Code generator for the previous commit

This is not used automatically as I don't know how to tell automake to
build code for the build architecture instead of the host one.

modules/video_output/xcb/keysym.c

+/*
+ * @file keysym.c
+ * @brief Code generator for X11 key definitions (X11/keysymdef.h)
+ */
+/*****************************************************************************
+ * Copyright © 2009 Rémi Denis-Courmont
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ ****************************************************************************/
+
+#define _GNU_SOURCE 1
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <search.h>
+#include <assert.h>
+
+struct keysym
+{
+    char xname[32];
+    char uname[64];
+    int32_t xsym;
+    int32_t usym;
+};
+
+static int cmpkey (const void *va, const void *vb)
+{
+    const struct keysym *ka = va, *kb = vb;
+
+#if (INT_MAX < 0x7fffffff)
+# error Oups!
+#endif
+    return ka->xsym - kb->xsym;
+}
+
+static void printkey (const void *node, const VISIT which, const int depth)
+{
+    if (which != postorder)
+        return;
+
+    const struct keysym *const *psym = node, *sym = *psym;
+
+#if 1
+    if (sym->xsym <= 0xff) /* Latin-1 */
+        return;
+    if (sym->xsym >= 0x1000100 && sym->xsym <= 0x110ffff) /* Unicode */
+        return;
+#endif
+    printf ("/* XK_%-20s: %s*/\n", sym->xname, sym->uname);
+    printf ("{ 0x%08"PRIx32", 0x%04"PRIx32" },\n", sym->xsym, sym->usym);
+        
+    (void) depth;
+}
+
+static int parse (FILE *in)
+{
+    void *root = NULL;
+    char *line = NULL;
+    size_t buflen = 0;
+    ssize_t len;
+
+    while ((len = getline (&line, &buflen, in)) != -1)
+    {
+        struct keysym *sym = malloc (sizeof (*sym));
+        if (sym == NULL)
+            abort ();
+
+        int val = sscanf (line,
+                          "#define XK_%31s %"SCNi32" /*%*cU+%"SCNx32" %63[^*]",
+                          sym->xname, &sym->xsym, &sym->usym, sym->uname);
+        if (val < 3)
+        {
+            free (sym);
+            continue;
+        }
+        if (val < 4)
+            sym->uname[0] = '\0';
+
+        struct keysym **psym = tsearch (sym, &root, cmpkey);
+        if (psym == NULL)
+            abort ();
+        if (*psym != sym)
+            free (sym); /* Duplicate entry */
+    }
+    free (line);
+
+    puts ("/* This file is generated automatically. Do not edit! */");
+    puts ("/* Entries are sorted from the smallest to the largest XK */");
+    twalk (root, printkey);
+    tdestroy (root, free);
+
+    if (ferror (in))
+    {
+        perror ("Read error");
+        return 1;
+    }
+
+    return 0;
+}
+
+int main (void)
+{
+    return -parse (stdin);
+}