92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker and Anjo Anjewierden
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E-mail: jan@swi.psy.uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2002, University of Amsterdam
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PL_TEXT_H_INCLUDED
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#define PL_TEXT_H_INCLUDED
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typedef enum
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{ PL_CHARS_MALLOC, /* malloced data */
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PL_CHARS_RING, /* stored in the buffer ring */
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PL_CHARS_HEAP, /* stored in program area (atoms) */
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PL_CHARS_STACK, /* stored on the global stack */
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PL_CHARS_LOCAL /* stored in in-line buffer */
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} PL_chars_alloc_t;
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typedef struct
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{ union
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{ char *t; /* tranditional 8-bit char* */
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pl_wchar_t *w; /* wide character string */
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} text;
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size_t length;
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/* private stuff */
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IOENC encoding; /* how it is encoded */
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PL_chars_alloc_t storage; /* how it is stored */
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int canonical; /* TRUE: ENC_ISO_LATIN_1 or ENC_WCHAR */
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char buf[100]; /* buffer for simple stuff */
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} PL_chars_t;
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#define PL_init_text(txt) \
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{ (txt)->text.t = NULL; \
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(txt)->encoding = ENC_UNKNOWN; \
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(txt)->storage = PL_CHARS_LOCAL; \
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(txt)->canonical = FALSE; \
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}
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int PL_unify_text(term_t term, term_t tail, PL_chars_t *text, int type);
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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);
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int PL_demote_text(PL_chars_t *text);
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int PL_mb_text(PL_chars_t *text, int flags);
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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);
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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);
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COMMON(void) PL_text_recode(PL_chars_t *text, IOENC encoding);
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/* pl-fli.c */
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COMMON(int) get_atom_ptr_text(Atom atom, PL_chars_t *text);
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COMMON(int) get_atom_text(atom_t atom, PL_chars_t *text);
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COMMON(int) get_string_text(atom_t atom, PL_chars_t *text ARG_LD);
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static inline int
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text_get_char(const PL_chars_t *t, size_t i)
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{ assert(t->canonical);
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return t->encoding == ENC_ISO_LATIN1 ? t->text.t[i]&0xff
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: t->text.w[i];
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}
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#endif /*PL_TEXT_H_INCLUDED*/
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