From: Michael Tremer <michael.tremer@ipfire.org>
Date: Wed, 7 Jun 2023 13:16:58 +0000 (+0000)
Subject: string: Add macros to easily define string table lookups
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f9975100fdb9b9d66d9f21436e7973f9824bbcde;p=network.git

string: Add macros to easily define string table lookups

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/networkd/string.h b/src/networkd/string.h
index 5bdfc3d2..d94e2706 100644
--- a/src/networkd/string.h
+++ b/src/networkd/string.h
@@ -125,6 +125,51 @@ static inline void nw_string_empty(char* s) {
 		*s = '\0';
 }
 
+/*
+	Tables
+*/
+
+struct nw_string_table {
+	const int id;
+	const char* string;
+};
+
+static inline const char* nw_string_table_lookup_string(
+		const struct nw_string_table* table, const int id) {
+	const struct nw_string_table* entry = NULL;
+
+	for (entry = table; entry->string; entry++)
+		if (entry->id == id)
+			return entry->string;
+
+	return NULL;
+}
+
+static inline int nw_string_table_lookup_id(
+		const struct nw_string_table* table, const char* string) {
+	const struct nw_string_table* entry = NULL;
+
+	for (entry = table; entry->string; entry++)
+		if (strcmp(entry->string, string) == 0)
+			return entry->id;
+
+	return -1;
+}
+
+#define NW_STRING_TABLE_LOOKUP_ID(type, table, method) \
+	__attribute__((unused)) static type method(const char* s) { \
+		return nw_string_table_lookup_id(table, s); \
+	}
+
+#define NW_STRING_TABLE_LOOKUP_STRING(type, table, method) \
+	__attribute__((unused)) static const char* method(const type id) { \
+		return nw_string_table_lookup_string(table, id); \
+	}
+
+#define NW_STRING_TABLE_LOOKUP(type, table) \
+	NW_STRING_TABLE_LOOKUP_ID(type, table, table ## _from_string) \
+	NW_STRING_TABLE_LOOKUP_STRING(type, table, table ## _to_string)
+
 /*
 	Paths
 */