unilbrk: Update handling of regional indicators for Unicode 10.0.0.

* lib/unilbrk/u8-possible-linebreaks.c (u8_possible_linebreaks): Add
code for handling regional indicators.
* lib/unilbrk/u16-possible-linebreaks.c (u16_possible_linebreaks):
Likewise.
* lib/unilbrk/u32-possible-linebreaks.c (u32_possible_linebreaks):
Likewise.
* tests/unilbrk/test-u8-possible-linebreaks.c (main): Add a test
regarding regional indicators.
* tests/unilbrk/test-u16-possible-linebreaks.c (main): Likewise.
* tests/unilbrk/test-u32-possible-linebreaks.c (main): Likewise.

3 files changed, 45 insertions, 0 deletions

diff --git a/tests/unilbrk/test-u16-possible-linebreaks.c b/tests/unilbrk/test-u16-possible-linebreaks.c
index d8dd863472..87d712fcc6 100644
--- a/tests/unilbrk/test-u16-possible-linebreaks.c
+++ b/tests/unilbrk/test-u16-possible-linebreaks.c
@@ -164,5 +164,20 @@ main ()
     free (p);
   }
 
+  /* Test line breaking of regional indicators.  */
+  {
+    static const uint16_t input[8] =
+      { 0xD83C, 0xDDE9, 0xD83C, 0xDDEA, 0xD83C, 0xDDEB, 0xD83C, 0xDDF7 };
+    char *p = (char *) malloc (SIZEOF (input));
+    size_t i;
+
+    u16_possible_linebreaks (input, SIZEOF (input), "UTF-8", p);
+    for (i = 0; i < 8; i++)
+      {
+        ASSERT (p[i] == (i == 4 ? UC_BREAK_POSSIBLE : UC_BREAK_PROHIBITED));
+      }
+    free (p);
+  }
+
   return 0;
 }
diff --git a/tests/unilbrk/test-u32-possible-linebreaks.c b/tests/unilbrk/test-u32-possible-linebreaks.c
index 97c08ad5a9..c140ca3b55 100644
--- a/tests/unilbrk/test-u32-possible-linebreaks.c
+++ b/tests/unilbrk/test-u32-possible-linebreaks.c
@@ -164,5 +164,20 @@ main ()
     free (p);
   }
 
+  /* Test line breaking of regional indicators.  */
+  {
+    static const uint32_t input[4] =
+      { 0x1F1E9, 0x1F1EA, 0x1F1EB, 0x1F1F7 };
+    char *p = (char *) malloc (SIZEOF (input));
+    size_t i;
+
+    u32_possible_linebreaks (input, SIZEOF (input), "UTF-8", p);
+    for (i = 0; i < 4; i++)
+      {
+        ASSERT (p[i] == (i == 2 ? UC_BREAK_POSSIBLE : UC_BREAK_PROHIBITED));
+      }
+    free (p);
+  }
+
   return 0;
 }
diff --git a/tests/unilbrk/test-u8-possible-linebreaks.c b/tests/unilbrk/test-u8-possible-linebreaks.c
index 9dd5666954..0fdb66d367 100644
--- a/tests/unilbrk/test-u8-possible-linebreaks.c
+++ b/tests/unilbrk/test-u8-possible-linebreaks.c
@@ -149,5 +149,20 @@ main ()
     free (p);
   }
 
+  /* Test line breaking of regional indicators.  */
+  {
+    static const uint8_t input[16] =
+      "\360\237\207\251\360\237\207\252\360\237\207\253\360\237\207\267";
+    char *p = (char *) malloc (SIZEOF (input));
+    size_t i;
+
+    u8_possible_linebreaks (input, SIZEOF (input), "UTF-8", p);
+    for (i = 0; i < 16; i++)
+      {
+        ASSERT (p[i] == (i == 8 ? UC_BREAK_POSSIBLE : UC_BREAK_PROHIBITED));
+      }
+    free (p);
+  }
+
   return 0;
 }