1 files changed, 29 insertions, 0 deletions

diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 0a1adc1111fd..5c7e3185507c 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -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;
+}