parse-util: add permyriad parsing

src/basic/parse-util.c

@@ -627,11 +627,11 @@ int parse_fractional_part_u(const char **p, size_t digits, unsigned *res) {
         return 0;
 }
 
-int parse_percent_unbounded(const char *p) {
+static int parse_parts_value_whole(const char *p, const char *symbol) {
         const char *pc, *n;
         int r, v;
 
-        pc = endswith(p, "%");
+        pc = endswith(p, symbol);
         if (!pc)
                 return -EINVAL;
 
@@ -645,6 +645,74 @@ int parse_percent_unbounded(const char *p) {
         return v;
 }
 
+static int parse_parts_value_with_tenths_place(const char *p, const char *symbol) {
+        const char *pc, *dot, *n;
+        int r, q, v;
+
+        pc = endswith(p, symbol);
+        if (!pc)
+                return -EINVAL;
+
+        dot = memchr(p, '.', pc - p);
+        if (dot) {
+                if (dot + 2 != pc)
+                        return -EINVAL;
+                if (dot[1] < '0' || dot[1] > '9')
+                        return -EINVAL;
+                q = dot[1] - '0';
+                n = strndupa(p, dot - p);
+        } else {
+                q = 0;
+                n = strndupa(p, pc - p);
+        }
+        r = safe_atoi(n, &v);
+        if (r < 0)
+                return r;
+        if (v < 0)
+                return -ERANGE;
+        if (v > (INT_MAX - q) / 10)
+                return -ERANGE;
+
+        v = v * 10 + q;
+        return v;
+}
+
+static int parse_parts_value_with_hundredths_place(const char *p, const char *symbol) {
+        const char *pc, *dot, *n;
+        int r, q, v;
+
+        pc = endswith(p, symbol);
+        if (!pc)
+                return -EINVAL;
+
+        dot = memchr(p, '.', pc - p);
+        if (dot) {
+                if (dot + 3 != pc)
+                        return -EINVAL;
+                if (dot[1] < '0' || dot[1] > '9' || dot[2] < '0' || dot[2] > '9')
+                        return -EINVAL;
+                q = (dot[1] - '0') * 10 + (dot[2] - '0');
+                n = strndupa(p, dot - p);
+        } else {
+                q = 0;
+                n = strndupa(p, pc - p);
+        }
+        r = safe_atoi(n, &v);
+        if (r < 0)
+                return r;
+        if (v < 0)
+                return -ERANGE;
+        if (v > (INT_MAX - q) / 100)
+                return -ERANGE;
+
+        v = v * 100 + q;
+        return v;
+}
+
+int parse_percent_unbounded(const char *p) {
+        return parse_parts_value_whole(p, "%");
+}
+
 int parse_percent(const char *p) {
         int v;
 
@@ -656,46 +724,13 @@ int parse_percent(const char *p) {
 }
 
 int parse_permille_unbounded(const char *p) {
-        const char *pc, *pm, *dot, *n;
-        int r, q, v;
+        const char *pm;
 
         pm = endswith(p, "‰");
-        if (pm) {
-                n = strndupa(p, pm - p);
-                r = safe_atoi(n, &v);
-                if (r < 0)
-                        return r;
-                if (v < 0)
-                        return -ERANGE;
-        } else {
-                pc = endswith(p, "%");
-                if (!pc)
-                        return -EINVAL;
+        if (pm)
+                return parse_parts_value_whole(p, "‰");
 
-                dot = memchr(p, '.', pc - p);
-                if (dot) {
-                        if (dot + 2 != pc)
-                                return -EINVAL;
-                        if (dot[1] < '0' || dot[1] > '9')
-                                return -EINVAL;
-                        q = dot[1] - '0';
-                        n = strndupa(p, dot - p);
-                } else {
-                        q = 0;
-                        n = strndupa(p, pc - p);
-                }
-                r = safe_atoi(n, &v);
-                if (r < 0)
-                        return r;
-                if (v < 0)
-                        return -ERANGE;
-                if (v > (INT_MAX - q) / 10)
-                        return -ERANGE;
-
-                v = v * 10 + q;
-        }
-
-        return v;
+        return parse_parts_value_with_tenths_place(p, "%");
 }
 
 int parse_permille(const char *p) {
@@ -708,6 +743,30 @@ int parse_permille(const char *p) {
         return v;
 }
 
+int parse_permyriad_unbounded(const char *p) {
+        const char *pm;
+
+        pm = endswith(p, "‱");
+        if (pm)
+                return parse_parts_value_whole(p, "‱");
+
+        pm = endswith(p, "‰");
+        if (pm)
+                return parse_parts_value_with_tenths_place(p, "‰");
+
+        return parse_parts_value_with_hundredths_place(p, "%");
+}
+
+int parse_permyriad(const char *p) {
+        int v;
+
+        v = parse_permyriad_unbounded(p);
+        if (v > 10000)
+                return -ERANGE;
+
+        return v;
+}
+
 int parse_nice(const char *p, int *ret) {
         int n, r;