fix 2020/burton Makefile, experiment with a README.md style
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@@ -1,4 +1,6 @@
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check
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check_be
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check_le
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prog
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prog_be
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prog_le
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+129
-397
@@ -1,14 +1,41 @@
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#!/usr/bin/env make
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#
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# 2020 makefile
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# IOCCC 2020 winning entry - burton
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################################################################################
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#
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# This work by Landon Curt Noll, Simon Cooper, and Leonid A. Broukhis
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# is licensed under:
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# Regarding individual entries:
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#
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# IOCCC winning entry code may not work on your system. Even with standards,
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# conditions and build environments change, especially when it comes to more
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# extreme code such you might find in an IOCCC winner. Moreover, what was
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# allowed and liked in one IOCCC contest may no longer be liked/allowed in
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# later IOCCC years.
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#
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# Corrections on winning author and fixing typos in remarks are VERY WELCOME.
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#
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# GitHub pull requests are welcome:
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#
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# If you have a patch that might make running an entry work in modern Unix-like
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# environments, please create a GitHub pull request for the IOCCC judges to
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# consider.
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#
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# Suggestions and corrections regarding Makefiles, winning author information,
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# fixing typos in remarks, and code patches are welcome via opening a GitHub
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# issue or better yet, by creating a GitHub pull request for the IOCCC judges
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# to consider. To form a GitHub issue or GitHub pull, please visit:
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#
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# https://github.com/ioccc-src/winner
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#
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################################################################################
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# This work by Landon Curt Noll and Leonid A. Broukhis is licensed under:
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#
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# Creative Commons Attribution-ShareAlike 3.0 Unported License.
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#
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# See: http://creativecommons.org/licenses/by-sa/3.0/
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#############################
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# shell used by this Makefile
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#############################
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@@ -19,264 +46,7 @@ SHELL= bash
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# common tool locations
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#######################
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#
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A2P= a2p
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AR= ar
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ASA= asa
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AT= at
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ATQ= atq
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ATRM= atrm
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AWK= awk
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BANNER= banner
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BASE64= base64
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BASENAME= basename
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BATCH= batch
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BC= bc
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BINHEX= binhex
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BISON= bison
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BUNZIP2= bunzip2
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BZCAT= bzcat
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BZCMP= bzcmp
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BZDIFF= bzdiff
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BZEGREP= bzegrep
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BZFGREP= bzfgrep
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BZGREP= bzgrep
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BZIP2= bzip2
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BZLESS= bzless
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BZMORE= bzmore
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C2PH= c2ph
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C89= c89
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C99= c99
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CAL= cal
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CALC= calc
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CAT= cat
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CD= cd
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CHFLAGS= chflags
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CHGRP= chgrp
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CHMOD= chmod
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CKSUM= cksum
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CLANG= clang
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CLANG_PLUSPLUS= clang++
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CLEAR= clear
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CMP= cmp
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COL= col
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COLLDEF= colldef
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COLRM= colrm
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COLUMN= column
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COMPRESS= compress
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CP= cp
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CPIO= cpio
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CPP= cpp
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CRC32= crc32
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CSH= csh
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CSPLIT= csplit
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CURL= curl
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CUT= cut
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C_PLUSPLUS= c++
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C_PLUSPLUS_FILT= c++filt
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DATE= date
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DC= dc
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DD= dd
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DF= df
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DIFF3= diff3
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DIFF= diff
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DIG= dig
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DIRNAME= dirname
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ED= ed
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EGREP= egrep
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ENV= env
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EQN= eqn
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ETAGS= etags
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EXPECT= expect
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EXPR= expr
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FALSE= false
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FGREP= fgrep
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FILE= file
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FIND2PERL= find2perl
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FIND= find
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FLEX= flex
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FLEX_PLUSPLUS= flex++
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FMT= fmt
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FOLD= fold
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FS_USAGE= fs_usage
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FUNZIP= funzip
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FUSER= fuser
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GCC= gcc
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GDIFFMK= gdiffmk
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GENCAT= gencat
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GENSTRINGS= genstrings
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GETOPT= getopt
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GETOPTS= getopts
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GINDENT= gindent
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GNUMAKE= gnumake
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GREP= grep
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GROFF= groff
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GROFFER= groffer
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GROG= grog
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GROPS= grops
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GROTTY= grotty
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GUNZIP= gunzip
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GVIM= gvim
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GZCAT= gzcat
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GZEXE= gzexe
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GZIP_PROG= gzip
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G_PLUSPLUS= g++
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H2PH= h2ph
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H2XS= h2xs
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HASH= hash
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HEAD= head
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HOSTNAME_PROG= hostname
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ICONV= iconv
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ID= id
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INDENT= indent
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INFO= info
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JOT= jot
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KILL= kill
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KSH= ksh
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LAST= last
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LD= ld
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LESSECHO= lessecho
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LEX= len
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LINK= link
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LN= ln
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LS= ls
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M4= m4
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MAKE= make
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MAN= man
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MKDIR= mkdir
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MKFIFO= mkfifo
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MKTEMP= mktemp
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MV= mv
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NANO= nano
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NASM= nasm
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NEQN= neqn
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NICE= nice
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NL= nl
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NM= nm
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NOHUP= nohup
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NROFF= nroff
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NSLOOKUP= nslookup
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OD= od
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OPENSSL= openssl
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PASTE= paste
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PATCH= patch
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PATHCHK= pathchk
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PAX= pax
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PERL= perl
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PICO= pico
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PR= pr
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PRINTENV= printenv
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PS= ps
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PTAR= ptar
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PTARDIFF= ptardiff
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PTARGREP= ptargrep
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PWD= pwd
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PYDOC= pydoc
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PYTHON= python
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PYTHONW= pythonw
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READLINK= readlink
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RENICE= renice
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RESET= reset
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REV= rev
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RI= ri
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RM= rm
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RMDIR= rmdir
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RSYNC= rsync
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RUBY= ruby
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RVIM= rvim
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SAY= say
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SCP= scp
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SCREEN= screen
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SCRIPT= script
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SDIFF= sdiff
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SED= sed
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SEQ= seq
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SFTP= sftp
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SH= sh
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SHA1= sha1
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SHA= sha
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SHAR= shar
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SHASUM5_18= shasum5.18
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SHASUM= shasum
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SIZE= size
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SLEEP= sleep
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SORT= sort
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SSH= ssh
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STAT= stat
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STRIP= strip
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STTY= stty
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SUM= sum
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SYNC= sync
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TABS= tabs
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TAIL= tail
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TAR= tar
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TEE= tee
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TEST= test
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TFTP= tftp
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TIDY= tidy
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TIME= time
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TOP= top
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TOUCH= touch
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TPUT= tout
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TPUT= tput
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TR= tr
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TROFF= troff
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TRUE= true
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TSET= tset
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TSORT= tsort
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UL= ul
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UNAME= uname
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UNCOMPRESS= uncompress
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UNEXPAND= unexpand
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UNIFDEF= unifdef
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UNIFDEFALL= unifdefall
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UNIQ= uniq
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UNITS= units
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UNLINK= unlink
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UNZIP= unzip
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UNZIPSFX= unzipsfx
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UPTIME= uptime
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UUDECODE= uudecode
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UUENCODE= uuencode
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UUIDGEN= uuidgen
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VI= vi
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VIEW= view
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VIM= vim
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VIMDIFF= vimdiff
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W= w
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WAIT4PATH= wait4path
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WAIT= wait
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WC= wc
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WHAT= what
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WHATIS= whatis
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WHICH= which
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WHO= who
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WHOAMI= whoami
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WHOIS= whois
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WRTIE= write
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XAR= xar
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XARGS= xargs
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XATTR= xattr
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XXD= xxd
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YACC= yacc
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YES= yes
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ZCAT= zcat
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ZCMP= zcmp
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ZDIFF= zdiff
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ZEGREP= zegrep
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ZFGREP= zfgrep
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ZFORCE= zforce
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ZGREP= zgrep
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ZIP= zip
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ZIPCLOAK= zipcloak
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ZIPGREP= zipgrep
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ZIPINFO= zipinfo
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ZIPNOTE= zipnote
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ZIPSPLIT= zipsplit
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ZLESS= zless
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ZMORE= zmore
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ZNEW= znew
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ZPRINT= zprint
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ZSH= zsh
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include ../../var.mk
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# Set X11_LIBDIR to the directory where the X11 library resides
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#
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@@ -290,60 +60,25 @@ X11_LIBDIR= /opt/X11/lib
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#X11_INCDIR= /usr/X11/include
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X11_INCDIR= /opt/X11/include
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# CWARN - Silence warnings that ${CWARN} would normally complain about
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# CSILENCE -Compiler warnings
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#
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ifeq ($(CC),clang)
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# clang CSILENCE and CWARN
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# Common C compiler warnings to silence
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#
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CSILENCE=
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#CSILENCE= -Wno-implicit-int
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#
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#CWARN= $CSILENCE}
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#CWARN= -Wall $CSILENCE}
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#CWARN= -Wall -Wextra $CSILENCE}
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#CWARN= -Wall -Wextra -pedantic ${CSILENCE}
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#CWARN= -Wall -Wextra -Weverything $CSILENCE}
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CWARN= -Wall -Wextra -Weverything -pedantic ${CSILENCE}
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else
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ifeq ($(CC),gcc)
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# gcc CSILENCE and CWARN
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# Common C compiler warning flags
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#
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CSILENCE=
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#CSILENCE= -Wno-implicit-int
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#
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#CWARN= $CSILENCE}
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#CWARN= -Wall $CSILENCE}
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#CWARN= -Wall -Wextra $CSILENCE}
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#CWARN= ${CSILENCE}
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#CWARN= -Wall ${CSILENCE}
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#CWARN= -Wall -Wextra ${CSILENCE}
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CWARN= -Wall -Wextra -pedantic ${CSILENCE}
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else
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# default CSILENCE and WARN
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#
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CSILENCE=
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#CSILENCE= -Wno-implicit-int
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#
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#CWARN= $CSILENCE}
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#CWARN= -Wall $CSILENCE}
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#CWARN= -Wall -Wextra $CSILENCE}
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CWARN= -Wall -Wextra -pedantic ${CSILENCE}
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#CWARN= -Wall -Wextra -Weverything $CSILENCE}
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#CWARN= -Wall -Wextra -Weverything -pedantic ${CSILENCE}
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endif
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endif
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# compiler standard
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# Compiler standard
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#
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#CSTD=
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#CSTD= -ansi
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CSTD= -std=c11
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CSTD= -std=gnu99
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# compiler bit architecture
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# Compiler bit architecture
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#
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# Some entries require 32-bitness:
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# ARCH= -m32
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@@ -355,20 +90,21 @@ CSTD= -std=c11
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#
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ARCH=
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# defines that are needed to compile
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# Defines that are needed to compile
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#
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CDEFINE=
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#CDEFINE= -DIOCCC
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# include files that are needed to compile
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# Include files that are needed to compile
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#
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#CINCLUDE=
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#CINCLUDE= -include stdlib.h
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#CINCLUDE= -include stdio.h
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CINCLUDE= -include stdlib.h -include stdio.h
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#CINCLUDE= -I ${X11_INCDIR}
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#CINCLUDE= `${SDL2_CONFIG} --cflags`
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# optimization
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# Optimization
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#
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# Most compiles will safely use -O2. Some can use only -O1 or -O.
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# A few compilers have broken optimizers or this entry make break
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@@ -381,46 +117,66 @@ CINCLUDE= -include stdlib.h -include stdio.h
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#OPT= -O2
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OPT= -O3
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# default flags for ANSI C compilation
|
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# Default flags for ANSI C compilation
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||||
#
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CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
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|
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# Libraries needed to build
|
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#
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LIBS=
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#LIBS= -L ${X11_LIBDIR}
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#LIBS= -lm
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#LIBS= -L ${X11_LIBDIR} -lX11
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#LIBS= `${SDL2_CONFIG} --libs`
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# ANSI compiler
|
||||
#
|
||||
# Set CC to the name of your ANSI compiler.
|
||||
#
|
||||
# Some entries seem to need gcc. If you have gcc, set
|
||||
# both CC and MAY_NEED_GCC to gcc.
|
||||
#
|
||||
# If you do not have gcc, set CC to the name of your ANSI compiler, and
|
||||
# set MAY_NEED_GCC to either ${CC} (and hope for the best) or to just :
|
||||
# to disable such programs.
|
||||
# C compiler to use
|
||||
#
|
||||
CC= cc
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||||
#CC= clang
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||||
MAY_NEED_GCC= gcc
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||||
#CC=clang
|
||||
#CC=gcc
|
||||
|
||||
# Compiler add-ons or replacements for clang only
|
||||
#
|
||||
ifeq ($(CC),clang)
|
||||
#
|
||||
CSILENCE+= -Wno-poison-system-directories
|
||||
#
|
||||
CWARN+= -Weverything
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||||
#
|
||||
endif
|
||||
|
||||
# Specific add-ons or replacements for gcc only
|
||||
#
|
||||
ifeq ($(CC),gcc)
|
||||
#
|
||||
#CSILENCE+=
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||||
#
|
||||
#CWARN+=
|
||||
#
|
||||
endif
|
||||
|
||||
|
||||
##############################
|
||||
# Special flags for this entry
|
||||
##############################
|
||||
#
|
||||
OBJ= prog.o prog_be.o
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||||
DATA= correct
|
||||
TARGET= prog prog_be check check_be
|
||||
ENTRY= burton
|
||||
PROG= prog
|
||||
#
|
||||
ALT_OBJ= prog.orig.o
|
||||
ALT_TARGET= prog.orig prog_be.orig
|
||||
OBJ= ${PROG}.o
|
||||
DATA= correct
|
||||
TARGET= ${PROG}
|
||||
#
|
||||
ALT_OBJ= ${PROG}_le.o
|
||||
ALT_TARGET= ${PROG}_le
|
||||
|
||||
# magic define parameters for Little Endian machines
|
||||
#
|
||||
B=6945503773712347754LL
|
||||
I=5859838231191962459LL
|
||||
T=0
|
||||
S=7
|
||||
|
||||
# magic define parameters for Big Endian machines
|
||||
#
|
||||
_B=7091606191627001958LL
|
||||
_I=6006468689561538903LL
|
||||
@@ -432,40 +188,30 @@ _S=0
|
||||
# build the entry
|
||||
#################
|
||||
#
|
||||
all: ${TARGET} ${DATA}
|
||||
all: data ${TARGET}
|
||||
@${TRUE}
|
||||
|
||||
prog: prog.c
|
||||
@echo "NOTE: this program will segfault without an argument."
|
||||
.PHONY: all alt data everything clean clobber install \
|
||||
love haste waste maker easter_egg sandwich \
|
||||
supernova deep_magic magic charon pluto
|
||||
|
||||
${PROG}: ${PROG}.c
|
||||
${CC} ${CFLAGS} -DB=${B} -DI=${I} -DT=${T} -DS=${S} $< -o $@ ${LIBS}
|
||||
|
||||
prog_be: prog.c
|
||||
@echo "NOTE: this program will segfault without an argument."
|
||||
${CC} ${CFLAGS} -DB=${_B} -DI=${_I} -DT=${_T} -DS=${_S} $< -o $@ ${LIBS}
|
||||
|
||||
check: check.sh
|
||||
@${RM} -f $@
|
||||
${PROG}_le: ${PROG}
|
||||
${RM} -f $@
|
||||
${CP} -f $< $@
|
||||
${CHMOD} +x $@
|
||||
|
||||
check_be: check_be.sh
|
||||
@${RM} -f $@
|
||||
${CP} -f $< $@
|
||||
${CHMOD} +x $@
|
||||
|
||||
test: check check_be prog prog_be correct
|
||||
./check ./prog | ${DIFF} -bw - correct
|
||||
./check_be ./prog_be | ${DIFF} -bw - correct
|
||||
test: check_le.sh check_be.sh prog_le prog_be correct
|
||||
./check_le.sh ./prog_le | ${DIFF} -bw - correct
|
||||
./check_be.sh ./prog_be | ${DIFF} -bw - correct
|
||||
|
||||
# alternative executable
|
||||
#
|
||||
alt: ${ALT_TARGET}
|
||||
alt: data ${ALT_TARGET}
|
||||
@${TRUE}
|
||||
|
||||
prog.orig: prog.orig.c
|
||||
${CC} ${CFLAGS} -DB=${B} -DI=${I} -DT=${T} -DS=${S} $< -o $@ ${LIBS}
|
||||
|
||||
prog_be.orig: prog.orig.c
|
||||
${PROG}_be: ${PROG}.c
|
||||
${CC} ${CFLAGS} -DB=${_B} -DI=${_I} -DT=${_T} -DS=${_S} $< -o $@ ${LIBS}
|
||||
|
||||
# data files
|
||||
@@ -473,13 +219,15 @@ prog_be.orig: prog.orig.c
|
||||
data: ${DATA}
|
||||
@${TRUE}
|
||||
|
||||
# both all and alt
|
||||
#
|
||||
everything: all alt
|
||||
|
||||
|
||||
###############
|
||||
# utility rules
|
||||
###############
|
||||
#
|
||||
everything: all alt
|
||||
|
||||
clean:
|
||||
${RM} -f ${OBJ} ${ALT_OBJ}
|
||||
@-if [ -f indent.c ]; then \
|
||||
@@ -494,24 +242,13 @@ clobber: clean
|
||||
echo 'ate sandwich'; \
|
||||
fi
|
||||
|
||||
nuke: clobber
|
||||
@${TRUE}
|
||||
|
||||
dist_clean: nuke
|
||||
@${TRUE}
|
||||
|
||||
install:
|
||||
@echo "Surely you are performing, Dr. Science!"
|
||||
@echo "Dr. Spock says that is not logical!"
|
||||
@${TRUE}
|
||||
|
||||
# backwards compatibility
|
||||
# you may be able to misunderstand the source by reading indent.c
|
||||
#
|
||||
build: all
|
||||
@${TRUE}
|
||||
|
||||
# you may be able to mis-understand the source by reading indent.c
|
||||
#
|
||||
indent.c: prog.c
|
||||
indent.c: ${PROG}.c
|
||||
@if which "${GINDENT}" >/dev/null 2>&1; then \
|
||||
echo ${RM} -f $@; \
|
||||
${RM} -f $@; \
|
||||
@@ -523,7 +260,7 @@ indent.c: prog.c
|
||||
echo "${INDENT} < $< > $@"; \
|
||||
${INDENT} < $< > $@; \
|
||||
else \
|
||||
echo "no intent prog found, ident $< yourself, sorry"; \
|
||||
echo "no intent tool found, ident $< yourself, sorry"; \
|
||||
echo "exit 1"; \
|
||||
exit 1; \
|
||||
fi
|
||||
@@ -545,26 +282,21 @@ waste:
|
||||
@echo 'haste'
|
||||
@${TRUE}
|
||||
|
||||
make:
|
||||
@echo 'We encourage you to attend a maker faire'
|
||||
maker:
|
||||
@echo 'Participate in a maker faire'
|
||||
@${TRUE}
|
||||
|
||||
easter_egg:
|
||||
@echo you expected to often mis-understand this $${RANDOM} magic
|
||||
@echo chongo '<was here>' "/\\oo/\\"
|
||||
@echo Eggy and Kitty
|
||||
@echo "you expected to often misunderstand this $${RANDOM} magic"
|
||||
@echo "chongo '<was here>' /\\oo/\\"
|
||||
@echo "Eggy"
|
||||
|
||||
fabricate fashion form frame manufacture produce: make
|
||||
@${TRUE}
|
||||
|
||||
sandwich:
|
||||
sandwich: easter_egg
|
||||
@if [ `id -u` -eq 0 ]; then \
|
||||
echo 'Okay.'; \
|
||||
echo $${RANDOM}`date +%s`$${RANDOM} | \
|
||||
${SHASUM} -a 512256 | \
|
||||
${SED} -e 's/ .*//' > $@; \
|
||||
echo "$${RANDOM}`date +%s`$${RANDOM}" > $@; \
|
||||
else \
|
||||
echo 'Reall?!? Make it yourself.'; \
|
||||
echo 'What? Make it yourself.'; \
|
||||
exit 1; \
|
||||
fi
|
||||
|
||||
@@ -572,47 +304,47 @@ sandwich:
|
||||
# as well as the West Coast Computer Faire and
|
||||
# you might be confused different. :-)
|
||||
#
|
||||
supernova: nuke
|
||||
supernova: sandwich
|
||||
@-if [ -r .code_anal ]; then \
|
||||
${RM} -f .code_anal_v6; \
|
||||
else \
|
||||
echo "planet deniers, like a few silly IAU members, are so cute when they try to defend their logic"; \
|
||||
echo "planet deniers, like some members of the IAU, are so cute when they try to defend their logic"; \
|
||||
fi
|
||||
@echo A $@ helps ${MAKE} the elements that help form planets
|
||||
@echo "A $@ helps ${MAKE} the elements that help form planets"
|
||||
@${TRUE}
|
||||
|
||||
deep_magic:
|
||||
deep_magic: supernova
|
||||
@-if [ -r .code_anal ]; then \
|
||||
ccode_analysis --deep_magic 253d8c80830e2df66c018820004b3d4939821bbd7d781fc50d9e633797e44f65d1d62c707bb7e5a82c328a37bbf9ecb4c46fb56aa3f08641fcf45d10ba3c6081 --FNV1a_hash_512_bit "prog"; \
|
||||
ccode_analysis --deep_magic 7889066cdbdf09b0408021754586e895be641cc9be29e7eafd3ca65359541f17 \
|
||||
--FNV1a_hash_512_bit -v2 "${PROG}" "${PROG}.c"; \
|
||||
else \
|
||||
echo "Wrong! Do it again!"; \
|
||||
sleep 1; \
|
||||
sleep 2; \
|
||||
echo "Wrong! Do it again!"; \
|
||||
sleep 1; \
|
||||
sleep 2; \
|
||||
echo "Wrong! Do it again!"; \
|
||||
fi
|
||||
@${TRUE}
|
||||
|
||||
magic: deep_magic
|
||||
@-if [ -r .code_anal ]; then \
|
||||
ccode_analysis --level 391581 --mode 216193 --state Riesel --FNV1a_hash_512_bit "prog"; \
|
||||
ccode_analysis --level 20003 --mode 5717175 --FNV1a_hash_512_bit -v2 "${PROG}" "${PROG}.c"; \
|
||||
else \
|
||||
echo "If you don't eat yer meat, you can't have any pudding!"; \
|
||||
echo "How can you have any pudding if you don't eat yer meat?!"; \
|
||||
echo "Be careful with that axe, Eugene."; \
|
||||
fi
|
||||
@${TRUE}
|
||||
|
||||
# The IOCCC resident astronomer states
|
||||
#
|
||||
charon: supernova
|
||||
@echo $@ is a dwarf planet
|
||||
@echo dwarf is a type of planet
|
||||
@echo therefore we continue to tell the IAU that $@ is a planet
|
||||
charon: magic
|
||||
@echo "$@ is a dwarf planet"
|
||||
@echo "dwarf is a type of planet"
|
||||
@echo "therefore IAU, $@ is a planet"
|
||||
|
||||
pluto: supernova
|
||||
pluto: charon
|
||||
${MAKE} charon
|
||||
@echo $@ is a dwarf planet
|
||||
@echo dwarf is a type of planet
|
||||
@echo therefore, $@ is a planet
|
||||
@echo having lots of planets is good feature because supernovae can help ${MAKE} a lot of them
|
||||
@echo "$@ is a dwarf planet"
|
||||
@echo "dwarf is a type of planet"
|
||||
@echo "therefore, $@ is a planet"
|
||||
@echo "having lots of planets is good feature because supernovae can help ${MAKE} a lot of them"
|
||||
+61
-27
@@ -1,37 +1,61 @@
|
||||
# Best one-liner
|
||||
|
||||
Dave Burton
|
||||
<http://snox.net/ioccc>
|
||||
Twitter: @lv2jmp
|
||||
```
|
||||
Dave Burton
|
||||
<http://snox.net/ioccc>
|
||||
Twitter: @lv2jmp
|
||||
```
|
||||
|
||||
## To build
|
||||
|
||||
The code for this entry can be found in prog.c
|
||||
```sh
|
||||
make
|
||||
```
|
||||
|
||||
## Judges' comments:
|
||||
### To use:
|
||||
### To run
|
||||
|
||||
make
|
||||
./prog
|
||||
```sh
|
||||
./prog arg ...
|
||||
```
|
||||
|
||||
NOTE: this entry will dump core if you do not specify an argument.
|
||||
|
||||
### Try:
|
||||
### Try
|
||||
|
||||
./prog 128
|
||||
```sh
|
||||
./prog 128
|
||||
|
||||
./prog_be 128
|
||||
./prog_le 128
|
||||
./prog_be 128
|
||||
|
||||
./prog 170
|
||||
./prog 170
|
||||
|
||||
./prog 85
|
||||
./prog 85
|
||||
|
||||
./prog 128 128
|
||||
./prog 128 128 128
|
||||
./prog 128 128 128 128
|
||||
# Can you determine why this shows strange output for the first and third
|
||||
# but not the second? Can you find a pattern here? What happens if you
|
||||
# specify different numbers?
|
||||
./prog 128 128
|
||||
./prog 128 128 128
|
||||
./prog 128 128 128 128
|
||||
```
|
||||
|
||||
### Selected Judges Remarks:
|
||||
### Alternate code
|
||||
|
||||
By default, this code compiles for Little Endian machines.
|
||||
To compile for a Big Engian machine use:
|
||||
|
||||
```sh
|
||||
make alt
|
||||
```
|
||||
|
||||
Use `prog_be` as you would `prog` above.
|
||||
|
||||
## Judges' comments
|
||||
|
||||
Can you determine why this shows strange output for `./prog 128 128`
|
||||
and `./prog 128 128 128 128` but not `./prog 128 128 128`?
|
||||
|
||||
Can you find a pattern here?
|
||||
|
||||
What happens if you specify different numbers?
|
||||
|
||||
This tiny one-liner is a bit-twiddlers delight! It does all of the work
|
||||
without looping.
|
||||
@@ -43,10 +67,14 @@ Once you've figured out what happens with one set of constants, how can
|
||||
choosing new constants, but using the same computation generate a reversed
|
||||
result?
|
||||
|
||||
NOTE: this entry will dump core if you do not specify an argument.
|
||||
This code may be tested by:
|
||||
|
||||
```sh
|
||||
make test
|
||||
```
|
||||
|
||||
## Author's comments
|
||||
|
||||
## Author's comments:
|
||||
Invoke this with a single non-negative integer less than 256, and a useful transformation occurs.
|
||||
|
||||
### Rule 2-ish
|
||||
@@ -76,20 +104,26 @@ but you need to add `--include stdio.h --include stdlib.h` for the `printf`(3) a
|
||||
|
||||
On a little-endian machine:
|
||||
|
||||
clang -include stdio.h -include stdlib.h -Wall -Weverything -pedantic -DB=6945503773712347754LL -DI=5859838231191962459LL -DT=0 -DS=7 -o prog prog.c
|
||||
```sh
|
||||
clang -include stdio.h -include stdlib.h -Wall -Weverything -pedantic -DB=6945503773712347754LL -DI=5859838231191962459LL -DT=0 -DS=7 -o prog prog.c
|
||||
```
|
||||
|
||||
On a big-endian machine:
|
||||
|
||||
clang -include stdio.h -include stdlib.h -Wall -Weverything -pedantic -DB=7091606191627001958LL -DI=6006468689561538903LL -DT=1 -DS=0 -o prog_be prog.c
|
||||
```sh
|
||||
clang -include stdio.h -include stdlib.h -Wall -Weverything -pedantic -DB=7091606191627001958LL -DI=6006468689561538903LL -DT=1 -DS=0 -o prog_be prog.c
|
||||
```
|
||||
|
||||
You might be interested to compile it both ways on the same host, and try:
|
||||
|
||||
./prog 1; ./prog_be 1
|
||||
```sh
|
||||
./prog 1; ./prog_be 1
|
||||
```
|
||||
|
||||
## Copyright
|
||||
|
||||
-----------------------------------------------------------------------------------------------------
|
||||
(c) Copyright 1984-2020, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
|
||||
This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
|
||||
|
||||
[judges]: http://www.ioccc.org/judges.html
|
||||
[cc]: http://creativecommons.org/licenses/by-sa/3.0/
|
||||
-----------------------------------------------------------------------------------------------------
|
||||
Regular → Executable
+1
-1
@@ -1,4 +1,4 @@
|
||||
#!/bin/sh
|
||||
#!/usr/bin/env bash
|
||||
|
||||
prog="$1"
|
||||
: ${prog:=./prog_be}
|
||||
|
||||
Regular → Executable
+2
-2
@@ -1,7 +1,7 @@
|
||||
#!/bin/sh
|
||||
#!/usr/bin/env bash
|
||||
|
||||
prog="$1"
|
||||
: ${prog:=./prog}
|
||||
: ${prog:=./prog_le}
|
||||
|
||||
check_prog() {
|
||||
/bin/echo -n "$1 "; $prog $1
|
||||
Reference in new issue
Block a user