diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/regex.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/regex.h b/lib/regex.h index b1ae24906..51857e559 100644 --- a/lib/regex.h +++ b/lib/regex.h @@ -322,7 +322,14 @@ extern reg_syntax_t re_syntax_options; # ifdef RE_DUP_MAX # undef RE_DUP_MAX # endif -/* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */ + +/* RE_DUP_MAX is 2**15 - 1 because an earlier implementation stored + the counter as a 2-byte signed integer. This is no longer true, so + RE_DUP_MAX could be increased to (INT_MAX / 10 - 1), or to + ((SIZE_MAX - 2) / 10 - 1) if _REGEX_LARGE_OFFSETS is defined. + However, there would be a huge performance problem if someone + actually used a pattern like a\{214748363\}, so RE_DUP_MAX retains + its historical value. */ # define RE_DUP_MAX (0x7fff) #endif /* defined __USE_GNU_REGEX */ |