("!$'()*,", CH_QSUBDELIM); /* = CH_SUBDELIM - "&=+" */
set_flags(":@", CH_EX_PCHAR);
set_flags("/@", CH_EX_PATH);
set_flags("@", CH_EX_SEGMENT);
set_flags("/?@", CH_EX_QF);
set_flags("+-.", CH_EX_SCHEME);
set_flags("/:?#&=", CH_URL);
flags_done = TRUE;
}
}
#define no_escape(c, f) \
(((c) < 128) && (charflags[(int)c] & (f)))
#define iri_no_escape(c, f) \
(((c) >= 128) || (c) == '%' || (charflags[(int)c] & (f)))
/* hex(const pl_wchar_t *in, int digits, int *value)
Get <digits> characters from in and interpret them as a hexadecimal
integer. Returns pointer to the end on success or NULL if error.
*/
static const pl_wchar_t *
hex(const pl_wchar_t *in, int digits, int *value)
{ int v = 0;
while(digits-- > 0)
{ int c = *in++;
if ( c >= '0' && c <= '9' )
v = (v<<4) + c - '0';
else if ( c >= 'A' && c <= 'F' )
v = (v<<4) + c + 10 - 'A';
else if ( c >= 'a' && c <= 'f' )
v = (v<<4) + c + 10 - 'a';
else
return NULL;
}
*value = v;
return in;
}
static const pl_wchar_t *
get_encoded_utf8_cont_1(const pl_wchar_t *in, int *val)
{ int c;
if ( in[0] == '%' && hex(in+1, 2, &c) )
{ if ( (c&0xc0) == 0x80 )
{ *val = (c&0x3f);
return in+3;
}
}
return NULL;
}
static const pl_wchar_t *
get_encoded_utf8_cont(const pl_wchar_t *in, int cnt, int *val)
{ int shift = cnt*6;
*val <<= shift;
shift -= 6;
while(cnt-->0)
{ int v0;
if ( (in = get_encoded_utf8_cont_1(in, &v0)) )
{ *val |= (v0<<shift);
shift -= 6;
} else
return NULL;
}
return in;
}
static const pl_wchar_t *
get_encoded_utf8(const pl_wchar_t *in, int *chr)
{ int c1;
if ( in[0] == '%' && hex(in+1, 2, &c1) )
{ in += 3;
if ( ISUTF8_MB(c1) )
{ if ( (c1&0xe0) == 0xc0 ) /* 2-byte */
{ *chr = (c1&0x1f);
return get_encoded_utf8_cont(in, 1, chr);
} else if ( (c1&0xf0) == 0xe0 ) /* 3-byte */
{ *chr = (c1&0xf);
return get_encoded_utf8_cont(in, 2, chr);
} else if ( (c1&0xf8) == 0xf0 ) /* 4-byte */
{ *chr = (c1&0x7);
return get_encoded_utf8_cont(in, 3, chr);
} else if ( (c1&0xfc) == 0xf8 ) /* 5-byte */
{ *chr = (c1&0x3);
return get_encoded_utf8_cont(in, 4, chr);
} else if ( (c1&0xfe) == 0xfc ) /* 6-byte */
{ *chr = (c1&0x1);
return get_encoded_utf8_cont(in, 5, chr);
} else
return NULL;
} else
{ *chr = c1;
return in; /* Encoded ASCII character */
}
}
return NULL;
}
/*******************************
* RANGES *
*******************************/
typedef struct range
{ const pl_wchar_t *start;
const pl_wchar_t *end;
} range;
/*******************************
* CHARACTER BUFFER *
*******************************/
typedef struct charbuf
{ pl_wchar_t *base;
pl_wchar_t *here;
pl_wchar_t *end;
pl_wchar_t tmp[256];
} charbuf;
static void
init_charbuf(charbuf *cb)
{ cb->base = cb->here = cb->tmp;
cb->end = &cb->tmp[sizeof(cb->tmp)/sizeof(pl_wchar_t)];
}
static int
init_charbuf_at_size(charbuf *cb, size_t size)
{ size++;
if ( size < sizeof(cb->tmp)/sizeof(pl_wchar_t) )
cb->base = cb->here = cb->tmp;
else
cb->base = cb->here = PL_malloc(size*sizeof(pl_wchar_t));
return TRUE;
}
static int
add_charbuf(charbuf *cb, int c)
{ if ( cb->here < cb->end )
{ *cb->here++ = c;
} else
{ size_t len = (cb->end-cb->base);
if ( cb->base == cb->tmp )
{ pl_wchar_t *n = PL_malloc(len*2*sizeof(pl_wchar_t));
memcpy(n, cb->base, sizeof(cb->tmp));
cb->base = n;
} else
{ cb->base = PL_realloc(cb->base, len*2*sizeof(pl_wchar_t));
}
cb->here = &cb->base[len];
cb->end = &cb->base[len*2];
*cb->here++ = c;
}
return TRUE;
}
static inline int
hexdigit(int val)
{ if ( val < 10 )
return '0'+val;
return 'A'-10+val;
}
static int
add_encoded_charbuf(charbuf *cb, int c, int flags)
{ if ( no_escape(c, flags) )
{ add_charbuf(cb, c);
} else
{ char tmp[6];
const char *end = utf8_put_char(tmp, c);
const char *s;
for(s=tmp; s<end; s++)
{ int b = s[0]&0xff;
add_charbuf(cb, '%');
add_charbuf(cb, hexdigit(b>>4));
add_charbuf(cb, hexdigit(b&0xf));
}
}
return TRUE;
}
static int
iri_add_encoded_charbuf(charbuf *cb, int c, int flags)
{ if ( iri_no_escape(c, flags) )
{ add_charbuf(cb, c);
} else
{ assert(c < 128);
add_charbuf(cb, '%');
add_charbuf(cb, hexdigit(c>>4));
add_charbuf(cb, hexdigit(c&0xf));
}
return TRUE;
}
static int
add_nchars_charbuf(charbuf *cb, size_t len, const pl_wchar_t *s)
{ if ( cb->here+len <= cb->end )
{ wcsncpy(cb->here, s, len);
cb->here += len;
} else
{ size_t n;
for(n=0; n<len; n++)
add_charbuf(cb, s[n]);
}
return TRUE;
}
static int
range_has_escape(const range *r, int flags)
{ const pl_wchar_t *s = r->start;
for(; s<r->end; s++)
{ if ( s[0] == '%' || (s[0] == '+' && flags == ESC_QVALUE) )
return TRUE;
}
return FALSE;
}
static int
range_is_unreserved(const range *r, int iri, int flags)
{ const pl_wchar_t *s = r->start;
if ( iri )
{ for(; s<r->end; s++)
{ if ( !iri_no_escape(s[0], flags) )
return FALSE;
}
} else
{ for(; s<r->end; s++)
{ if ( !no_escape(s[0], flags) )
return FALSE;
}
}
return TRUE;
}
static int
add_verb_range_charbuf(charbuf *cb, const range *r)
{ return add_nchars_charbuf(cb, r->end-r->start, r->start);
}
static int
add_decoded_range_charbuf(charbuf *cb, const range *r, int flags)
{ const pl_wchar_t *s = r->start;
while(s<r->end)
{ int c;
if ( *s == '%' )
{ const pl_wchar_t *e;
if ( (e=get_encoded_utf8(s, &c)) )
{ s = e;
} else if (hex(s+1, 2, &c) )
{ s += 3;
} else
{ c = *s++;
}
} else if ( *s == '+' && flags == ESC_QVALUE )
{ s++;
c = ' ';
} else
{ c = *s++;
}
add_charbuf(cb, c);
}
return TRUE;
}
static int
add_normalized_range_charbuf(charbuf *cb, const range *r, int iri, int flags)
{ const pl_wchar_t *s = r->start;
while(s<r->end)
{ int c;
if ( *s == '%' )
{ const pl_wchar_t *e;
if ( (e=get_encoded_utf8(s, &c)) )
{ if ( flags == ESC_QUERY &&
(c == '=' || c == '&' || c == ';') )
{ while( s<e )
add_charbuf(cb, *s++);
continue;
}
s = e;
} else if (hex(s+1, 2, &c) )
{ s += 3;
} else
{ c = *s++;
}
} else if ( *s == '+' && flags == ESC_QVALUE )
{ s++;
c = ' ';
} else
{ c = *s++;
}
if ( iri )
{ iri_add_encoded_charbuf(cb, c, flags);
} else
{ add_encoded_charbuf(cb, c, flags);
}
}
return TRUE;
}
/* add_range_charbuf(charbuf *cb, const range *r, int iri, int flags)
Add a range of characters while normalizing %-encoding. This
implies not to use encoding if it is not needed and upcase
%xx to %XX otherwise.
If iri == TRUE, values >= 128 are not escaped. Otherwise they
use %-encoded UTF-8
*/
static int
add_range_charbuf(charbuf *cb, const range *r, int unesc, int iri, int flags)
{ if ( unesc && range_has_escape(r, flags) )
{ return add_normalized_range_charbuf(cb, r, iri, flags);
} else if ( range_is_unreserved(r, iri, flags) )
{ add_nchars_charbuf(cb, r->end-r->start, r->start);
} else
{ const pl_wchar_t *s = r->start;
if ( iri )
{ while(s<r->end)
iri_add_encoded_charbuf(cb, *s++, flags);
} else
{ while(s<r->end)
add_encoded_charbuf(cb, *s++, flags);
}
}
return TRUE;
}
/* add_lwr_range_charbuf(charbuf *cb, const range *r,
int unesc, int iri, int flags)
Add a range of characters while normalizing %-encoding and
mapping all characters to lowercase.
FIXME: encoding and decoding compatible to add_range_charbuf();
*/
static int
add_lwr_range_charbuf(charbuf *cb, const range *r, int unesc, int iri, int flags)
{ const pl_wchar_t *s = r->start;
while(s<r->end)
{ int c;
if ( unesc && *s == '%' )
{ const pl_wchar_t *e;
if ( (e=get_encoded_utf8(s, &c)) )
{ s = e;
} else if (hex(s+1, 2, &c) )
{ s += 3;
} else
{ c = *s++;
}
} else
{ c = *s++;
}
if ( iri )
iri_add_encoded_charbuf(cb, towlower((wint_t)c), flags);
else
add_encoded_charbuf(cb, towlower((wint_t)c), flags);
}
return TRUE;
}
static void
free_charbuf(charbuf *cb)
{ if ( cb->base != cb->tmp )
PL_free(cb->base);
}
#define TXT_EX_TEXT (CVT_ATOM|CVT_STRING|CVT_EXCEPTION)
static int
get_text_arg(term_t term, int pos, size_t *len, pl_wchar_t **s, int flags)
{ term_t tmp = PL_new_term_ref();
_PL_get_arg(pos, term, tmp);
if ( PL_is_variable(tmp) )
return FALSE;
if ( !PL_get_wchars(tmp, len, s, flags) )
return -1;
return TRUE;
}
/** uri_components(+URI, -Components)
Based on RFC-3986 regular expression:
==
^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
12 3 4 5 6 7 8 9
==
*/
typedef struct uri_component_ranges
{ range scheme;
range authority;
range path;
range query;
range fragment;
} uri_component_ranges;
static const pl_wchar_t *
skip_not(const pl_wchar_t *in, const pl_wchar_t *end, const pl_wchar_t *chars)
{ if ( !chars[1] )
{ for(; in < end; in++)
{ if ( chars[0] == in[0] )
return in;
}
} else
{ for(; in < end; in++)
{ if ( wcschr(chars, in[0]) )
return in;
}
}
return in;
}
static int
unify_range(term_t t, const range *r)
{ if ( r->start )
return PL_unify_wchars(t, PL_ATOM, r->end - r->start, r->start);
return TRUE;
}
static int
parse_uri(uri_component_ranges *ranges, size_t len, const pl_wchar_t *s)
{ const pl_wchar_t *end = &s[len];
const pl_wchar_t *here = s;
const pl_wchar_t *e;
memset(ranges, 0, sizeof(*ranges));
e = skip_not(here, end, L":/?#");
if ( e > s && e[0] == ':' ) /* 1&2 */
{ ranges->scheme.start = s;
ranges->scheme.end = e;
here = e+1;
}
if ( here[0] == '/' && here[1] == '/' ) /* 3 */
{ here += 2; /* 4 */
e = skip_not(here, end, L"/?#");
ranges->authority.start = here;
ranges->authority.end = e;
here = e; /* 5 */
}
e = skip_not(here, end, L"?#");
ranges->path.start = here;
ranges->path.end = e;
here = e; /* 6 */
if ( here[0] == '?' )
{ here++; /* 7 */
e = skip_not(here, end, L"#");
ranges->query.start = here;
ranges->query.end = e;
here = e; /* 8 */
}
if ( here[0] == '#' )
{ here++; /* 9 */
ranges->fragment.start = here;
ranges->fragment.end = end;
}
return TRUE;
}
static foreign_t
uri_components(term_t URI, term_t components)
{ pl_wchar_t *s;
size_t len;
if ( PL_get_wchars(URI, &len, &s, CVT_ATOM|CVT_STRING|CVT_LIST) )
{ uri_component_ranges ranges;
term_t rt = PL_new_term_refs(6);
term_t av = rt+1;
parse_uri(&ranges, len, s);
unify_range(av+0, &ranges.scheme);
unify_range(av+1, &ranges.authority);
unify_range(av+2, &ranges.path);
unify_range(av+3, &ranges.query);
unify_range(av+4, &ranges.fragment);
return (PL_cons_functor_v(rt, FUNCTOR_uri_components5, av) &&
PL_unify(components, rt));
} else if ( PL_is_functor(components, FUNCTOR_uri_components5) )
{ charbuf b;
int rc;
init_charbuf(&b);
/* schema */
if ( (rc=get_text_arg(components, 1, &len, &s, TXT_EX_TEXT)) == TRUE )
{ add_nchars_charbuf(&b, len, s);
add_charbuf(&b, ':');
} else if ( rc == -1 )
{ free_charbuf(&b);
return FALSE;
}
/* authority */
if ( (rc=get_text_arg(components, 2, &len, &s, TXT_EX_TEXT)) == TRUE )
{ add_charbuf(&b, '/');
add_charbuf(&b, '/');
add_nchars_charbuf(&b, len, s);
} else if ( rc == -1 )
{ free_charbuf(&b);
return FALSE;
}
/* path */
if ( (rc=get_text_arg(components, 3, &len, &s, TXT_EX_TEXT)) == TRUE )
{ add_nchars_charbuf(&b, len, s);
} else if ( rc == -1 )
{ free_charbuf(&b);
return FALSE;
}
/* query */
if ( (rc=get_text_arg(components, 4, &len, &s, TXT_EX_TEXT)) == TRUE )
{ if ( len > 0 )
{ add_charbuf(&b, '?');
add_nchars_charbuf(&b, len, s);
}
} else if ( rc == -1 )
{ free_charbuf(&b);
return FALSE;
}
/* fragment */
if ( (rc=get_text_arg(components, 5, &len, &s, TXT_EX_TEXT)) == TRUE )
{ add_charbuf(&b, '#');
add_nchars_charbuf(&b, len, s);
} else if ( rc == -1 )
{ free_charbuf(&b);
return FALSE;
}
rc = PL_unify_wchars(URI, PL_ATOM, b.here-b.base, b.base);
free_charbuf(&b);
return rc;
} else /* generate an error */
{ return PL_get_wchars(URI, &len, &s,
CVT_ATOM|CVT_STRING|CVT_LIST|CVT_EXCEPTION);
}
}
/** uri_is_global(+URI) is semidet.
*/
static foreign_t
uri_is_global(term_t URI)
{ pl_wchar_t *s;
size_t len;
if ( PL_get_wchars(URI, &len, &s,
CVT_ATOM|CVT_STRING|CVT_LIST|CVT_EXCEPTION) )
{ const pl_wchar_t *e;
const pl_wchar_t *end = &s[len];
range r;
fill_flags();
e = skip_not(s, end, L":/?#");
if ( e > s+1 && e[0] == ':' )
{ r.start = s;
r.end = e;
if ( range_is_unreserved(&r, FALSE, CH_SCHEME) )
return TRUE;
}
}
return FALSE;
}
/*******************************
* QUERY-STRING *
*******************************/
static int
unify_decoded_atom(term_t t, range *r, int flags)
{ if ( range_has_escape(r, flags) )
{ charbuf b;
int rc;
init_charbuf(&b);
add_decoded_range_charbuf(&b, r, flags);
rc = PL_unify_wchars(t, PL_ATOM, b.here - b.base, b.base);
free_charbuf(&b);
return rc;
} else
{ return unify_range(t, r);
}
}
static int
unify_query_string_components(term_t list, size_t len, const pl_wchar_t *qs)
{ if ( len == 0 )
{ return PL_unify_nil(list);
} else
{ term_t tail = PL_copy_term_ref(list);
term_t head = PL_new_term_ref();
term_t eq = PL_new_term_refs(3);
term_t nv = eq+1;
const pl_wchar_t *end = &qs[len];
while(qs < end)
{ range name, value;
name.start = qs;
name.end = skip_not(qs, end, L"=");
if ( name.end < end )
{ value.start = name.end+1;
value.end = skip_not(value.start, end, L"&;");
qs = value.end+1;
} else
{ return syntax_error("illegal_uri_query");
}
PL_STRINGS_MARK();
PL_put_variable(nv+0);
PL_put_variable(nv+1);
unify_decoded_atom(nv+0, &name, ESC_QNAME);
unify_decoded_atom(nv+1, &value, ESC_QVALUE);
PL_STRINGS_RELEASE();
if ( !PL_cons_functor_v(eq, FUNCTOR_equal2, nv) ||
!PL_unify_list(tail, head, tail) ||
!PL_unify(head, eq) )
return FALSE;
}
return PL_unify_nil(tail);
}
}
static int
add_encoded_term_charbuf(charbuf *cb, term_t value, int iri, int flags)
{ pl_wchar_t *s;
range r;
size_t len;
if ( !PL_get_wchars(value, &len, &s, CVT_ATOMIC|CVT_EXCEPTION) )
return FALSE;
r.start = s;
r.end = r.start+len;
if ( range_is_unreserved(&r, iri, flags) )
{ add_nchars_charbuf(cb, r.end-r.start, r.start);
} else
{ const pl_wchar_t *s = r.start;
while(s<r.end)
add_encoded_charbuf(cb, *s++, flags);
}
return TRUE;
}
/** uri_query_components(+QueryString, -ValueList) is det.
*/
static foreign_t
uri_query_components(term_t string, term_t list)
{ pl_wchar_t *s;
size_t len;
if ( PL_get_wchars(string, &len, &s, CVT_ATOM|CVT_STRING|CVT_LIST) )
{ return unify_query_string_components(list, len, s);
} else if ( PL_is_list(list) )
{ term_t tail = PL_copy_term_ref(list);
term_t head = PL_new_term_ref();
term_t nv = PL_new_term_refs(2);
charbuf out;
int rc;
fill_flags();
init_charbuf(&out);
while( PL_get_list(tail, head, tail) )
{ atom_t fname;
size_t arity;
if ( PL_is_functor(head, FUNCTOR_equal2) ||
PL_is_functor(head, FUNCTOR_pair2) )
{ _PL_get_arg(1, head, nv+0);
_PL_get_arg(2, head, nv+1);
} else if ( PL_get_name_arity(head, &fname, &arity) && arity == 1 )
{ PL_put_atom(nv+0, fname);
_PL_get_arg(1, head, nv+1);
} else
{ free_charbuf(&out);
return type_error("name_value", head);
}
if ( out.here != out.base )
add_charbuf(&out, '&');
if ( !add_encoded_term_charbuf(&out, nv+0, FALSE, ESC_QNAME) )
{ free_charbuf(&out);
return FALSE;
}
add_charbuf(&out, '=');
if ( !add_encoded_term_charbuf(&out, nv+1, FALSE, ESC_QVALUE) )
{ free_charbuf(&out);
return FALSE;
}
}
rc = PL_unify_wchars(string, PL_ATOM, out.here-out.base, out.base);
free_charbuf(&out);
return rc;
} else
{ return PL_get_wchars(string, &len, &s,
CVT_ATOM|CVT_STRING|CVT_LIST|CVT_EXCEPTION);
}
return FALSE;
}
/** uri_encoded(+What, +String, -Encoded)
*/
static foreign_t
uri_encoded(term_t what, term_t qv, term_t enc)
{ pl_wchar_t *s;
size_t len;
atom_t w;
int flags;
if ( !PL_get_atom(what, &w) )
return type_error("atom", what);
if ( w == ATOM_query_value )
flags = ESC_QVALUE;
else if ( w == ATOM_fragment )
flags = ESC_FRAGMENT;
else if ( w == ATOM_path )