Update utf8proc to v2.9.0

Unicode 15.1 support

compat/utf8proc.c

@@ -101,7 +101,7 @@ UTF8PROC_DLLEXPORT const char *utf8proc_version(void) {
 }
 
 UTF8PROC_DLLEXPORT const char *utf8proc_unicode_version(void) {
-  return "15.0.0";
+  return "15.1.0";
 }
 
 UTF8PROC_DLLEXPORT const char *utf8proc_errmsg(utf8proc_ssize_t errcode) {
@@ -288,35 +288,54 @@ static utf8proc_bool grapheme_break_simple(int lbc, int tbc) {
     true; // GB999
 }
 
-static utf8proc_bool grapheme_break_extended(int lbc, int tbc, utf8proc_int32_t *state)
+static utf8proc_bool grapheme_break_extended(int lbc, int tbc, int licb, int ticb, utf8proc_int32_t *state)
 {
   if (state) {
-    int lbc_override;
-    if (*state == UTF8PROC_BOUNDCLASS_START)
-      *state = lbc_override = lbc;
-    else
-      lbc_override = *state;
-    utf8proc_bool break_permitted = grapheme_break_simple(lbc_override, tbc);
+    int state_bc, state_icb; /* boundclass and indic_conjunct_break state */
+    if (*state == 0) { /* state initialization */
+      state_bc = lbc;
+      state_icb = licb == UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT ? licb : UTF8PROC_INDIC_CONJUNCT_BREAK_NONE;
+    }
+    else { /* lbc and licb are already encoded in *state */
+      state_bc = *state & 0xff;  // 1st byte of state is bound class
+      state_icb = *state >> 8;   // 2nd byte of state is indic conjunct break
+    }
+
+    utf8proc_bool break_permitted = grapheme_break_simple(state_bc, tbc) &&
+       !(state_icb == UTF8PROC_INDIC_CONJUNCT_BREAK_LINKER
+        && ticb == UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT); // GB9c
+
+    // Special support for GB9c.  Don't break between two consonants
+    // separated 1+ linker characters and 0+ extend characters in any order.
+    // After a consonant, we enter LINKER state after at least one linker.
+    if (ticb == UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT
+        || state_icb == UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT
+        || state_icb == UTF8PROC_INDIC_CONJUNCT_BREAK_EXTEND)
+      state_icb = ticb;
+    else if (state_icb == UTF8PROC_INDIC_CONJUNCT_BREAK_LINKER)
+      state_icb = ticb == UTF8PROC_INDIC_CONJUNCT_BREAK_EXTEND ?
+                  UTF8PROC_INDIC_CONJUNCT_BREAK_LINKER : ticb;
 
     // Special support for GB 12/13 made possible by GB999. After two RI
     // class codepoints we want to force a break. Do this by resetting the
     // second RI's bound class to UTF8PROC_BOUNDCLASS_OTHER, to force a break
     // after that character according to GB999 (unless of course such a break is
     // forbidden by a different rule such as GB9).
-    if (*state == tbc && tbc == UTF8PROC_BOUNDCLASS_REGIONAL_INDICATOR)
-      *state = UTF8PROC_BOUNDCLASS_OTHER;
+    if (state_bc == tbc && tbc == UTF8PROC_BOUNDCLASS_REGIONAL_INDICATOR)
+      state_bc = UTF8PROC_BOUNDCLASS_OTHER;
     // Special support for GB11 (emoji extend* zwj / emoji)
-    else if (*state == UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC) {
+    else if (state_bc == UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC) {
       if (tbc == UTF8PROC_BOUNDCLASS_EXTEND) // fold EXTEND codepoints into emoji
-        *state = UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC;
+        state_bc = UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC;
       else if (tbc == UTF8PROC_BOUNDCLASS_ZWJ)
-        *state = UTF8PROC_BOUNDCLASS_E_ZWG; // state to record emoji+zwg combo
+        state_bc = UTF8PROC_BOUNDCLASS_E_ZWG; // state to record emoji+zwg combo
       else
-        *state = tbc;
+        state_bc = tbc;
     }
     else
-      *state = tbc;
+      state_bc = tbc;
 
+    *state = state_bc + (state_icb << 8);
     return break_permitted;
   }
   else
@@ -326,8 +345,12 @@ static utf8proc_bool grapheme_break_extended(int lbc, int tbc, utf8proc_int32_t
 UTF8PROC_DLLEXPORT utf8proc_bool utf8proc_grapheme_break_stateful(
     utf8proc_int32_t c1, utf8proc_int32_t c2, utf8proc_int32_t *state) {
 
-  return grapheme_break_extended(utf8proc_get_property(c1)->boundclass,
-                                 utf8proc_get_property(c2)->boundclass,
+  const utf8proc_property_t *p1 = utf8proc_get_property(c1);
+  const utf8proc_property_t *p2 = utf8proc_get_property(c2);
+  return grapheme_break_extended(p1->boundclass,
+                                 p2->boundclass,
+                                 p1->indic_conjunct_break,
+                                 p2->indic_conjunct_break,
                                  state);
 }
 
@@ -498,8 +521,8 @@ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_decompose_char(utf8proc_int32_t uc,
   }
   if (options & UTF8PROC_CHARBOUND) {
     utf8proc_bool boundary;
-    int tbc = property->boundclass;
-    boundary = grapheme_break_extended(*last_boundclass, tbc, last_boundclass);
+    boundary = grapheme_break_extended(0, property->boundclass, 0, property->indic_conjunct_break,
+                                       last_boundclass);
     if (boundary) {
       if (bufsize >= 1) dst[0] = -1; /* sentinel value for grapheme break */
       if (bufsize >= 2) dst[1] = uc;

compat/utf8proc.h

@@ -71,7 +71,7 @@
 /** The MAJOR version number (increased when backwards API compatibility is broken). */
 #define UTF8PROC_VERSION_MAJOR 2
 /** The MINOR version number (increased when new functionality is added in a backwards-compatible manner). */
-#define UTF8PROC_VERSION_MINOR 8
+#define UTF8PROC_VERSION_MINOR 9
 /** The PATCH version (increased for fixes that do not change the API). */
 #define UTF8PROC_VERSION_PATCH 0
 /** @} */
@@ -273,7 +273,8 @@ typedef struct utf8proc_property_struct {
    * Boundclass.
    * @see utf8proc_boundclass_t.
    */
-  unsigned boundclass:8;
+  unsigned boundclass:6;
+  unsigned indic_conjunct_break:2;
 } utf8proc_property_t;
 
 /** Unicode categories. */
@@ -388,6 +389,14 @@ typedef enum {
   UTF8PROC_BOUNDCLASS_E_ZWG = 20, /* UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC + ZWJ */
 } utf8proc_boundclass_t;
 
+/** Indic_Conjunct_Break property. (TR44) */
+typedef enum {
+  UTF8PROC_INDIC_CONJUNCT_BREAK_NONE = 0,
+  UTF8PROC_INDIC_CONJUNCT_BREAK_LINKER = 1,
+  UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT = 2,
+  UTF8PROC_INDIC_CONJUNCT_BREAK_EXTEND = 3,
+} utf8proc_indic_conjunct_break_t;
+
 /**
  * Function pointer type passed to @ref utf8proc_map_custom and
  * @ref utf8proc_decompose_custom, which is used to specify a user-defined
@@ -481,8 +490,9 @@ UTF8PROC_DLLEXPORT const utf8proc_property_t *utf8proc_get_property(utf8proc_int
  * - @ref UTF8PROC_STRIPNA   - remove unassigned codepoints
  * @param last_boundclass
  * Pointer to an integer variable containing
- * the previous codepoint's boundary class if the @ref UTF8PROC_CHARBOUND
- * option is used.  Otherwise, this parameter is ignored.
+ * the previous codepoint's (boundclass + indic_conjunct_break << 1) if the @ref UTF8PROC_CHARBOUND
+ * option is used.  If the string is being processed in order, this can be initialized to 0 for
+ * the beginning of the string, and is thereafter updated automatically.  Otherwise, this parameter is ignored.
  *
  * @return
  * In case of success, the number of codepoints written is returned; in case