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yap-6.3/os/pl-text.h

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker and Anjo Anjewierden
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2002, University of Amsterdam
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 2.1 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
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
#ifndef PL_TEXT_H_INCLUDED
#define PL_TEXT_H_INCLUDED
typedef enum
{ PL_CHARS_MALLOC, /* malloced data */
PL_CHARS_RING, /* stored in the buffer ring */
PL_CHARS_HEAP, /* stored in program area (atoms) */
PL_CHARS_STACK, /* stored on the global stack */
PL_CHARS_LOCAL /* stored in in-line buffer */
} PL_chars_alloc_t;
typedef struct
{ union
{ char *t; /* tranditional 8-bit char* */
pl_wchar_t *w; /* wide character string */
} text;
size_t length;
/* private stuff */
IOENC encoding; /* how it is encoded */
PL_chars_alloc_t storage; /* how it is stored */
int canonical; /* TRUE: ENC_ISO_LATIN_1 or ENC_WCHAR */
char buf[100]; /* buffer for simple stuff */
} PL_chars_t;
#define PL_init_text(txt) \
{ (txt)->text.t = NULL; \
(txt)->encoding = ENC_UNKNOWN; \
(txt)->storage = PL_CHARS_LOCAL; \
(txt)->canonical = FALSE; \
}
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int PL_unify_text(term_t term, term_t tail, PL_chars_t *text, int type);
int PL_unify_text_range(term_t term, PL_chars_t *text,
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size_t from, size_t len, int type);
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int PL_promote_text(PL_chars_t *text);
int PL_demote_text(PL_chars_t *text);
int PL_mb_text(PL_chars_t *text, int flags);
int PL_canonise_text(PL_chars_t *text);
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int PL_cmp_text(PL_chars_t *t1, size_t o1, PL_chars_t *t2, size_t o2,
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size_t len);
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int PL_concat_text(int n, PL_chars_t **text, PL_chars_t *result);
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void PL_free_text(PL_chars_t *text);
void PL_save_text(PL_chars_t *text, int flags);
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COMMON(int) PL_get_text__LD(term_t l, PL_chars_t *text, int flags ARG_LD);
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COMMON(Atom) textToAtom(PL_chars_t *text);
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COMMON(IOSTREAM *) Sopen_text(PL_chars_t *text, const char *mode);
COMMON(void) PL_text_recode(PL_chars_t *text, IOENC encoding);
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/* pl-fli.c */
COMMON(int) get_atom_ptr_text(Atom atom, PL_chars_t *text);
COMMON(int) get_atom_text(atom_t atom, PL_chars_t *text);
COMMON(int) get_string_text(atom_t atom, PL_chars_t *text ARG_LD);
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static inline int
text_get_char(const PL_chars_t *t, size_t i)
{ assert(t->canonical);
return t->encoding == ENC_ISO_LATIN_1 ? t->text.t[i]&0xff
: t->text.w[i];
}
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#endif /*PL_TEXT_H_INCLUDED*/