mbsrtowcs-impl.h revision 1.1.1.2
1/* Convert string to wide string. 2 Copyright (C) 2008-2022 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2008. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file 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 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18size_t 19FUNC (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} 123