summaryrefslogtreecommitdiff
path: root/lib/unistr/u-strspn.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/unistr/u-strspn.h')
-rw-r--r--lib/unistr/u-strspn.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/unistr/u-strspn.h b/lib/unistr/u-strspn.h
new file mode 100644
index 00000000..6502ce4b
--- /dev/null
+++ b/lib/unistr/u-strspn.h
@@ -0,0 +1,54 @@
+/* Search for some characters in UTF-8/UTF-16/UTF-32 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 Lesser 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
+ 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 <http://www.gnu.org/licenses/>. */
+
+size_t
+FUNC (const UNIT *str, const UNIT *accept)
+{
+ /* Optimize two cases. */
+ if (accept[0] == 0)
+ return 0;
+ {
+ ucs4_t uc;
+ int count = U_STRMBTOUC (&uc, accept);
+ if (count >= 0 && accept[count] == 0)
+ {
+ const UNIT *ptr = str;
+ for (; *ptr != 0; ptr += count)
+ if (U_CMP (ptr, accept, count) != 0)
+ break;
+ return ptr - str;
+ }
+ }
+ /* General case. */
+ {
+ const UNIT *ptr = str;
+
+ for (;;)
+ {
+ ucs4_t uc;
+ int count = U_STRMBTOUC (&uc, ptr);
+ if (count == 0)
+ return ptr - str;
+ if (count < 0)
+ break;
+ if (!U_STRCHR (accept, uc))
+ return ptr - str;
+ ptr += count;
+ }
+ return U_STRLEN (str);
+ }
+}