Make evemu ABI resilient

Hide the evemu struct, make it versioned, and instead use new/delete
and accessor functions. This should give us enough ABI stability to
run mixed library implementations.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

2 files changed, 49 insertions, 1 deletions

diff --git a/src/evemu-impl.h b/src/evemu-impl.h
new file mode 100644
index 0000000..2346590
--- /dev/null
+++ b/src/evemu-impl.h
@@ -0,0 +1,19 @@
+#ifndef _EVEMU_IMPL_H
+#define _EVEMU_IMPL_H
+
+#include <evemu.h>
+#include <linux/uinput.h>
+
+#define EVPLAY_NBITS    KEY_CNT
+#define EVPLAY_NBYTES   ((EVPLAY_NBITS + 7) / 8)
+
+struct evemu_device {
+        int version_major, version_minor;
+        char name[UINPUT_MAX_NAME_SIZE];
+        struct input_id id;
+        unsigned char mask[EV_CNT][EVPLAY_NBYTES];
+        int bytes[EV_CNT];
+        struct input_absinfo abs[ABS_CNT];
+};
+
+#endif
diff --git a/src/evemu.c b/src/evemu.c
index 54156aa..53bda86 100644
--- a/src/evemu.c
+++ b/src/evemu.c
@@ -26,7 +26,8 @@
  *
  ****************************************************************************/
 
-#include "evemu.h"
+#include "evemu-impl.h"
+#include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <fcntl.h>
@@ -44,6 +45,34 @@ static void copy_bits(unsigned char *mask, const unsigned long *bits, int bytes)
         }
 }
 
+struct evemu_device *evemu_new(const char *name)
+{
+        struct evemu_device *dev = calloc(1, sizeof(struct evemu_device));
+
+        dev->version_major = EVEMU_VERSION_MAJOR;
+        dev->version_minor = EVEMU_VERSION_MINOR;
+
+        if (name && strlen(name) < sizeof(dev->name))
+                strcpy(dev->name, name);
+
+        return dev;
+}
+
+void evemu_delete(struct evemu_device *dev)
+{
+        free(dev);
+}
+
+const char *evemu_get_name(const struct evemu_device *dev)
+{
+        return dev->name;
+}
+
+int evemu_has(const struct evemu_device *dev, int type, int code)
+{
+        return (dev->mask[type][code >> 3] >> (code & 7)) & 1;
+}
+
 int evemu_extract(struct evemu_device *dev, int fd)
 {
         unsigned long bits[64];