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authorJim Meyering <meyering@redhat.com>2008-01-31 17:26:32 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-02-22 22:14:40 (GMT)
commit8e0f70033b2bd1679a6e5971978fdc3ee09bdb72 (patch)
tree20da93fcc3557caaeecf8ca807b9ec2877fd6d25 /xdiff-interface.c
parent22c430ad8468133fa5ed46d8407d7f4cde2c4a0e (diff)
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Avoid unnecessary "if-before-free" tests.
This change removes all obvious useless if-before-free tests. E.g., it replaces code like this: if (some_expression) free (some_expression); with the now-equivalent: free (some_expression); It is equivalent not just because POSIX has required free(NULL) to work for a long time, but simply because it has worked for so long that no reasonable porting target fails the test. Here's some evidence from nearly 1.5 years ago: http://www.winehq.org/pipermail/wine-patches/2006-October/031544.html FYI, the change below was prepared by running the following: git ls-files -z | xargs -0 \ perl -0x3b -pi -e \ 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\(\s*\1\s*\))/$2/s' Note however, that it doesn't handle brace-enclosed blocks like "if (x) { free (x); }". But that's ok, since there were none like that in git sources. Beware: if you do use the above snippet, note that it can produce syntactically invalid C code. That happens when the affected "if"-statement has a matching "else". E.g., it would transform this if (x) free (x); else foo (); into this: free (x); else foo (); There were none of those here, either. If you're interested in automating detection of the useless tests, you might like the useless-if-before-free script in gnulib: [it *does* detect brace-enclosed free statements, and has a --name=S option to make it detect free-like functions with different names] http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=build-aux/useless-if-before-free Addendum: Remove one more (in imap-send.c), spotted by Jean-Luc Herren <jlh@gmx.ch>. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'xdiff-interface.c')
-rw-r--r--xdiff-interface.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 4b8e5cc..bba2364 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -233,8 +233,7 @@ void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value)
expression = value;
if (regcomp(&reg->re, expression, 0))
die("Invalid regexp to look for hunk header: %s", expression);
- if (buffer)
- free(buffer);
+ free(buffer);
value = ep + 1;
}
}