parse-util: add parse_loadavg_fixed_point

src/basic/parse-util.c

@@ -862,3 +862,45 @@ int parse_oom_score_adjust(const char *s, int *ret) {
         *ret = v;
         return 0;
 }
+
+int store_loadavg_fixed_point(unsigned long i, unsigned long f, loadavg_t *ret) {
+        assert(ret);
+
+        if (i >= (~0UL << FSHIFT))
+                return -ERANGE;
+
+        i = i << FSHIFT;
+        f = DIV_ROUND_UP((f << FSHIFT), 100);
+
+        if (f >= FIXED_1)
+                return -ERANGE;
+
+        *ret = i | f;
+        return 0;
+}
+
+int parse_loadavg_fixed_point(const char *s, loadavg_t *ret) {
+        const char *d, *f_str, *i_str;
+        unsigned long i, f;
+        int r;
+
+        assert(s);
+        assert(ret);
+
+        d = strchr(s, '.');
+        if (!d)
+                return -EINVAL;
+
+        i_str = strndupa(s, d - s);
+        f_str = d + 1;
+
+        r = safe_atolu_full(i_str, 10, &i);
+        if (r < 0)
+                return r;
+
+        r = safe_atolu_full(f_str, 10, &f);
+        if (r < 0)
+                return r;
+
+        return store_loadavg_fixed_point(i, f, ret);
+}