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84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*ident "@(#)C++env:incl-master/proto-headers/generic.h 1.1" */
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#ifndef applec
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#usedby all
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#endif
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/**************************************************************************
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Copyright (c) 1984 AT&T
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All Rights Reserved
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THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T
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The copyright notice above does not evidence any
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actual or intended publication of such source code.
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*****************************************************************************/
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#ifndef __GENERIC__
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#define __GENERIC__ 1
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/* macros to paste tokens together to form new names */
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/* 4.2BSD and System V cpp's have different mechanisms for
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pasting tokens together, but 4.3BSD agrees with System V.
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ANSI C has defined a new way.
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*/
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#ifdef applec // for Macintosh
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/* ANSI C preprocessors will not expand the arguments to a macro;
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* so we need to add a level of indirection to allow macro expansion of
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* arguments. (Reiser preprocessors allowed the first arg to be expanded;
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* this method will allow both to be expanded, which is better than none.)
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*/
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#define name2(a,b) _name2_aux(a,b)
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#define _name2_aux(a,b) a##b
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#define name3(a,b,c) _name3_aux(a,b,c)
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#define _name3_aux(a,b,c) a##b##c
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#define name4(a,b,c,d) _name4_aux(a,b,c,d)
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#define _name4_aux(a,b,c,d) a##b##c##d
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#else
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#os bsd3 svr2 svr3 sunos3 sunos4 hpux uts
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#define name2(a,b) a/**/b
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#define name3(a,b,c) a/**/b/**/c
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#define name4(a,b,c,d) a/**/b/**/c/**/d
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#endos
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#os bsd2 alliant
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#define name2(a,b) a\
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b
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#define name3(a,b,c) a\
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b\
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c
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#define name4(a,b,c,d) a\
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b\
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c\
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d
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#endos
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#endif
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#ifdef applec /* for Macintosh */
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// Alas, MPW C++ doesn't have an ANSI C conformant preprocessor, so
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// the AT&T code as given doesn't work. The code below will work for
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// MPW C++, but **NOT** for a compiler with an ANSI C conformant
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// preprocessor because the preprocessor isn't supposed to expand
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// operands of ##. Undefine applec to use this header with other
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// compilers. Thanks to Allen Cecil for the suggested "fix".
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# define declare(a,t) a##declare(t)
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# define implement(a,t) a##implement(t)
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# define declare2(a,t1,t2) a##declare2(t1,t2)
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# define implement2(a,t1,t2) a##implement2(t1,t2)
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#else /* applec */
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#define declare(a,t) name2(a,declare)(t)
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#define implement(a,t) name2(a,implement)(t)
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#define declare2(a,t1,t2) name2(a,declare2)(t1,t2)
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#define implement2(a,t1,t2) name2(a,implement2)(t1,t2)
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#endif /* applec */
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extern genericerror(int,char*);
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typedef int (*GPT)(int,char*);
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#define set_handler(generic,type,x) name4(set_,type,generic,_handler)(x)
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#define errorhandler(generic,type) name3(type,generic,handler)
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#define callerror(generic,type,a,b) (*errorhandler(generic,type))(a,b)
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#endif
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