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>

2 files changed, 39 insertions, 0 deletions

diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 60c44b615902..1cdded0041a8 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -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 */
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;
+}