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perf tools: Add perf_config_scan()

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

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Adrian 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-09-05 10:34:19 +03:00 committed by Arnaldo Carvalho de Melo
parent 016f2f9821
commit c3ca8d4418
2 changed files with 32 additions and 0 deletions
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31
tools/perf/util/config.c
View File

@ -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;
}

1
tools/perf/util/config.h
View File

@ -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 *);