From 8e0f70033b2bd1679a6e5971978fdc3ee09bdb72 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Thu, 31 Jan 2008 18:26:32 +0100 Subject: 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 . Signed-off-by: Jim Meyering Signed-off-by: Junio C Hamano --- sha1_name.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'sha1_name.c') diff --git a/sha1_name.c b/sha1_name.c index c2805e736..9d088cc2c 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -625,8 +625,7 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1) commit = pop_most_recent_commit(&list, ONELINE_SEEN); if (!parse_object(commit->object.sha1)) continue; - if (temp_commit_buffer) - free(temp_commit_buffer); + free(temp_commit_buffer); if (commit->buffer) p = commit->buffer; else { @@ -643,8 +642,7 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1) break; } } - if (temp_commit_buffer) - free(temp_commit_buffer); + free(temp_commit_buffer); free_commit_list(list); for (l = backup; l; l = l->next) clear_commit_marks(l->item, ONELINE_SEEN); -- cgit v1.2.1