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| 1 /* Convert string to wide string. |
| 2 Copyright (C) 2008-2012 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 <http://www.gnu.org/licenses/>. */ |
| 17 |
| 18 size_t |
| 19 mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps) |
| 20 { |
| 21 if (ps == NULL) |
| 22 ps = &_gl_mbsrtowcs_state; |
| 23 { |
| 24 const char *src = *srcp; |
| 25 |
| 26 if (dest != NULL) |
| 27 { |
| 28 wchar_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 } |
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