Update 1991/fine/README.md + add mastodon handle
Undo rot13 and fix formatting. Added mastodon handle. This was done in the author/Thomas_A_Fine.json file too.
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@@ -1,11 +1,8 @@
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# Best One Liner
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Thomas A. Fine
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Ohio State University
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Department of Computer and Information Science
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2036 Neil Avenue Mall
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Columbus, Ohio 43210
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US
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Thomas A. Fine<br>
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US<br>
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[@thomasafine@social.linux.pizza](https://social.linux.pizza/@thomasafine)
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## To build:
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@@ -60,43 +57,43 @@ The author wishes to thank J Greely for the last 6 bytes.
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Here's about how it does it: [rot13 to read]
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NOTE: Bits are referred to as 76543210, high to low.
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1. Get the character in variable `a`. Note the fun way we check for `EOF`.
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(thanks J).
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2. Reverse bit 6, and strip bit 5. Bit 6 determines (mostly) whether
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or not this character is a letter. Bit 5 would determine case if
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we cared. Assign this value to variable `b` (We need to save it,
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since we need to make 2 comparisons and maybe one operation with
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this value). We can't abuse our first variable, since it saves the
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bits we're changing.
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3. Check this value to see if it is a letter. It must be non-zero -
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if it is zero, then we have either the `@` (64) or the
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`` ` `` (96). It also must be less than 27 - this checks the
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range for letters as well as implicitly checking the value of bit 6
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(if it was originally clear, it is set now, so `b` would be too big).
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4. If it is not a letter, the conditional expression inside of the
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`putchar()` returns the original character (`a`). Otherwise, it
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returns a really messy expression that performs the actual rotation
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and fixes the fifth and sixth bits:
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* A. Subtract 1, to get into the range 0-25 (for the modulo operation).
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* B. Add 13 to the character. Steps A and B are combined.
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* C. Take this modulo 26 to make the addition wrap around.
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* D. Fix bits 5 and 6, based on variable `a`.
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* E. Add 1 back in (we took it out in step A.) This is okay to do *after*
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step D, because we know the addition won't trickle up past the fourth bit
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(`b` would have to be 31 for this to happen).
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Notice that this implementation operates only on characters with the
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high bit clear. The high bit can be ignored without changing the size
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of the program. Also, if you know you are only dealing with seven bit
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data, the size can be reduced by one byte. These are left as exercises
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for the student.
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ABGR: Ovgf ner ersreerq gb nf 76543210, uvtu gb ybj.
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1. Trg gur punenpgre va inevnoyr n. Abgr gur sha jnl jr purpx sbe RBS.
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(gunaxf W).
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2. Erirefr ovg 6, naq fgevc ovg 5. Ovg 6 qrgrezvarf (zbfgyl) jurgure
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be abg guvf punenpgre vf n yrggre. Ovg 5 jbhyq qrgrezvar pnfr vs
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jr pnerq. Nffvta guvf inyhr gb inevnoyr o (Jr arrq gb fnir vg,
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fvapr jr arrq gb znxr 2 pbzcnevfbaf naq znlor bar bcrengvba jvgu
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guvf inyhr). Jr pna'g nohfr bhe svefg inevnoyr, fvapr vg fnirf gur
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ovgf jr'er punatvat.
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3. Purpx guvf inyhr gb frr vs vg vf n yrggre. Vg zhfg or aba-mreb -
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vs vg vf mreb, gura jr unir rvgure gur ng-fvta (64) be gur
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onpxdhbgr (96). Vg nyfb zhfg or yrff guna 27 - guvf purpxf gur
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enatr sbe yrggref nf jryy nf vzcyvpvgyl purpxvat gur inyhr bs ovg 6
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(vs vg jnf bevtvanyyl pyrne, vg vf frg abj, fb o jbhyq or gb ovt).
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4. Vs vg vf abg n yrggre, gur pbaqvgvbany rkcerffvba vafvqr bs gur
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chgpune() ergheaf gur bevtvany punenpgre (n). Bgurejvfr, vg
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ergheaf n ernyyl zrffl rkcerffvba gung cresbezf gur npghny ebgngvba
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naq svkrf gur svsgu naq fvkgu ovgf:
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N. Fhogenpg 1, gb trg vagb gur enatr 0-25 (sbe gur zbqhyb bcrengvba).
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O. Nqq 13 gb gur punenpgre. Fgrcf N naq O ner pbzovarq.
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P. Gnxr guvf zbqhyb 26 gb znxr gur nqqvgvba jenc nebhaq.
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Q. Svk ovgf 5 naq 6, onfrq ba inevnoyr n.
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R. Nqq 1 onpx va (jr gbbx vg bhg va fgrc N.) Guvf vf bxnl gb qb
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*nsgre* fgrc Q, orpnhfr jr xabj gur nqqvgvba jba'g gevpxyr hc
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cnfg gur sbhegu ovg (o jbhyq unir gb or 31 sbe guvf gb unccra).
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Abgvpr gung guvf vzcyrzragngvba bcrengrf bayl ba punenpgref jvgu gur
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uvtu ovg pyrne. Gur uvtu ovg pna or vtaberq jvgubhg punatvat gur fvmr
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bs gur cebtenz. Nyfb, vs lbh xabj lbh ner bayl qrnyvat jvgu frira ovg
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qngn, gur fvmr pna or erqhprq ol bar olgr. Gurfr ner yrsg nf rkrepvfrf
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sbe gur fghqrag.
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## Copyright and CC BY-SA 4.0 License:
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@@ -10,8 +10,8 @@
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"url" : "http://hea-www.harvard.edu/~fine/",
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"alt_url" : null,
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"deprecated_twitter_handle" : null,
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"mastodon" : null,
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"mastodon_url" : null,
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"mastodon" : "@thomasafine@social.linux.pizza",
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"mastodon_url" : "https://social.linux.pizza/@thomasafine",
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"github" : null,
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"affiliation" : null,
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"winning_entry_set" : [
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