Move device_info handling into a new 'device.c' file

The legacy nickname wrappers (that use the device_info structure) are
left in gtk-gui.c.  We can slowly start moving away from them, we don't
want to start exporting that thing as some kind of generic interface.

This isn't a pure code movement - because we leave the legacy interfaces
alone, there are a few new interfaces in device.c (like "create a new
device_info entry") that were embedded into the legacy "create nickname"
code, and needed to be abstracted out.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 94 insertions, 0 deletions

diff --git a/device.c b/device.c
new file mode 100644
index 000000000..39f742acb
--- /dev/null
+++ b/device.c
@@ -0,0 +1,94 @@
+#include <string.h>
+#include "dive.h"
+#include "device.h"
+
+static struct device_info *device_info_list;
+
+static int match_device_info(struct device_info *entry, const char *model, uint32_t deviceid)
+{
+	return !strcmp(entry->model, model) && entry->deviceid == deviceid;
+}
+
+/* just find the entry for this divecomputer */
+struct device_info *get_device_info(const char *model, uint32_t deviceid)
+{
+	struct device_info *known = device_info_list;
+
+	/* a 0 deviceid doesn't get a nickname - those come from development
+	 * versions of Subsurface that didn't store the deviceid in the divecomputer entries */
+	if (!deviceid || !model)
+		return NULL;
+	while (known) {
+		if (match_device_info(known, model, deviceid))
+			return known;
+		known = known->next;
+	}
+	return NULL;
+}
+
+/* Get an existing device info model or create a new one if valid */
+struct device_info *create_device_info(const char *model, uint32_t deviceid)
+{
+	struct device_info *entry;
+
+	if (!deviceid || !model || !*model)
+		return NULL;
+	entry = get_device_info(model, deviceid);
+	if (entry)
+		return entry;
+	entry = calloc(1, sizeof(*entry));
+	if (entry) {
+		entry->model = strdup(model);
+		entry->deviceid = deviceid;
+		entry->next = device_info_list;
+		device_info_list = entry;
+	}
+	return entry;
+}
+
+void clear_device_saved_status(void)
+{
+	struct device_info *nn_entry = device_info_list;
+
+	while (nn_entry) {
+		nn_entry->saved = FALSE;
+		nn_entry = nn_entry->next;
+	}
+}
+
+/* do we have a DIFFERENT divecomputer of the same model? */
+struct device_info *get_different_device_info(const char *model, uint32_t deviceid)
+{
+	struct device_info *known = device_info_list;
+
+	/* a 0 deviceid matches any DC of the same model - those come from development
+	 * versions of Subsurface that didn't store the deviceid in the divecomputer entries */
+	if (!deviceid)
+		return NULL;
+	if (!model)
+		model = "";
+	while (known) {
+		if (known->model && !strcmp(known->model, model) &&
+		    known->deviceid != deviceid)
+			return known;
+		known = known->next;
+	}
+	return NULL;
+}
+
+struct device_info *remove_device_info(const char *model, uint32_t deviceid)
+{
+	struct device_info *entry, **p;
+
+	if (!deviceid || !model || !*model)
+		return NULL;
+	p = &device_info_list;
+	while ((entry = *p) != NULL) {
+		if (match_device_info(entry, model, deviceid)) {
+			*p = entry->next;
+			break;
+		}
+		p = &entry->next;
+	}
+	return entry;
+}