lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2011-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library 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 GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <assert.h> |
| 20 | #include <dlfcn.h> |
| 21 | #include <errno.h> |
| 22 | #include <gconv.h> |
| 23 | #include <uchar.h> |
| 24 | #include <wcsmbsload.h> |
| 25 | |
| 26 | #include <sysdep.h> |
| 27 | |
| 28 | #ifndef EILSEQ |
| 29 | # define EILSEQ EINVAL |
| 30 | #endif |
| 31 | |
| 32 | |
| 33 | /* This is the private state used if PS is NULL. */ |
| 34 | static mbstate_t state; |
| 35 | |
| 36 | size_t |
| 37 | mbrtoc16 (char16_t *pc16, const char *s, size_t n, mbstate_t *ps) |
| 38 | { |
| 39 | if (ps == NULL) |
| 40 | ps = &state; |
| 41 | |
| 42 | /* The standard text does not say that S being NULL means the state |
| 43 | is reset even if the second half of a surrogate still have to be |
| 44 | returned. In fact, the error code description indicates |
| 45 | otherwise. Therefore always first try to return a second |
| 46 | half. */ |
| 47 | if (ps->__count & 0x80000000) |
| 48 | { |
| 49 | /* We have to return the second word for a surrogate. */ |
| 50 | ps->__count &= 0x7fffffff; |
| 51 | *pc16 = ps->__value.__wch; |
| 52 | ps->__value.__wch = L'\0'; |
| 53 | return (size_t) -3; |
| 54 | } |
| 55 | |
| 56 | wchar_t wc; |
| 57 | struct __gconv_step_data data; |
| 58 | int status; |
| 59 | size_t result; |
| 60 | size_t dummy; |
| 61 | const unsigned char *inbuf, *endbuf; |
| 62 | unsigned char *outbuf = (unsigned char *) &wc; |
| 63 | const struct gconv_fcts *fcts; |
| 64 | |
| 65 | /* Set information for this step. */ |
| 66 | data.__invocation_counter = 0; |
| 67 | data.__internal_use = 1; |
| 68 | data.__flags = __GCONV_IS_LAST; |
| 69 | data.__statep = ps; |
| 70 | |
| 71 | /* A first special case is if S is NULL. This means put PS in the |
| 72 | initial state. */ |
| 73 | if (s == NULL) |
| 74 | { |
| 75 | pc16 = NULL; |
| 76 | s = ""; |
| 77 | n = 1; |
| 78 | } |
| 79 | |
| 80 | if (n == 0) |
| 81 | return (size_t) -2; |
| 82 | |
| 83 | /* Tell where we want the result. */ |
| 84 | data.__outbuf = outbuf; |
| 85 | data.__outbufend = outbuf + sizeof (wchar_t); |
| 86 | |
| 87 | /* Get the conversion functions. */ |
| 88 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
| 89 | |
| 90 | /* Do a normal conversion. */ |
| 91 | inbuf = (const unsigned char *) s; |
| 92 | endbuf = inbuf + n; |
| 93 | if (__glibc_unlikely (endbuf < inbuf)) |
| 94 | { |
| 95 | endbuf = (const unsigned char *) ~(uintptr_t) 0; |
| 96 | if (endbuf == inbuf) |
| 97 | goto ilseq; |
| 98 | } |
| 99 | __gconv_fct fct = fcts->towc->__fct; |
| 100 | #ifdef PTR_DEMANGLE |
| 101 | if (fcts->towc->__shlib_handle != NULL) |
| 102 | PTR_DEMANGLE (fct); |
| 103 | #endif |
| 104 | |
| 105 | status = DL_CALL_FCT (fct, (fcts->towc, &data, &inbuf, endbuf, |
| 106 | NULL, &dummy, 0, 1)); |
| 107 | |
| 108 | /* There must not be any problems with the conversion but illegal input |
| 109 | characters. The output buffer must be large enough, otherwise the |
| 110 | definition of MB_CUR_MAX is not correct. All the other possible |
| 111 | errors also must not happen. */ |
| 112 | assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT |
| 113 | || status == __GCONV_ILLEGAL_INPUT |
| 114 | || status == __GCONV_INCOMPLETE_INPUT |
| 115 | || status == __GCONV_FULL_OUTPUT); |
| 116 | |
| 117 | if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT |
| 118 | || status == __GCONV_FULL_OUTPUT) |
| 119 | { |
| 120 | result = inbuf - (const unsigned char *) s; |
| 121 | |
| 122 | if (wc < 0x10000) |
| 123 | { |
| 124 | if (pc16 != NULL) |
| 125 | *pc16 = wc; |
| 126 | |
| 127 | if (data.__outbuf != outbuf && wc == L'\0') |
| 128 | { |
| 129 | /* The converted character is the NUL character. */ |
| 130 | assert (__mbsinit (data.__statep)); |
| 131 | result = 0; |
| 132 | } |
| 133 | } |
| 134 | else |
| 135 | { |
| 136 | /* This is a surrogate. */ |
| 137 | if (pc16 != NULL) |
| 138 | *pc16 = 0xd7c0 + (wc >> 10); |
| 139 | |
| 140 | ps->__count |= 0x80000000; |
| 141 | ps->__value.__wch = 0xdc00 + (wc & 0x3ff); |
| 142 | } |
| 143 | } |
| 144 | else if (status == __GCONV_INCOMPLETE_INPUT) |
| 145 | result = (size_t) -2; |
| 146 | else |
| 147 | { |
| 148 | ilseq: |
| 149 | result = (size_t) -1; |
| 150 | __set_errno (EILSEQ); |
| 151 | } |
| 152 | |
| 153 | return result; |
| 154 | } |