musl - musl - an implementation of the standard library for Linux-based systems

musl - an implementation of the standard library for Linux-based systems

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author	Szabolcs Nagy <nsz@port70.net>	2016年02月29日 16:36:25 +0000
committer	Rich Felker <dalias@aerifal.cx>	2016年03月02日 00:47:22 -0500
commit	29b13575376509bb21539711f30c1deaf0823033 (patch)
tree	a562ad6c465f6f33d0cb534d6a80a5e85bd681b3 /src/regex/regcomp.c
parent	39ea71fb8afddda879a1999f2a203dfdaf57a639 (diff)
download	musl-29b13575376509bb21539711f30c1deaf0823033.tar.gz

fix ^* at the start of a complete BRE

This is a workaround to treat * as literal * at the start of a BRE. Ideally ^ would be treated as an anchor at the start of any BRE subexpression and similarly $ would be an anchor at the end of any subexpression. This is not required by the standard and hard to do with the current code, but it's the existing practice. If it is changed, * should be treated as literal after such anchor as well.

Diffstat (limited to 'src/regex/regcomp.c')

-rw-r--r--

src/regex/regcomp.c

1 files changed, 4 insertions, 0 deletions

diff --git a/src/regex/regcomp.c b/src/regex/regcomp.c
index 7a2864cd..5fad98b3 100644
--- a/src/regex/regcomp.c
+++ b/src/regex/regcomp.c

@@ -994,6 +994,10 @@ static reg_errcode_t tre_parse(tre_parse_ctx_t *ctx)

if (*s=='\\')

s++;

+ /* handle ^* at the start of a complete BRE. */

+ if (!ere && s==ctx->re+1 && s[-1]=='^')

+ break;

/* extension: multiple consecutive *+?{,} is unspecified,

but (a+)+ has to be supported so accepting a++ makes

sense, note however that the RE_DUP_MAX limit can be

generated by cgit v1.2.1 (git 2.18.0) at 2025年09月05日 19:49:24 +0000