view tests/tac.test @ 1613:96aa7ec74936 draft

Fix yet another sed bug. The s/// command would copy the \ of substitutions before deciding what to do with them (generally overwriting the \ with the new data). When the substitution was A) at the very end of the new string, B) resolved to nothing, it could leave a trailing \ that didn't belong there and didn't get overwritten because the "copy trailing data" part that copies the original string's null terminator already happened before the \ overwrote it. The ghostwheel() function restarts regexes after embedded NUL bytes, but if the string it's passed is _longer_ than the length it's told then it gets confused (and it means we're off the end of our allocation so segfaults are likely). Fix: test for \ first and move the "copy byte" logic into an else case.
author Rob Landley <rob@landley.net>
date Mon, 15 Dec 2014 03:34:55 -0600
parents 8700cbe1cb29
children
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#!/bin/bash

[ -f testing.sh ] && . testing.sh

#testing "name" "command" "result" "infile" "stdin"


echo -e "one-A\none-B" > file1 
echo -e "two-A\ntwo-B" > file2
testing "tac" "tac && echo yes" "one-B\none-A\nyes\n" "" "one-A\none-B\n"
testing "tac -" "tac - && echo yes" "one-B\none-A\nyes\n" "" "one-A\none-B\n"
testing "tac file1 file2" "tac file1 file2" "one-B\none-A\ntwo-B\ntwo-A\n"  "" ""
testing "tac - file"      "tac - file1"     "zero-B\nzero-A\none-B\none-A\n" "" "zero-A\nzero-B\n"
testing "tac file -"      "tac file1 -"     "one-B\none-A\nzero-B\nzero-A\n" "" "zero-A\nzero-B\n"

testing "tac file1 notfound file2" \
        "tac file1 notfound file2 2>stderr && echo ok ; tac stderr; rm stderr" \
        "one-B\none-A\ntwo-B\ntwo-A\ntac: notfound: No such file or directory\n" "" ""

testing "tac no trailing newline" "tac -" "defabc\n" "" "abc\ndef"

# xputs used by tac does not propagate this error condition properly. 
#testing "tac > /dev/full" \
#        "tac - > /dev/full 2>stderr && echo ok; cat stderr; rm stderr" \
#        "tac: write: No space left on device\n" "" "zero\n"

# 

rm file1 file2