https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192108
Bug ID: 192108
Summary: [patch] sed(1) bug in "addr1,+N" ranges
Product: Base System
Version: 9.2-STABLE
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 144962
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=144962&action=edit
Proposed patch for review
There is a bug in "addr1,+N" ranges in the case of last input line, let's try:
# seq 1 4 | sed -ne '1,+0p'
1
# seq 1 4 | sed -ne '1,+1p'
1
2
# seq 1 4 | sed -ne '1,+2p'
1
2
3
4 <--- This line should not be printed!!!
# seq 1 4 | sed -ne '1,+3p'
1
2
3
4
The reason is that in case of AT_RELLINE, lastline()'s TRUE in MATCH() is taken
before the test for relative range next (process.c:291-297):
...
if (MATCH(cp->a2)) {
cp->startline = 0;
lastaddr = 1;
r = 1;
} else if (linenum - cp->startline <= cp->a2->u.l)
r = 1;
else if ((cp->a2->type == AT_LINE &&
...
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