Commit c3ca8d44 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add perf_config_scan() 



To simplify getting a single config value, add a function to scan a config
variable.

Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
Reviewed-by: default avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220905073424.3971-2-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 016f2f98

tools/perf/util/config.c

+31 −0
Original line number Diff line number Diff line
@@ -908,3 +908,34 @@ void set_buildid_dir(const char *dir) 
	/* for communicating with external commands */

	setenv("PERF_BUILDID_DIR", buildid_dir, 1);

}



struct perf_config_scan_data {

	const char *name;

	const char *fmt;

	va_list args;

	int ret;

};



static int perf_config_scan_cb(const char *var, const char *value, void *data)

{

	struct perf_config_scan_data *d = data;



	if (!strcmp(var, d->name))

		d->ret = vsscanf(value, d->fmt, d->args);



	return 0;

}



int perf_config_scan(const char *name, const char *fmt, ...)

{

	struct perf_config_scan_data d = {

		.name = name,

		.fmt = fmt,

	};



	va_start(d.args, fmt);

	perf_config(perf_config_scan_cb, &d);

	va_end(d.args);



	return d.ret;

}

tools/perf/util/config.h

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ typedef int (*config_fn_t)(const char *, const char *, void *); 


int perf_default_config(const char *, const char *, void *);

int perf_config(config_fn_t fn, void *);

int perf_config_scan(const char *name, const char *fmt, ...) __scanf(2, 3);

int perf_config_set(struct perf_config_set *set,

		    config_fn_t fn, void *data);

int perf_config_int(int *dest, const char *, const char *);