[PATCH v10 21/22] perf config: normalize a value depending on default type of it

[Taeung Song <treeze.taeung@gmail.com>]

Whether or not user mis-type wrong data type to set config,
normalize the value. If a config user enter isn't contained
in default configs, just pass as it is.
For the examples,

   # perf config report.queue-size=1M
   # perf config report.queue-size
   report.queue-size=1048576

Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/builtin-config.c | 54 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 89b12e9..388e95b 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -351,6 +351,54 @@ static int show_spec_config(struct list_head *sections,
 	return -1;
 }
 
+static char *normalize_value(const char *section_name, const char *name, const char *value)
+{
+	int i, ret = 0;
+	char *endptr;
+	char key[BUFSIZ];
+	char *normalized;
+
+	scnprintf(key, sizeof(key), "%s.%s", section_name, name);
+	for (i = 0; default_configs[i].type != CONFIG_END; i++) {
+		struct config_item *config = &default_configs[i];
+
+		if (!strcmp(config->section, section_name) &&
+		    !strcmp(config->name, name)) {
+			if (config->type == CONFIG_TYPE_BOOL)
+				ret = asprintf(&normalized, "%s",
+					       perf_config_bool(key, value) ? "true" : "false");
+			else if (config->type == CONFIG_TYPE_INT ||
+				 config->type == CONFIG_TYPE_LONG)
+				ret = asprintf(&normalized, "%d",
+					       perf_config_int(key, value));
+			else if (config->type == CONFIG_TYPE_U64)
+				ret = asprintf(&normalized, "%"PRId64,
+					       perf_config_u64(key, value));
+			else if (config->type == CONFIG_TYPE_FLOAT)
+				ret = asprintf(&normalized, "%f",
+					       strtof(value, &endptr));
+			else if (config->type == CONFIG_TYPE_DOUBLE)
+				ret = asprintf(&normalized, "%f",
+					       strtod(value, &endptr));
+			else
+				ret = asprintf(&normalized, "%s", value);
+
+			if (ret < 0)
+				return NULL;
+
+			return normalized;
+		}
+	}
+
+	normalized = strdup(value);
+	if (!normalized) {
+		pr_err("%s: strdup failed\n", __func__);
+		return NULL;
+	}
+
+	return normalized;
+}
+
 static int set_config(struct list_head *sections, const char *config_file_name,
 		      const char *section_name, const char *name, char *value)
 {
@@ -359,11 +407,7 @@ static int set_config(struct list_head *sections, const char *config_file_name,
 
 	find_config(sections, &section, &element, section_name, name);
 	if (value != NULL) {
-		value = strdup(value);
-		if (!value) {
-			pr_err("%s: strdup failed\n", __func__);
-			return -1;
-		}
+		value = normalize_value(section_name, name, value);
 
 		/* if there isn't existent section, add a new section */
 		if (!section) {
-- 
1.9.1