Add keybind lookup code

Also centralise NEXT_INSN macro, into its own header at least for now.

6 files changed, 140 insertions, 22 deletions

diff --git a/src/alias.c b/src/alias.c
index 9d53e69..3605800 100644
--- a/src/alias.c
+++ b/src/alias.c
@@ -25,6 +25,7 @@
 #include "gametype.h"
 #include "mem.h"
 #include "x86.h"
+#include "x86util.h"
 
 struct alias **_alias_head;
 
@@ -68,16 +69,6 @@ DEF_CCMD_HERE(sst_alias_clear, "Remove all command aliases", 0) {
 	alias_nuke();
 }
 
-// XXX: same as in demorec, might want some abstraction for this
-#define NEXT_INSN(p, tgt) do { \
-	int _len = x86_len(p); \
-	if (_len == -1) { \
-		errmsg_errorx("unknown or invalid instruction looking for %s", tgt); \
-		return false; \
-	} \
-	(p) += _len; \
-} while (0)
-
 static bool find_alias_head(con_cmdcb alias_cb) {
 #ifdef _WIN32
 	for (uchar *p = (uchar *)alias_cb; p - (uchar *)alias_cb < 64;) {
diff --git a/src/bind.c b/src/bind.c
new file mode 100644
index 0000000..62cdec3
--- /dev/null
+++ b/src/bind.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdbool.h>
+
+#include "con_.h"
+#include "dbg.h"
+#include "errmsg.h"
+#include "hook.h"
+#include "intdefs.h"
+#include "mem.h"
+#include "x86.h"
+#include "x86util.h"
+
+struct keyinfo {
+	char *binding;
+	uchar keyuptgt : 3;
+	uchar pressed : 1;
+};
+static struct keyinfo *keyinfo; // engine keybinds list (s_pKeyInfo[])
+
+const char *bind_get(int keycode) { return keyinfo[keycode].binding; }
+
+static bool find_keyinfo(con_cmdcb klbc_cb) {
+#ifdef _WIN32
+	for (uchar *p = (uchar *)klbc_cb; p - (uchar *)klbc_cb < 32;) {
+		// key_listboundkeys command, in its loop through each possible index,
+		// does a mov from that index into a register, something like:
+		// mov <reg>, dword ptr [<reg> * 8 + s_pKeyInfo]
+		if (p[0] == X86_MOVRMW && (p[1] & 0xC7) == 4 /* SIB + imm32 */ &&
+				(p[2] & 0xC7) == 0xC5 /* [immediate + reg * 8] */) {
+			keyinfo = mem_loadptr(p + 3);
+			return true;
+		}
+		NEXT_INSN(p, "load from key binding list");
+	}
+#else
+#warning TODO(linux): check whether linux is equivalent!
+#endif
+	return false;
+}
+
+bool bind_init(void) {
+	struct con_cmd *cmd_key_listboundkeys = con_findcmd("key_listboundkeys");
+	if (!cmd_key_listboundkeys) {
+		errmsg_errorx("couldn't find key_listboundkeys command");
+		return false;
+	}
+	con_cmdcb cb = con_getcmdcb(cmd_key_listboundkeys);
+	if (!find_keyinfo(cb)) {
+		errmsg_warnx("couldn't find key binding list");
+		return false;
+	}
+	return true;
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/bind.h b/src/bind.h
new file mode 100644
index 0000000..4d91a96
--- /dev/null
+++ b/src/bind.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef INC_BIND_H
+#define INC_BIND_H
+
+#include <stdbool.h>
+
+const char *bind_get(int keycode);
+
+bool bind_init(void);
+
+#endif
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/demorec.c b/src/demorec.c
index 17b1d08..b4a674d 100644
--- a/src/demorec.c
+++ b/src/demorec.c
@@ -32,6 +32,7 @@
 #include "ppmagic.h"
 #include "vcall.h"
 #include "x86.h"
+#include "x86util.h"
 
 DEF_CVAR(sst_autorecord, "Continuously record demos even after reconnecting", 1,
 		CON_ARCHIVE | CON_HIDDEN)
@@ -152,17 +153,6 @@ static void hook_stop_cb(const struct con_cmdargs *args) {
 	wantstop = false;
 }
 
-// XXX: probably want some general foreach-instruction macro once we start doing
-// this kind of hackery in multiple different places
-#define NEXT_INSN(p, tgt) do { \
-	int _len = x86_len(p); \
-	if (_len == -1) { \
-		errmsg_errorx("unknown or invalid instruction looking for %s", tgt); \
-		return false; \
-	} \
-	(p) += _len; \
-} while (0)
-
 // This finds the "demorecorder" global variable (the engine-wide CDemoRecorder
 // instance).
 static inline bool find_demorecorder(void) {
diff --git a/src/sst.c b/src/sst.c
index 1321d03..93908dc 100644
--- a/src/sst.c
+++ b/src/sst.c
@@ -22,6 +22,7 @@
 #endif
 
 #include "ac.h"
+#include "bind.h"
 #include "alias.h"
 #include "autojump.h"
 #include "con_.h"
@@ -190,7 +191,7 @@ static const void *const *const plugin_obj;
 // figures out the dependencies at build time and generates all the init glue
 // but we want to actually release the plugin this decade so for now I'm just
 // plonking some bools here and worrying about it later. :^)
-static bool has_ac = false,  has_autojump = false, has_demorec = false,
+static bool has_ac = false, has_autojump = false, has_demorec = false,
 		has_fov = false, has_nosleep = false, has_portalcolours = false;
 #ifdef _WIN32
 static bool has_rinput = false;
@@ -206,6 +207,7 @@ static const char *updatenotes = "\
 ";
 
 static void do_featureinit(void) {
+	bool has_bind = bind_init();
 	has_ac = ac_init();
 	bool has_alias = alias_init();
 	has_autojump = autojump_init();
diff --git a/src/x86util.h b/src/x86util.h
new file mode 100644
index 0000000..0ae89ae
--- /dev/null
+++ b/src/x86util.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef INC_X86UTIL_H
+#define INC_X86UTIL_H
+
+#include <stdbool.h>
+
+#include "errmsg.h"
+#include "x86.h"
+
+// XXX: don't know where else to put this, or how else to design this, so this
+// is very much a plonk-it-here-for-now scenario.
+
+#define NEXT_INSN(p, tgt) do { \
+	int _len = x86_len(p); \
+	if (_len == -1) { \
+		errmsg_errorx("unknown or invalid instruction looking for %s", tgt); \
+		return false; \
+	} \
+	(p) += _len; \
+} while (0)
+
+#endif