From 2f8952250a84313b74f96abb7b035874854cf202 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Wed, 21 Sep 2016 20:24:04 +0200 Subject: regex: add regexec_buf() that can work on a non NUL-terminated string We just introduced a test that demonstrates that our sloppy use of regexec() on a mmap()ed area can result in incorrect results or even hard crashes. So what we need to fix this is a function that calls regexec() on a length-delimited, rather than a NUL-terminated, string. Happily, there is an extension to regexec() introduced by the NetBSD project and present in all major regex implementation including Linux', MacOSX' and the one Git includes in compat/regex/: by using the (non-POSIX) REG_STARTEND flag, it is possible to tell the regexec() function that it should only look at the offsets between pmatch[0].rm_so and pmatch[0].rm_eo. That is exactly what we need. Since support for REG_STARTEND is so widespread by now, let's just introduce a helper function that always uses it, and tell people on a platform whose regex library does not support it to use the one from our compat/regex/ directory. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index e11e626d05..c6dc42d067 100644 --- a/Makefile +++ b/Makefile @@ -296,7 +296,8 @@ all:: # Define USE_NED_ALLOCATOR if you want to replace the platforms default # memory allocators with the nedmalloc allocator written by Niall Douglas. # -# Define NO_REGEX if you have no or inferior regex support in your C library. +# Define NO_REGEX if your C library lacks regex support with REG_STARTEND +# feature. # # Define HAVE_DEV_TTY if your system can open /dev/tty to interact with the # user. -- cgit v1.2.3