1 files changed, 145 insertions, 0 deletions
diff --git a/lib/unistring/unistr/u8-to-u16.c b/lib/unistring/unistr/u8-to-u16.c
new file mode 100644
index 0000000..ef728ff
--- /dev/null
+++ b/lib/unistring/unistr/u8-to-u16.c
@@ -0,0 +1,145 @@
+/* Convert UTF-8 string to UTF-16 string.
+   Copyright (C) 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+   This program is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * 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.
+
+   or both in parallel, as here.
+   This program 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unistr.h"
+
+#define FUNC u8_to_u16
+#define SRC_UNIT uint8_t
+#define DST_UNIT uint16_t
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+DST_UNIT *
+FUNC (const SRC_UNIT *s, size_t n, DST_UNIT *resultbuf, size_t *lengthp)
+{
+  const SRC_UNIT *s_end = s + n;
+  /* Output string accumulator.  */
+  DST_UNIT *result;
+  size_t allocated;
+  size_t length;
+
+  if (resultbuf != NULL)
+    {
+      result = resultbuf;
+      allocated = *lengthp;
+    }
+  else
+    {
+      result = NULL;
+      allocated = 0;
+    }
+  length = 0;
+  /* Invariants:
+     result is either == resultbuf or == NULL or malloc-allocated.
+     If length > 0, then result != NULL.  */
+
+  while (s < s_end)
+    {
+      ucs4_t uc;
+      int count;
+
+      /* Fetch a Unicode character from the input string.  */
+      count = u8_mbtoucr (&uc, s, s_end - s);
+      if (count < 0)
+        {
+          if (!(result == resultbuf || result == NULL))
+            free (result);
+          errno = EILSEQ;
+          return NULL;
+        }
+      s += count;
+
+      /* Store it in the output string.  */
+      count = u16_uctomb (result + length, uc, allocated - length);
+      if (count == -1)
+        {
+          if (!(result == resultbuf || result == NULL))
+            free (result);
+          errno = EILSEQ;
+          return NULL;
+        }
+      if (count == -2)
+        {
+          DST_UNIT *memory;
+
+          allocated = (allocated > 0 ? 2 * allocated : 12);
+          if (length + 2 > allocated)
+            allocated = length + 2;
+          if (result == resultbuf || result == NULL)
+            memory = (DST_UNIT *) malloc (allocated * sizeof (DST_UNIT));
+          else
+            memory =
+              (DST_UNIT *) realloc (result, allocated * sizeof (DST_UNIT));
+
+          if (memory == NULL)
+            {
+              if (!(result == resultbuf || result == NULL))
+                free (result);
+              errno = ENOMEM;
+              return NULL;
+            }
+          if (result == resultbuf && length > 0)
+            memcpy ((char *) memory, (char *) result,
+                    length * sizeof (DST_UNIT));
+          result = memory;
+          count = u16_uctomb (result + length, uc, allocated - length);
+          if (count < 0)
+            abort ();
+        }
+      length += count;
+    }
+
+  if (length == 0)
+    {
+      if (result == NULL)
+        {
+          /* Return a non-NULL value.  NULL means error.  */
+          result = (DST_UNIT *) malloc (1);
+          if (result == NULL)
+            {
+              errno = ENOMEM;
+              return NULL;
+            }
+        }
+    }
+  else if (result != resultbuf && length < allocated)
+    {
+      /* Shrink the allocated memory if possible.  */
+      DST_UNIT *memory;
+
+      memory = (DST_UNIT *) realloc (result, length * sizeof (DST_UNIT));
+      if (memory != NULL)
+        result = memory;
+    }
+
+  *lengthp = length;
+  return result;
+}