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regex(3): Add support for \< and \> word delimiters

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Solaris and other OSs have support for \< and \> as word
delimiters in utilities like sed(1). These are useful to
have for general compatiblity with Solaris but should be
avoided for portability with other systems, including the
traditional BSDs.

Bump __FreeBSD_version as this is likely to affect some
userland utilities.

Reference:
https://www.illumos.org/issues/516

PR:		bin/153257
Obtained from:	Illumos
MFC after:	1 month
This commit is contained in:
Pedro F. Giffuni 2014-06-30 20:54:25 +00:00
parent b8a63d6df6
commit 6e28368366
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=268066
3 changed files with 26 additions and 3 deletions
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9
lib/libc/regex/re_format.7
View File

@ -36,7 +36,7 @@
.\" @(#)re_format.7 8.3 (Berkeley) 3/20/94
.\" $FreeBSD$
.\"
.Dd March 20, 1994
.Dd June 30, 2014
.Dt RE_FORMAT 7
.Os
.Sh NAME
@ -314,6 +314,13 @@ compatible with but not specified by
.St -p1003.2 ,
and should be used with
caution in software intended to be portable to other systems.
The additional word delimiters
.Ql \e<
and
.Ql \e>
are provided to ease compatibility with traditional
.Xr svr4 4
systems but are not portable and should be avoided.
.Pp
In the event that an RE could match more than one substring of a given
string,

18
lib/libc/regex/regcomp.c
View File

@ -412,7 +412,17 @@ p_ere_exp(struct parse *p)
case '\\':
(void)REQUIRE(MORE(), REG_EESCAPE);
wc = WGETNEXT();
ordinary(p, wc);
switch (wc) {
case '<':
EMIT(OBOW, 0);
break;
case '>':
EMIT(OEOW, 0);
break;
default:
ordinary(p, wc);
break;
}
break;
case '{': /* okay as ordinary except if digit follows */
(void)REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT);
@ -569,6 +579,12 @@ p_simp_re(struct parse *p,
case '[':
p_bracket(p);
break;
case BACKSL|'<':
EMIT(OBOW, 0);
break;
case BACKSL|'>':
EMIT(OEOW, 0);
break;
case BACKSL|'{':
SETERROR(REG_BADRPT);
break;

2
sys/sys/param.h
View File

@ -58,7 +58,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1100024 /* Master, propagated to newvers */
#define __FreeBSD_version 1100025 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,