X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=glib%2Fguniprop.c;h=98dff2157170ab7ad5503788e5b594ea7c390eab;hb=35eaf037bdfca985abf5d349e7355f1d2ed9c77b;hp=8603a81b2b98cd1a9f15cd7a7873750dd4dc0406;hpb=8b75e12b138827b0bcc7516184a5fce2fb6f35a9;p=platform%2Fupstream%2Fglib.git

diff --git a/glib/guniprop.c b/glib/guniprop.c
index 8603a81..98dff21 100644
--- a/glib/guniprop.c
+++ b/glib/guniprop.c
@@ -14,20 +14,28 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <stddef.h>
 #include <string.h>
 #include <locale.h>
 
-#include "glib.h"
+#include "gmem.h"
+#include "gstring.h"
+#include "gtestutils.h"
+#include "gtypes.h"
+#include "gunicode.h"
 #include "gunichartables.h"
+#include "gmirroringtable.h"
+#include "gscripttable.h"
 #include "gunicodeprivate.h"
+#ifdef G_OS_WIN32
+#include "gwin32.h"
+#endif
 
 #define ATTR_TABLE(Page) (((Page) <= G_UNICODE_LAST_PAGE_PART1) \
                           ? attr_table_part1[Page] \
@@ -54,20 +62,37 @@
       : G_UNICODE_UNASSIGNED))
 
 
-#define ISDIGIT(Type) ((Type) == G_UNICODE_DECIMAL_NUMBER	\
-		       || (Type) == G_UNICODE_LETTER_NUMBER	\
-		       || (Type) == G_UNICODE_OTHER_NUMBER)
+#define IS(Type, Class)	(((guint)1 << (Type)) & (Class))
+#define OR(Type, Rest)	(((guint)1 << (Type)) | (Rest))
 
-#define ISALPHA(Type) ((Type) == G_UNICODE_LOWERCASE_LETTER	\
-		       || (Type) == G_UNICODE_UPPERCASE_LETTER	\
-		       || (Type) == G_UNICODE_TITLECASE_LETTER	\
-		       || (Type) == G_UNICODE_MODIFIER_LETTER	\
-		       || (Type) == G_UNICODE_OTHER_LETTER)
 
-#define ISMARK(Type) ((Type) == G_UNICODE_NON_SPACING_MARK ||	\
-		      (Type) == G_UNICODE_COMBINING_MARK ||	\
-		      (Type) == G_UNICODE_ENCLOSING_MARK)
-		      
+
+#define ISALPHA(Type)	IS ((Type),				\
+			    OR (G_UNICODE_LOWERCASE_LETTER,	\
+			    OR (G_UNICODE_UPPERCASE_LETTER,	\
+			    OR (G_UNICODE_TITLECASE_LETTER,	\
+			    OR (G_UNICODE_MODIFIER_LETTER,	\
+			    OR (G_UNICODE_OTHER_LETTER,		0))))))
+
+#define ISALDIGIT(Type)	IS ((Type),				\
+			    OR (G_UNICODE_DECIMAL_NUMBER,	\
+			    OR (G_UNICODE_LETTER_NUMBER,	\
+			    OR (G_UNICODE_OTHER_NUMBER,		\
+			    OR (G_UNICODE_LOWERCASE_LETTER,	\
+			    OR (G_UNICODE_UPPERCASE_LETTER,	\
+			    OR (G_UNICODE_TITLECASE_LETTER,	\
+			    OR (G_UNICODE_MODIFIER_LETTER,	\
+			    OR (G_UNICODE_OTHER_LETTER,		0)))))))))
+
+#define ISMARK(Type)	IS ((Type),				\
+			    OR (G_UNICODE_NON_SPACING_MARK,	\
+			    OR (G_UNICODE_SPACING_MARK,	\
+			    OR (G_UNICODE_ENCLOSING_MARK,	0))))
+
+#define ISZEROWIDTHTYPE(Type)	IS ((Type),			\
+			    OR (G_UNICODE_NON_SPACING_MARK,	\
+			    OR (G_UNICODE_ENCLOSING_MARK,	\
+			    OR (G_UNICODE_FORMAT,		0))))
 
 /**
  * g_unichar_isalnum:
@@ -77,13 +102,12 @@
  * Given some UTF-8 text, obtain a character value
  * with g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is an alphanumeric character
+ * Returns: %TRUE if @c is an alphanumeric character
  **/
 gboolean
 g_unichar_isalnum (gunichar c)
 {
-  int t = TYPE (c);
-  return ISDIGIT (t) || ISALPHA (t);
+  return ISALDIGIT (TYPE (c)) ? TRUE : FALSE;
 }
 
 /**
@@ -94,13 +118,12 @@ g_unichar_isalnum (gunichar c)
  * Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is an alphabetic character
+ * Returns: %TRUE if @c is an alphabetic character
  **/
 gboolean
 g_unichar_isalpha (gunichar c)
 {
-  int t = TYPE (c);
-  return ISALPHA (t);
+  return ISALPHA (TYPE (c)) ? TRUE : FALSE;
 }
 
 
@@ -112,7 +135,7 @@ g_unichar_isalpha (gunichar c)
  * Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is a control character
+ * Returns: %TRUE if @c is a control character
  **/
 gboolean
 g_unichar_iscntrl (gunichar c)
@@ -128,7 +151,7 @@ g_unichar_iscntrl (gunichar c)
  * covers ASCII 0-9 and also digits in other languages/scripts.  Given
  * some UTF-8 text, obtain a character value with g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is a digit
+ * Returns: %TRUE if @c is a digit
  **/
 gboolean
 g_unichar_isdigit (gunichar c)
@@ -147,18 +170,18 @@ g_unichar_isdigit (gunichar c)
  * spaces. Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is printable unless it's a space
+ * Returns: %TRUE if @c is printable unless it's a space
  **/
 gboolean
 g_unichar_isgraph (gunichar c)
 {
-  int t = TYPE (c);
-  return (t != G_UNICODE_CONTROL
-	  && t != G_UNICODE_FORMAT
-	  && t != G_UNICODE_UNASSIGNED
-	  && t != G_UNICODE_PRIVATE_USE
-	  && t != G_UNICODE_SURROGATE
-	  && t != G_UNICODE_SPACE_SEPARATOR);
+  return !IS (TYPE(c),
+	      OR (G_UNICODE_CONTROL,
+	      OR (G_UNICODE_FORMAT,
+	      OR (G_UNICODE_UNASSIGNED,
+	      OR (G_UNICODE_SURROGATE,
+	      OR (G_UNICODE_SPACE_SEPARATOR,
+	     0))))));
 }
 
 /**
@@ -169,7 +192,7 @@ g_unichar_isgraph (gunichar c)
  * Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is a lowercase letter
+ * Returns: %TRUE if @c is a lowercase letter
  **/
 gboolean
 g_unichar_islower (gunichar c)
@@ -187,17 +210,17 @@ g_unichar_islower (gunichar c)
  * Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is printable
+ * Returns: %TRUE if @c is printable
  **/
 gboolean
 g_unichar_isprint (gunichar c)
 {
-  int t = TYPE (c);
-  return (t != G_UNICODE_CONTROL
-	  && t != G_UNICODE_FORMAT
-	  && t != G_UNICODE_UNASSIGNED
-	  && t != G_UNICODE_PRIVATE_USE
-	  && t != G_UNICODE_SURROGATE);
+  return !IS (TYPE(c),
+	      OR (G_UNICODE_CONTROL,
+	      OR (G_UNICODE_FORMAT,
+	      OR (G_UNICODE_UNASSIGNED,
+	      OR (G_UNICODE_SURROGATE,
+	     0)))));
 }
 
 /**
@@ -208,18 +231,24 @@ g_unichar_isprint (gunichar c)
  * Given some UTF-8 text, obtain a character value with
  * g_utf8_get_char().
  * 
- * Return value: %TRUE if @c is a punctuation or symbol character
+ * Returns: %TRUE if @c is a punctuation or symbol character
  **/
 gboolean
 g_unichar_ispunct (gunichar c)
 {
-  int t = TYPE (c);
-  return (t == G_UNICODE_CONNECT_PUNCTUATION || t == G_UNICODE_DASH_PUNCTUATION
-	  || t == G_UNICODE_CLOSE_PUNCTUATION || t == G_UNICODE_FINAL_PUNCTUATION
-	  || t == G_UNICODE_INITIAL_PUNCTUATION || t == G_UNICODE_OTHER_PUNCTUATION
-	  || t == G_UNICODE_OPEN_PUNCTUATION || t == G_UNICODE_CURRENCY_SYMBOL
-	  || t == G_UNICODE_MODIFIER_SYMBOL || t == G_UNICODE_MATH_SYMBOL
-	  || t == G_UNICODE_OTHER_SYMBOL);
+  return IS (TYPE(c),
+	     OR (G_UNICODE_CONNECT_PUNCTUATION,
+	     OR (G_UNICODE_DASH_PUNCTUATION,
+	     OR (G_UNICODE_CLOSE_PUNCTUATION,
+	     OR (G_UNICODE_FINAL_PUNCTUATION,
+	     OR (G_UNICODE_INITIAL_PUNCTUATION,
+	     OR (G_UNICODE_OTHER_PUNCTUATION,
+	     OR (G_UNICODE_OPEN_PUNCTUATION,
+	     OR (G_UNICODE_CURRENCY_SYMBOL,
+	     OR (G_UNICODE_MODIFIER_SYMBOL,
+	     OR (G_UNICODE_MATH_SYMBOL,
+	     OR (G_UNICODE_OTHER_SYMBOL,
+	    0)))))))))))) ? TRUE : FALSE;
 }
 
 /**
@@ -234,7 +263,7 @@ g_unichar_ispunct (gunichar c)
  * Pango or equivalent to get word breaking right, the algorithm
  * is fairly complex.)
  *  
- * Return value: %TRUE if @c is a punctuation character
+ * Returns: %TRUE if @c is a space character
  **/
 gboolean
 g_unichar_isspace (gunichar c)
@@ -251,21 +280,47 @@ g_unichar_isspace (gunichar c)
       
     default:
       {
-        int t = TYPE (c);
-        return (t == G_UNICODE_SPACE_SEPARATOR || t == G_UNICODE_LINE_SEPARATOR
-                || t == G_UNICODE_PARAGRAPH_SEPARATOR);
+	return IS (TYPE(c),
+	           OR (G_UNICODE_SPACE_SEPARATOR,
+	           OR (G_UNICODE_LINE_SEPARATOR,
+                   OR (G_UNICODE_PARAGRAPH_SEPARATOR,
+		  0)))) ? TRUE : FALSE;
       }
       break;
     }
 }
 
 /**
+ * g_unichar_ismark:
+ * @c: a Unicode character
+ *
+ * Determines whether a character is a mark (non-spacing mark,
+ * combining mark, or enclosing mark in Unicode speak).
+ * Given some UTF-8 text, obtain a character value
+ * with g_utf8_get_char().
+ *
+ * Note: in most cases where isalpha characters are allowed,
+ * ismark characters should be allowed to as they are essential
+ * for writing most European languages as well as many non-Latin
+ * scripts.
+ *
+ * Returns: %TRUE if @c is a mark character
+ *
+ * Since: 2.14
+ **/
+gboolean
+g_unichar_ismark (gunichar c)
+{
+  return ISMARK (TYPE (c));
+}
+
+/**
  * g_unichar_isupper:
  * @c: a Unicode character
  * 
  * Determines if a character is uppercase.
  * 
- * Return value: %TRUE if @c is an uppercase character
+ * Returns: %TRUE if @c is an uppercase character
  **/
 gboolean
 g_unichar_isupper (gunichar c)
@@ -284,7 +339,7 @@ g_unichar_isupper (gunichar c)
  * first letter is capitalized. The titlecase form of the DZ
  * digraph is U+01F2 LATIN CAPITAL LETTTER D WITH SMALL LETTER Z.
  * 
- * Return value: %TRUE if the character is titlecase
+ * Returns: %TRUE if the character is titlecase
  **/
 gboolean
 g_unichar_istitle (gunichar c)
@@ -292,8 +347,8 @@ g_unichar_istitle (gunichar c)
   unsigned int i;
   for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
     if (title_table[i][0] == c)
-      return 1;
-  return 0;
+      return TRUE;
+  return FALSE;
 }
 
 /**
@@ -302,15 +357,14 @@ g_unichar_istitle (gunichar c)
  * 
  * Determines if a character is a hexidecimal digit.
  * 
- * Return value: %TRUE if the character is a hexadecimal digit
+ * Returns: %TRUE if the character is a hexadecimal digit
  **/
 gboolean
 g_unichar_isxdigit (gunichar c)
 {
-  int t = TYPE (c);
   return ((c >= 'a' && c <= 'f')
 	  || (c >= 'A' && c <= 'F')
-	  || ISDIGIT (t));
+	  || (TYPE (c) == G_UNICODE_DECIMAL_NUMBER));
 }
 
 /**
@@ -320,13 +374,63 @@ g_unichar_isxdigit (gunichar c)
  * Determines if a given character is assigned in the Unicode
  * standard.
  *
- * Return value: %TRUE if the character has an assigned value
+ * Returns: %TRUE if the character has an assigned value
  **/
 gboolean
 g_unichar_isdefined (gunichar c)
 {
-  int t = TYPE (c);
-  return t != G_UNICODE_UNASSIGNED;
+  return !IS (TYPE(c),
+	      OR (G_UNICODE_UNASSIGNED,
+	      OR (G_UNICODE_SURROGATE,
+	     0)));
+}
+
+/**
+ * g_unichar_iszerowidth:
+ * @c: a Unicode character
+ * 
+ * Determines if a given character typically takes zero width when rendered.
+ * The return value is %TRUE for all non-spacing and enclosing marks
+ * (e.g., combining accents), format characters, zero-width
+ * space, but not U+00AD SOFT HYPHEN.
+ *
+ * A typical use of this function is with one of g_unichar_iswide() or
+ * g_unichar_iswide_cjk() to determine the number of cells a string occupies
+ * when displayed on a grid display (terminals).  However, note that not all
+ * terminals support zero-width rendering of zero-width marks.
+ *
+ * Returns: %TRUE if the character has zero width
+ *
+ * Since: 2.14
+ **/
+gboolean
+g_unichar_iszerowidth (gunichar c)
+{
+  if (G_UNLIKELY (c == 0x00AD))
+    return FALSE;
+
+  if (G_UNLIKELY (ISZEROWIDTHTYPE (TYPE (c))))
+    return TRUE;
+
+  if (G_UNLIKELY ((c >= 0x1160 && c < 0x1200) ||
+		  c == 0x200B))
+    return TRUE;
+
+  return FALSE;
+}
+
+static int
+interval_compare (const void *key, const void *elt)
+{
+  gunichar c = GPOINTER_TO_UINT (key);
+  struct Interval *interval = (struct Interval *)elt;
+
+  if (c < interval->start)
+    return -1;
+  if (c > interval->end)
+    return +1;
+
+  return 0;
 }
 
 /**
@@ -336,35 +440,65 @@ g_unichar_isdefined (gunichar c)
  * Determines if a character is typically rendered in a double-width
  * cell.
  * 
- * Return value: %TRUE if the character is wide
+ * Returns: %TRUE if the character is wide
  **/
-/* This function stolen from Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>.  */
 gboolean
 g_unichar_iswide (gunichar c)
 {
-  if (c < 0x1100)
-    return FALSE;
+  if (bsearch (GUINT_TO_POINTER (c),
+               g_unicode_width_table_wide,
+               G_N_ELEMENTS (g_unicode_width_table_wide),
+               sizeof g_unicode_width_table_wide[0],
+	       interval_compare))
+    return TRUE;
 
-  return (c <= 0x115f  /* Hangul Jamo init. consonants */ 
-          || c == 0x2329 || c == 0x232a     /* angle brackets */
-          || (c >= 0x2e80 && c <= 0xa4cf && (c < 0x302a || c > 0x302f) 
-              && c != 0x303f && c != 0x3099 && c!= 0x309a) /* CJK ... Yi */
-          || (c >= 0xac00 && c <= 0xd7a3)   /* Hangul Syllables */
-          || (c >= 0xf900 && c <= 0xfaff)   /* CJK Compatibility Ideographs */
-          || (c >= 0xfe30 && c <= 0xfe6f)   /* CJK Compatibility Forms */
-          || (c >= 0xff00 && c <= 0xff60)   /* Fullwidth Forms */
-          || (c >= 0xffe0 && c <= 0xffe6)   /* Fullwidth Forms */
-          || (c >= 0x20000 && c <= 0x2fffd) /* CJK extra stuff */
-          || (c >= 0x30000 && c <= 0x3fffd));
+  return FALSE;
+}
+
+
+/**
+ * g_unichar_iswide_cjk:
+ * @c: a Unicode character
+ * 
+ * Determines if a character is typically rendered in a double-width
+ * cell under legacy East Asian locales.  If a character is wide according to
+ * g_unichar_iswide(), then it is also reported wide with this function, but
+ * the converse is not necessarily true. See the
+ * [Unicode Standard Annex #11](http://www.unicode.org/reports/tr11/)
+ * for details.
+ *
+ * If a character passes the g_unichar_iswide() test then it will also pass
+ * this test, but not the other way around.  Note that some characters may
+ * pass both this test and g_unichar_iszerowidth().
+ * 
+ * Returns: %TRUE if the character is wide in legacy East Asian locales
+ *
+ * Since: 2.12
+ */
+gboolean
+g_unichar_iswide_cjk (gunichar c)
+{
+  if (g_unichar_iswide (c))
+    return TRUE;
+
+  if (bsearch (GUINT_TO_POINTER (c), 
+               g_unicode_width_table_ambiguous,
+               G_N_ELEMENTS (g_unicode_width_table_ambiguous),
+               sizeof g_unicode_width_table_ambiguous[0],
+	       interval_compare))
+    return TRUE;
+
+  return FALSE;
 }
 
+
 /**
  * g_unichar_toupper:
  * @c: a Unicode character
  * 
  * Converts a character to uppercase.
  * 
- * Return value: the result of converting @c to uppercase.
+ * Returns: the result of converting @c to uppercase.
  *               If @c is not an lowercase or titlecase character,
  *               or has no upper case equivalent @c is returned unchanged.
  **/
@@ -377,11 +511,14 @@ g_unichar_toupper (gunichar c)
       gunichar val = ATTTABLE (c >> 8, c & 0xff);
       if (val >= 0x1000000)
 	{
-	  const guchar *p = special_case_table + val - 0x1000000;
-	  return g_utf8_get_char (p);
+	  const gchar *p = special_case_table + val - 0x1000000;
+          val = g_utf8_get_char (p);
 	}
-      else
-	return val ? val : c;
+      /* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR,
+       * do not have an uppercase equivalent, in which case val will be
+       * zero. 
+       */
+      return val ? val : c;
     }
   else if (t == G_UNICODE_TITLECASE_LETTER)
     {
@@ -389,7 +526,7 @@ g_unichar_toupper (gunichar c)
       for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
 	{
 	  if (title_table[i][0] == c)
-	    return title_table[i][1];
+	    return title_table[i][1] ? title_table[i][1] : c;
 	}
     }
   return c;
@@ -401,7 +538,7 @@ g_unichar_toupper (gunichar c)
  * 
  * Converts a character to lower case.
  * 
- * Return value: the result of converting @c to lower case.
+ * Returns: the result of converting @c to lower case.
  *               If @c is not an upperlower or titlecase character,
  *               or has no lowercase equivalent @c is returned unchanged.
  **/
@@ -414,11 +551,15 @@ g_unichar_tolower (gunichar c)
       gunichar val = ATTTABLE (c >> 8, c & 0xff);
       if (val >= 0x1000000)
 	{
-	  const guchar *p = special_case_table + val - 0x1000000;
+	  const gchar *p = special_case_table + val - 0x1000000;
 	  return g_utf8_get_char (p);
 	}
       else
-	return val ? val : c;
+	{
+	  /* Not all uppercase letters are guaranteed to have a lowercase
+	   * equivalent.  If this is the case, val will be zero. */
+	  return val ? val : c;
+	}
     }
   else if (t == G_UNICODE_TITLECASE_LETTER)
     {
@@ -438,7 +579,7 @@ g_unichar_tolower (gunichar c)
  * 
  * Converts a character to the titlecase.
  * 
- * Return value: the result of converting @c to titlecase.
+ * Returns: the result of converting @c to titlecase.
  *               If @c is not an uppercase or lowercase character,
  *               @c is returned unchanged.
  **/
@@ -452,9 +593,11 @@ g_unichar_totitle (gunichar c)
 	  || title_table[i][2] == c)
 	return title_table[i][0];
     }
-  return (TYPE (c) == G_UNICODE_LOWERCASE_LETTER
-	  ? ATTTABLE (c >> 8, c & 0xff)
-	  : c);
+    
+  if (TYPE (c) == G_UNICODE_LOWERCASE_LETTER)
+    return g_unichar_toupper (c);
+
+  return c;
 }
 
 /**
@@ -464,7 +607,7 @@ g_unichar_totitle (gunichar c)
  * Determines the numeric value of a character as a decimal
  * digit.
  *
- * Return value: If @c is a decimal digit (according to
+ * Returns: If @c is a decimal digit (according to
  * g_unichar_isdigit()), its numeric value. Otherwise, -1.
  **/
 int
@@ -482,7 +625,7 @@ g_unichar_digit_value (gunichar c)
  * Determines the numeric value of a character as a hexidecimal
  * digit.
  *
- * Return value: If @c is a hex digit (according to
+ * Returns: If @c is a hex digit (according to
  * g_unichar_isxdigit()), its numeric value. Otherwise, -1.
  **/
 int
@@ -503,7 +646,7 @@ g_unichar_xdigit_value (gunichar c)
  * 
  * Classifies a Unicode character by type.
  * 
- * Return value: the type of the character.
+ * Returns: the type of the character.
  **/
 GUnicodeType
 g_unichar_type (gunichar c)
@@ -524,8 +667,20 @@ typedef enum {
 static LocaleType
 get_locale_type (void)
 {
+#ifdef G_OS_WIN32
+  char *tem = g_win32_getlocale ();
+  char locale[2];
+
+  locale[0] = tem[0];
+  locale[1] = tem[1];
+  g_free (tem);
+#else
   const char *locale = setlocale (LC_CTYPE, NULL);
 
+  if (locale == NULL)
+    return LOCALE_NORMAL;
+#endif
+
   switch (locale[0])
     {
    case 'a':
@@ -556,9 +711,8 @@ output_marks (const char **p_inout,
   while (*p)
     {
       gunichar c = g_utf8_get_char (p);
-      int t = TYPE(c);
       
-      if (ISMARK(t))
+      if (ISMARK (TYPE (c)))
 	{
 	  if (!remove_dot || c != 0x307 /* COMBINING DOT ABOVE */)
 	    len += g_unichar_to_utf8 (c, out_buffer ? out_buffer + len : NULL);
@@ -578,7 +732,7 @@ output_special_case (gchar *out_buffer,
 		     int    type,
 		     int    which)
 {
-  const guchar *p = special_case_table + offset;
+  const gchar *p = special_case_table + offset;
   gint len;
 
   if (type != G_UNICODE_TITLECASE_LETTER)
@@ -627,26 +781,25 @@ real_toupper (const gchar *str,
 		   * which could simplify this considerably.
 		   */
 		  gsize decomp_len, i;
-		  gunichar *decomp;
+		  gunichar decomp[G_UNICHAR_MAX_DECOMPOSITION_LENGTH];
 
-		  decomp = g_unicode_canonical_decomposition (c, &decomp_len);
+		  decomp_len = g_unichar_fully_decompose (c, FALSE, decomp, G_N_ELEMENTS (decomp));
 		  for (i=0; i < decomp_len; i++)
 		    {
 		      if (decomp[i] != 0x307 /* COMBINING DOT ABOVE */)
 			len += g_unichar_to_utf8 (g_unichar_toupper (decomp[i]), out_buffer ? out_buffer + len : NULL);
 		    }
-		  g_free (decomp);
 		  
 		  len += output_marks (&p, out_buffer ? out_buffer + len : NULL, TRUE);
 
 		  continue;
 		}
 
-	      if (!ISMARK(t))
+	      if (!ISMARK (t))
 		last_was_i = FALSE;
 	    }
 	}
-      
+
       if (locale_type == LOCALE_TURKIC && c == 'i')
 	{
 	  /* i => LATIN CAPITAL LETTER I WITH DOT ABOVE */
@@ -662,7 +815,10 @@ real_toupper (const gchar *str,
 	  /* And output as GREEK CAPITAL LETTER IOTA */
 	  len += g_unichar_to_utf8 (0x399, out_buffer ? out_buffer + len : NULL); 	  
 	}
-      else if (t == G_UNICODE_LOWERCASE_LETTER || t == G_UNICODE_TITLECASE_LETTER)
+      else if (IS (t,
+		   OR (G_UNICODE_LOWERCASE_LETTER,
+		   OR (G_UNICODE_TITLECASE_LETTER,
+		  0))))
 	{
 	  val = ATTTABLE (c >> 8, c & 0xff);
 
@@ -679,11 +835,17 @@ real_toupper (const gchar *str,
 		  for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
 		    {
 		      if (title_table[i][0] == c)
-			val = title_table[i][1];
+			{
+			  val = title_table[i][1];
+			  break;
+			}
 		    }
 		}
 
-	      len += g_unichar_to_utf8 (val, out_buffer ? out_buffer + len : NULL);
+	      /* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR,
+	       * do not have an uppercase equivalent, in which case val will be
+	       * zero. */
+	      len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL);
 	    }
 	}
       else
@@ -712,7 +874,7 @@ real_toupper (const gchar *str,
  * characters in the string increasing. (For instance, the
  * German ess-zet will be changed to SS.)
  * 
- * Return value: a newly allocated string, with all characters
+ * Returns: a newly allocated string, with all characters
  *    converted to uppercase.  
  **/
 gchar *
@@ -748,7 +910,7 @@ has_more_above (const gchar *str)
 
   while (*p)
     {
-      combining_class = _g_unichar_combining_class (g_utf8_get_char (p));
+      combining_class = g_unichar_combining_class (g_utf8_get_char (p));
       if (combining_class == 230)
         return TRUE;
       else if (combining_class == 0)
@@ -834,7 +996,7 @@ real_tolower (const gchar *str,
 	       * sigma, but I don't think that occurs in real text.
 	       * The test here matches that in ICU.
 	       */
-	      if (ISALPHA(next_type)) /* Lu,Ll,Lt,Lm,Lo */
+	      if (ISALPHA (next_type)) /* Lu,Ll,Lt,Lm,Lo */
 		val = 0x3c3;	/* GREEK SMALL SIGMA */
 	      else
 		val = 0x3c2;	/* GREEK SMALL FINAL SIGMA */
@@ -844,7 +1006,10 @@ real_tolower (const gchar *str,
 
 	  len += g_unichar_to_utf8 (val, out_buffer ? out_buffer + len : NULL);
 	}
-      else if (t == G_UNICODE_UPPERCASE_LETTER || t == G_UNICODE_TITLECASE_LETTER)
+      else if (IS (t,
+		   OR (G_UNICODE_UPPERCASE_LETTER,
+		   OR (G_UNICODE_TITLECASE_LETTER,
+		  0))))
 	{
 	  val = ATTTABLE (c >> 8, c & 0xff);
 
@@ -860,11 +1025,16 @@ real_tolower (const gchar *str,
 		  for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
 		    {
 		      if (title_table[i][0] == c)
-			val = title_table[i][2];
+			{
+			  val = title_table[i][2];
+			  break;
+			}
 		    }
 		}
 
-	      len += g_unichar_to_utf8 (val, out_buffer ? out_buffer + len : NULL);
+	      /* Not all uppercase letters are guaranteed to have a lowercase
+	       * equivalent.  If this is the case, val will be zero. */
+	      len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL);
 	    }
 	}
       else
@@ -892,7 +1062,7 @@ real_tolower (const gchar *str,
  * on the current locale, and may result in the number of
  * characters in the string changing.
  * 
- * Return value: a newly allocated string, with all characters
+ * Returns: a newly allocated string, with all characters
  *    converted to lowercase.  
  **/
 gchar *
@@ -935,16 +1105,19 @@ g_utf8_strdown (const gchar *str,
  * takes case sensitivity into account. GLib does not currently
  * provide such a function.
  * 
- * Return value: a newly allocated string, that is a
+ * Returns: a newly allocated string, that is a
  *   case independent form of @str.
  **/
 gchar *
 g_utf8_casefold (const gchar *str,
 		 gssize       len)
 {
-  GString *result = g_string_new (NULL);
+  GString *result;
   const char *p;
 
+  g_return_val_if_fail (str != NULL, NULL);
+
+  result = g_string_new (NULL);
   p = str;
   while ((len < 0 || p < str + len) && *p)
     {
@@ -984,61 +1157,307 @@ g_utf8_casefold (const gchar *str,
 
 /**
  * g_unichar_get_mirror_char:
- * @ch: a unicode character
+ * @ch: a Unicode character
  * @mirrored_ch: location to store the mirrored character
  * 
- * In Unicode, some characters are <firstterm>mirrored</firstterm>. This
- * means that their images are mirrored horizontally in text that is laid
- * out from right to left. For instance, "(" would become its mirror image,
- * ")", in right-to-left text.
+ * In Unicode, some characters are "mirrored". This means that their
+ * images are mirrored horizontally in text that is laid out from right
+ * to left. For instance, "(" would become its mirror image, ")", in
+ * right-to-left text.
  *
  * If @ch has the Unicode mirrored property and there is another unicode
  * character that typically has a glyph that is the mirror image of @ch's
- * glyph, puts that character in the address pointed to by @mirrored_ch.
+ * glyph and @mirrored_ch is set, it puts that character in the address
+ * pointed to by @mirrored_ch.  Otherwise the original character is put.
  *
- * Return value: %TRUE if @ch has a mirrored character and @mirrored_ch is
- * filled in, %FALSE otherwise
+ * Returns: %TRUE if @ch has a mirrored character, %FALSE otherwise
  *
  * Since: 2.4
  **/
-/* This code is adapted from FriBidi (http://fribidi.sourceforge.net/). 
- * FriBidi is: Copyright (C) 1999,2000 Dov Grobgeld, and
- *             Copyright (C) 2001,2002 Behdad Esfahbod.
- */
 gboolean
 g_unichar_get_mirror_char (gunichar ch,
                            gunichar *mirrored_ch)
 {
-  gint pos, step, size;
   gboolean found;
+  gunichar mirrored;
 
-  size = G_N_ELEMENTS (bidi_mirroring_table);
-  pos = step = (size / 2) + 1;
+  mirrored = GLIB_GET_MIRRORING(ch);
 
-  while (step > 1)
-    {
-      gunichar cmp_ch = bidi_mirroring_table[pos].ch;
-      step = (step + 1) / 2;
+  found = ch != mirrored;
+  if (mirrored_ch)
+    *mirrored_ch = mirrored;
 
-      if (cmp_ch < ch)
-        {
-          pos += step;
-          if (pos > size - 1)
-            pos = size - 1;
-        }
-      else if (cmp_ch > ch)
-        {
-          pos -= step;
-          if (pos < 0)
-            pos = 0;
-        }
+  return found;
+
+}
+
+#define G_SCRIPT_TABLE_MIDPOINT (G_N_ELEMENTS (g_script_table) / 2)
+
+static inline GUnicodeScript
+g_unichar_get_script_bsearch (gunichar ch)
+{
+  int lower = 0;
+  int upper = G_N_ELEMENTS (g_script_table) - 1;
+  static int saved_mid = G_SCRIPT_TABLE_MIDPOINT;
+  int mid = saved_mid;
+
+
+  do 
+    {
+      if (ch < g_script_table[mid].start)
+	upper = mid - 1;
+      else if (ch >= g_script_table[mid].start + g_script_table[mid].chars)
+	lower = mid + 1;
       else
-        break;
+	return g_script_table[saved_mid = mid].script;
+
+      mid = (lower + upper) / 2;
     }
-  found = bidi_mirroring_table[pos].ch == ch;
-  if (mirrored_ch)
-    *mirrored_ch = found ? bidi_mirroring_table[pos].mirrored_ch : ch;
+  while (lower <= upper);
 
-  return found;
+  return G_UNICODE_SCRIPT_UNKNOWN;
+}
+
+/**
+ * g_unichar_get_script:
+ * @ch: a Unicode character
+ * 
+ * Looks up the #GUnicodeScript for a particular character (as defined 
+ * by Unicode Standard Annex \#24). No check is made for @ch being a
+ * valid Unicode character; if you pass in invalid character, the
+ * result is undefined.
+ *
+ * This function is equivalent to pango_script_for_unichar() and the
+ * two are interchangeable.
+ * 
+ * Returns: the #GUnicodeScript for the character.
+ *
+ * Since: 2.14
+ */
+GUnicodeScript
+g_unichar_get_script (gunichar ch)
+{
+  if (ch < G_EASY_SCRIPTS_RANGE)
+    return g_script_easy_table[ch];
+  else 
+    return g_unichar_get_script_bsearch (ch); 
+}
+
+
+/* http://unicode.org/iso15924/ */
+static const guint32 iso15924_tags[] =
+{
+#define PACK(a,b,c,d) ((guint32)((((guint8)(a))<<24)|(((guint8)(b))<<16)|(((guint8)(c))<<8)|((guint8)(d))))
+
+    PACK ('Z','y','y','y'), /* G_UNICODE_SCRIPT_COMMON */
+    PACK ('Z','i','n','h'), /* G_UNICODE_SCRIPT_INHERITED */
+    PACK ('A','r','a','b'), /* G_UNICODE_SCRIPT_ARABIC */
+    PACK ('A','r','m','n'), /* G_UNICODE_SCRIPT_ARMENIAN */
+    PACK ('B','e','n','g'), /* G_UNICODE_SCRIPT_BENGALI */
+    PACK ('B','o','p','o'), /* G_UNICODE_SCRIPT_BOPOMOFO */
+    PACK ('C','h','e','r'), /* G_UNICODE_SCRIPT_CHEROKEE */
+    PACK ('C','o','p','t'), /* G_UNICODE_SCRIPT_COPTIC */
+    PACK ('C','y','r','l'), /* G_UNICODE_SCRIPT_CYRILLIC */
+    PACK ('D','s','r','t'), /* G_UNICODE_SCRIPT_DESERET */
+    PACK ('D','e','v','a'), /* G_UNICODE_SCRIPT_DEVANAGARI */
+    PACK ('E','t','h','i'), /* G_UNICODE_SCRIPT_ETHIOPIC */
+    PACK ('G','e','o','r'), /* G_UNICODE_SCRIPT_GEORGIAN */
+    PACK ('G','o','t','h'), /* G_UNICODE_SCRIPT_GOTHIC */
+    PACK ('G','r','e','k'), /* G_UNICODE_SCRIPT_GREEK */
+    PACK ('G','u','j','r'), /* G_UNICODE_SCRIPT_GUJARATI */
+    PACK ('G','u','r','u'), /* G_UNICODE_SCRIPT_GURMUKHI */
+    PACK ('H','a','n','i'), /* G_UNICODE_SCRIPT_HAN */
+    PACK ('H','a','n','g'), /* G_UNICODE_SCRIPT_HANGUL */
+    PACK ('H','e','b','r'), /* G_UNICODE_SCRIPT_HEBREW */
+    PACK ('H','i','r','a'), /* G_UNICODE_SCRIPT_HIRAGANA */
+    PACK ('K','n','d','a'), /* G_UNICODE_SCRIPT_KANNADA */
+    PACK ('K','a','n','a'), /* G_UNICODE_SCRIPT_KATAKANA */
+    PACK ('K','h','m','r'), /* G_UNICODE_SCRIPT_KHMER */
+    PACK ('L','a','o','o'), /* G_UNICODE_SCRIPT_LAO */
+    PACK ('L','a','t','n'), /* G_UNICODE_SCRIPT_LATIN */
+    PACK ('M','l','y','m'), /* G_UNICODE_SCRIPT_MALAYALAM */
+    PACK ('M','o','n','g'), /* G_UNICODE_SCRIPT_MONGOLIAN */
+    PACK ('M','y','m','r'), /* G_UNICODE_SCRIPT_MYANMAR */
+    PACK ('O','g','a','m'), /* G_UNICODE_SCRIPT_OGHAM */
+    PACK ('I','t','a','l'), /* G_UNICODE_SCRIPT_OLD_ITALIC */
+    PACK ('O','r','y','a'), /* G_UNICODE_SCRIPT_ORIYA */
+    PACK ('R','u','n','r'), /* G_UNICODE_SCRIPT_RUNIC */
+    PACK ('S','i','n','h'), /* G_UNICODE_SCRIPT_SINHALA */
+    PACK ('S','y','r','c'), /* G_UNICODE_SCRIPT_SYRIAC */
+    PACK ('T','a','m','l'), /* G_UNICODE_SCRIPT_TAMIL */
+    PACK ('T','e','l','u'), /* G_UNICODE_SCRIPT_TELUGU */
+    PACK ('T','h','a','a'), /* G_UNICODE_SCRIPT_THAANA */
+    PACK ('T','h','a','i'), /* G_UNICODE_SCRIPT_THAI */
+    PACK ('T','i','b','t'), /* G_UNICODE_SCRIPT_TIBETAN */
+    PACK ('C','a','n','s'), /* G_UNICODE_SCRIPT_CANADIAN_ABORIGINAL */
+    PACK ('Y','i','i','i'), /* G_UNICODE_SCRIPT_YI */
+    PACK ('T','g','l','g'), /* G_UNICODE_SCRIPT_TAGALOG */
+    PACK ('H','a','n','o'), /* G_UNICODE_SCRIPT_HANUNOO */
+    PACK ('B','u','h','d'), /* G_UNICODE_SCRIPT_BUHID */
+    PACK ('T','a','g','b'), /* G_UNICODE_SCRIPT_TAGBANWA */
+
+  /* Unicode-4.0 additions */
+    PACK ('B','r','a','i'), /* G_UNICODE_SCRIPT_BRAILLE */
+    PACK ('C','p','r','t'), /* G_UNICODE_SCRIPT_CYPRIOT */
+    PACK ('L','i','m','b'), /* G_UNICODE_SCRIPT_LIMBU */
+    PACK ('O','s','m','a'), /* G_UNICODE_SCRIPT_OSMANYA */
+    PACK ('S','h','a','w'), /* G_UNICODE_SCRIPT_SHAVIAN */
+    PACK ('L','i','n','b'), /* G_UNICODE_SCRIPT_LINEAR_B */
+    PACK ('T','a','l','e'), /* G_UNICODE_SCRIPT_TAI_LE */
+    PACK ('U','g','a','r'), /* G_UNICODE_SCRIPT_UGARITIC */
+
+  /* Unicode-4.1 additions */
+    PACK ('T','a','l','u'), /* G_UNICODE_SCRIPT_NEW_TAI_LUE */
+    PACK ('B','u','g','i'), /* G_UNICODE_SCRIPT_BUGINESE */
+    PACK ('G','l','a','g'), /* G_UNICODE_SCRIPT_GLAGOLITIC */
+    PACK ('T','f','n','g'), /* G_UNICODE_SCRIPT_TIFINAGH */
+    PACK ('S','y','l','o'), /* G_UNICODE_SCRIPT_SYLOTI_NAGRI */
+    PACK ('X','p','e','o'), /* G_UNICODE_SCRIPT_OLD_PERSIAN */
+    PACK ('K','h','a','r'), /* G_UNICODE_SCRIPT_KHAROSHTHI */
+
+  /* Unicode-5.0 additions */
+    PACK ('Z','z','z','z'), /* G_UNICODE_SCRIPT_UNKNOWN */
+    PACK ('B','a','l','i'), /* G_UNICODE_SCRIPT_BALINESE */
+    PACK ('X','s','u','x'), /* G_UNICODE_SCRIPT_CUNEIFORM */
+    PACK ('P','h','n','x'), /* G_UNICODE_SCRIPT_PHOENICIAN */
+    PACK ('P','h','a','g'), /* G_UNICODE_SCRIPT_PHAGS_PA */
+    PACK ('N','k','o','o'), /* G_UNICODE_SCRIPT_NKO */
+
+  /* Unicode-5.1 additions */
+    PACK ('K','a','l','i'), /* G_UNICODE_SCRIPT_KAYAH_LI */
+    PACK ('L','e','p','c'), /* G_UNICODE_SCRIPT_LEPCHA */
+    PACK ('R','j','n','g'), /* G_UNICODE_SCRIPT_REJANG */
+    PACK ('S','u','n','d'), /* G_UNICODE_SCRIPT_SUNDANESE */
+    PACK ('S','a','u','r'), /* G_UNICODE_SCRIPT_SAURASHTRA */
+    PACK ('C','h','a','m'), /* G_UNICODE_SCRIPT_CHAM */
+    PACK ('O','l','c','k'), /* G_UNICODE_SCRIPT_OL_CHIKI */
+    PACK ('V','a','i','i'), /* G_UNICODE_SCRIPT_VAI */
+    PACK ('C','a','r','i'), /* G_UNICODE_SCRIPT_CARIAN */
+    PACK ('L','y','c','i'), /* G_UNICODE_SCRIPT_LYCIAN */
+    PACK ('L','y','d','i'), /* G_UNICODE_SCRIPT_LYDIAN */
+
+  /* Unicode-5.2 additions */
+    PACK ('A','v','s','t'), /* G_UNICODE_SCRIPT_AVESTAN */
+    PACK ('B','a','m','u'), /* G_UNICODE_SCRIPT_BAMUM */
+    PACK ('E','g','y','p'), /* G_UNICODE_SCRIPT_EGYPTIAN_HIEROGLYPHS */
+    PACK ('A','r','m','i'), /* G_UNICODE_SCRIPT_IMPERIAL_ARAMAIC */
+    PACK ('P','h','l','i'), /* G_UNICODE_SCRIPT_INSCRIPTIONAL_PAHLAVI */
+    PACK ('P','r','t','i'), /* G_UNICODE_SCRIPT_INSCRIPTIONAL_PARTHIAN */
+    PACK ('J','a','v','a'), /* G_UNICODE_SCRIPT_JAVANESE */
+    PACK ('K','t','h','i'), /* G_UNICODE_SCRIPT_KAITHI */
+    PACK ('L','i','s','u'), /* G_UNICODE_SCRIPT_LISU */
+    PACK ('M','t','e','i'), /* G_UNICODE_SCRIPT_MEETEI_MAYEK */
+    PACK ('S','a','r','b'), /* G_UNICODE_SCRIPT_OLD_SOUTH_ARABIAN */
+    PACK ('O','r','k','h'), /* G_UNICODE_SCRIPT_OLD_TURKIC */
+    PACK ('S','a','m','r'), /* G_UNICODE_SCRIPT_SAMARITAN */
+    PACK ('L','a','n','a'), /* G_UNICODE_SCRIPT_TAI_THAM */
+    PACK ('T','a','v','t'), /* G_UNICODE_SCRIPT_TAI_VIET */
+
+  /* Unicode-6.0 additions */
+    PACK ('B','a','t','k'), /* G_UNICODE_SCRIPT_BATAK */
+    PACK ('B','r','a','h'), /* G_UNICODE_SCRIPT_BRAHMI */
+    PACK ('M','a','n','d'), /* G_UNICODE_SCRIPT_MANDAIC */
+
+  /* Unicode-6.1 additions */
+    PACK ('C','a','k','m'), /* G_UNICODE_SCRIPT_CHAKMA */
+    PACK ('M','e','r','c'), /* G_UNICODE_SCRIPT_MEROITIC_CURSIVE */
+    PACK ('M','e','r','o'), /* G_UNICODE_SCRIPT_MEROITIC_HIEROGLYPHS */
+    PACK ('P','l','r','d'), /* G_UNICODE_SCRIPT_MIAO */
+    PACK ('S','h','r','d'), /* G_UNICODE_SCRIPT_SHARADA */
+    PACK ('S','o','r','a'), /* G_UNICODE_SCRIPT_SORA_SOMPENG */
+    PACK ('T','a','k','r'), /* G_UNICODE_SCRIPT_TAKRI */
+
+  /* Unicode 7.0 additions */
+    PACK ('B','a','s','s'), /* G_UNICODE_SCRIPT_BASSA_VAH */
+    PACK ('A','g','h','b'), /* G_UNICODE_SCRIPT_CAUCASIAN_ALBANIAN */
+    PACK ('D','u','p','l'), /* G_UNICODE_SCRIPT_DUPLOYAN */
+    PACK ('E','l','b','a'), /* G_UNICODE_SCRIPT_ELBASAN */
+    PACK ('G','r','a','n'), /* G_UNICODE_SCRIPT_GRANTHA */
+    PACK ('K','h','o','j'), /* G_UNICODE_SCRIPT_KHOJKI*/
+    PACK ('S','i','n','d'), /* G_UNICODE_SCRIPT_KHUDAWADI */
+    PACK ('L','i','n','a'), /* G_UNICODE_SCRIPT_LINEAR_A */
+    PACK ('M','a','h','j'), /* G_UNICODE_SCRIPT_MAHAJANI */
+    PACK ('M','a','n','u'), /* G_UNICODE_SCRIPT_MANICHAEAN */
+    PACK ('M','e','n','d'), /* G_UNICODE_SCRIPT_MENDE_KIKAKUI */
+    PACK ('M','o','d','i'), /* G_UNICODE_SCRIPT_MODI */
+    PACK ('M','r','o','o'), /* G_UNICODE_SCRIPT_MRO */
+    PACK ('N','b','a','t'), /* G_UNICODE_SCRIPT_NABATAEAN */
+    PACK ('N','a','r','b'), /* G_UNICODE_SCRIPT_OLD_NORTH_ARABIAN */
+    PACK ('P','e','r','m'), /* G_UNICODE_SCRIPT_OLD_PERMIC */
+    PACK ('H','m','n','g'), /* G_UNICODE_SCRIPT_PAHAWH_HMONG */
+    PACK ('P','a','l','m'), /* G_UNICODE_SCRIPT_PALMYRENE */
+    PACK ('P','a','u','c'), /* G_UNICODE_SCRIPT_PAU_CIN_HAU */
+    PACK ('P','h','l','p'), /* G_UNICODE_SCRIPT_PSALTER_PAHLAVI */
+    PACK ('S','i','d','d'), /* G_UNICODE_SCRIPT_SIDDHAM */
+    PACK ('T','i','r','h'), /* G_UNICODE_SCRIPT_TIRHUTA */
+    PACK ('W','a','r','a'), /* G_UNICODE_SCRIPT_WARANG_CITI */
+
+#undef PACK
+};
+
+/**
+ * g_unicode_script_to_iso15924:
+ * @script: a Unicode script
+ *
+ * Looks up the ISO 15924 code for @script.  ISO 15924 assigns four-letter
+ * codes to scripts.  For example, the code for Arabic is 'Arab'.  The
+ * four letter codes are encoded as a @guint32 by this function in a
+ * big-endian fashion.  That is, the code returned for Arabic is
+ * 0x41726162 (0x41 is ASCII code for 'A', 0x72 is ASCII code for 'r', etc).
+ *
+ * See
+ * [Codes for the representation of names of scripts](http://unicode.org/iso15924/codelists.html)
+ * for details.
+ *
+ * Returns: the ISO 15924 code for @script, encoded as an integer,
+ *   of zero if @script is %G_UNICODE_SCRIPT_INVALID_CODE or
+ *   ISO 15924 code 'Zzzz' (script code for UNKNOWN) if @script is not understood.
+ *
+ * Since: 2.30
+ */
+guint32
+g_unicode_script_to_iso15924 (GUnicodeScript script)
+{
+  if (G_UNLIKELY (script == G_UNICODE_SCRIPT_INVALID_CODE))
+    return 0;
+
+  if (G_UNLIKELY (script < 0 || script >= (int) G_N_ELEMENTS (iso15924_tags)))
+    return 0x5A7A7A7A;
+
+  return iso15924_tags[script];
+}
+
+/**
+ * g_unicode_script_from_iso15924:
+ * @iso15924: a Unicode script
+ *
+ * Looks up the Unicode script for @iso15924.  ISO 15924 assigns four-letter
+ * codes to scripts.  For example, the code for Arabic is 'Arab'.
+ * This function accepts four letter codes encoded as a @guint32 in a
+ * big-endian fashion.  That is, the code expected for Arabic is
+ * 0x41726162 (0x41 is ASCII code for 'A', 0x72 is ASCII code for 'r', etc).
+ *
+ * See
+ * [Codes for the representation of names of scripts](http://unicode.org/iso15924/codelists.html)
+ * for details.
+ *
+ * Returns: the Unicode script for @iso15924, or
+ *   of %G_UNICODE_SCRIPT_INVALID_CODE if @iso15924 is zero and
+ *   %G_UNICODE_SCRIPT_UNKNOWN if @iso15924 is unknown.
+ *
+ * Since: 2.30
+ */
+GUnicodeScript
+g_unicode_script_from_iso15924 (guint32 iso15924)
+{
+  unsigned int i;
+
+   if (!iso15924)
+     return G_UNICODE_SCRIPT_INVALID_CODE;
+
+  for (i = 0; i < G_N_ELEMENTS (iso15924_tags); i++)
+    if (iso15924_tags[i] == iso15924)
+      return (GUnicodeScript) i;
 
+  return G_UNICODE_SCRIPT_UNKNOWN;
 }