This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/os/chartypes.c
Vítor Santos Costa 699dcfe6eb fix deadlock
2015-10-08 10:19:17 +01:00

424 lines
11 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: charcodes.c *
* Last rev: 5/2/88 *
* mods: *
* comments: Character codes and character conversion *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
/*
* This file includes the definition of a pipe related IO.
*
*/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#ifdef _WIN32
#if HAVE_IO_H
/* Windows */
#include <io.h>
#endif
#if HAVE_SOCKET
#include <winsock2.h>
#endif
#include <windows.h>
#ifndef S_ISDIR
#define S_ISDIR(x) (((x)&_S_IFDIR) == _S_IFDIR)
#endif
#endif
#include "iopreds.h"
#include "eval.h"
static Int p_change_type_of_char(USES_REGS1);
static Int p_type_of_char(USES_REGS1);
Term Yap_StringToNumberTerm(char *s, encoding_t *encp) {
CACHE_REGS
int sno;
Term t;
sno = Yap_open_buf_read_stream(s, strlen(s), encp, MEM_BUF_USER);
if (sno < 0)
return FALSE;
if (encp)
GLOBAL_Stream[sno].encoding = *encp;
else
GLOBAL_Stream[sno].encoding = LOCAL_encoding;
while (*s && isblank(*s++))
;
t = Yap_scan_num(GLOBAL_Stream + sno);
if (t == TermNil) {
CACHE_REGS
int sign = 1;
if (s[0] == '+') {
s++;
}
if (s[0] == '-') {
s++;
sign = -1;
}
if (strcmp(s, "inf") == 0) {
if (sign > 0) {
return MkFloatTerm(INFINITY);
} else {
return MkFloatTerm(-INFINITY);
}
}
if (strcmp(s, "nan") == 0) {
if (sign > 0) {
return MkFloatTerm(NAN);
} else {
return MkFloatTerm(-NAN);
}
}
}
Yap_CloseStream(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return t;
}
const char *encvs[] = {"LANG", "LC_ALL", "LC_CTYPE", NULL};
// wher we can fins an encoding
typedef struct enc_map {
const char *s;
encoding_t e;
} enc_map_t;
static enc_map_t ematches[] = {
{"UTF-8", ENC_ISO_UTF8},
{"UTF-16", ENC_UTF16_LE}, // ok, this is a very bad name
{"UCS-2", ENC_UTF16_LE}, // ok, this is probably gone by now
{"ISO-LATIN1", ENC_ISO_LATIN1},
{"ISO-8859-1", ENC_ISO_LATIN1},
{"Windows-1252", ENC_ISO_LATIN1}, // almost, but not quite
{"CP-1252", ENC_ISO_LATIN1},
{"C", ENC_ISO_ASCII},
{NULL, ENC_OCTET}};
static encoding_t DefaultEncoding(void) {
encoding_t rc;
int i = 0, j;
char *enc;
while (encvs[i]) {
char *v = getenv(encvs[i]);
if (v) {
enc = strrchr(v, '.');
/* that's how it is supposed to be, except in OSX */
if (!enc)
enc = v;
else
enc++;
// now that we have one name, try to match it
j = 0;
while (ematches[j].s) {
if (!strcmp(ematches[j].s, enc))
return ematches[j].e;
}
}
i++;
}
// by default, return UTF-8
// except in _WIN32
#ifdef _WIN32
rc = ENC_UTF16_BE;
#else
rc = ENC_ISO_UTF8;
#endif
{
int j = 0;
while (rc != ematches[j].e)
j++;
Yap_Warning("YAP will use default encoding %s", ematches[j].s);
}
return rc;
}
encoding_t Yap_DefaultEncoding(void) {
CACHE_REGS
return LOCAL_encoding;
}
void Yap_SetDefaultEncoding(encoding_t new_encoding) {
CACHE_REGS
LOCAL_encoding = new_encoding;
}
static Int get_default_encoding(USES_REGS1) {
Term out = MkIntegerTerm(Yap_DefaultEncoding());
return Yap_unify(ARG1, out);
}
static Int p_encoding(USES_REGS1) { /* '$encoding'(Stream,N) */
int sno =
Yap_CheckStream(ARG1, Input_Stream_f | Output_Stream_f, "encoding/2");
Term t = Deref(ARG2);
if (sno < 0)
return FALSE;
if (IsVarTerm(t)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
return Yap_unify(ARG2, MkIntegerTerm(GLOBAL_Stream[sno].encoding));
}
GLOBAL_Stream[sno].encoding = IntegerOfTerm(Deref(ARG2));
UNLOCK(GLOBAL_Stream[sno].streamlock);
return TRUE;
}
static Int toupper2(USES_REGS1) {
Int out = IntegerOfTerm(Deref(ARG1)), uout;
if (out < 0) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "toupper");
return FALSE;
}
if (out < 128)
uout = toupper(out);
else
uout = towupper(out);
return Yap_unify(ARG2, MkIntegerTerm(uout));
}
static Int tolower2(USES_REGS1) {
Int out = IntegerOfTerm(Deref(ARG1)), uout;
if (out < 0) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER_CODE, ARG1, "tolower");
return FALSE;
}
if (out < 128)
uout = tolower(out);
else
uout = towlower(out);
return Yap_unify(ARG2, MkIntegerTerm(uout));
}
static Int
p_change_type_of_char(USES_REGS1) { /* change_type_of_char(+char,+type) */
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
if (!IsVarTerm(t1) && !IsIntegerTerm(t1))
return FALSE;
if (!IsVarTerm(t2) && !IsIntegerTerm(t2))
return FALSE;
Yap_chtype[IntegerOfTerm(t1)] = IntegerOfTerm(t2);
return TRUE;
}
static Int p_type_of_char(USES_REGS1) { /* type_of_char(+char,-type) */
Term t;
Term t1 = Deref(ARG1);
if (!IsVarTerm(t1) && !IsIntegerTerm(t1))
return FALSE;
t = MkIntTerm(Yap_chtype[IntegerOfTerm(t1)]);
return Yap_unify(t, ARG2);
}
int ISOWGetc(int sno) {
int ch = GLOBAL_Stream[sno].stream_wgetc(sno);
if (ch != EOF && GLOBAL_CharConversionTable != NULL) {
if (ch < NUMBER_OF_CHARS) {
/* only do this in ASCII */
return GLOBAL_CharConversionTable[ch];
}
}
return ch;
}
static Int p_force_char_conversion(USES_REGS1) {
int i;
/* don't actually enable it until someone tries to add a conversion */
if (GLOBAL_CharConversionTable2 == NULL)
return (TRUE);
for (i = 0; i < MaxStreams; i++) {
if (!(GLOBAL_Stream[i].status & Free_Stream_f))
GLOBAL_Stream[i].stream_wgetc_for_read = ISOWGetc;
}
GLOBAL_CharConversionTable = GLOBAL_CharConversionTable2;
return (TRUE);
}
static Int p_disable_char_conversion(USES_REGS1) {
int i;
for (i = 0; i < MaxStreams; i++) {
if (!(GLOBAL_Stream[i].status & Free_Stream_f))
GLOBAL_Stream[i].stream_wgetc_for_read = GLOBAL_Stream[i].stream_wgetc;
}
GLOBAL_CharConversionTable = NULL;
return (TRUE);
}
static Int char_conversion(USES_REGS1) {
Term t0 = Deref(ARG1), t1 = Deref(ARG2);
unsigned char *s0, *s1;
if (IsVarTerm(t0)) {
Yap_Error(INSTANTIATION_ERROR, t0, "char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t0)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
return (FALSE);
}
s0 = RepAtom(AtomOfTerm(t0))->UStrOfAE;
if (s0[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
return (FALSE);
}
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t1)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
return (FALSE);
}
s1 = RepAtom(AtomOfTerm(t1))->UStrOfAE;
if (s1[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
return (FALSE);
}
/* check if we do have a table for converting characters */
if (GLOBAL_CharConversionTable2 == NULL) {
int i;
/* don't create a table if we don't need to */
if (s0[0] == s1[0])
return (TRUE);
GLOBAL_CharConversionTable2 =
Yap_AllocCodeSpace(NUMBER_OF_CHARS * sizeof(char));
while (GLOBAL_CharConversionTable2 == NULL) {
if (!Yap_growheap(FALSE, NUMBER_OF_CHARS * sizeof(char), NULL)) {
Yap_Error(RESOURCE_ERROR_HEAP, TermNil, LOCAL_ErrorMessage);
return (FALSE);
}
}
if (trueGlobalPrologFlag(CHAR_CONVERSION_FLAG)) {
CACHE_REGS
if (p_force_char_conversion(PASS_REGS1) == FALSE)
return (FALSE);
}
for (i = 0; i < NUMBER_OF_CHARS; i++)
GLOBAL_CharConversionTable2[i] = i;
}
/* just add the new entry */
GLOBAL_CharConversionTable2[(int)s0[0]] = s1[0];
/* done */
return (TRUE);
}
static Int p_current_char_conversion(USES_REGS1) {
Term t0, t1;
unsigned char *s0, *s1;
if (GLOBAL_CharConversionTable == NULL) {
return (FALSE);
}
t0 = Deref(ARG1);
if (IsVarTerm(t0)) {
Yap_Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t0)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
return (FALSE);
}
s0 = RepAtom(AtomOfTerm(t0))->UStrOfAE;
if (s0[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
return (FALSE);
}
t1 = Deref(ARG2);
if (IsVarTerm(t1)) {
char out[2];
if (GLOBAL_CharConversionTable[(int)s0[0]] == '\0')
return (FALSE);
out[0] = GLOBAL_CharConversionTable[(int)s0[0]];
out[1] = '\0';
return (Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(out))));
}
if (!IsAtomTerm(t1)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
return (FALSE);
}
s1 = RepAtom(AtomOfTerm(t1))->UStrOfAE;
if (s1[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
return (FALSE);
} else {
return (GLOBAL_CharConversionTable[(int)s0[0]] == '\0' &&
GLOBAL_CharConversionTable[(int)s0[0]] == s1[0]);
}
}
static Int p_all_char_conversions(USES_REGS1) {
Term out = TermNil;
int i;
if (GLOBAL_CharConversionTable == NULL) {
return (FALSE);
}
for (i = NUMBER_OF_CHARS; i > 0;) {
i--;
if (GLOBAL_CharConversionTable[i] != '\0') {
Term t1, t2;
char s[2];
s[1] = '\0';
s[0] = GLOBAL_CharConversionTable[i];
t1 = MkAtomTerm(Yap_LookupAtom(s));
out = MkPairTerm(t1, out);
s[0] = i;
t2 = MkAtomTerm(Yap_LookupAtom(s));
out = MkPairTerm(t2, out);
}
}
return (Yap_unify(ARG1, out));
}
void Yap_InitChtypes(void) {
DefaultEncoding();
Yap_InitCPred("$change_type_of_char", 2, p_change_type_of_char,
SafePredFlag | SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("$type_of_char", 2, p_type_of_char,
SafePredFlag | SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("toupper", 2, toupper2, SafePredFlag);
Yap_InitCPred("tolower", 2, tolower2, SafePredFlag);
Yap_InitCPred("char_conversion", 2, char_conversion, SyncPredFlag);
Yap_InitCPred("$get_default_encoding", 1, get_default_encoding,
SafePredFlag | HiddenPredFlag);
Yap_InitCPred("$encoding", 2, p_encoding, SafePredFlag | SyncPredFlag),
Yap_InitCPred("$current_char_conversion", 2, p_current_char_conversion,
SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("$all_char_conversions", 1, p_all_char_conversions,
SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("$force_char_conversion", 0, p_force_char_conversion,
SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("$disable_char_conversion", 0, p_disable_char_conversion,
SyncPredFlag | HiddenPredFlag);
}