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MINOR: tools: add a new macro DEFVAL() to provide a default argument

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This is like DEFZERO and DEFNULL, but this one allows to specify the
default value to be used as the first argument.
This commit is contained in:
Willy Tarreau 2024-11-28 15:11:46 +01:00
parent 295071007b
commit 6322c9fbbf
1 changed files with 7 additions and 2 deletions
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9
include/haproxy/tools-t.h
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@ -47,15 +47,20 @@
/* return the largest possible integer of type <ret>, with all bits set */ /* return the largest possible integer of type <ret>, with all bits set */
#define MAX_RANGE(ret) (~(typeof(ret))0) #define MAX_RANGE(ret) (~(typeof(ret))0)
/* DEFVAL() returns either the second argument as-is, or <def> if absent. This
* is for use in macros arguments.
*/
#define DEFVAL(_def,...) _FIRST_ARG(NULL, ##__VA_ARGS__, (_def))
/* DEFNULL() returns either the argument as-is, or NULL if absent. This is for /* DEFNULL() returns either the argument as-is, or NULL if absent. This is for
* use in macros arguments. * use in macros arguments.
*/ */
#define DEFNULL(...) _FIRST_ARG(NULL, ##__VA_ARGS__, NULL) #define DEFNULL(...) DEFVAL(NULL, ##__VA_ARGS__)
/* DEFZERO() returns either the argument as-is, or 0 if absent. This is for /* DEFZERO() returns either the argument as-is, or 0 if absent. This is for
* use in macros arguments. * use in macros arguments.
*/ */
#define DEFZERO(...) _FIRST_ARG(NULL, ##__VA_ARGS__, 0) #define DEFZERO(...) DEFVAL(0, ##__VA_ARGS__)
#define _FIRST_ARG(a, b, ...) b #define _FIRST_ARG(a, b, ...) b