>Dave,
>You need not be amazed; your idea is sound and as you mentioned, getting the >brackets >right was the worst of it. Congrats on the code transformation from simply >"nasty" to >"really horrid" and finally "truely noxious". I'll insert some line breaks >and comments to >make it potentially readable. (Here I thought APL was the only write-only >language.) >Perhaps this original code struck you as nasty because it is really a hidden >OS dependency, >is it not? Or are character set arrangements not included in that realm? Well it’s a character set dependency and a really neat piece of optimization. However its hiding something in a bit field, a trick which in High Level languages has always caused me problems in the past. I think it would be more portable to have the Alphabet as a string “ABCDEFGHIJKLMNOPQRSTUVWXYZ” and then search through it for the wanted character, but of course much slower… As Michael Jackson once said :- "Beer may cause you to digress--and lead a happier life" (that was another late and much lamented Michael Jackson aka “the beer hunter” - https://en.wikipedia.org/wiki/Michael_Jackson_(writer)” Michael Jackson author of – Principles of Program Design - https://en.wikipedia.org/wiki/Michael_A._Jackson Had a more apposite saying, that is “we will look at optimaztion – but later on” , perhaps its not time… >Thinking about related matters, do I need to be concerned that the IBM systems >are >big endian? It appears that simh takes this into account with the sim_finit >routine in sim_fio.c, >but there could be other places with data coding assumptions not fitting the >/370 architecture. It possible, but its probably easier to try and test, rather than to find. >For the moment, I hacked the "attach" <dev>" code to avoid a rb+ file open >attempt since >the CMS implementation of the stdio package does not support simultaneous r/w >file access. >This will surely prove to be another big problem, but for now the attach is >successful for an >existing file. You didn’t say which IBM platform you were running this on, and which “C” compiler…. Fritz Dave From: rubh...@aol.com [mailto:rubh...@aol.com] Sent: 01 August 2015 18:32 To: dave.g4...@gmail.com Cc: simh@trailing-edge.com Subject: Re: [Simh] Porting simh for IBM VM/CMS -----Original Message----- From: Dave G4UGM <dave.g4...@gmail.com <mailto:dave.g4...@gmail.com> > To: rubhone <rubh...@aol.com <mailto:rubh...@aol.com> > Cc: 'simh' <simh@trailing-edge.com <mailto:simh@trailing-edge.com> > Sent: Fri, Jul 31, 2015 7:09 am Subject: RE: [Simh] Porting simh for IBM VM/CMS I am amazed, and very glad, it works, been ages since I wrote any “C” …. .. and as for threads, well they are hidden in the headers, and should just pick up again. Dave Wade G4UGM
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