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tools lib: Add bitmap_scnprintf function

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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:
Jiri Olsa 2016-08-01 20:02:30 +02:00 committed by Arnaldo Carvalho de Melo
parent 98c032967a
commit 820d12b70f
2 changed files with 39 additions and 0 deletions
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10
tools/include/linux/bitmap.h
View file

@ -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
tools/lib/bitmap.c
View file

@ -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;
}