461 lines
11 KiB
C
461 lines
11 KiB
C
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/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: charcodes.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Character codes and character conversion *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* This file includes the definition of a pipe related IO.
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*
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*/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "yapio.h"
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#ifdef _WIN32
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#if HAVE_IO_H
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/* Windows */
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#include <io.h>
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#endif
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#if HAVE_SOCKET
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#include <winsock2.h>
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#endif
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#include <windows.h>
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#ifndef S_ISDIR
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#define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR)
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#endif
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#endif
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#include "iopreds.h"
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#include "eval.h"
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static Int p_change_type_of_char( USES_REGS1);
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static Int p_type_of_char( USES_REGS1);
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Term
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Yap_StringToNumberTerm(char *s, encoding_t enc)
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{
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int sno;
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Term t;
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sno = Yap_open_buf_read_stream(s, strlen(s)+1, enc, MEM_BUF_USER);
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if (sno < 0)
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return FALSE;
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GLOBAL_Stream[sno].encoding = enc;
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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while(*s && isblank(*s++));
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t = Yap_scan_num(GLOBAL_Stream+sno);
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GLOBAL_Stream[sno].status = Free_Stream_f;
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if (t == TermNil) {
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CACHE_REGS
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int sign = 1;
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if (s[0] == '+') {
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s++;
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}
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if (s[0] == '-') {
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s++;
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sign = -1;
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}
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if(strcmp(s,"inf") == 0) {
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if (sign > 0) {
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return MkFloatTerm(INFINITY);
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} else {
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return MkFloatTerm(-INFINITY);
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}
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}
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if(strcmp(s,"nan") == 0) {
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if (sign > 0) {
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return MkFloatTerm(NAN);
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} else {
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return MkFloatTerm(-NAN);
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}
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}
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}
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return t;
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}
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char *
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Yap_TermToString(Term t, char *s, size_t sz, size_t *length, encoding_t encp, int flags)
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{
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CACHE_REGS
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int sno = Yap_open_buf_write_stream(&s, &sz);
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int old_output_stream = LOCAL_c_output_stream;
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if (sno < 0)
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return NULL;
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LOCAL_c_output_stream = sno;
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if (encp)
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GLOBAL_Stream[sno].encoding = encp;
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Yap_plwrite (t, GLOBAL_Stream+sno, 0, flags, 1200);
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s[GLOBAL_Stream[sno].u.mem_string.pos] = '\0';
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LOCK(GLOBAL_Stream[sno].streamlock);
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GLOBAL_Stream[sno].status = Free_Stream_f;
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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LOCAL_c_output_stream = old_output_stream;
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if ( EX == 0 ) return s;
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return NULL;
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}
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static encoding_t
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DefaultEncoding(void)
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{
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char *s = getenv("LANG");
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size_t sz;
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/* if we don't have a LANG then just use ISO_LATIN1 */
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if (s == NULL)
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s = getenv("LC_CTYPE");
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if (s == NULL)
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return ENC_ISO_LATIN1;
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sz = strlen(s);
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if (sz >= 5) {
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if (s[sz-5] == 'U' &&
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s[sz-4] == 'T' &&
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s[sz-3] == 'F' &&
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s[sz-2] == '-' &&
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s[sz-1] == '8') {
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return ENC_ISO_UTF8;
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}
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}
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return ENC_ISO_ANSI;
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}
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encoding_t
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Yap_DefaultEncoding(void)
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{
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CACHE_REGS
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return LOCAL_encoding;
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}
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void
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Yap_SetDefaultEncoding(encoding_t new_encoding)
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{
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CACHE_REGS
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LOCAL_encoding = new_encoding;
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}
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encoding_t
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Yap_InitialEncoding(void)
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{
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char *s = getenv("LANG");
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size_t sz;
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/* if we don't have a LANG then just use ISO_LATIN1 */
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if (s == NULL)
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s = getenv("LC_CTYPE");
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if (s == NULL)
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return ENC_ISO_LATIN1;
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sz = strlen(s);
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if (sz >= 5) {
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if (s[sz-5] == 'U' &&
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s[sz-4] == 'T' &&
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s[sz-3] == 'F' &&
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s[sz-2] == '-' &&
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s[sz-1] == '8') {
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return ENC_ISO_UTF8;
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}
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}
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return ENC_ISO_ANSI;
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}
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static Int
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get_default_encoding( USES_REGS1 )
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{
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Term out = MkIntegerTerm(Yap_DefaultEncoding());
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return Yap_unify(ARG1, out);
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}
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static Int
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p_encoding ( USES_REGS1 )
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{ /* '$encoding'(Stream,N) */
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int sno = Yap_CheckStream (ARG1, Input_Stream_f|Output_Stream_f, "encoding/2");
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Term t = Deref(ARG2);
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if (sno < 0)
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return FALSE;
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if (IsVarTerm(t)) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify(ARG2, MkIntegerTerm(GLOBAL_Stream[sno].encoding));
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}
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GLOBAL_Stream[sno].encoding = IntegerOfTerm(Deref(ARG2));
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return TRUE;
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}
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static Int
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toupper2( USES_REGS1 )
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{
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Int out = IntegerOfTerm(Deref(ARG1)), uout;
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if (out < 0) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "toupper");
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return FALSE;
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}
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if (out < 128)
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uout = toupper(out);
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else
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uout = towupper(out);
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return Yap_unify(ARG2, MkIntegerTerm(uout));
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}
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static Int
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tolower2( USES_REGS1 )
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{
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Int out = IntegerOfTerm(Deref(ARG1)), uout;
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if (out < 0) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "tolower");
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return FALSE;
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}
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if (out < 128)
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uout = tolower(out);
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else
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uout = towlower(out);
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return Yap_unify(ARG2, MkIntegerTerm(uout));
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}
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static Int
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p_change_type_of_char ( USES_REGS1 )
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{ /* change_type_of_char(+char,+type) */
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Term t1 = Deref (ARG1);
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Term t2 = Deref (ARG2);
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if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
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return FALSE;
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if (!IsVarTerm(t2) && !IsIntegerTerm(t2))
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return FALSE;
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Yap_chtype[IntegerOfTerm(t1)] = IntegerOfTerm(t2);
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return TRUE;
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}
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static Int
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p_type_of_char ( USES_REGS1 )
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{ /* type_of_char(+char,-type) */
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Term t;
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Term t1 = Deref (ARG1);
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if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
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return FALSE;
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t = MkIntTerm(Yap_chtype[IntegerOfTerm (t1)]);
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return Yap_unify(t,ARG2);
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}
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/* I dispise this code!!!!! */
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int
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ISOWGetc (int sno)
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{
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int ch = GLOBAL_Stream[sno].stream_wgetc(sno);
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if (ch != EOF && GLOBAL_CharConversionTable != NULL) {
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if (ch < NUMBER_OF_CHARS) {
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/* only do this in ASCII */
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return GLOBAL_CharConversionTable[ch];
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}
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}
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return ch;
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}
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static Int
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p_force_char_conversion( USES_REGS1 )
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{
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int i;
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/* don't actually enable it until someone tries to add a conversion */
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if (GLOBAL_CharConversionTable2 == NULL)
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return(TRUE);
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for (i = 0; i < MaxStreams; i++) {
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if (!(GLOBAL_Stream[i].status & Free_Stream_f))
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GLOBAL_Stream[i].stream_wgetc_for_read = ISOWGetc;
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}
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GLOBAL_CharConversionTable = GLOBAL_CharConversionTable2;
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return(TRUE);
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}
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static Int
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p_disable_char_conversion( USES_REGS1 )
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{
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int i;
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for (i = 0; i < MaxStreams; i++) {
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if (!(GLOBAL_Stream[i].status & Free_Stream_f))
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GLOBAL_Stream[i].stream_wgetc_for_read = GLOBAL_Stream[i].stream_wgetc;
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}
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GLOBAL_CharConversionTable = NULL;
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return(TRUE);
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}
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static Int
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char_conversion( USES_REGS1 )
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{
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Term t0 = Deref(ARG1), t1 = Deref(ARG2);
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char *s0, *s1;
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if (IsVarTerm(t0)) {
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Yap_Error(INSTANTIATION_ERROR, t0, "char_conversion/2");
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return (FALSE);
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}
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if (!IsAtomTerm(t0)) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
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return (FALSE);
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}
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s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
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if (s0[1] != '\0') {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
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return (FALSE);
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}
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if (IsVarTerm(t1)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "char_conversion/2");
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return (FALSE);
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}
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if (!IsAtomTerm(t1)) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
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return (FALSE);
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}
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s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
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if (s1[1] != '\0') {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
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return (FALSE);
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}
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/* check if we do have a table for converting characters */
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if (GLOBAL_CharConversionTable2 == NULL) {
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int i;
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/* don't create a table if we don't need to */
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if (s0[0] == s1[0])
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return(TRUE);
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GLOBAL_CharConversionTable2 = Yap_AllocCodeSpace(NUMBER_OF_CHARS*sizeof(char));
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while (GLOBAL_CharConversionTable2 == NULL) {
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if (!Yap_growheap(FALSE, NUMBER_OF_CHARS*sizeof(char), NULL)) {
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Yap_Error(OUT_OF_HEAP_ERROR, TermNil, LOCAL_ErrorMessage);
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return(FALSE);
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}
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}
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if (trueGlobalPrologFlag(CHAR_CONVERSION_FLAG)) {
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CACHE_REGS
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if (p_force_char_conversion(PASS_REGS1) == FALSE)
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return(FALSE);
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}
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for (i = 0; i < NUMBER_OF_CHARS; i++)
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GLOBAL_CharConversionTable2[i] = i;
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}
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/* just add the new entry */
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GLOBAL_CharConversionTable2[(int)s0[0]] = s1[0];
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/* done */
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return(TRUE);
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}
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static Int
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p_current_char_conversion( USES_REGS1 )
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{
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Term t0, t1;
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char *s0, *s1;
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if (GLOBAL_CharConversionTable == NULL) {
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return(FALSE);
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}
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t0 = Deref(ARG1);
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if (IsVarTerm(t0)) {
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Yap_Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2");
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return (FALSE);
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}
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if (!IsAtomTerm(t0)) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
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return (FALSE);
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}
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s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
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if (s0[1] != '\0') {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
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return (FALSE);
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}
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t1 = Deref(ARG2);
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if (IsVarTerm(t1)) {
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char out[2];
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if (GLOBAL_CharConversionTable[(int)s0[0]] == '\0') return(FALSE);
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out[0] = GLOBAL_CharConversionTable[(int)s0[0]];
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out[1] = '\0';
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return(Yap_unify(ARG2,MkAtomTerm(Yap_LookupAtom(out))));
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}
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if (!IsAtomTerm(t1)) {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
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return (FALSE);
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}
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s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
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if (s1[1] != '\0') {
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Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
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return (FALSE);
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} else {
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return (GLOBAL_CharConversionTable[(int)s0[0]] == '\0' &&
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GLOBAL_CharConversionTable[(int)s0[0]] == s1[0] );
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}
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}
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static Int
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p_all_char_conversions( USES_REGS1 )
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{
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Term out = TermNil;
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int i;
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if (GLOBAL_CharConversionTable == NULL) {
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return(FALSE);
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}
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for (i = NUMBER_OF_CHARS; i > 0; ) {
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i--;
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if (GLOBAL_CharConversionTable[i] != '\0') {
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Term t1, t2;
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char s[2];
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s[1] = '\0';
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s[0] = GLOBAL_CharConversionTable[i];
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t1 = MkAtomTerm(Yap_LookupAtom(s));
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out = MkPairTerm(t1,out);
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s[0] = i;
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t2 = MkAtomTerm(Yap_LookupAtom(s));
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out = MkPairTerm(t2,out);
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}
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}
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return(Yap_unify(ARG1,out));
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}
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void
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Yap_InitChtypes(void)
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{
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DefaultEncoding();
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Yap_InitCPred ("$change_type_of_char", 2, p_change_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("$type_of_char", 2, p_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("toupper", 2, toupper2, SafePredFlag);
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Yap_InitCPred ("tolower", 2, tolower2, SafePredFlag);
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Yap_InitCPred ("char_conversion", 2, char_conversion, SyncPredFlag);
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Yap_InitCPred ("$get_default_encoding", 1, get_default_encoding, SafePredFlag|HiddenPredFlag);
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Yap_InitCPred ("$encoding", 2, p_encoding, SafePredFlag|SyncPredFlag),
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Yap_InitCPred ("$current_char_conversion", 2, p_current_char_conversion, SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("$all_char_conversions", 1, p_all_char_conversions, SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("$force_char_conversion", 0, p_force_char_conversion, SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("$disable_char_conversion", 0, p_disable_char_conversion, SyncPredFlag|HiddenPredFlag);
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}
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