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13 #Date: Sat, 31 Oct 98 00:16 CST
14 #From: dhw@gamgee.acad.emich.edu (David H. West)
15 #To: bug-gnu-utils@gnu.org
16 #Subject: gawk 3.0.3 bug report
18 #X-UIDL: 7474b825cff989adf38f13883d84fdd7
22 #System used: Linux, kernel 2.0.28, libc 5.4.33, AMD K5PR133 (i586 clone)
23 #Remark: There seems to be at least one bug shown by the demo below.
24 # There may also be a Dark Corner involving the value of NR in an
25 # END block, a topic on which the info file is silent. In gawk
26 # 3.0.3, NR often seems to have the least-surprise value in an
27 # END block, but sometimes it doesn't - see example below.
28 #Problem descr: the log below shows a case where:
29 # a) (this may be a red herring) the output of the gawk script
30 # is different depending on whether its input file is named on
31 # the command line or catted to stdin, without any use of the
32 # legitimate means which could produce this effect.
33 # b) NR is clearly getting clobbered; I have tried to simplify
34 # the 19-line script "awkerr1" below, but seemingly unrelated
35 # changes, like shortening constant strings which appear only in
36 # print statements, or removing unexecuted or irrelevant code,
37 # cause the clobbering to go away. Some previous (larger)
38 # versions of this code would clobber NR also when reading from
39 # stdin, but I thought you'd prefer a shorter example :-).
40 #Reproduce-By: using the gawk script "awkerr1", the contents of
41 # which appear in the transcript below as the output of the
42 # command "cat awkerr1". Comments following # were added
43 # to the transcript later as explanation.
44 #---------------------------------------------- Script started on Fri
45 #Oct 30 20:04:16 1998 chipmunk:/ram0# ls -l a1 awkerr1 -rw-r--r-- 1
46 #root root 2 Oct 30 18:42 a1 -rwxr-xr-x 1 root root
47 #389 Oct 30 19:54 awkerr1 chipmunk:/ram0# cat a1 #a1 contains
48 #one printable char and a newline a chipmunk:/ram0# od -c
\b \bxc a1
51 #0000002 chipmunk:/ram0# cat a1 | awkerr1 #no surprises here
52 #1 lines in 1 sec: 1 lines/sec; nlines=1 chipmunk:/ram0# awkerr1 a1 È
53 #lines in 1 sec: 1 lines/sec; nlines=1 #?! first char is an uppercase
54 #E-grave chipmunk:/ram0# awkerr1 a1 | od -N1 -xc 0000000 00c8
56 #0000001 chipmunk:/ram0# cat awkerr1 #the apparent ^M's are not
61 printf " : found\n"; lc[p " " w]++; rc[w " " n]++; }
65 /^/ {if(NR % 10 ==0)print "processing line " NR;
66 process($1); nlines++;
69 if(w)process(w); t=1; print NR " lines in " t " sec: " NR+0 " lines/sec; nlines=" nlines;
71 #chipmunk:/ram0# exit Script done on Fri Oct 30 20:07:31 1998
72 #---------------------------------------------
74 #-David West dhw@gamgee.acad.emich.edu