util: use a shared lookup function for string tables

Macro DEFINE_STRING_TABLE_LOOKUP expands to a new function for each
of the almost 120 tables throghout the code.
Move the its implementation to a function (guaranteed to never be inlined),
and make the macro expand to an inlined function that calls this function.
This saves a few kilobytes from the systemd binary

(David: - fix coding-style
        - use 'ssize_t' to fix 32bit to 64bit propagation
        - use streq_ptr())

1 files changed, 13 insertions, 0 deletions

diff --git a/src/shared/util.c b/src/shared/util.c
index 3a63351247..ba035caed0 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -8089,3 +8089,16 @@ int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
         *p += k;
         return 1;
 }
+
+ssize_t string_table_lookup(const char * const *table, size_t len, const char *key) {
+        size_t i;
+
+        if (!key)
+                return -1;
+
+        for (i = 0; i < len; ++i)
+                if (streq_ptr(table[i], key))
+                        return (ssize_t)i;
+
+        return -1;
+}