json-util: add generic json_dispatch_filename() dispatch helper

diff --git a/src/libsystemd/sd-json/json-util.c b/src/libsystemd/sd-json/json-util.c
index f2d306f78107ef9e356ae66294f58d807421bd6c..aa2d7f5e64819717a63562a9ebabe0fcb53a7212 100644 (file)
--- a/src/libsystemd/sd-json/json-util.c
+++ b/src/libsystemd/sd-json/json-util.c
@@ -166,6 +166,28 @@ int json_dispatch_path(const char *name, sd_json_variant *variant, sd_json_dispa
         return 0;
 }
 
+int json_dispatch_filename(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata) {
+        char **s = ASSERT_PTR(userdata);
+        const char *n;
+
+        if (sd_json_variant_is_null(variant)) {
+                *s = mfree(*s);
+                return 0;
+        }
+
+        if (!sd_json_variant_is_string(variant))
+                return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a string.", strna(name));
+
+        n = sd_json_variant_string(variant);
+        if (!filename_is_valid(n))
+                return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a valid file name.", strna(name));
+
+        if (free_and_strdup(s, n) < 0)
+                return json_log_oom(variant, flags);
+
+        return 0;
+}
+
 int json_variant_new_pidref(sd_json_variant **ret, PidRef *pidref) {
         sd_id128_t boot_id = SD_ID128_NULL;
         int r;

diff --git a/src/libsystemd/sd-json/json-util.h b/src/libsystemd/sd-json/json-util.h
index 9150ad1063301a584228821c0abeccf3016c3883..7526d2bdf20c1fd76203bbd4b63a06df4c90d3bd 100644 (file)
--- a/src/libsystemd/sd-json/json-util.h
+++ b/src/libsystemd/sd-json/json-util.h
@@ -114,6 +114,7 @@ int json_dispatch_const_user_group_name(const char *name, sd_json_variant *varia
 int json_dispatch_in_addr(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_const_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
+int json_dispatch_filename(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_pidref(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_devnum(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_ifindex(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);