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-rw-r--r--lib/mbrtowc-impl-utf8.h138
1 files changed, 138 insertions, 0 deletions
diff --git a/lib/mbrtowc-impl-utf8.h b/lib/mbrtowc-impl-utf8.h
new file mode 100644
index 0000000..8e5ac14
--- /dev/null
+++ b/lib/mbrtowc-impl-utf8.h
@@ -0,0 +1,138 @@
+/* Convert multibyte character to wide character.
+ Copyright (C) 1999-2002, 2005-2022 Free Software Foundation, Inc.
+
+ This file 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 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
+
+/* This file contains the part of the body of the mbrtowc and mbrtoc32 functions
+ that handles the special case of the UTF-8 encoding. */
+
+ /* Cf. unistr/u8-mbtouc.c. */
+ unsigned char c = (unsigned char) p[0];
+
+ if (c < 0x80)
+ {
+ if (pwc != NULL)
+ *pwc = c;
+ res = (c == 0 ? 0 : 1);
+ goto success;
+ }
+ if (c >= 0xc2)
+ {
+ if (c < 0xe0)
+ {
+ if (m == 1)
+ goto incomplete;
+ else /* m >= 2 */
+ {
+ unsigned char c2 = (unsigned char) p[1];
+
+ if ((c2 ^ 0x80) < 0x40)
+ {
+ if (pwc != NULL)
+ *pwc = ((unsigned int) (c & 0x1f) << 6)
+ | (unsigned int) (c2 ^ 0x80);
+ res = 2;
+ goto success;
+ }
+ }
+ }
+ else if (c < 0xf0)
+ {
+ if (m == 1)
+ goto incomplete;
+ else
+ {
+ unsigned char c2 = (unsigned char) p[1];
+
+ if ((c2 ^ 0x80) < 0x40
+ && (c >= 0xe1 || c2 >= 0xa0)
+ && (c != 0xed || c2 < 0xa0))
+ {
+ if (m == 2)
+ goto incomplete;
+ else /* m >= 3 */
+ {
+ unsigned char c3 = (unsigned char) p[2];
+
+ if ((c3 ^ 0x80) < 0x40)
+ {
+ unsigned int wc =
+ (((unsigned int) (c & 0x0f) << 12)
+ | ((unsigned int) (c2 ^ 0x80) << 6)
+ | (unsigned int) (c3 ^ 0x80));
+
+ if (FITS_IN_CHAR_TYPE (wc))
+ {
+ if (pwc != NULL)
+ *pwc = wc;
+ res = 3;
+ goto success;
+ }
+ }
+ }
+ }
+ }
+ }
+ else if (c <= 0xf4)
+ {
+ if (m == 1)
+ goto incomplete;
+ else
+ {
+ unsigned char c2 = (unsigned char) p[1];
+
+ if ((c2 ^ 0x80) < 0x40
+ && (c >= 0xf1 || c2 >= 0x90)
+ && (c < 0xf4 || (/* c == 0xf4 && */ c2 < 0x90)))
+ {
+ if (m == 2)
+ goto incomplete;
+ else
+ {
+ unsigned char c3 = (unsigned char) p[2];
+
+ if ((c3 ^ 0x80) < 0x40)
+ {
+ if (m == 3)
+ goto incomplete;
+ else /* m >= 4 */
+ {
+ unsigned char c4 = (unsigned char) p[3];
+
+ if ((c4 ^ 0x80) < 0x40)
+ {
+ unsigned int wc =
+ (((unsigned int) (c & 0x07) << 18)
+ | ((unsigned int) (c2 ^ 0x80) << 12)
+ | ((unsigned int) (c3 ^ 0x80) << 6)
+ | (unsigned int) (c4 ^ 0x80));
+
+ if (FITS_IN_CHAR_TYPE (wc))
+ {
+ if (pwc != NULL)
+ *pwc = wc;
+ res = 4;
+ goto success;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ goto invalid;