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Commit 820d12b7 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

tools lib: Add bitmap_scnprintf function 



Add support to print bitmap list. Code mostly taken from kernel's
bitmap_list_string.

Signed-off-by: default avatarJiri 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 98c03296

tools/include/linux/bitmap.h

+10 −0
Original line number Diff line number Diff line
@@ -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 */

tools/lib/bitmap.c

+29 −0
Original line number Diff line number Diff line
@@ -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;

}