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macro: add PA_CLIP_SUB() for saturated subtraction
author
Lennart Poettering
<lennart@poettering.net>
Tue, 25 Aug 2009 23:41:34 +0000
(
01:41
+0200)
committer
Lennart Poettering
<lennart@poettering.net>
Tue, 25 Aug 2009 23:41:34 +0000
(
01:41
+0200)
src/pulsecore/macro.h
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diff --git
a/src/pulsecore/macro.h
b/src/pulsecore/macro.h
index
ce88c1b
..
87684ad
100644
(file)
--- a/
src/pulsecore/macro.h
+++ b/
src/pulsecore/macro.h
@@
-157,6
+157,17
@@
static inline size_t PA_PAGE_ALIGN(size_t l) {
#define PA_ROUND_DOWN(a, b) (((a) / (b)) * (b))
#endif
+#ifdef __GNUC__
+#define PA_CLIP_SUB(a, b) \
+ __extension__ ({ \
+ typeof(a) _a = (a); \
+ typeof(b) _b = (b); \
+ _a > _b ? _a - _b : 0; \
+ })
+#else
+#define PA_CLIP_SUB(a, b) ((a) > (b) ? (a) - (b) : 0)
+#endif
+
/* This type is not intended to be used in exported APIs! Use classic "int" there! */
#ifdef HAVE_STD_BOOL
typedef _Bool pa_bool_t;