perf tools: Enhance the matching of sub-commands abbreviations

We support short command 'rec*' for 'record' and 'rep*' for 'report' in
lots of sub-commands, but the matching is not quite strict currnetly.

It may be puzzling sometime, like we mis-type a 'recport' to report but
it will perform 'record' in fact without any message.

To fix this, add a check to ensure that the short cmd is valid prefix
of the real command.

Committer testing:

  [root@quaco ~]# perf c2c re sleep 1

   Usage: perf c2c {record|report}

      -v, --verbose         be more verbose (show counter open errors, etc)

  # perf c2c rec sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.038 MB perf.data (16 samples) ]
  # perf c2c recport sleep 1

   Usage: perf c2c {record|report}

      -v, --verbose         be more verbose (show counter open errors, etc)

  # perf c2c record sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.038 MB perf.data (15 samples) ]
  # perf c2c records sleep 1

   Usage: perf c2c {record|report}

      -v, --verbose         be more verbose (show counter open errors, etc)

  #

Signed-off-by: Wei Li <liwei391@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Rui Xiang <rui.xiang@huawei.com>
Link: http://lore.kernel.org/lkml/20220325092032.2956161-1-liwei391@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index fcf65a59bea2..9e435fd23503 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -20,6 +20,7 @@
 #include "util/symbol.h"
 #include "util/pmu.h"
 #include "util/pmu-hybrid.h"
+#include "util/string2.h"
 #include <linux/err.h>
 
 #define MEM_OPERATION_LOAD	0x1
@@ -496,9 +497,9 @@ int cmd_mem(int argc, const char **argv)
 			mem.input_name = "perf.data";
 	}
 
-	if (!strncmp(argv[0], "rec", 3))
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0]))
 		return __cmd_record(argc, argv, &mem);
-	else if (!strncmp(argv[0], "rep", 3))
+	else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
 		return report_events(argc, argv, &mem);
 	else
 		usage_with_options(mem_usage, mem_options);