1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/queue.h> 30 31 #include <assert.h> 32 #include <errno.h> 33 #include <langinfo.h> 34 #include <limits.h> 35 #include <string.h> 36 #include <uchar.h> 37 38 #include "../iconv/citrus_hash.h" 39 #include "../iconv/citrus_module.h" 40 #include "../iconv/citrus_iconv.h" 41 #include "mblocal.h" 42 43 typedef struct { 44 bool initialized; 45 struct _citrus_iconv iconv; 46 char srcbuf[MB_LEN_MAX]; 47 size_t srcbuf_len; 48 union { 49 charXX_t widechar[DSTBUF_LEN]; 50 char bytes[sizeof(charXX_t) * DSTBUF_LEN]; 51 } dstbuf; 52 size_t dstbuf_len; 53 } _ConversionState; 54 _Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t), 55 "Size of _ConversionState must not exceed mbstate_t's size."); 56 57 size_t 58 mbrtocXX_l(charXX_t * __restrict pc, const char * __restrict s, size_t n, 59 mbstate_t * __restrict ps, locale_t locale) 60 { 61 _ConversionState *cs; 62 struct _citrus_iconv *handle; 63 size_t i, retval; 64 charXX_t retchar; 65 66 FIX_LOCALE(locale); 67 if (ps == NULL) 68 ps = &(XLOCALE_CTYPE(locale)->mbrtocXX); 69 cs = (_ConversionState *)ps; 70 handle = &cs->iconv; 71 72 /* Reinitialize mbstate_t. */ 73 if (s == NULL || !cs->initialized) { 74 if (_citrus_iconv_open(&handle, 75 nl_langinfo_l(CODESET, locale), UTF_XX_INTERNAL) != 0) { 76 cs->initialized = false; 77 errno = EINVAL; 78 return (-1); 79 } 80 cs->srcbuf_len = cs->dstbuf_len = 0; 81 cs->initialized = true; 82 if (s == NULL) 83 return (0); 84 } 85 86 /* See if we still have characters left from the previous invocation. */ 87 if (cs->dstbuf_len > 0) { 88 retval = (size_t)-3; 89 goto return_char; 90 } 91 92 /* Fill up the read buffer as far as possible. */ 93 if (n > sizeof(cs->srcbuf) - cs->srcbuf_len) 94 n = sizeof(cs->srcbuf) - cs->srcbuf_len; 95 memcpy(cs->srcbuf + cs->srcbuf_len, s, n); 96 97 /* Convert as few characters to the dst buffer as possible. */ 98 for (i = 0; ; i++) { 99 char *src, *dst; 100 size_t srcleft, dstleft, invlen; 101 int err; 102 103 src = cs->srcbuf; 104 srcleft = cs->srcbuf_len + n; 105 dst = cs->dstbuf.bytes; 106 dstleft = i * sizeof(charXX_t); 107 assert(srcleft <= sizeof(cs->srcbuf) && 108 dstleft <= sizeof(cs->dstbuf.bytes)); 109 err = _citrus_iconv_convert(handle, &src, &srcleft, 110 &dst, &dstleft, _CITRUS_ICONV_F_HIDE_INVALID, &invlen); 111 cs->dstbuf_len = (dst - cs->dstbuf.bytes) / sizeof(charXX_t); 112 113 /* Got new character(s). Return the first. */ 114 if (cs->dstbuf_len > 0) { 115 assert(src - cs->srcbuf > cs->srcbuf_len); 116 retval = src - cs->srcbuf - cs->srcbuf_len; 117 cs->srcbuf_len = 0; 118 goto return_char; 119 } 120 121 /* Increase dst buffer size, to obtain the surrogate pair. */ 122 if (err == E2BIG) 123 continue; 124 125 /* Illegal sequence. */ 126 if (invlen > 0) { 127 cs->srcbuf_len = 0; 128 errno = EILSEQ; 129 return ((size_t)-1); 130 } 131 132 /* Save unprocessed remainder for the next invocation. */ 133 memmove(cs->srcbuf, src, srcleft); 134 cs->srcbuf_len = srcleft; 135 return ((size_t)-2); 136 } 137 138 return_char: 139 retchar = cs->dstbuf.widechar[0]; 140 memmove(&cs->dstbuf.widechar[0], &cs->dstbuf.widechar[1], 141 --cs->dstbuf_len * sizeof(charXX_t)); 142 if (pc != NULL) 143 *pc = retchar; 144 if (retchar == 0) 145 return (0); 146 return (retval); 147 } 148 149 size_t 150 mbrtocXX(charXX_t * __restrict pc, const char * __restrict s, size_t n, 151 mbstate_t * __restrict ps) 152 { 153 154 return (mbrtocXX_l(pc, s, n, ps, __get_locale())); 155 } 156