1 /* Copyright (c) 2019 Adrian Lopez 2 3 This software is provided 'as-is', without any express or implied 4 warranty. In no event will the authors be held liable for any damages 5 arising from the use of this software. 6 7 Permission is granted to anyone to use this software for any purpose, 8 including commercial applications, and to alter it and redistribute it 9 freely, subject to the following restrictions: 10 11 1. The origin of this software must not be misrepresented; you must not 12 claim that you wrote the original software. If you use this software 13 in a product, an acknowledgment in the product documentation would be 14 appreciated but is not required. 15 2. Altered source versions must be plainly marked as such, and must not be 16 misrepresented as being the original software. 17 3. This notice may not be removed or altered from any source distribution. */ 18 19 #include "config.h" 20 #include "mbstowcs_escape_invalid.h" 21 #include <wchar.h> 22 #include <string.h> 23 #include <stdio.h> 24 25 void reset_mbstate(mbstate_t *state) 26 { 27 memset(state, 0, sizeof(mbstate_t)); 28 } 29 30 size_t putoctal(wchar_t *dest, char c) 31 { 32 swprintf(dest, 5, L"\\%03o", (unsigned char) c); 33 return 4; 34 } 35 36 size_t put_invalid_sequence(wchar_t *dest, const char *src, size_t *destination_index, size_t count, size_t max) 37 { 38 size_t x; 39 40 for (x = 0; x < count; ++x) 41 { 42 if (dest != 0) 43 { 44 if (*destination_index + 5 > max) 45 return x; 46 47 putoctal(dest + *destination_index, src[x]); 48 } 49 50 *destination_index += 4; 51 } 52 53 return count; 54 } 55 56 size_t mbstowcs_escape_invalid(wchar_t *dest, const char *src, size_t n) 57 { 58 mbstate_t state; 59 wchar_t wc; 60 size_t x; 61 size_t i; 62 size_t dx; 63 size_t write; 64 size_t written; 65 size_t result; 66 67 reset_mbstate(&state); 68 69 x = 0; 70 i = 0; 71 dx = 0; 72 73 while (src[x] != '\0') 74 { 75 result = mbrtowc(&wc, src + x, 1, &state); 76 77 if (result == -2) 78 /* sequence is not yet complete */ 79 { 80 ++x; 81 ++i; 82 } 83 else if (result == -1) 84 /* invalid sequence */ 85 { 86 write = i == 0 ? 1 : i; 87 88 if (dest != 0) 89 { 90 written = put_invalid_sequence(dest, src + (x - i), &dx, write, n); 91 92 if (written != write) 93 return -1; 94 } 95 else 96 put_invalid_sequence(0, src + (x - i), &dx, write, 0); 97 98 if (i == 0) 99 ++x; 100 101 i = 0; 102 103 reset_mbstate(&state); 104 } 105 else if (result != 0) 106 /* OK, add character */ 107 { 108 if (dest != 0) 109 { 110 if (dx < n) 111 dest[dx++] = wc; 112 else 113 return -1; 114 } 115 else 116 ++dx; 117 118 ++x; 119 120 i = 0; 121 } 122 123 if (src[x] == L'\0' && i > 0) 124 /* output final incomplete sequence */ 125 { 126 if (dest != 0) 127 { 128 written = put_invalid_sequence(dest, src + (x - i), &dx, i, n); 129 130 if (written != i) 131 return -1; 132 } 133 else 134 put_invalid_sequence(0, src + (x - i), &dx, i, 0); 135 } 136 } 137 138 if (dest != 0) 139 { 140 if (dx < n) 141 dest[dx] = L'\0'; 142 else 143 return -1; 144 } 145 CTL_CODE( DeviceType: DWORD, Function: DWORD, Method: DWORD, Access: DWORD, ) -> DWORD146 return dx + 1; 147 } 148