[PATCH 13/25] perf target: Simplify handling of strerror_r return

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

To deal with forwarding the strerror_r (GNU) return we need to check if
the returned value is the buffer we passed or maybe some constant
(unknown error), simplify that action by using scnprintf, that will do
all the buflen size checks, trimming if needed.

Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-d0ik6i5gjew56j0qphql28ou@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/target.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c
index e74c5963dc7a..a53603b27e52 100644
--- a/tools/perf/util/target.c
+++ b/tools/perf/util/target.c
@@ -123,11 +123,8 @@ int target__strerror(struct target *target, int errnum,
 	if (errnum >= 0) {
 		const char *err = strerror_r(errnum, buf, buflen);
 
-		if (err != buf) {
-			size_t len = strlen(err);
-			memcpy(buf, err, min(buflen - 1, len));
-			*(buf + min(buflen - 1, len)) = '\0';
-		}
+		if (err != buf)
+			scnprintf(buf, buflen, "%s", err);
 
 		return 0;
 	}
-- 
1.9.3

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