diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2016-08-01 20:02:30 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-08-02 16:33:26 -0300 |
| commit | 820d12b70f91a19eb4a3152b9dd4ea9aee194a36 (patch) | |
| tree | 1d5ef72470b761193adf8147826943390316ad46 /tools | |
| parent | 98c032967a299ee4bf14ef19eded02b65df32e6f (diff) | |
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/include/linux/bitmap.h | 10 | ||||
| -rw-r--r-- | tools/lib/bitmap.c | 29 |
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; +} |