qmk_settings: initial prototype

1 files changed, 36 insertions, 0 deletions

diff --git a/quantum/qmk_settings.c b/quantum/qmk_settings.c
new file mode 100644
index 0000000000..d63a54a8c5
--- /dev/null
+++ b/quantum/qmk_settings.c
@@ -0,0 +1,36 @@
+#include "qmk_settings.h"
+
+#include <stddef.h>
+#include "progmem.h"
+#include <string.h>
+
+qmk_settings_t QS;
+
+#define DECLARE_SETTING(id, field)  { .qsid=id, .ptr=&QS.field, .sz=sizeof(QS.field) }
+
+static const qmk_settings_proto_t protos[] PROGMEM = {
+   DECLARE_SETTING(1, grave_esc_override),
+};
+
+static const qmk_settings_proto_t *find_setting(uint16_t qsid) {
+    for (size_t i = 0; i < sizeof(protos)/sizeof(*protos); ++i)
+        if (pgm_read_word(&protos[i].qsid) == qsid)
+            return &protos[i];
+    return NULL;
+}
+
+int qmk_settings_get(uint16_t qsid, void *setting, size_t maxsz) {
+    const qmk_settings_proto_t *proto = find_setting(qsid);
+    if (!proto || pgm_read_word(&proto->sz) > maxsz)
+        return -1;
+    memcpy(setting, pgm_read_ptr(&proto->ptr), pgm_read_word(&proto->sz));
+    return 0;
+}
+
+int qmk_settings_set(uint16_t qsid, const void *setting, size_t maxsz) {
+    const qmk_settings_proto_t *proto = find_setting(qsid);
+    if (!proto || pgm_read_word(&proto->sz) > maxsz)
+        return -1;
+    memcpy(pgm_read_ptr(&proto->ptr), setting, pgm_read_word(&proto->sz));
+    return 0;
+}