Add 'config get' command to retrieve configuration

The command allows the client to retrieve individual parameters from the
configuration. This follows a similar syntax to the 'config set'
command, with the client supplying the section and key, and if there is
a matching entry in the configuration, it will return the corresponding
value.

daemon/x52d_command.c

@@ -278,6 +278,20 @@ static void cmd_config(char *buffer, int *buflen, int argc, char **argv)
         return;
     }
 
+    MATCH(1, "get") {
+        if (argc == 4) {
+            const char *rv = x52d_config_get(argv[2], argv[3]);
+            if (rv == NULL) {
+                ERR_fmt("Error getting '%s.%s'", argv[2], argv[3]);
+            } else {
+                response_strings(buffer, buflen, "DATA", 3, argv[2], argv[3], rv);
+            }
+        } else {
+            ERR_fmt("Unexpected arguments for 'config get' command; got %d, expected 4", argc);
+        }
+        return;
+    }
+
     ERR_fmt("Unknown subcommand '%s' for 'config' command", argv[1]);
 }
 

daemon/x52d_config.c

@@ -68,6 +68,19 @@ int x52d_config_set(const char *section, const char *key, const char *value)
     return x52d_config_process_kv(&x52d_config, section, key, value);
 }
 
+const char *x52d_config_get(const char *section, const char *key)
+{
+    const char *value;
+    if (section == NULL || key == NULL) {
+        return NULL;
+    }
+
+    value = x52d_config_get_param(&x52d_config, section, key);
+    PINELOG_TRACE("Processed config get '%s.%s'='%s'", section, key, value);
+
+    return value;
+}
+
 /* Callback stubs
  * TODO: Remove the ones below when their implementation is complete
  */

daemon/x52d_config.h

@@ -76,6 +76,7 @@ void x52d_cfg_set_Profiles_ClutchEnabled(bool param);
 void x52d_cfg_set_Profiles_ClutchLatched(bool param);
 
 int x52d_config_process_kv(void *user, const char *section, const char *key, const char *value);
+const char *x52d_config_get_param(struct x52d_config *cfg, const char *section, const char *key);
 
 int x52d_config_set_defaults(struct x52d_config *cfg);
 
@@ -94,5 +95,6 @@ int x52d_config_save_file(struct x52d_config *cfg, const char *cfg_file);
 void x52d_config_save(const char *cfg_file);
 
 int x52d_config_set(const char *section, const char *key, const char *value);
+const char *x52d_config_get(const char *section, const char *key);
 
 #endif // !defined X52D_CONFIG_H

daemon/x52d_config_dump.c

@@ -142,3 +142,18 @@ exit_dump:
     return (value == NULL);
 }
 
+const char *x52d_config_get_param(struct x52d_config *cfg, const char *section, const char *key)
+{
+    const char *value = NULL;
+
+    #define CFG(section_c, key_c, name, type, def) do { \
+        if (strcasecmp(section, #section_c) == 0 && strcasecmp(key, #key_c) == 0) { \
+            value = type ## _dumper(section, key, cfg, offsetof(struct x52d_config, name)); \
+            goto return_value; \
+        } \
+    } while (0);
+    #include "x52d_config.def"
+
+return_value:
+    return value;
+}

po/libx52.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: libx52 0.2.3\n"
 "Report-Msgid-Bugs-To: https://github.com/nirenjan/libx52/issues\n"
-"POT-Creation-Date: 2021-11-05 15:27-0700\n"
+"POT-Creation-Date: 2021-11-07 06:24-0800\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -659,31 +659,31 @@ msgstr ""
 msgid "Shutting down X52 clock manager thread"
 msgstr ""
 
-#: daemon/x52d_command.c:53
+#: daemon/x52d_command.c:52
 #, c-format
 msgid "Error accepting client connection on command socket: %s"
 msgstr ""
 
-#: daemon/x52d_command.c:90
+#: daemon/x52d_command.c:89
 #, c-format
 msgid "Error when polling command socket: FD %d, error %d, len %lu"
 msgstr ""
 
-#: daemon/x52d_command.c:117
+#: daemon/x52d_command.c:116
 #, c-format
 msgid "Error when polling for command: %s"
 msgstr ""
 
-#: daemon/x52d_command.c:121
+#: daemon/x52d_command.c:120
 msgid "Timed out when polling for command"
 msgstr ""
 
-#: daemon/x52d_command.c:345
+#: daemon/x52d_command.c:354
 #, c-format
 msgid "Error reading from client %d: %s"
 msgstr ""
 
-#: daemon/x52d_command.c:356
+#: daemon/x52d_command.c:365
 #, c-format
 msgid "Short write to client %d; expected %d bytes, wrote %d bytes"
 msgstr ""

po/xx_PL.po

@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: libx52 0.2.3\n"
 "Report-Msgid-Bugs-To: https://github.com/nirenjan/libx52/issues\n"
-"POT-Creation-Date: 2021-11-05 15:27-0700\n"
+"POT-Creation-Date: 2021-11-07 06:24-0800\n"
 "PO-Revision-Date: 2021-11-04 15:35-0700\n"
 "Last-Translator: Nirenjan Krishnan <nirenjan@gmail.com>\n"
 "Language-Team: Dummy Language for testing i18n\n"
@@ -709,32 +709,32 @@ msgstr "Erroray %d initializingay ockclay eadthray: %s"
 msgid "Shutting down X52 clock manager thread"
 msgstr "Uttingshay ownday X52 ockclay anagermay eadthray"
 
-#: daemon/x52d_command.c:53
+#: daemon/x52d_command.c:52
 #, c-format
 msgid "Error accepting client connection on command socket: %s"
 msgstr "Erroray acceptingay ientclay onnectioncay onay ommandcay ocketsay: %s"
 
-#: daemon/x52d_command.c:90
+#: daemon/x52d_command.c:89
 #, c-format
 msgid "Error when polling command socket: FD %d, error %d, len %lu"
 msgstr ""
 "Erroray enwhay ollingpay ommandcay ocketsay: FDay %d, erroray %d, enlay %lu"
 
-#: daemon/x52d_command.c:117
+#: daemon/x52d_command.c:116
 #, c-format
 msgid "Error when polling for command: %s"
 msgstr "Erroray enwhay ollingpay orfay ommandcay: %s"
 
-#: daemon/x52d_command.c:121
+#: daemon/x52d_command.c:120
 msgid "Timed out when polling for command"
 msgstr "Imedtay outay enwhay ollingpay orfay ommandcay"
 
-#: daemon/x52d_command.c:345
+#: daemon/x52d_command.c:354
 #, c-format
 msgid "Error reading from client %d: %s"
 msgstr "Erroray eadingray omfray ientclay %d: %s"
 
-#: daemon/x52d_command.c:356
+#: daemon/x52d_command.c:365
 #, c-format
 msgid "Short write to client %d; expected %d bytes, wrote %d bytes"
 msgstr ""