conf: add conf_get_float (#1198)

include/re_conf.h

@@ -16,6 +16,7 @@ int conf_get_str(const struct conf *conf, const char *name, char *str,
 		 size_t size);
 int conf_get_u32(const struct conf *conf, const char *name, uint32_t *num);
 int conf_get_i32(const struct conf *conf, const char *name, int32_t *num);
+int conf_get_float(const struct conf *conf, const char *name, double *num);
 int conf_get_bool(const struct conf *conf, const char *name, bool *val);
 int conf_apply(const struct conf *conf, const char *name,
 	       conf_h *ch, void *arg);

src/conf/conf.c

@@ -252,6 +252,33 @@ int conf_get_i32(const struct conf *conf, const char *name, int32_t *num)
 }
 
 
+/**
+ * Get the numeric floating point value of a configuration item
+ *
+ * @param conf Configuration object
+ * @param name Name of config item key
+ * @param num  Returned numeric value of config item, if present
+ *
+ * @return 0 if success, otherwise errorcode
+ */
+int conf_get_float(const struct conf *conf, const char *name, double *num)
+{
+	struct pl opt;
+	int err;
+
+	if (!conf || !name || !num)
+		return EINVAL;
+
+	err = conf_get(conf, name, &opt);
+	if (err)
+		return err;
+
+	*num = pl_float(&opt);
+
+	return 0;
+}
+
+
 /**
  * Get the boolean value of a configuration item
  *

test/conf.c

@@ -17,12 +17,14 @@ int test_conf(void)
 	static const char *cfg =
 		"string_val\trattarei\n"
 		"u32_val       42\n"
-		"i32_val       -23\n";
+		"i32_val       -23\n"
+		"float_val     1.5\n";
 	char str[256];
 	struct conf *conf;
 	struct pl pl;
 	uint32_t u32;
 	int32_t i32;
+	double fl;
 	int err;
 
 	err = conf_alloc_buf(&conf, (uint8_t *)cfg, strlen(cfg));
@@ -42,6 +44,10 @@ int test_conf(void)
 	TEST_ERR(err);
 	TEST_EQUALS(-23, i32);
 
+	err = conf_get_float(conf, "float_val", &fl);
+	TEST_ERR(err);
+	TEST_EQUALS(1.5, fl);
+
 	/* Non-existing parameters */
 	if (0 == conf_get(conf, "rattarei", &pl))
 		goto badmsg;