| 1 | /* Convert string to wide string. |
| 2 | Copyright (C) 2008-2021 Free Software Foundation, Inc. |
| 3 | Written by Bruno Haible <bruno@clisp.org>, 2008. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | size_t |
| 19 | FUNC (DCHAR_T *dest, const char **srcp, size_t len, mbstate_t *ps) |
| 20 | { |
| 21 | if (ps == NULL) |
| 22 | ps = &INTERNAL_STATE; |
| 23 | { |
| 24 | const char *src = *srcp; |
| 25 | |
| 26 | if (dest != NULL) |
| 27 | { |
| 28 | DCHAR_T *destptr = dest; |
| 29 | |
| 30 | for (; len > 0; destptr++, len--) |
| 31 | { |
| 32 | size_t src_avail; |
| 33 | size_t ret; |
| 34 | |
| 35 | /* An optimized variant of |
| 36 | src_avail = strnlen1 (src, MB_LEN_MAX); */ |
| 37 | if (src[0] == '\0') |
| 38 | src_avail = 1; |
| 39 | else if (src[1] == '\0') |
| 40 | src_avail = 2; |
| 41 | else if (src[2] == '\0') |
| 42 | src_avail = 3; |
| 43 | else if (MB_LEN_MAX <= 4 || src[3] == '\0') |
| 44 | src_avail = 4; |
| 45 | else |
| 46 | src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4); |
| 47 | |
| 48 | /* Parse the next multibyte character. */ |
| 49 | ret = MBRTOWC (destptr, src, src_avail, ps); |
| 50 | |
| 51 | if (ret == (size_t)(-2)) |
| 52 | /* Encountered a multibyte character that extends past a '\0' byte |
| 53 | or that is longer than MB_LEN_MAX bytes. Cannot happen. */ |
| 54 | abort (); |
| 55 | |
| 56 | if (ret == (size_t)(-1)) |
| 57 | goto bad_input; |
| 58 | if (ret == 0) |
| 59 | { |
| 60 | src = NULL; |
| 61 | /* Here mbsinit (ps). */ |
| 62 | break; |
| 63 | } |
| 64 | src += ret; |
| 65 | } |
| 66 | |
| 67 | *srcp = src; |
| 68 | return destptr - dest; |
| 69 | } |
| 70 | else |
| 71 | { |
| 72 | /* Ignore dest and len, don't store *srcp at the end, and |
| 73 | don't clobber *ps. */ |
| 74 | mbstate_t state = *ps; |
| 75 | size_t totalcount = 0; |
| 76 | |
| 77 | for (;; totalcount++) |
| 78 | { |
| 79 | size_t src_avail; |
| 80 | size_t ret; |
| 81 | |
| 82 | /* An optimized variant of |
| 83 | src_avail = strnlen1 (src, MB_LEN_MAX); */ |
| 84 | if (src[0] == '\0') |
| 85 | src_avail = 1; |
| 86 | else if (src[1] == '\0') |
| 87 | src_avail = 2; |
| 88 | else if (src[2] == '\0') |
| 89 | src_avail = 3; |
| 90 | else if (MB_LEN_MAX <= 4 || src[3] == '\0') |
| 91 | src_avail = 4; |
| 92 | else |
| 93 | src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4); |
| 94 | |
| 95 | /* Parse the next multibyte character. */ |
| 96 | ret = MBRTOWC (NULL, src, src_avail, &state); |
| 97 | |
| 98 | if (ret == (size_t)(-2)) |
| 99 | /* Encountered a multibyte character that extends past a '\0' byte |
| 100 | or that is longer than MB_LEN_MAX bytes. Cannot happen. */ |
| 101 | abort (); |
| 102 | |
| 103 | if (ret == (size_t)(-1)) |
| 104 | goto bad_input2; |
| 105 | if (ret == 0) |
| 106 | { |
| 107 | /* Here mbsinit (&state). */ |
| 108 | break; |
| 109 | } |
| 110 | src += ret; |
| 111 | } |
| 112 | |
| 113 | return totalcount; |
| 114 | } |
| 115 | |
| 116 | bad_input: |
| 117 | *srcp = src; |
| 118 | bad_input2: |
| 119 | errno = EILSEQ; |
| 120 | return (size_t)(-1); |
| 121 | } |
| 122 | } |