New modules 'unistr/u8-strchr', 'unistr/u16-strchr', 'unistr/u32-strchr'.

[gnulib.git] / lib / unistr / u16-strchr.c

diff --git a/lib/unistr/u16-strchr.c b/lib/unistr/u16-strchr.c
new file mode 100644 (file)
index 0000000..4b152ec
--- /dev/null
+++ b/lib/unistr/u16-strchr.c
@@ -0,0 +1,67 @@
+/* Search character in UTF-16 string.
+   Copyright (C) 1999, 2002, 2006 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 the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unistr.h"
+
+#include "ucs4-utf16.h"
+
+uint16_t *
+u16_strchr (const uint16_t *s, ucs4_t uc)
+{
+  uint16_t c[2];
+
+  if (uc < 0x10000)
+    {
+      uint16_t c0 = uc;
+
+      for (;; s++)
+       {
+         if (*s == c0)
+           break;
+         if (*s == 0)
+           goto notfound;
+       }
+      return (uint16_t *) s;
+    }
+  else
+    switch (u16_uctomb_aux (c, uc, 2))
+      {
+      case 2:
+       if (*s == 0)
+         goto notfound;
+       {
+         uint16_t c0 = c[0];
+         uint16_t c1 = c[1];
+
+         for (;; s++)
+           {
+             if (s[1] == 0)
+               goto notfound;
+             if (*s == c0 && s[1] == c1)
+               break;
+           }
+         return (uint16_t *) s;
+       }
+      }
+notfound:
+  return NULL;
+}