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>
diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 0a1adc1..5c7e318 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -29,3 +29,32 @@
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;
+}