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-rw-r--r--lib/unistr/u8-mbtouc-unsafe.c150
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
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+++ b/lib/unistr/u8-mbtouc-unsafe.c
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+/* 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