libpurple/plugins/perl/perl-common.c

#include "debug.h"
#include "value.h"

#include "perl-common.h"

extern PerlInterpreter *my_perl;

static GHashTable *object_stashes = NULL;

void purple_perl_normalize_script_name(char *name)
{
	char *c;

	c = strrchr(name, '.');

	if (c != NULL)
		*c = '\0';

	for (c = name; *c != '\0'; c++) {
		if (*c != '_' && !g_ascii_isalnum(*c))
			*c = '_';
	}
}

static int
magic_free_object(pTHX_ SV *sv, MAGIC *mg)
{
	sv_setiv(sv, 0);

	return 0;
}

static MGVTBL vtbl_free_object =
{
	0, 0, 0, 0, magic_free_object, 0, 0
#if PERL_API_REVISION > 5 || (PERL_API_REVISION == 5 && PERL_API_VERSION >= 10)
	, 0
#endif
};

static SV *
create_sv_ptr(void *object)
{
	SV *sv;

	sv = newSViv((IV)object);

	sv_magic(sv, NULL, '~', NULL, 0);

	SvMAGIC(sv)->mg_private = 0x1551; /* HF */
	SvMAGIC(sv)->mg_virtual = &vtbl_free_object;

	return sv;
}

SV *
newSVGChar(const char *str)
{
	SV *sv;

	if (str == NULL)
		return &PL_sv_undef;

	sv = newSVpv(str, 0);
	SvUTF8_on(sv);

	return sv;
}

SV *
purple_perl_bless_object(void *object, const char *stash_name)
{
	HV *stash;
	HV *hv;

	if (object == NULL)
		return NULL;

	if (object_stashes == NULL) {
		object_stashes = g_hash_table_new(g_direct_hash, g_direct_equal);
	}

	stash = gv_stashpv(stash_name, 1);

	hv = newHV();
	hv_store(hv, "_purple", 7, create_sv_ptr(object), 0);

	return sv_bless(newRV_noinc((SV *)hv), stash);
}

gboolean
purple_perl_is_ref_object(SV *o)
{
	SV **sv;
	HV *hv;

	hv = hvref(o);

	if (hv != NULL) {
		sv = hv_fetch(hv, "_purple", 7, 0);

		if (sv != NULL)
			return TRUE;
	}

	return FALSE;
}

void *
purple_perl_ref_object(SV *o)
{
	SV **sv;
	HV *hv;
	void *p;

	if (o == NULL)
		return NULL;

	hv = hvref(o);

	if (hv == NULL)
		return NULL;

	sv = hv_fetch(hv, "_purple", 7, 0);

	if (sv == NULL)
		croak("variable is damaged");

	p = GINT_TO_POINTER(SvIV(*sv));

	return p;
}

/*
  2003/02/06: execute_perl modified by Mark Doliner <mark@kingant.net>
		Pass parameters by pushing them onto the stack rather than
		passing an array of strings.  This way, perl scripts can
		modify the parameters and we can get the changed values
		and then shoot ourselves.  I mean, uh, use them.

  2001/06/14: execute_perl replaced by Martin Persson <mep@passagen.se>
		previous use of perl_eval leaked memory, replaced with
		a version that uses perl_call instead

  30/11/2002: execute_perl modified by Eric Timme <timothy@voidnet.com>
		args changed to char** so that we can have preparsed
  		arguments again, and many headaches ensued! This essentially
		means we replaced one hacked method with a messier hacked
		method out of perceived necessity. Formerly execute_perl
		required a single char_ptr, and it would insert it into an
		array of character pointers and NULL terminate the new array.
		Now we have to pass in pre-terminated character pointer arrays
		to accomodate functions that want to pass in multiple arguments.

		Previously arguments were preparsed because an argument list
		was constructed in the form 'arg one','arg two' and was
		executed via a call like &funcname(arglist) (see .59.x), so
		the arglist was magically pre-parsed because of the method.
		With Martin Persson's change to perl_call we now need to
		use a null terminated list of character pointers for arguments
		if we wish them to be parsed. Lacking a better way to allow
		for both single arguments and many I created a NULL terminated
		array in every function that called execute_perl and passed
		that list into the function.  In the former version a single
		character pointer was passed in, and was placed into an array
		of character pointers with two elements, with a NULL element
		tacked onto the back, but this method no longer seemed prudent.

		Enhancements in the future might be to get rid of pre-declaring
		the array sizes?  I am not comfortable enough with this
		subject to attempt it myself and hope it to stand the test
		of time.
*/
int
execute_perl(const char *function, int argc, char **args)
{
	int count = 0, i, ret_value = 1;
	SV *sv_args[argc];
	dSP;
	PERL_SET_CONTEXT(my_perl);
	/*
	 * Set up the perl environment, push arguments onto the
	 * perl stack, then call the given function
	 */
	SPAGAIN;
	ENTER;
	SAVETMPS;
	PUSHMARK(sp);

	for (i = 0; i < argc; i++) {
		if (args[i]) {
			sv_args[i] = sv_2mortal(newSVpv(args[i], 0));
			XPUSHs(sv_args[i]);
		}
	}

	PUTBACK;
	PERL_SET_CONTEXT(my_perl);
	count = call_pv(function, G_EVAL | G_SCALAR);
	SPAGAIN;

	/*
	 * Check for "die," make sure we have 1 argument, and set our
	 * return value.
	 */
	if (SvTRUE(ERRSV)) {
		purple_debug(PURPLE_DEBUG_ERROR, "perl",
				   "Perl function %s exited abnormally: %s\n",
				   function, SvPVutf8_nolen(ERRSV));
		(void)POPs;
	} else if (count != 1) {
		/*
		 * This should NEVER happen.  G_SCALAR ensures that we WILL
		 * have 1 parameter.
		 */
		purple_debug(PURPLE_DEBUG_ERROR, "perl",
				   "Perl error from %s: expected 1 return value, "
				   "but got %d\n", function, count);
	} else
		ret_value = POPi;

	/* Check for changed arguments */
	for (i = 0; i < argc; i++) {
		if (args[i] && strcmp(args[i], SvPVX(sv_args[i]))) {
			/*
			 * Shizzel.  So the perl script changed one of the parameters,
			 * and we want this change to affect the original parameters.
			 * args[i] is just a temporary little list of pointers.  We don't
			 * want to free args[i] here because the new parameter doesn't
			 * overwrite the data that args[i] points to.  That is done by
			 * the function that called execute_perl.  I'm not explaining this
			 * very well.  See, it's aggregate...  Oh, but if 2 perl scripts
			 * both modify the data, _that's_ a memleak.  This is really kind
			 * of hackish.  I should fix it.  Look how long this comment is.
			 * Holy crap.
			 */
			args[i] = g_strdup(SvPVutf8_nolen(sv_args[i]));
		}
	}

	PUTBACK;
	FREETMPS;
	LEAVE;

	return ret_value;
}

#if 0
gboolean
purple_perl_value_from_sv(PurpleValue *value, SV *sv)
{
	switch (purple_value_get_type(value))
	{
		case PURPLE_TYPE_CHAR:
			if ((tmp = SvGChar(sv)) != NULL)
				purple_value_set_char(value, tmp[0]);
			else
				return FALSE;
			break;

		case PURPLE_TYPE_UCHAR:
			if ((tmp = SvPV_nolen(sv)) != NULL)
				purple_value_set_uchar(value, tmp[0]);
			else
				return FALSE;
			break;

		case PURPLE_TYPE_BOOLEAN:
			purple_value_set_boolean(value, SvTRUE(sv));
			break;

		case PURPLE_TYPE_INT:
			purple_value_set_int(value, SvIV(sv));
			break;

		case PURPLE_TYPE_UINT:
			purple_value_set_uint(value, SvIV(sv));
			break;

		case PURPLE_TYPE_LONG:
			purple_value_set_long(value, SvIV(sv));
			break;

		case PURPLE_TYPE_ULONG:
			purple_value_set_ulong(value, SvIV(sv));
			break;

		case PURPLE_TYPE_INT64:
			purple_value_set_int64(value, SvIV(sv));
			break;

		case PURPLE_TYPE_UINT64:
			purple_value_set_uint64(value, SvIV(sv));
			break;

		case PURPLE_TYPE_STRING:
			purple_value_set_string(value, SvGChar(sv));
			break;

		case PURPLE_TYPE_POINTER:
			purple_value_set_pointer(value, (void *)SvIV(sv));
			break;

		case PURPLE_TYPE_BOXED:
			if (!strcmp(purple_value_get_specific_type(value), "SV"))
				purple_value_set_boxed(value, (sv == &PL_sv_undef ? NULL : sv));
			else
				purple_value_set_boxed(value, sv);
			break;

		default:
			return FALSE;
	}

	return TRUE;
}

SV *
purple_perl_sv_from_value(const PurpleValue *value, va_list list)
{
	switch (purple_value_get_type(value))
	{
		case PURPLE_TYPE_BOOLEAN:
			return newSViv(purple_value_get_boolean(value));
			break;

		case PURPLE_TYPE_INT:
			return newSViv(purple_value_get_int(value));
			break;

		case PURPLE_TYPE_UINT:
			return newSVuv(purple_value_get_uint(value));
			break;

		case PURPLE_TYPE_LONG:
			return newSViv(purple_value_get_long(value));
			break;

		case PURPLE_TYPE_ULONG:
			return newSVuv(purple_value_get_ulong(value));
			break;

		case PURPLE_TYPE_INT64:
			return newSViv(purple_value_get_int64(value));
			break;

		case PURPLE_TYPE_UINT64:
			return newSVuv(purple_value_get_int64(value));
			break;

		case PURPLE_TYPE_STRING:
			return newSVGChar(purple_value_get_string(value));
			break;

		case PURPLE_TYPE_POINTER:
			return newSViv((IV)purple_value_get_pointer(value));
			break;

		case PURPLE_TYPE_BOXED:
			if (!strcmp(purple_value_get_specific_type(value), "SV"))
			{
				SV *sv = (SV *)purple_perl_get_boxed(value);

				return (sv == NULL ? &PL_sv_undef : sv);
			}

			/* Uh.. I dunno. Try this? */
			return sv_2mortal(purple_perl_bless_object(
					purple_perl_get_boxed(value),
					purple_value_get_specific_type(value)));

		default:
			return FALSE;
	}

	return TRUE;
}
#endif

void *
purple_perl_data_from_sv(PurpleValue *value, SV *sv)
{

	switch (purple_value_get_type(value)) {
		case PURPLE_TYPE_BOOLEAN: return (void *)SvIV(sv);
		case PURPLE_TYPE_INT:     return (void *)SvIV(sv);
		case PURPLE_TYPE_UINT:    return (void *)SvUV(sv);
		case PURPLE_TYPE_LONG:    return (void *)SvIV(sv);
		case PURPLE_TYPE_ULONG:   return (void *)SvUV(sv);
		case PURPLE_TYPE_INT64:   return (void *)SvIV(sv);
		case PURPLE_TYPE_UINT64:  return (void *)SvUV(sv);
		case PURPLE_TYPE_STRING:  return g_strdup(SvPVutf8_nolen(sv));
		case PURPLE_TYPE_POINTER: return (void *)SvIV(sv);
		case PURPLE_TYPE_BOXED:   return (void *)SvIV(sv);

		default:
			return NULL;
	}

	return NULL;
}

static SV *
purple_perl_sv_from_subtype(const PurpleValue *value, void *arg)
{
	const char *stash = "Purple"; /* ? */

	switch (purple_value_get_subtype(value)) {
		case PURPLE_SUBTYPE_ACCOUNT:
			stash = "Purple::Account";
			break;
		case PURPLE_SUBTYPE_BLIST:
			stash = "Purple::BuddyList";
			break;
		case PURPLE_SUBTYPE_BLIST_BUDDY:
			stash = "Purple::BuddyList::Buddy";
			break;
		case PURPLE_SUBTYPE_BLIST_GROUP:
			stash = "Purple::BuddyList::Group";
			break;
		case PURPLE_SUBTYPE_BLIST_CHAT:
			stash = "Purple::BuddyList::Chat";
			break;
		case PURPLE_SUBTYPE_BUDDY_ICON:
			stash = "Purple::Buddy::Icon";
			break;
		case PURPLE_SUBTYPE_CONNECTION:
			stash = "Purple::Connection";
			break;
		case PURPLE_SUBTYPE_CONVERSATION:
			stash = "Purple::Conversation";
			break;
		case PURPLE_SUBTYPE_PLUGIN:
			stash = "Purple::Plugin";
			break;
		case PURPLE_SUBTYPE_BLIST_NODE:
			stash = "Purple::BuddyList::Node";
			break;
		case PURPLE_SUBTYPE_CIPHER:
			stash = "Purple::Cipher";
			break;
		case PURPLE_SUBTYPE_STATUS:
			stash = "Purple::Status";
			break;
		case PURPLE_SUBTYPE_SAVEDSTATUS:
			stash = "Purple::SavedStatus";
			break;
		case PURPLE_SUBTYPE_LOG:
			stash = "Purple::Log";
			break;
		case PURPLE_SUBTYPE_XFER:
			stash = "Purple::Xfer";
			break;
		case PURPLE_SUBTYPE_XMLNODE:
			stash = "Purple::XMLNode";
			break;
 		case PURPLE_SUBTYPE_USERINFO:
 			stash = "Purple::NotifyUserInfo";
 			break;
 		case PURPLE_SUBTYPE_STORED_IMAGE:
 			stash = "Purple::StoredImage";
 			break;
 		case PURPLE_SUBTYPE_CERTIFICATEPOOL:
 			stash = "Purple::Certificate::Pool";
 			break;
 		case PURPLE_SUBTYPE_UNKNOWN:
 			stash = "Purple::Unknown";
 			break;
  	}

	return sv_2mortal(purple_perl_bless_object(arg, stash));
}

SV *
purple_perl_sv_from_vargs(const PurpleValue *value, va_list *args, void ***copy_arg)
{
	if (purple_value_is_outgoing(value)) {
		switch (purple_value_get_type(value)) {
			case PURPLE_TYPE_SUBTYPE:
				if ((*copy_arg = va_arg(*args, void **)) == NULL)
					return &PL_sv_undef;

				return purple_perl_sv_from_subtype(value, *(void **)*copy_arg);

			case PURPLE_TYPE_BOOLEAN:
				if ((*copy_arg = (void *)va_arg(*args, gboolean *)) == NULL)
					return &PL_sv_undef;

				return newSViv(*(gboolean *)*copy_arg);

			case PURPLE_TYPE_INT:
				if ((*copy_arg = (void *)va_arg(*args, int *)) == NULL)
					return &PL_sv_undef;

				return newSViv(*(int *)*copy_arg);

			case PURPLE_TYPE_UINT:
				if ((*copy_arg = (void *)va_arg(*args, unsigned int *)) == NULL)
					return &PL_sv_undef;

				return newSVuv(*(unsigned int *)*copy_arg);

			case PURPLE_TYPE_LONG:
				if ((*copy_arg = (void *)va_arg(*args, long *)) == NULL)
					return &PL_sv_undef;

				return newSViv(*(long *)*copy_arg);

			case PURPLE_TYPE_ULONG:
				if ((*copy_arg = (void *)va_arg(*args,
												unsigned long *)) == NULL)
					return &PL_sv_undef;

				return newSVuv(*(unsigned long *)*copy_arg);

			case PURPLE_TYPE_INT64:
				if ((*copy_arg = (void *)va_arg(*args, gint64 *)) == NULL)
					return &PL_sv_undef;

				return newSViv(*(gint64 *)*copy_arg);

			case PURPLE_TYPE_UINT64:
				if ((*copy_arg = (void *)va_arg(*args, guint64 *)) == NULL)
					return &PL_sv_undef;

				return newSVuv(*(guint64 *)*copy_arg);

			case PURPLE_TYPE_STRING:
				if ((*copy_arg = (void *)va_arg(*args, char **)) == NULL)
					return &PL_sv_undef;

				return newSVGChar(*(char **)*copy_arg);

			case PURPLE_TYPE_POINTER:
				if ((*copy_arg = va_arg(*args, void **)) == NULL)
					return &PL_sv_undef;

				return newSViv((IV)*(void **)*copy_arg);

			case PURPLE_TYPE_BOXED:
				/* Uh.. I dunno. Try this? */
				if ((*copy_arg = va_arg(*args, void **)) == NULL)
					return &PL_sv_undef;

				return sv_2mortal(purple_perl_bless_object(
						*(void **)*copy_arg,
						purple_value_get_specific_type(value)));

			default:
				/* If this happens, things are going to get screwed up... */
				return NULL;
		}
	} else {
		switch (purple_value_get_type(value)) {
			case PURPLE_TYPE_SUBTYPE:
				if ((*copy_arg = va_arg(*args, void *)) == NULL)
					return &PL_sv_undef;

				return purple_perl_sv_from_subtype(value, *copy_arg);

			case PURPLE_TYPE_BOOLEAN:
				*copy_arg = GINT_TO_POINTER( va_arg(*args, gboolean) );

				return newSViv((gboolean)GPOINTER_TO_INT(*copy_arg));

			case PURPLE_TYPE_INT:
				*copy_arg = GINT_TO_POINTER( va_arg(*args, int) );

				return newSViv(GPOINTER_TO_INT(*copy_arg));

			case PURPLE_TYPE_UINT:
				*copy_arg = GUINT_TO_POINTER(va_arg(*args, unsigned int));

				return newSVuv(GPOINTER_TO_UINT(*copy_arg));

			case PURPLE_TYPE_LONG:
				*copy_arg = (void *)va_arg(*args, long);

				return newSViv((long)*copy_arg);

			case PURPLE_TYPE_ULONG:
				*copy_arg = (void *)va_arg(*args, unsigned long);

				return newSVuv((unsigned long)*copy_arg);

			case PURPLE_TYPE_INT64:
#if 0
				/* XXX This yells and complains. */
				*copy_arg = va_arg(*args, gint64);

				return newSViv(*copy_arg);
#endif
				break;

			case PURPLE_TYPE_UINT64:
				/* XXX This also yells and complains. */
#if 0
				*copy_arg = (void *)va_arg(*args, guint64);

				return newSVuv(*copy_arg);
#endif
				break;

			case PURPLE_TYPE_STRING:
				if ((*copy_arg = (void *)va_arg(*args, char *)) == NULL)
					return &PL_sv_undef;

				return newSVGChar((char *)*copy_arg);

			case PURPLE_TYPE_POINTER:
				if ((*copy_arg = (void *)va_arg(*args, void *)) == NULL)
					return &PL_sv_undef;

				return newSViv((IV)*copy_arg);

			case PURPLE_TYPE_BOXED:
				/* Uh.. I dunno. Try this? */
				if ((*copy_arg = (void *)va_arg(*args, void *)) == NULL)
					return &PL_sv_undef;

				return sv_2mortal(purple_perl_bless_object(*copy_arg,
						purple_value_get_specific_type(value)));

			default:
				/* If this happens, things are going to get screwed up... */
				return NULL;
		}
	}

	return NULL;
}

SV *purple_perl_sv_from_fun(PurplePlugin *plugin, SV *callback)
{
	SV *sv = NULL;

	if (SvTYPE(callback) == SVt_RV) {
		SV *cbsv = SvRV(callback);

		if (SvTYPE(cbsv) == SVt_PVCV) {
			sv = newSVsv(callback);
		}
	} else if (SvTYPE(callback) == SVt_PV) {
		PurplePerlScript *gps;

		gps = (PurplePerlScript *)PURPLE_PLUGIN_LOADER_INFO(plugin);
		sv = newSVpvf("%s::%s", gps->package, SvPV_nolen(callback));
	} else {
		purple_debug_warning("perl", "Callback not a valid type, only strings and coderefs allowed.\n");
	}

	return sv;
}