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MINOR: tools: add a DEFNULL() macro to use NULL for empty args

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It's sometimes convenient for debugging macros not to be forced to
explicitly pass NULL in an unused argument. This macro does this, it
replaces a missing arg with NULL.
This commit is contained in:
Willy Tarreau 2019-08-19 17:39:33 +02:00
parent 9bead8c7f5
commit 32c24552e4
1 changed files with 6 additions and 0 deletions
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6
include/common/standard.h
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@ -61,6 +61,12 @@
* power of 2, and 0 otherwise */
#define POWEROF2(x) (((x) & ((x)-1)) == 0)
/* DEFNULL() returns either the argument as-is, or NULL if absent. This is for
* use in macros arguments.
*/
#define DEFNULL(...) _FIRST_ARG(NULL, ##__VA_ARGS__, NULL)
#define _FIRST_ARG(a, b, ...) b
/* operators to compare values. They're ordered that way so that the lowest bit
* serves as a negation for the test and contains all tests that are not equal.
*/