find-first-fail: Bug if multiple options fixed.
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18
Makefile
18
Makefile
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@ -1,14 +1,14 @@
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CMD = binsearch blink 2grep 2search burncpu drac duplicate-packets em \
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encdir field forever fxkill G gitnext gitundo goodpasswd \
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histogram mtrr mirrorpdf neno off parsort pdfman pidcmd \
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pidtree plotpipe puniq ramusage rand rclean rina rn rrm \
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seekmaniac shython sound-reload splitvideo stdout swapout T \
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teetime timestamp tracefile transpose upsidedown vid \
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CMD = blink 2grep 2search burncpu drac duplicate-packets em encdir \
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field find-first-fail forever fxkill G gitnext gitundo \
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goodpasswd histogram mtrr mirrorpdf neno off parsort pdfman \
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pidcmd pidtree plotpipe puniq ramusage rand rclean rina rn \
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rrm seekmaniac shython sound-reload splitvideo stdout swapout \
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T teetime timestamp tracefile transpose upsidedown vid \
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w4it-for-port-open whitehash wifi-reload wssh ytv yyyymmdd
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all: binsearch/binsearch.1 blink/blink.1 2search/2grep.1 \
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2search/2search.1 burncpu/burncpu.1 drac/drac.1 \
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encdir/encdir.1 field/field.1 G/G.1 gitnext/gitnext.1 \
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all: blink/blink.1 2search/2grep.1 2search/2search.1 \
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burncpu/burncpu.1 drac/drac.1 encdir/encdir.1 field/field.1 \
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find-first-fail/find-first-fail.1 G/G.1 gitnext/gitnext.1 \
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gitundo/gitundo.1 goodpasswd/goodpasswd.1 \
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histogram/histogram.1 mirrorpdf/mirrorpdf.1 neno/neno.1 \
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off/off.1 parsort/parsort.1 pdfman/pdfman.1 pidcmd/pidcmd.1 \
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@ -18,12 +18,13 @@ B<find-first-fail> [-2] [-q] [-s I<start>] I<command>
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B<find-first-fail> runs I<command> with a single number. It returns highest
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value that I<command> succeeds for.
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It finds the value by first testing the value 1. As long as the value
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succeeds, the value is doubled. When the value fails, B<find-first-fail>
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does a binary search between this value and the previous value.
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It finds the value by first testing the I<start> value (which defaults
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to 1). As long as the value succeeds, the value is doubled. When the
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value fails, B<find-first-fail> does a binary search between this
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value and the previous value.
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If the value 1 fails, B<find-first-fail> instead searches for the highest
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value that I<command> fails for.
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If the I<start> value fails, B<find-first-fail> instead searches for
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the highest value that I<command> fails for.
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=head1 OPTIONS
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@ -43,6 +44,10 @@ Quiet. Ignore output from I<command>.
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Start searching from the value I<start>. Normally searching will start from the value 1.
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=item B<-v>
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Verbose. Show the commands being run.
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=back
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@ -89,6 +94,20 @@ Complex commands can also be run:
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find-first-fail -v perl -e 'exit(shift > 129)'
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=head2 Find the second limit of a program
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Assume you have a program that is OK in the range 123..12345. How do
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you find the limits?
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myprog() { perl -e '$a=shift;if($a <= 123) { exit 0; }
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else { exit ($a <= 12345) }' "$@"; }
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export -f myprog
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# Finds 123
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find-first-fail myprog
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# Finds 12345
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find-first-fail -s 200 myprog
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=head1 AUTHOR
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Copyright (C) 2020 Ole Tange,
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@ -121,15 +140,16 @@ B<eval>(1)
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find-first-fail() {
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_find-first-fail() {
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low=$1
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high=$2
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local low=$1
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local high=$2
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# echo $low-$high
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if [ $low -gt $(($high - 2)) ]; then
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echo $low
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return
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fi
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shift
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shift
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middle=$(( ( $low + $high ) / 2 ))
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local middle=$(( ( $low + $high ) / 2 ))
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if _run $low $middle "$@" ; then
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low=$middle
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else
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@ -165,24 +185,25 @@ find-first-fail() {
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eval "$not" _inner_run "$quiet"
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}
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quiet=""
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opt2=false
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verbose=false
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start=1
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local opt2=false
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local quiet=""
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local start=1
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local verbose=false
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# Parse and remove options
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while getopts "2vqs:" options; do
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while getopts "2qs:v" options; do
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case "${options}" in
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(2) opt2=true;;
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(q) quiet=">/dev/null 2>/dev/null";;
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(s) start="$OPTARG";;
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(v) verbose=true;;
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(s) start="$2";;
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(-) break;;
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esac
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done
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shift $(( OPTIND - 1))
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# If function(1) = false: run 'not function()' instead
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local not
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if _run "$start" "$start" "$@" ; then
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not=''
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else
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@ -192,7 +213,8 @@ find-first-fail() {
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# exponential search for the first value that is false
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# low = previous value (function($low) == true)
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# high = low * 2 (function($high) == false)
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high=$start
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local high=$start
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local low
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while _run $start $high "$@" ; do
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low=$high
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high=$(( $high*2 ))
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@ -207,7 +229,7 @@ find-first-fail() {
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# Search low..high
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# echo "low: $low high: $high not: $not"
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_find-first-fail $low $high "$@" 2>/dev/null
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echo $low
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unset low high start
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}
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if [ -z "$*" ] ; then
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38
find-first-fail/testsuite
Normal file
38
find-first-fail/testsuite
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@ -0,0 +1,38 @@
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#!/bin/bash
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test_unexported_function() {
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myprog() { perl -e 'exit (shift > 12345678)' "$@"; }
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# myprog is a function, so source find-first-fail first
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. `which find-first-fail`
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find-first-fail myprog
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}
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test_exported_function() {
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myprog() { perl -e 'exit (shift > 12345678)' "$@"; }
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# myprog is an exported function
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export -f myprog
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find-first-fail myprog
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}
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test_startvalue() {
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# exit value changes at 100 and 12345678
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myprog() { perl -e '$a=shift;if($a <= 123) { exit 0; }
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else { exit ($a <= 12345678) }' "$@"; }
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export -f myprog
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# Finds 123
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find-first-fail myprog
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# Finds 12345678
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find-first-fail -s 200 myprog
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}
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test_s_v_12() {
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# Multiple options
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myprog() { perl -e 'exit (shift > 12)' "$@"; }
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export -f myprog
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find-first-fail -v -s 10 myprog
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find-first-fail -v -q -s 10 myprog
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}
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export -f $(compgen -A function | grep test_)
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compgen -A function | grep test_ | LC_ALL=C sort |
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parallel --timeout 1000% --tag -k --joblog /tmp/jl-`basename $0` '{} 2>&1'
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