tools lib: Add bitmap_scnprintf function (820d12b7) · Commits · 戴 / test

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 */

+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;
		}