Re: format failure on diff --side-by-side

[Frank Hemer]

Because the list blocks attachments, I post my test files uuencoded:

Revision 1.1:
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M"B`@("`@("`@(#QT<F%N<VQA=&EO;C[#A&YD97)U;F<@96EN<&9L96=E;CPO
M=')A;G-L871I;VX^"B`@("`@("`@(#QT<F%N<VQA=&EO;C[#A,.$;F1E<G5N
M9R!E:6YP9FQE9V5N/"]T<F%N<VQA=&EO;CX*("`@("`@("`@/'1R86YS;&%T
M:6]N/L.$PX3#A&YD97)U;F<@96EN<&9L96=E;CPO=')A;G-L871I;VX^"B`@
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M;CPO=')A;G-L871I;VX^"FQI;F4@,3$*;&EN92`Q,@IL:6YE(#$S"FQI;F4@
M,30*;&EN92`Q-0IA8F-D969G:&EJ:VQM;F]P<7)S='5V=WAY>D%"0T1%1D=(
M24I+3$U.3U!14E-455976%E:"FQI;F4@,3<*;&EN92`Q.`IL:6YE(#$Y"FQI
.;F4@,C`*;&EN92`R,0H`
`
end

Revision 1.2:
begin 644 /dev/stdout
M;&EN92`Q"FQI;F4@,@IL:6YE(#,*;&EN92`T"FQI;F4@-0H@("`@("`@("`\
M=')A;G-L871I;VX^06YD97)U;F<@96EN<&9L96=E;CPO=')A;G-L871I;VX^
M"B`@("`@("`@(#QT<F%N<VQA=&EO;CY!;F1E<G5N9R!E:6YP9FQE9V5N/"]T
M<F%N<VQA=&EO;CX*("`@("`@("`@/'1R86YS;&%T:6]N/D%!;F1E<G5N9R!E
M:6YP9FQE9V5N/"]T<F%N<VQA=&EO;CX*("`@("`@("`@/'1R86YS;&%T:6]N
M/D%!06YD97)U;F<@96EN<&9L96=E;CPO=')A;G-L871I;VX^"B`@("`@("`@
M(#QT<F%N<VQA=&EO;CY!04%!;F1E<G5N9R!E:6YP9FQE9V5N/"]T<F%N<VQA
M=&EO;CX*;&EN92`Q,0IL:6YE(#$R"FQI;F4@,3,*;&EN92`Q-`IL:6YE(#$U
M"F%B8V1E9F=H:6IK;&UN;W!Q<G-T=79W>'EZ04)#1$5&1T@Q2DM,34Y/4%%2
M4U155E=865H*;&EN92`Q-PIL:6YE(#$X"FQI;F4@,3D*;&EN92`R,`IL:6YE
$(#(Q"@``
`
end

The command:
cvs diff -N --side-by-side -t -W100 -r1.1 -r1.2 file.txt

The output:
begin 644 /dev/stdout
M26YD97@Z(&9I;&4N='AT"CT]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]
M/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T*4D-3(&9I
M;&4Z("]#5E-?4D]/5"]M;V1U;&5?8VAA=%]T97-T+V9I;&4N='AT+'8*<F5T
M<FEE=FEN9R!R979I<VEO;B`Q+C$*9&EF9B`M+7-I9&4M8GDM<VED92`M="`M
M5S$P,"`M<C$N,2!F:6QE+G1X=`IL:6YE(#$@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@;&EN92`Q"FQI;F4@,B`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("!L:6YE
M(#(*;&EN92`S("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@(&QI;F4@,PIL:6YE(#0@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@;&EN92`T"FQI;F4@-2`@("`@("`@
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M("`@("`@("`@("`@("`@("`@;&EN92`Q.0IL:6YE(#(P("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@;&EN92`R,`IL:6YE
M(#(Q("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
+("`@;&EN92`R,0H`
`
end

the problem is not the char-translation but the fact that diff 
--side-by-side should truncate lines to half of the given width but it seems 
that wide chars are completely ignored so the lines are longer for the amount 
of wide chars they hold.

Frank