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author | Szabolcs Nagy <nsz@port70.net> | 2015-04-18 15:51:16 +0000 |
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committer | Rich Felker <dalias@aerifal.cx> | 2016-01-30 20:53:04 -0500 |
commit | 7eaa76fc2e7993582989d3838b1ac32dd8abac09 (patch) | |
tree | 8d3c0772c1c85b0ba9017fbf919a654a821d8b2d /dist/config.mak | |
parent | a8cc2253843e30dfbdf0bb2954439d9f2b2e8704 (diff) | |
download | musl-7eaa76fc2e7993582989d3838b1ac32dd8abac09.tar.gz musl-7eaa76fc2e7993582989d3838b1ac32dd8abac09.tar.xz musl-7eaa76fc2e7993582989d3838b1ac32dd8abac09.zip |
regex: reject repetitions in some cases with REG_BADRPT
Previously repetitions were accepted after empty expressions like in (*|?)|{2}, but in BRE the handling of * and \{\} were not consistent: they were accepted as literals in some cases and repetitions in others. It is better to treat repetitions after an empty expression as an error (this is allowed by the standard, and glibc mostly does the same). This is hard to do consistently with the current logic so the new rule is: Reject repetitions after empty expressions, except after assertions ^*, $? and empty groups ()+ and never treat them as literals. Empty alternation (|a) is undefined by the standard, but it can be useful so that should be accepted.
Diffstat (limited to 'dist/config.mak')
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