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yap-6.3/os/pl-locale.c

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2013-11-15 01:10:25 +00:00
/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2013, VU University 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
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "pl-incl.h"
#include "pl-locale.h"
#if defined(__sun) || __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070
#undef HAVE_WCSDUP /* No prototype, so better use our own */
#endif
#ifdef O_LOCALE
#include <locale.h>
#define LOCK() PL_LOCK(L_LOCALE) /* MT locking */
#define UNLOCK() PL_UNLOCK(L_LOCALE)
#undef LD /* fetch LD once per function */
#define LD LOCAL_LD
#define LSTR_MAX 16
#ifndef HAVE_LOCALECONV
typedef struct
{ char *decimal_point;
char *thousands_sep;
char *grouping;
} lconv;
struct lconv *
localeconv(void)
{ static struct lconv defl =
{ ".",
",",
"\003\003"
};
return &defl;
}
#endif
#ifndef HAVE_WCSDUP
static wchar_t *
my_wcsdup(const wchar_t *in)
{ wchar_t *copy = malloc((wcslen(in)+1)*sizeof(wchar_t));
if ( copy )
return wcscpy(copy, in);
return NULL;
}
#define wcsdup(ws) my_wcsdup(ws)
#endif
static wchar_t *
ls_to_wcs(const char *in, const wchar_t *on_error)
{ wchar_t buf[LSTR_MAX];
mbstate_t state;
memset(&state, 0, sizeof(state));
mbsrtowcs(buf, &in, LSTR_MAX, &state);
if ( in == NULL )
{ return wcsdup(buf);
} else
{ Sdprintf("Illegal locale string: %s\n", in);
return wcsdup(on_error);
}
}
static int
init_locale_strings(PL_locale *l, struct lconv *conv)
{ if ( conv )
{ l->decimal_point = ls_to_wcs(conv->decimal_point, L".");
l->thousands_sep = ls_to_wcs(conv->thousands_sep, L",");
l->grouping = strdup(conv->grouping);
return TRUE;
} else
{ l->decimal_point = wcsdup(L".");
l->thousands_sep = wcsdup(L",");
l->grouping = strdup("\003");
return FALSE;
}
}
static PL_locale *
new_locale(PL_locale *proto)
{ PL_locale *new = PL_malloc(sizeof(*new));
if ( new )
{ memset(new, 0, sizeof(*new));
new->magic = LOCALE_MAGIC;
if ( proto )
{ new->decimal_point = wcsdup(proto->decimal_point);
new->thousands_sep = wcsdup(proto->thousands_sep);
new->grouping = strdup(proto->grouping);
} else
{ init_locale_strings(new, localeconv());
}
}
return new;
}
static void
free_locale_strings(PL_locale *l)
{ free(l->decimal_point);
free(l->thousands_sep);
free(l->grouping);
}
static void
free_locale(PL_locale *l)
{ if ( l )
{ free_locale_strings(l);
if ( l->alias )
PL_unregister_atom(l->alias);
PL_free(l);
}
}
static void
update_locale(PL_locale *l, int category, const char *locale)
{ free_locale_strings(l);
init_locale_strings(l, localeconv());
}
static int
alias_locale(PL_locale *l, atom_t alias)
{ int rc;
LOCK();
if ( !GD->locale.localeTable )
GD->locale.localeTable = newHTable(16);
if ( addHTable(GD->locale.localeTable, (void*)alias, l) )
{ l->alias = alias;
PL_register_atom(alias);
rc = TRUE;
} else
{ GET_LD
term_t obj = PL_new_term_ref();
PL_put_atom(obj, alias);
rc = PL_error("locale_create", 2, "Alias name already taken",
ERR_PERMISSION, ATOM_create, ATOM_locale, obj);
}
UNLOCK();
return rc;
}
/*******************************
* LOCALE BLOB *
*******************************/
typedef struct locale_ref
{ PL_locale *data;
} locale_ref;
static int
write_locale_ref(IOSTREAM *s, atom_t aref, int flags)
{ locale_ref *ref = PL_blob_data(aref, NULL, NULL);
(void)flags;
Sfprintf(s, "<locale>(%p)", ref->data);
return TRUE;
}
static void
acquire_locale_ref(atom_t aref)
{ locale_ref *ref = PL_blob_data(aref, NULL, NULL);
(void)ref;
}
static int
release_locale_ref(atom_t aref)
{ locale_ref *ref = PL_blob_data(aref, NULL, NULL);
LOCK();
if ( ref->data->references == 0 )
free_locale(ref->data);
else
ref->data->symbol = 0;
UNLOCK();
return TRUE;
}
static int
save_locale_ref(atom_t aref, IOSTREAM *fd)
{ locale_ref *ref = PL_blob_data(aref, NULL, NULL);
(void)fd;
return PL_warning("Cannot save reference to <locale>(%p)", ref->data);
}
static atom_t
load_locale_ref(IOSTREAM *fd)
{ (void)fd;
return PL_new_atom("<saved-locale-ref>");
}
static PL_blob_t locale_blob =
{ PL_BLOB_MAGIC,
PL_BLOB_UNIQUE,
"locale",
release_locale_ref,
NULL,
write_locale_ref,
acquire_locale_ref,
save_locale_ref,
load_locale_ref
};
/*******************************
* PROLOG HANDLE *
*******************************/
int
unifyLocale(term_t t, PL_locale *l, int alias)
{ GET_LD
term_t b;
if ( l->alias && alias )
return PL_unify_atom(t, l->alias);
if ( l->symbol )
return PL_unify_atom(t, l->symbol);
if ( (b=PL_new_term_ref()) &&
PL_put_blob(b, &l, sizeof(l), &locale_blob) )
{ PL_get_atom(b, &l->symbol);
assert(l->symbol);
return PL_unify(t, b);
}
return FALSE;
}
int
getLocale(term_t t, PL_locale **lp)
{ GET_LD
atom_t a;
if ( PL_get_atom(t, &a) )
{ PL_locale *l = NULL;
PL_blob_t *bt;
locale_ref *ref;
if ( a == ATOM_current_locale )
{ GET_LD
l = LD->locale.current;
} else if ( (ref=PL_blob_data(a, NULL, &bt)) && bt == &locale_blob )
{ l = ref->data;
} else if ( GD->locale.localeTable )
{ Symbol s;
if ( (s=lookupHTable(GD->locale.localeTable, (void*)a)) )
l = s->value;
}
if ( l )
{ assert(l->magic == LOCALE_MAGIC);
*lp = acquireLocale(l);
return TRUE;
}
}
return FALSE;
}
int
getLocaleEx(term_t t, PL_locale **lp)
{ GET_LD
if ( getLocale(t, lp) )
return TRUE;
if ( PL_is_atom(t) )
return PL_existence_error("locale", t);
else
return PL_type_error("locale", t);
}
/*******************************
* PROLOG BINDING *
*******************************/
static int /* locale_property(Mutex, alias(Name)) */
locale_alias_property(PL_locale *l, term_t prop ARG_LD)
{ if ( l->alias )
return PL_unify_atom(prop, l->alias);
return FALSE;
}
static int /* locale_property(Locale, decimal_point(Atom)) */
locale_decimal_point_property(PL_locale *l, term_t prop ARG_LD)
{ if ( l->decimal_point && l->decimal_point[0] )
return PL_unify_wchars(prop, PL_ATOM, (size_t)-1, l->decimal_point);
return FALSE;
}
static int /* locale_property(Locale, thousands_sep(Atom)) */
locale_thousands_sep_property(PL_locale *l, term_t prop ARG_LD)
{ if ( l->thousands_sep && l->thousands_sep[0] )
return PL_unify_wchars(prop, PL_ATOM, (size_t)-1, l->thousands_sep);
return FALSE;
}
static int /* locale_property(Locale, grouping(List)) */
locale_grouping_property(PL_locale *l, term_t prop ARG_LD)
{ if ( l->grouping && l->grouping[0] )
{ term_t tail = PL_copy_term_ref(prop);
term_t head = PL_new_term_ref();
char *s;
for(s=l->grouping; ; s++)
{ if ( !PL_unify_list(tail, head, tail) )
return FALSE;
if ( s[1] == 0 || (s[1] == s[0] && s[2] == 0) )
return ( PL_unify_term(head, PL_FUNCTOR, FUNCTOR_repeat1,
PL_INT, (int)s[0]) &&
PL_unify_nil(tail)
);
if ( s[0] == CHAR_MAX )
return PL_unify_nil(tail);
if ( !PL_unify_integer(head, s[0]) )
return FALSE;
}
}
return FALSE;
}
typedef struct
{ functor_t functor; /* functor of property */
int (*function)(); /* function to generate */
} lprop;
static const lprop lprop_list [] =
{ { FUNCTOR_alias1, locale_alias_property },
{ FUNCTOR_decimal_point1, locale_decimal_point_property },
{ FUNCTOR_thousands_sep1, locale_thousands_sep_property },
{ FUNCTOR_grouping1, locale_grouping_property },
{ 0, NULL }
};
typedef struct
{ TableEnum e; /* Enumerator on mutex-table */
PL_locale *l; /* current locale */
const lprop *p; /* Pointer in properties */
int enum_properties; /* Enumerate the properties */
} lprop_enum;
static int
get_prop_def(term_t t, atom_t expected, const lprop *list, const lprop **def)
{ GET_LD
functor_t f;
if ( PL_get_functor(t, &f) )
{ const lprop *p = list;
for( ; p->functor; p++ )
{ if ( f == p->functor )
{ *def = p;
return TRUE;
}
}
PL_error(NULL, 0, NULL, ERR_DOMAIN, expected, t);
return -1;
}
if ( PL_is_variable(t) )
return 0;
PL_error(NULL, 0, NULL, ERR_TYPE, expected, t);
return -1;
}
static int
advance_lstate(lprop_enum *state)
{ if ( state->enum_properties )
{ state->p++;
if ( state->p->functor )
return TRUE;
state->p = lprop_list;
}
if ( state->e )
{ Symbol s;
if ( (s = advanceTableEnum(state->e)) )
{ state->l = s->value;
return TRUE;
}
}
return FALSE;
}
static void
free_lstate(lprop_enum *state)
{ if ( state->e )
freeTableEnum(state->e);
else if ( state->l )
releaseLocale(state->l);
freeForeignState(state, sizeof(*state));
}
static int
get_atom_arg(term_t t, atom_t *a)
{ GET_LD
term_t t2 = PL_new_term_ref();
return PL_get_arg(1, t, t2) && PL_get_atom(t2, a);
}
/** locale_property(?Locale, ?Property) is nondet.
*/
static
PRED_IMPL("locale_property", 2, locale_property, PL_FA_NONDETERMINISTIC)
{ PRED_LD
term_t locale = A1;
term_t property = A2;
lprop_enum statebuf;
lprop_enum *state;
switch( CTX_CNTRL )
{ case FRG_FIRST_CALL:
{ memset(&statebuf, 0, sizeof(statebuf));
state = &statebuf;
if ( PL_is_variable(locale) )
{ switch( get_prop_def(property, ATOM_locale_property,
lprop_list, &state->p) )
{ case 1:
{ atom_t alias;
if ( state->p->functor == FUNCTOR_alias1 &&
get_atom_arg(property, &alias) )
{ Symbol s;
if ( (s=lookupHTable(GD->locale.localeTable, (void*)alias)) )
return unifyLocale(locale, s->value, FALSE);
else
return FALSE;
}
state->e = newTableEnum(GD->locale.localeTable);
goto enumerate;
}
case 0:
state->e = newTableEnum(GD->locale.localeTable);
state->p = lprop_list;
state->enum_properties = TRUE;
goto enumerate;
case -1:
return FALSE;
}
} else if ( getLocale(locale, &state->l) )
{ switch( get_prop_def(property, ATOM_locale_property,
lprop_list, &state->p) )
{ case 1:
goto enumerate;
case 0:
state->p = lprop_list;
state->enum_properties = TRUE;
goto enumerate;
case -1:
return FALSE;
}
} else
{ return FALSE;
}
}
case FRG_REDO:
state = CTX_PTR;
break;
case FRG_CUTTED:
state = CTX_PTR;
free_lstate(state);
succeed;
default:
assert(0);
}
enumerate:
if ( !state->l ) /* first time, enumerating locales */
{ Symbol s;
assert(state->e);
if ( (s=advanceTableEnum(state->e)) )
{ state->l = s->value;
} else
{ freeTableEnum(state->e);
assert(state != &statebuf);
return FALSE;
}
}
{ term_t arg = PL_new_term_ref();
if ( !state->enum_properties )
_PL_get_arg(1, property, arg);
for(;;)
{ if ( (*state->p->function)(state->l, arg PASS_LD) )
{ if ( state->enum_properties )
{ if ( !PL_unify_term(property,
PL_FUNCTOR, state->p->functor,
PL_TERM, arg) )
goto error;
}
if ( state->e )
{ if ( !unifyLocale(locale, state->l, TRUE) )
goto error;
}
if ( advance_lstate(state) )
{ if ( state == &statebuf )
{ lprop_enum *copy = allocForeignState(sizeof(*copy));
*copy = *state;
state = copy;
}
ForeignRedoPtr(state);
}
if ( state != &statebuf )
free_lstate(state);
return TRUE;
}
if ( !advance_lstate(state) )
{ error:
if ( state != &statebuf )
free_lstate(state);
return FALSE;
}
}
}
}
static int
set_chars(term_t t, wchar_t **valp)
{ wchar_t *s;
if ( PL_get_wchars(t, NULL, &s, CVT_ATOM|CVT_EXCEPTION) )
{ free(*valp);
if ( (*valp = wcsdup(s)) )
return TRUE;
return PL_no_memory();
}
return FALSE;
}
#define MAX_GROUPING 10
static int
get_group_size_ex(term_t t, int *s)
{ int i;
if ( PL_get_integer_ex(t, &i) )
{ if ( i > 0 && i < CHAR_MAX )
{ *s = i;
return TRUE;
}
return PL_domain_error("digit_group_size", t);
}
return FALSE;
}
static int
set_grouping(term_t t, char **valp)
{ GET_LD
char s[MAX_GROUPING];
term_t tail = PL_copy_term_ref(t);
term_t head = PL_new_term_ref();
char *o = s;
while(PL_get_list_ex(tail, head, tail))
{ int g;
if ( o-s+2 >= MAX_GROUPING )
return PL_representation_error("digit_groups");
if ( PL_is_functor(head, FUNCTOR_repeat1) )
{ if ( !PL_get_nil_ex(tail) )
return FALSE;
_PL_get_arg(1, head, head);
if ( get_group_size_ex(head, &g) )
{ *o++ = g;
goto end;
}
return FALSE;
}
if ( get_group_size_ex(head, &g) )
{ *o++ = g;
} else
return FALSE;
}
if ( PL_get_nil_ex(tail) )
{ *o++ = CHAR_MAX; /* no more grouping */
end:
*o++ = '\0';
free(*valp);
if ( (*valp = strdup(s)) )
return TRUE;
return PL_no_memory();
}
return FALSE;
}
/** locale_create(-Locale, +Default, +Options) is det.
*/
static
PRED_IMPL("locale_create", 3, locale_create, 0)
{ PRED_LD
PL_locale *def, *new;
char *lname;
if ( PL_get_chars(A2, &lname, CVT_LIST|CVT_STRING|REP_MB) )
{ const char *old;
LOCK();
if ( (old=setlocale(LC_NUMERIC, lname)) )
{ new = new_locale(NULL);
setlocale(LC_NUMERIC, old);
} else
{ assert(0); /* keep compiler happy */
return FALSE;
}
UNLOCK();
if ( !old )
{ if ( errno == ENOENT )
return PL_existence_error("locale", A2);
else
return PL_error(NULL, 0, MSG_ERRNO, ERR_SYSCALL, "setlocale");
}
} else
{ if ( !getLocaleEx(A2, &def) )
return FALSE;
new = new_locale(def);
releaseLocale(def);
}
if ( new )
{ atom_t alias = 0;
term_t tail = PL_copy_term_ref(A3);
term_t head = PL_new_term_ref();
term_t arg = PL_new_term_ref();
while(PL_get_list_ex(tail, head, tail))
{ atom_t pname;
int parity;
if ( !PL_get_name_arity(head, &pname, &parity) ||
parity != 1 ||
!PL_get_arg(1, head, arg) )
{ PL_type_error("locale_property", head);
goto error;
}
if ( pname == ATOM_alias )
{ if ( !PL_get_atom_ex(arg, &alias) )
goto error;
} else if ( pname == ATOM_decimal_point )
{ if ( !set_chars(arg, &new->decimal_point) )
goto error;
} else if ( pname == ATOM_thousands_sep )
{ if ( !set_chars(arg, &new->thousands_sep) )
goto error;
} else if ( pname == ATOM_grouping )
{ if ( !set_grouping(arg, &new->grouping) )
goto error;
}
}
if ( !PL_get_nil_ex(tail) )
{
error:
free_locale(new);
return FALSE;
}
if ( alias && !alias_locale(new, alias) )
goto error;
return unifyLocale(A1, new, TRUE);
} else
{ return PL_no_memory();
}
}
static
PRED_IMPL("locale_destroy", 1, locale_destroy, 0)
{ PL_locale *l;
if ( getLocaleEx(A1, &l) )
{ if ( l->alias )
{ Symbol s;
atom_t alias = l->alias;
LOCK();
if ( (s=lookupHTable(GD->locale.localeTable, (void*)alias)) )
deleteSymbolHTable(GD->locale.localeTable, s);
l->alias = 0;
PL_unregister_atom(alias);
UNLOCK();
}
releaseLocale(l);
return TRUE;
}
return FALSE;
}
/** set_locale(+Locale) is det.
*/
static
PRED_IMPL("set_locale", 1, set_locale, 0)
{ PRED_LD
PL_locale *l;
if ( getLocaleEx(A1, &l) )
{ PL_locale *ol = LD->locale.current;
if ( l != ol )
{ IOSTREAM **sp;
LD->locale.current = l; /* already acquired */
if ( ol )
releaseLocale(ol);
if ( (sp=_PL_streams()) ) /* set locale of standard streams */
{ int i;
for(i=0; i<5; i++)
Ssetlocale(sp[i], l, NULL);
}
}
return TRUE;
}
return FALSE;
}
/** current_locale(-Locale) is det.
*/
static
PRED_IMPL("current_locale", 1, current_locale, 0)
{ PRED_LD
if ( LD->locale.current )
return unifyLocale(A1, LD->locale.current, TRUE);
return FALSE;
}
/*******************************
* C INTERFACE *
*******************************/
static void
initDefaultsStreamsLocale(PL_locale *l)
{ IOSTREAM *s = S__getiob();
int i;
for(i=0; i<2; i++, s++)
{ if ( !s->locale )
s->locale = acquireLocale(l);
}
}
void
initLocale(void)
{ GET_LD
PL_locale *def;
if ( !setlocale(LC_NUMERIC, "") )
{ DEBUG(0, Sdprintf("Failed to set LC_NUMERIC locale\n"));
}
if ( (def = new_locale(NULL)) )
{ alias_locale(def, ATOM_default);
def->references++;
GD->locale.default_locale = def;
LD->locale.current = acquireLocale(def);
initDefaultsStreamsLocale(def);
}
}
void
updateLocale(int category, const char *locale)
{ update_locale(GD->locale.default_locale, category, locale);
}
int
initStreamLocale(IOSTREAM *s)
{ GET_LD
PL_locale *l;
if ( LD ) /* a Prolog thread */
l = LD->locale.current;
else
l = GD->locale.default_locale;
if ( l )
s->locale = acquireLocale(l);
return TRUE;
}
PL_locale *
acquireLocale(PL_locale *l)
{ LOCK();
l->references++;
UNLOCK();
return l;
}
void
releaseLocale(PL_locale *l)
{ LOCK();
if ( --l->references == 0 && l->symbol == 0 && l->alias == 0 )
free_locale(l);
UNLOCK();
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(locale)
PRED_DEF("locale_property", 2, locale_property, PL_FA_NONDETERMINISTIC)
PRED_DEF("locale_create", 3, locale_create, 0)
PRED_DEF("locale_destroy", 1, locale_destroy, 0)
PRED_DEF("set_locale", 1, set_locale, 0)
PRED_DEF("current_locale", 1, current_locale, 0)
EndPredDefs
#endif /*O_LOCALE*/