From 486d5cc6d497315af659e13c4b0991de4ab4af82 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 24 Oct 2011 21:34:54 -0400
Subject: [PATCH] Added SDL_GetScancodeFromName() and SDL_GetKeyFromName()

---
 include/SDL_keyboard.h    | 26 +++++++++---
 src/events/SDL_keyboard.c | 83 +++++++++++++++++++++++++++++++++++++++
 src/stdlib/SDL_string.c   |  2 +-
 3 files changed, 105 insertions(+), 6 deletions(-)

diff --git a/include/SDL_keyboard.h b/include/SDL_keyboard.h
index c390cb69c..1f9a66df2 100644
--- a/include/SDL_keyboard.h
+++ b/include/SDL_keyboard.h
@@ -111,15 +111,22 @@ extern DECLSPEC SDL_Scancode SDLCALL SDL_GetScancodeFromKey(SDL_Keycode key);
 /**
  *  \brief Get a human-readable name for a scancode.
  *  
- *  \return A pointer to a UTF-8 string that stays valid at least until the next
- *          call to this function. If you need it around any longer, you must 
- *          copy it.  If the scancode doesn't have a name, this function returns
+ *  \return A pointer to the name for the scancode.
+ *          If the scancode doesn't have a name, this function returns
  *          an empty string ("").
  *
  *  \sa SDL_Scancode
  */
-extern DECLSPEC const char *SDLCALL SDL_GetScancodeName(SDL_Scancode
-                                                        scancode);
+extern DECLSPEC const char *SDLCALL SDL_GetScancodeName(SDL_Scancode scancode);
+
+/**
+ *  \brief Get a scancode from a human-readable name
+ *  
+ *  \return scancode, or SDL_SCANCODE_UNKNOWN if the name wasn't recognized
+ *
+ *  \sa SDL_Scancode
+ */
+extern DECLSPEC SDL_Scancode SDLCALL SDL_GetScancodeFromName(const char *name);
 
 /**
  *  \brief Get a human-readable name for a key.
@@ -133,6 +140,15 @@ extern DECLSPEC const char *SDLCALL SDL_GetScancodeName(SDL_Scancode
  */
 extern DECLSPEC const char *SDLCALL SDL_GetKeyName(SDL_Keycode key);
 
+/**
+ *  \brief Get a key code from a human-readable name
+ *  
+ *  \return key code, or SDLK_UNKNOWN if the name wasn't recognized
+ *
+ *  \sa SDL_Keycode
+ */
+extern DECLSPEC SDL_Keycode SDLCALL SDL_GetKeyFromName(const char *name);
+
 /**
  *  \brief Start accepting Unicode text input events.
  *  
diff --git a/src/events/SDL_keyboard.c b/src/events/SDL_keyboard.c
index 94dd060ae..7d990dd94 100644
--- a/src/events/SDL_keyboard.c
+++ b/src/events/SDL_keyboard.c
@@ -854,6 +854,23 @@ SDL_GetKeyFromScancode(SDL_Scancode scancode)
     return keyboard->keymap[scancode];
 }
 
+SDL_Keycode SDL_GetKeycodeFromName(const char *name)
+{
+	int i;
+
+	if (!name || !*name) {
+		return SDL_SCANCODE_UNKNOWN;
+	}
+
+	for (i = 0; i < SDL_arraysize(SDL_scancode_names); ++i) {
+		if (SDL_strcasecmp(name, SDL_scancode_names[i]) == 0) {
+			return (SDL_Scancode)i;
+		}
+	}
+	return SDL_SCANCODE_UNKNOWN;
+}
+
+
 SDL_Scancode
 SDL_GetScancodeFromKey(SDL_Keycode key)
 {
@@ -880,6 +897,25 @@ SDL_GetScancodeName(SDL_Scancode scancode)
         return "";
 }
 
+SDL_Scancode SDL_GetScancodeFromName(const char *name)
+{
+	int i;
+
+	if (!name || !*name) {
+		return SDL_SCANCODE_UNKNOWN;
+	}
+
+	for (i = 0; i < SDL_arraysize(SDL_scancode_names); ++i) {
+		if (!SDL_scancode_names[i]) {
+			continue;
+		}
+		if (SDL_strcasecmp(name, SDL_scancode_names[i]) == 0) {
+			return (SDL_Scancode)i;
+		}
+	}
+	return SDL_SCANCODE_UNKNOWN;
+}
+
 const char *
 SDL_GetKeyName(SDL_Keycode key)
 {
@@ -919,4 +955,51 @@ SDL_GetKeyName(SDL_Keycode key)
     }
 }
 
+SDL_Keycode
+SDL_GetKeyFromName(const char *name)
+{
+	SDL_Keycode key;
+
+	/* If it's a single UTF-8 character, then that's the keycode itself */
+	key = *(const unsigned char *)name;
+	if (key >= 0xF0) {
+		if (SDL_strlen(name) == 4) {
+			int i = 0;
+			key  = (Uint16)(name[i]&0x07) << 18;
+			key |= (Uint16)(name[++i]&0x3F) << 12;
+			key |= (Uint16)(name[++i]&0x3F) << 6;
+			key |= (Uint16)(name[++i]&0x3F);
+			return key;
+		}
+		return SDLK_UNKNOWN;
+	} else if (key >= 0xE0) {
+		if (SDL_strlen(name) == 3) {
+			int i = 0;
+			key  = (Uint16)(name[i]&0x0F) << 12;
+			key |= (Uint16)(name[++i]&0x3F) << 6;
+			key |= (Uint16)(name[++i]&0x3F);
+			return key;
+		}
+		return SDLK_UNKNOWN;
+	} else if (key >= 0xC0) {
+		if (SDL_strlen(name) == 2) {
+			int i = 0;
+			key  = (Uint16)(name[i]&0x1F) << 6;
+			key |= (Uint16)(name[++i]&0x3F);
+			return key;
+		}
+		return SDLK_UNKNOWN;
+	} else {
+		if (SDL_strlen(name) == 1) {
+			if (key >= 'A' && key <= 'Z') {
+				key += 32;
+			}
+			return key;
+		}
+
+		/* Get the scancode for this name, and the associated keycode */
+		return SDL_default_keymap[SDL_GetScancodeFromName(name)];
+	}
+}
+
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c
index dc7d5a81a..e3942713a 100644
--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -33,7 +33,7 @@
 
 int UTF8_TrailingBytes(unsigned char c)
 {
-    if (c >= 0xC0 && c<= 0xDF)
+    if (c >= 0xC0 && c <= 0xDF)
         return 1;
     else if (c >= 0xE0 && c <= 0xEF)
         return 2;