mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
tools lib: Add bitmap_scnprintf function
Add support to print bitmap list. Code mostly taken from kernel's bitmap_list_string. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1470074555-24889-3-git-send-email-jolsa@kernel.org [ s/bitmap_snprintf/bitmap_scnprintf/g as it is a scnprintf wrapper, having the same semantics wrt return value ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
98c032967a
commit
820d12b70f
|
@ -75,4 +75,14 @@ static inline unsigned long *bitmap_alloc(int nbits)
|
|||
return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
|
||||
}
|
||||
|
||||
/*
|
||||
* bitmap_scnprintf - print bitmap list into buffer
|
||||
* @bitmap: bitmap
|
||||
* @nbits: size of bitmap
|
||||
* @buf: buffer to store output
|
||||
* @size: size of @buf
|
||||
*/
|
||||
size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
|
||||
char *buf, size_t size);
|
||||
|
||||
#endif /* _PERF_BITOPS_H */
|
||||
|
|
|
@ -29,3 +29,32 @@ void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
|
|||
for (k = 0; k < nr; k++)
|
||||
dst[k] = bitmap1[k] | bitmap2[k];
|
||||
}
|
||||
|
||||
size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
|
||||
char *buf, size_t size)
|
||||
{
|
||||
/* current bit is 'cur', most recently seen range is [rbot, rtop] */
|
||||
int cur, rbot, rtop;
|
||||
bool first = true;
|
||||
size_t ret = 0;
|
||||
|
||||
rbot = cur = find_first_bit(bitmap, nbits);
|
||||
while (cur < nbits) {
|
||||
rtop = cur;
|
||||
cur = find_next_bit(bitmap, nbits, cur + 1);
|
||||
if (cur < nbits && cur <= rtop + 1)
|
||||
continue;
|
||||
|
||||
if (!first)
|
||||
ret += scnprintf(buf + ret, size - ret, ",");
|
||||
|
||||
first = false;
|
||||
|
||||
ret += scnprintf(buf + ret, size - ret, "%d", rbot);
|
||||
if (rbot < rtop)
|
||||
ret += scnprintf(buf + ret, size - ret, "-%d", rtop);
|
||||
|
||||
rbot = cur;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue