id128-util: add id128_from_string_not_null()

src/libsystemd/sd-id128/id128-util.c

@@ -13,6 +13,23 @@
 #include "string-util.h"
 #include "sync-util.h"
 
+int id128_from_string_nonzero(const char *s, sd_id128_t *ret) {
+        sd_id128_t t;
+        int r;
+
+        assert(ret);
+
+        r = sd_id128_from_string(ASSERT_PTR(s), &t);
+        if (r < 0)
+                return r;
+
+        if (sd_id128_is_null(t))
+                return -ENXIO;
+
+        *ret = t;
+        return 0;
+}
+
 bool id128_is_valid(const char *s) {
         size_t l;
 

src/libsystemd/sd-id128/id128-util.h

@@ -21,6 +21,8 @@ typedef enum Id128Flag {
         ID128_REFUSE_NULL   = 1 << 3, /* Refuse all zero ID with -ENOMEDIUM. */
 } Id128Flag;
 
+int id128_from_string_nonzero(const char *s, sd_id128_t *ret);
+
 int id128_read_fd(int fd, Id128Flag f, sd_id128_t *ret);
 int id128_read_at(int dir_fd, const char *path, Id128Flag f, sd_id128_t *ret);
 static inline int id128_read(const char *path, Id128Flag f, sd_id128_t *ret) {

src/test/test-id128.c

@@ -20,6 +20,7 @@
 #define ID128_WALDI SD_ID128_MAKE(01, 02, 03, 04, 05, 06, 07, 08, 09, 0a, 0b, 0c, 0d, 0e, 0f, 10)
 #define STR_WALDI "0102030405060708090a0b0c0d0e0f10"
 #define UUID_WALDI "01020304-0506-0708-090a-0b0c0d0e0f10"
+#define STR_NULL "00000000000000000000000000000000"
 
 TEST(id128) {
         sd_id128_t id, id2;
@@ -75,6 +76,13 @@ TEST(id128) {
         assert_se(sd_id128_from_string("01020304-0506-0708-090a0b0c0d0e0f10", &id) < 0);
         assert_se(sd_id128_from_string("010203040506-0708-090a-0b0c0d0e0f10", &id) < 0);
 
+        assert_se(id128_from_string_nonzero(STR_WALDI, &id) == 0);
+        assert_se(id128_from_string_nonzero(STR_NULL, &id) == -ENXIO);
+        assert_se(id128_from_string_nonzero("01020304-0506-0708-090a-0b0c0d0e0f101", &id) < 0);
+        assert_se(id128_from_string_nonzero("01020304-0506-0708-090a-0b0c0d0e0f10-", &id) < 0);
+        assert_se(id128_from_string_nonzero("01020304-0506-0708-090a0b0c0d0e0f10", &id) < 0);
+        assert_se(id128_from_string_nonzero("010203040506-0708-090a-0b0c0d0e0f10", &id) < 0);
+
         assert_se(id128_is_valid(STR_WALDI));
         assert_se(id128_is_valid(UUID_WALDI));
         assert_se(!id128_is_valid(""));