| /* Convert string to wide string. |
| Copyright (C) 2008-2013 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 <http://www.gnu.org/licenses/>. */ |
| |
| size_t |
| mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps) |
| { |
| if (ps == NULL) |
| ps = &_gl_mbsrtowcs_state; |
| { |
| const char *src = *srcp; |
| |
| if (dest != NULL) |
| { |
| wchar_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); |
| } |
| } |