aszlig 1964b0c1b1 xkbvalidate: Don't rely on GNU extensions ... The only reason why I was using _GNU_SOURCE was because of vasprintf(), so getting rid of that extension should make the source way more portable. When using vsnprintf() with a null pointer for the output buffer and a size of 0, I wasn't quite sure whether this would be undefined behaviour, so I looked it up in the C11 standard. In section 7.21.6.5, it explicitly mentions this case, so we're lucky: If n is zero, nothing is written, and s may be a null pointer. Additionally, section 7.21.6.12 writes the following about vsnprintf(): The vsnprintf function does not invoke the va_end macro. So to be sure to avoid undefined behaviour I subsequently added the corresponding va_end() calls. With this, the platforms attribute is now "unix", because the program should now even run on OS X, even though it usually wouldn't be needed. Signed-off-by: aszlig <aszlig@nix.build>		2019-08-15 00:59:58 +02:00
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default.nix	xkbvalidate: Don't rely on GNU extensions	2019-08-15 00:59:58 +02:00
xkbvalidate.c	xkbvalidate: Don't rely on GNU extensions	2019-08-15 00:59:58 +02:00