| commit | dbc540c7a5827529a3f58befc9e5b81a31ec8fab | |
| author | René Scharfe <l.s.r@web.de> | |
| Thu, 29 Sep 2016 15:23:43 +0000 (29 17:23 +0200) | ||
| committer | Junio C Hamano <gitster@pobox.com> | |
| Thu, 29 Sep 2016 22:42:18 +0000 (29 15:42 -0700) | ||
| tree | cd2c485c62e68411e418616c6ca26923e24b3e1b | treesnapshot (tar.gz zip) |
| parent | 21f862b498925194f8f1ebe8203b7a7df756555b | commitdiff |
add QSORT
Add the macro QSORT, a convenient wrapper for qsort(3) that infers the
size of the array elements and supports the convention of initializing
empty arrays with a NULL pointer, which we use in some places.
Calling qsort(3) directly with a NULL pointer is undefined -- even with
an element count of zero -- and allows the compiler to optimize away any
following NULL checks. Using the macro avoids such surprises.
Add a semantic patch as well to demonstrate the macro's usage and to
automate the transformation of trivial cases.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Add the macro QSORT, a convenient wrapper for qsort(3) that infers the
size of the array elements and supports the convention of initializing
empty arrays with a NULL pointer, which we use in some places.
Calling qsort(3) directly with a NULL pointer is undefined -- even with
an element count of zero -- and allows the compiler to optimize away any
following NULL checks. Using the macro avoids such surprises.
Add a semantic patch as well to demonstrate the macro's usage and to
automate the transformation of trivial cases.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| contrib/coccinelle/qsort.cocci | [new file with mode: 0644] | blob |
| git-compat-util.h | diffblobblamehistory |