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 <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Hanjun Guo <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Rui Xiang <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-c2c.c

···
 #include "../perf.h"
 #include "pmu.h"
 #include "pmu-hybrid.h"
+#include "string2.h"
 
 struct c2c_hists {
 	struct hists		hists;
···
 	if (!argc)
 		usage_with_options(c2c_usage, c2c_options);
 
-	if (!strncmp(argv[0], "rec", 3)) {
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		return perf_c2c__record(argc, argv);
-	} else if (!strncmp(argv[0], "rep", 3)) {
+	} else if (strlen(argv[0]) > 2 && strstarts("report", argv[0])) {
 		return perf_c2c__report(argc, argv);
 	} else {
 		usage_with_options(c2c_usage, c2c_options);

tools/perf/builtin-kmem.c

···
 			kmem_page = 1;
 	}
 
-	if (!strncmp(argv[0], "rec", 3)) {
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		symbol__init(NULL);
 		return __cmd_record(argc, argv);
 	}

tools/perf/builtin-kvm.c

···
 #include "util/ordered-events.h"
 #include "util/kvm-stat.h"
 #include "ui/ui.h"
+#include "util/string2.h"
 
 #include <sys/prctl.h>
 #ifdef HAVE_TIMERFD_SUPPORT
···
 		goto perf_stat;
 	}
 
-	if (!strncmp(argv[1], "rec", 3))
+	if (strlen(argv[1]) > 2 && strstarts("record", argv[1]))
 		return kvm_events_record(&kvm, argc - 1, argv + 1);
 
-	if (!strncmp(argv[1], "rep", 3))
+	if (strlen(argv[1]) > 2 && strstarts("report", argv[1]))
 		return kvm_events_report(&kvm, argc - 1 , argv + 1);
 
 #ifdef HAVE_TIMERFD_SUPPORT
···
 		}
 	}
 
-	if (!strncmp(argv[0], "rec", 3))
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0]))
 		return __cmd_record(file_name, argc, argv);
-	else if (!strncmp(argv[0], "rep", 3))
+	else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
 		return __cmd_report(file_name, argc, argv);
 	else if (!strncmp(argv[0], "diff", 4))
 		return cmd_diff(argc, argv);

tools/perf/builtin-lock.c

···
 #include "util/session.h"
 #include "util/tool.h"
 #include "util/data.h"
+#include "util/string2.h"
 
 #include <sys/types.h>
 #include <sys/prctl.h>
···
 	if (!argc)
 		usage_with_options(lock_usage, lock_options);
 
-	if (!strncmp(argv[0], "rec", 3)) {
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		return __cmd_record(argc, argv);
-	} else if (!strncmp(argv[0], "report", 6)) {
+	} else if (strlen(argv[0]) > 2 && strstarts("report", argv[0])) {
 		trace_handler = &report_lock_ops;
 		if (argc) {
 			argc = parse_options(argc, argv,

tools/perf/builtin-mem.c

···
 #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
···
 			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);

tools/perf/builtin-sched.c

···
 	if (!strcmp(argv[0], "script"))
 		return cmd_script(argc, argv);
 
-	if (!strncmp(argv[0], "rec", 3)) {
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		return __cmd_record(argc, argv);
 	} else if (!strncmp(argv[0], "lat", 3)) {
 		sched.tp_handler = &lat_ops;
···
 		sched.tp_handler = &map_ops;
 		setup_sorting(&sched, latency_options, latency_usage);
 		return perf_sched__map(&sched);
-	} else if (!strncmp(argv[0], "rep", 3)) {
+	} else if (strlen(argv[0]) > 2 && strstarts("replay", argv[0])) {
 		sched.tp_handler = &replay_ops;
 		if (argc) {
 			argc = parse_options(argc, argv, replay_options, replay_usage, 0);

tools/perf/builtin-script.c

···
 	if (symbol__validate_sym_arguments())
 		return -1;
 
-	if (argc > 1 && !strncmp(argv[0], "rec", strlen("rec"))) {
+	if (argc > 1 && strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		rec_script_path = get_script_path(argv[1], RECORD_SUFFIX);
 		if (!rec_script_path)
 			return cmd_record(argc, argv);
 	}
 
-	if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
+	if (argc > 1 && strlen(argv[0]) > 2 && strstarts("report", argv[0])) {
 		rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 		if (!rep_script_path) {
 			fprintf(stderr,

tools/perf/builtin-stat.c

···
 	} else
 		stat_config.csv_sep = DEFAULT_SEPARATOR;
 
-	if (argc && !strncmp(argv[0], "rec", 3)) {
+	if (argc && strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		argc = __cmd_record(argc, argv);
 		if (argc < 0)
 			return -1;
-	} else if (argc && !strncmp(argv[0], "rep", 3))
+	} else if (argc && strlen(argv[0]) > 2 && strstarts("report", argv[0]))
 		return __cmd_report(argc, argv);
 
 	interval = stat_config.interval;

tools/perf/builtin-timechart.c

···
 #include "util/tool.h"
 #include "util/data.h"
 #include "util/debug.h"
+#include "util/string2.h"
 #include <linux/err.h>
 
 #ifdef LACKS_OPEN_MEMSTREAM_PROTOTYPE
···
 		return -1;
 	}
 
-	if (argc && !strncmp(argv[0], "rec", 3)) {
+	if (argc && strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
 		argc = parse_options(argc, argv, timechart_record_options,
 				     timechart_record_usage,
 				     PARSE_OPT_STOP_AT_NON_OPTION);