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-rw-r--r--lib/mbsrtowcs-impl.h122
1 files changed, 122 insertions, 0 deletions
diff --git a/lib/mbsrtowcs-impl.h b/lib/mbsrtowcs-impl.h
new file mode 100644
index 0000000..06ecec2
--- /dev/null
+++ b/lib/mbsrtowcs-impl.h
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+/* Convert string to wide string.
+ Copyright (C) 2008-2020 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2008.
+
+ 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/>. */
+
+size_t
+FUNC (DCHAR_T *dest, const char **srcp, size_t len, mbstate_t *ps)
+{
+ if (ps == NULL)
+ ps = &INTERNAL_STATE;
+ {
+ const char *src = *srcp;
+
+ if (dest != NULL)
+ {
+ DCHAR_T *destptr = dest;
+
+ for (; len > 0; destptr++, len--)
+ {
+ size_t src_avail;
+ size_t ret;
+
+ /* An optimized variant of
+ src_avail = strnlen1 (src, MB_LEN_MAX); */
+ if (src[0] == '\0')
+ src_avail = 1;
+ else if (src[1] == '\0')
+ src_avail = 2;
+ else if (src[2] == '\0')
+ src_avail = 3;
+ else if (MB_LEN_MAX <= 4 || src[3] == '\0')
+ src_avail = 4;
+ else
+ src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);
+
+ /* Parse the next multibyte character. */
+ ret = MBRTOWC (destptr, src, src_avail, ps);
+
+ if (ret == (size_t)(-2))
+ /* Encountered a multibyte character that extends past a '\0' byte
+ or that is longer than MB_LEN_MAX bytes. Cannot happen. */
+ abort ();
+
+ if (ret == (size_t)(-1))
+ goto bad_input;
+ if (ret == 0)
+ {
+ src = NULL;
+ /* Here mbsinit (ps). */
+ break;
+ }
+ src += ret;
+ }
+
+ *srcp = src;
+ return destptr - dest;
+ }
+ else
+ {
+ /* Ignore dest and len, don't store *srcp at the end, and
+ don't clobber *ps. */
+ mbstate_t state = *ps;
+ size_t totalcount = 0;
+
+ for (;; totalcount++)
+ {
+ size_t src_avail;
+ size_t ret;
+
+ /* An optimized variant of
+ src_avail = strnlen1 (src, MB_LEN_MAX); */
+ if (src[0] == '\0')
+ src_avail = 1;
+ else if (src[1] == '\0')
+ src_avail = 2;
+ else if (src[2] == '\0')
+ src_avail = 3;
+ else if (MB_LEN_MAX <= 4 || src[3] == '\0')
+ src_avail = 4;
+ else
+ src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);
+
+ /* Parse the next multibyte character. */
+ ret = MBRTOWC (NULL, src, src_avail, &state);
+
+ if (ret == (size_t)(-2))
+ /* Encountered a multibyte character that extends past a '\0' byte
+ or that is longer than MB_LEN_MAX bytes. Cannot happen. */
+ abort ();
+
+ if (ret == (size_t)(-1))
+ goto bad_input2;
+ if (ret == 0)
+ {
+ /* Here mbsinit (&state). */
+ break;
+ }
+ src += ret;
+ }
+
+ return totalcount;
+ }
+
+ bad_input:
+ *srcp = src;
+ bad_input2:
+ errno = EILSEQ;
+ return (size_t)(-1);
+ }
+}