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authorRené Scharfe <l.s.r@web.de>2016-09-29 15:23:43 (GMT)
committerJunio C Hamano <gitster@pobox.com>2016-09-29 22:42:18 (GMT)
commitdbc540c7a5827529a3f58befc9e5b81a31ec8fab (patch)
treecd2c485c62e68411e418616c6ca26923e24b3e1b /string-list.c
parent21f862b498925194f8f1ebe8203b7a7df756555b (diff)
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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>
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