basic: add string table macros for "extended boolean" enums

In a couple of cases we maintain configuration settings that know an on
and off state, like a boolean, plus some additional states. We generally
parse them as booleans first, and if that fails check for specific
additional values.

This adds a generalized set of macros for parsing such settings, and
ports one use in resolved and another in networkd over to it.

3 files changed, 21 insertions, 44 deletions

diff --git a/src/basic/string-table.h b/src/basic/string-table.h
index 2181a3a767..588404ab5a 100644
--- a/src/basic/string-table.h
+++ b/src/basic/string-table.h
@@ -47,16 +47,34 @@ ssize_t string_table_lookup(const char * const *table, size_t len, const char *k
                 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
         }
 
+#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
+        scope type name##_from_string(const char *s) {                  \
+                int b;                                                  \
+                b = parse_boolean(s);                                   \
+                if (b == 0)                                             \
+                        return (type) 0;                                \
+                else if (b > 0)                                         \
+                        return yes;                                     \
+                return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
+        }
+
 #define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                    \
         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
         struct __useless_struct_to_allow_trailing_semicolon__
 
+#define _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,scope)   \
+        _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
+        _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
+        struct __useless_struct_to_allow_trailing_semicolon__
+
 #define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
 
+#define DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes) _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,)
+
 /* For string conversions where numbers are also acceptable */
 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
         int name##_to_string_alloc(type i, char **str) {                \
diff --git a/src/network/networkd-util.c b/src/network/networkd-util.c
index 2545621a93..1cc4f07e1e 100644
--- a/src/network/networkd-util.c
+++ b/src/network/networkd-util.c
@@ -108,47 +108,6 @@ static const char* const resolve_support_table[_RESOLVE_SUPPORT_MAX] = {
         [RESOLVE_SUPPORT_RESOLVE] = "resolve",
 };
 
-DEFINE_STRING_TABLE_LOOKUP(resolve_support, ResolveSupport);
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(resolve_support, ResolveSupport, RESOLVE_SUPPORT_YES);
 
-int config_parse_resolve(
-                const char* unit,
-                const char *filename,
-                unsigned line,
-                const char *section,
-                unsigned section_line,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
-
-        ResolveSupport *resolve = data;
-        int k;
-
-        assert(filename);
-        assert(lvalue);
-        assert(rvalue);
-        assert(resolve);
-
-        /* Our enum shall be a superset of booleans, hence first try
-         * to parse as boolean, and then as enum */
-
-        k = parse_boolean(rvalue);
-        if (k > 0)
-                *resolve = RESOLVE_SUPPORT_YES;
-        else if (k == 0)
-                *resolve = RESOLVE_SUPPORT_NO;
-        else {
-                ResolveSupport s;
-
-                s = resolve_support_from_string(rvalue);
-                if (s < 0){
-                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse %s= option, ignoring: %s", lvalue, rvalue);
-                        return 0;
-                }
-
-                *resolve = s;
-        }
-
-        return 0;
-}
+DEFINE_CONFIG_PARSE_ENUM(config_parse_resolve, resolve_support, ResolveSupport, "Failed to parse resolve support");
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 20955b3f6b..2241df70c2 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -1169,4 +1169,4 @@ static const char* const support_table[_SUPPORT_MAX] = {
         [SUPPORT_YES] = "yes",
         [SUPPORT_RESOLVE] = "resolve",
 };
-DEFINE_STRING_TABLE_LOOKUP(support, Support);
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(support, Support, SUPPORT_YES);