1 files changed, 150 insertions, 0 deletions
diff --git a/lib/unistr/u8-mbtouc-unsafe.c b/lib/unistr/u8-mbtouc-unsafe.c
new file mode 100644
index 0000000..9ddcdde
--- /dev/null
+++ b/lib/unistr/u8-mbtouc-unsafe.c
@@ -0,0 +1,150 @@
+/* Look at first character in UTF-8 string.
+   Copyright (C) 1999-2002, 2006-2007, 2009-2020 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2001.
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+
+   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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#if defined IN_LIBUNISTRING
+/* Tell unistr.h to declare u8_mbtouc_unsafe as 'extern', not
+   'static inline'.  */
+# include "unistring-notinline.h"
+#endif
+
+/* Specification.  */
+#include "unistr.h"
+
+#if !HAVE_INLINE
+
+int
+u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n)
+{
+  uint8_t c = *s;
+
+  if (c < 0x80)
+    {
+      *puc = c;
+      return 1;
+    }
+  else if (c >= 0xc2)
+    {
+      if (c < 0xe0)
+        {
+          if (n >= 2)
+            {
+              if ((s[1] ^ 0x80) < 0x40)
+                {
+                  *puc = ((unsigned int) (c & 0x1f) << 6)
+                         | (unsigned int) (s[1] ^ 0x80);
+                  return 2;
+                }
+              /* invalid multibyte character */
+            }
+          else
+            {
+              /* incomplete multibyte character */
+              *puc = 0xfffd;
+              return 1;
+            }
+        }
+      else if (c < 0xf0)
+        {
+          if (n >= 3)
+            {
+              if ((s[1] ^ 0x80) < 0x40)
+                {
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((c >= 0xe1 || s[1] >= 0xa0)
+                          && (c != 0xed || s[1] < 0xa0))
+                        {
+                          *puc = ((unsigned int) (c & 0x0f) << 12)
+                                 | ((unsigned int) (s[1] ^ 0x80) << 6)
+                                 | (unsigned int) (s[2] ^ 0x80);
+                          return 3;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  *puc = 0xfffd;
+                  return 2;
+                }
+              /* invalid multibyte character */
+            }
+          else
+            {
+              /* incomplete multibyte character */
+              *puc = 0xfffd;
+              if (n == 1 || (s[1] ^ 0x80) >= 0x40)
+                return 1;
+              else
+                return 2;
+            }
+        }
+      else if (c < 0xf8)
+        {
+          if (n >= 4)
+            {
+              if ((s[1] ^ 0x80) < 0x40)
+                {
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((s[3] ^ 0x80) < 0x40)
+                        {
+                          if ((c >= 0xf1 || s[1] >= 0x90)
+                              && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
+                             )
+                            {
+                              *puc = ((unsigned int) (c & 0x07) << 18)
+                                     | ((unsigned int) (s[1] ^ 0x80) << 12)
+                                     | ((unsigned int) (s[2] ^ 0x80) << 6)
+                                     | (unsigned int) (s[3] ^ 0x80);
+                              return 4;
+                            }
+                          /* invalid multibyte character */
+                          *puc = 0xfffd;
+                          return 4;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  *puc = 0xfffd;
+                  return 2;
+                }
+              /* invalid multibyte character */
+            }
+          else
+            {
+              /* incomplete multibyte character */
+              *puc = 0xfffd;
+              if (n == 1 || (s[1] ^ 0x80) >= 0x40)
+                return 1;
+              else if (n == 2 || (s[2] ^ 0x80) >= 0x40)
+                return 2;
+              else
+                return 3;
+            }
+        }
+    }
+  /* invalid multibyte character */
+  *puc = 0xfffd;
+  return 1;
+}
+
+#endif