basic/psi-util: add lookup table for PressureType

src/basic/psi-util.c

@@ -19,7 +19,7 @@ int read_resource_pressure(const char *path, PressureType type, ResourcePressure
         _cleanup_fclose_ FILE *f = NULL;
         unsigned field_filled = 0;
         ResourcePressure rp = {};
-        const char *t, *cline;
+        const char *cline;
         char *word;
         int r;
 
@@ -27,12 +27,7 @@ int read_resource_pressure(const char *path, PressureType type, ResourcePressure
         assert(IN_SET(type, PRESSURE_TYPE_SOME, PRESSURE_TYPE_FULL));
         assert(ret);
 
-        if (type == PRESSURE_TYPE_SOME)
-                t = "some";
-        else if (type == PRESSURE_TYPE_FULL)
-                t = "full";
-        else
-                return -EINVAL;
+        const char *t = ASSERT_PTR(pressure_type_to_string(type));
 
         r = fopen_unlocked(path, "re", &f);
         if (r < 0)
@@ -131,6 +126,13 @@ static const char* const pressure_resource_table[_PRESSURE_RESOURCE_MAX] = {
 
 DEFINE_STRING_TABLE_LOOKUP(pressure_resource, PressureResource);
 
+static const char* const pressure_type_table[_PRESSURE_TYPE_MAX] = {
+        [PRESSURE_TYPE_SOME] = "some",
+        [PRESSURE_TYPE_FULL] = "full",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(pressure_type, PressureType);
+
 int is_pressure_supported(void) {
         static thread_local int cached = -1;
         int r;

src/basic/psi-util.h

@@ -7,6 +7,8 @@
 typedef enum PressureType {
         PRESSURE_TYPE_SOME,
         PRESSURE_TYPE_FULL,
+        _PRESSURE_TYPE_MAX,
+        _PRESSURE_TYPE_INVALID = -EINVAL,
 } PressureType;
 
 typedef enum PressureResource {
@@ -50,6 +52,7 @@ static inline const PressureResourceInfo* pressure_resource_get_info(PressureRes
 }
 
 DECLARE_STRING_TABLE_LOOKUP(pressure_resource, PressureResource);
+DECLARE_STRING_TABLE_LOOKUP(pressure_type, PressureType);
 
 /* Default parameters for pressure watch logic in sd-event and PID 1 */
 #define PRESSURE_DEFAULT_TYPE "some"