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NSObjCRuntime.m
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/** Implementation of ObjC runtime for GNUStep
Copyright (C) 1995 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
Date: Aug 1995
This file is part of the GNUstep Base Library.
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 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 USA.
<title>NSObjCRuntime class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#if !defined (__GNU_LIBOBJC__)
# include <objc/encoding.h>
#endif
#import "Foundation/NSException.h"
/**
* Returns a string object containing the name for
* aProtocol. If aProtocol is 0, returns nil.
*/
GS_DECLARE NSString *
NSStringFromProtocol(Protocol *aProtocol)
{
if (aProtocol != (Protocol*)0)
return [NSString stringWithUTF8String: protocol_getName(aProtocol)];
return nil;
}
/**
* Returns the protocol whose name is supplied in the
* aProtocolName argument, or 0 if a nil string is supplied.
*/
GS_DECLARE Protocol *
NSProtocolFromString(NSString *aProtocolName)
{
if (aProtocolName != nil)
{
int len = [aProtocolName length];
char buf[len+1];
[aProtocolName getCString: buf
maxLength: len + 1
encoding: NSASCIIStringEncoding];
return GSProtocolFromName (buf);
}
return (Protocol*)0;
}
/**
* Returns a string object containing the name for
* aSelector. If aSelector is 0, returns nil.
*/
GS_DECLARE NSString *
NSStringFromSelector(SEL aSelector)
{
if (aSelector != (SEL)0)
return [NSString stringWithUTF8String: sel_getName(aSelector)];
return nil;
}
/**
* Returns (creating if necessary) the selector whose name is supplied in the
* aSelectorName argument, or 0 if a nil string is supplied.
*/
GS_DECLARE SEL
NSSelectorFromString(NSString *aSelectorName)
{
if (aSelectorName != nil)
{
int len = [aSelectorName length];
char buf[len+1];
[aSelectorName getCString: buf
maxLength: len + 1
encoding: NSASCIIStringEncoding];
return sel_registerName (buf);
}
return (SEL)0;
}
/**
* Returns the class whose name is supplied in the
* aClassName argument, or Nil if a nil string is supplied.
* If no such class has been loaded, the function returns Nil.
*/
GS_DECLARE Class
NSClassFromString(NSString *aClassName)
{
if (aClassName != nil)
{
int len = [aClassName length];
char buf[len+1];
[aClassName getCString: buf
maxLength: len + 1
encoding: NSASCIIStringEncoding];
return objc_lookUpClass (buf);
}
return (Class)0;
}
/**
* Returns an [NSString] object containing the class name for
* aClass. If aClass is 0, returns nil.
*/
GS_DECLARE NSString *
NSStringFromClass(Class aClass)
{
if (aClass != (Class)0)
return [NSString stringWithUTF8String: (char*)class_getName(aClass)];
return nil;
}
/**
* When provided with a C string containing encoded type information,
* this method extracts size and alignment information for the specified
* type into the buffers pointed to by sizep and alignp.<br />
* If either sizep or alignp is a null pointer, the corresponding data is
* not extracted.<br />
* The function returns a pointer into the type information C string
* immediately after the decoded information.
*/
GS_DECLARE const char *
NSGetSizeAndAlignment(const char *typePtr,
NSUInteger *sizep, NSUInteger *alignp)
{
if (typePtr != NULL)
{
/* Skip any offset, but don't call objc_skip_offset() as that's buggy.
*/
if (*typePtr == '+' || *typePtr == '-')
{
typePtr++;
}
while (isdigit(*typePtr))
{
typePtr++;
}
typePtr = objc_skip_type_qualifiers (typePtr);
if (sizep)
{
*sizep = objc_sizeof_type (typePtr);
}
if (alignp)
{
*alignp = objc_alignof_type (typePtr);
}
typePtr = objc_skip_typespec (typePtr);
}
return typePtr;
}