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macro: add PA_CLIP_SUB() for saturated subtraction

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Lennart Poettering 2009-08-26 01:41:34 +02:00
parent 457b973ba6
commit 827ae07c1e
1 changed files with 11 additions and 0 deletions
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11
src/pulsecore/macro.h
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@ -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;