projects / mirror_edk2.git / blame
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| c058d59f JY |
1 | /** @file\r |
| 2 | Safe String functions.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
| 5 | This program and the accompanying materials\r | |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | http://opensource.org/licenses/bsd-license.php.\r | |
| 9 | \r | |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | \r | |
| 13 | **/\r | |
| 14 | \r | |
| 15 | #include <Base.h>\r | |
| 16 | #include <Library/DebugLib.h>\r | |
| 17 | #include <Library/PcdLib.h>\r | |
| 18 | #include <Library/BaseLib.h>\r | |
| 19 | \r | |
| 20 | #define RSIZE_MAX (PcdGet32 (PcdMaximumUnicodeStringLength))\r | |
| 21 | \r | |
| 22 | #define ASCII_RSIZE_MAX (PcdGet32 (PcdMaximumAsciiStringLength))\r | |
| 23 | \r | |
| 24 | #define SAFE_STRING_CONSTRAINT_CHECK(Expression, Status) \\r | |
| 25 | do { \\r | |
| 26 | ASSERT (Expression); \\r | |
| 27 | if (!(Expression)) { \\r | |
| 28 | return Status; \\r | |
| 29 | } \\r | |
| 30 | } while (FALSE)\r | |
| 31 | \r | |
| 32 | /**\r | |
| 33 | Returns if 2 memory blocks are overlapped.\r | |
| 34 | \r | |
| 35 | @param Base1 Base address of 1st memory block.\r | |
| 36 | @param Size1 Size of 1st memory block.\r | |
| 37 | @param Base2 Base address of 2nd memory block.\r | |
| 38 | @param Size2 Size of 2nd memory block.\r | |
| 39 | \r | |
| 40 | @retval TRUE 2 memory blocks are overlapped.\r | |
| 41 | @retval FALSE 2 memory blocks are not overlapped.\r | |
| 42 | **/\r | |
| 43 | BOOLEAN\r | |
| 44 | InternalSafeStringIsOverlap (\r | |
| 45 | IN VOID *Base1,\r | |
| 46 | IN UINTN Size1,\r | |
| 47 | IN VOID *Base2,\r | |
| 48 | IN UINTN Size2\r | |
| 49 | )\r | |
| 50 | {\r | |
| 51 | if ((((UINTN)Base1 >= (UINTN)Base2) && ((UINTN)Base1 < (UINTN)Base2 + Size2)) ||\r | |
| 52 | (((UINTN)Base2 >= (UINTN)Base1) && ((UINTN)Base2 < (UINTN)Base1 + Size1))) {\r | |
| 53 | return TRUE;\r | |
| 54 | }\r | |
| 55 | return FALSE;\r | |
| 56 | }\r | |
| 57 | \r | |
| 58 | /**\r | |
| 59 | Returns if 2 Unicode strings are not overlapped.\r | |
| 60 | \r | |
| 61 | @param Str1 Start address of 1st Unicode string.\r | |
| 62 | @param Size1 The number of char in 1st Unicode string,\r | |
| 63 | including terminating null char.\r | |
| 64 | @param Str2 Start address of 2nd Unicode string.\r | |
| 65 | @param Size2 The number of char in 2nd Unicode string,\r | |
| 66 | including terminating null char.\r | |
| 67 | \r | |
| 68 | @retval TRUE 2 Unicode strings are NOT overlapped.\r | |
| 69 | @retval FALSE 2 Unicode strings are overlapped.\r | |
| 70 | **/\r | |
| 71 | BOOLEAN\r | |
| 72 | InternalSafeStringNoStrOverlap (\r | |
| 73 | IN CHAR16 *Str1,\r | |
| 74 | IN UINTN Size1,\r | |
| 75 | IN CHAR16 *Str2,\r | |
| 76 | IN UINTN Size2\r | |
| 77 | )\r | |
| 78 | {\r | |
| 79 | return !InternalSafeStringIsOverlap (Str1, Size1 * sizeof(CHAR16), Str2, Size2 * sizeof(CHAR16));\r | |
| 80 | }\r | |
| 81 | \r | |
| 82 | /**\r | |
| 83 | Returns if 2 Ascii strings are not overlapped.\r | |
| 84 | \r | |
| 85 | @param Str1 Start address of 1st Ascii string.\r | |
| 86 | @param Size1 The number of char in 1st Ascii string,\r | |
| 87 | including terminating null char.\r | |
| 88 | @param Str2 Start address of 2nd Ascii string.\r | |
| 89 | @param Size2 The number of char in 2nd Ascii string,\r | |
| 90 | including terminating null char.\r | |
| 91 | \r | |
| 92 | @retval TRUE 2 Ascii strings are NOT overlapped.\r | |
| 93 | @retval FALSE 2 Ascii strings are overlapped.\r | |
| 94 | **/\r | |
| 95 | BOOLEAN\r | |
| 96 | InternalSafeStringNoAsciiStrOverlap (\r | |
| 97 | IN CHAR8 *Str1,\r | |
| 98 | IN UINTN Size1,\r | |
| 99 | IN CHAR8 *Str2,\r | |
| 100 | IN UINTN Size2\r | |
| 101 | )\r | |
| 102 | {\r | |
| 103 | return !InternalSafeStringIsOverlap (Str1, Size1, Str2, Size2);\r | |
| 104 | }\r | |
| 105 | \r | |
| 106 | /**\r | |
| 107 | Returns the length of a Null-terminated Unicode string.\r | |
| 108 | \r | |
| 109 | If String is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 110 | \r | |
| 111 | @param String A pointer to a Null-terminated Unicode string.\r | |
| 112 | @param MaxSize The maximum number of Destination Unicode\r | |
| 113 | char, including terminating null char.\r | |
| 114 | \r | |
| 115 | @retval 0 If String is NULL.\r | |
| 116 | @retval MaxSize If there is no null character in the first MaxSize characters of String.\r | |
| 117 | @return The number of characters that percede the terminating null character.\r | |
| 118 | \r | |
| 119 | **/\r | |
| 120 | UINTN\r | |
| 121 | EFIAPI\r | |
| 122 | StrnLenS (\r | |
| 123 | IN CONST CHAR16 *String,\r | |
| 124 | IN UINTN MaxSize\r | |
| 125 | )\r | |
| 126 | {\r | |
| 127 | UINTN Length;\r | |
| 128 | \r | |
| 129 | ASSERT (((UINTN) String & BIT0) == 0);\r | |
| 130 | \r | |
| 131 | //\r | |
| 132 | // If String is a null pointer, then the StrnLenS function returns zero.\r | |
| 133 | //\r | |
| 134 | if (String == NULL) {\r | |
| 135 | return 0;\r | |
| 136 | }\r | |
| 137 | \r | |
| 138 | //\r | |
| 139 | // Otherwise, the StrnLenS function returns the number of characters that precede the\r | |
| 140 | // terminating null character. If there is no null character in the first MaxSize characters of\r | |
| 141 | // String then StrnLenS returns MaxSize. At most the first MaxSize characters of String shall\r | |
| 142 | // be accessed by StrnLenS.\r | |
| 143 | //\r | |
| 144 | for (Length = 0; (*String != 0) && (Length < MaxSize); String++, Length++) {\r | |
| 145 | ;\r | |
| 146 | }\r | |
| 147 | return Length;\r | |
| 148 | }\r | |
| 149 | \r | |
| 150 | /**\r | |
| 151 | Copies the string pointed to by Source (including the terminating null char)\r | |
| 152 | to the array pointed to by Destination.\r | |
| 153 | \r | |
| 154 | If Destination is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 155 | If Source is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 156 | \r | |
| 157 | @param Destination A pointer to a Null-terminated Unicode string.\r | |
| 158 | @param DestMax The maximum number of Destination Unicode\r | |
| 159 | char, including terminating null char.\r | |
| 160 | @param Source A pointer to a Null-terminated Unicode string.\r | |
| 161 | \r | |
| 162 | @retval RETURN_SUCCESS String is copied.\r | |
| 163 | @retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).\r | |
| 164 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 165 | If Source is NULL.\r | |
| 166 | If PcdMaximumUnicodeStringLength is not zero,\r | |
| 167 | and DestMax is greater than \r | |
| 168 | PcdMaximumUnicodeStringLength.\r | |
| 169 | If DestMax is 0.\r | |
| 170 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 171 | **/\r | |
| 172 | RETURN_STATUS\r | |
| 173 | EFIAPI\r | |
| 174 | StrCpyS (\r | |
| 175 | OUT CHAR16 *Destination,\r | |
| 176 | IN UINTN DestMax,\r | |
| 177 | IN CONST CHAR16 *Source\r | |
| 178 | )\r | |
| 179 | {\r | |
| 180 | UINTN SourceLen;\r | |
| 181 | \r | |
| 182 | ASSERT (((UINTN) Destination & BIT0) == 0);\r | |
| 183 | ASSERT (((UINTN) Source & BIT0) == 0);\r | |
| 184 | \r | |
| 185 | //\r | |
| 186 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 187 | //\r | |
| 188 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 189 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 190 | \r | |
| 191 | //\r | |
| 192 | // 2. DestMax shall not be greater than RSIZE_MAX.\r | |
| 193 | //\r | |
| 194 | if (RSIZE_MAX != 0) {\r | |
| 195 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 196 | }\r | |
| 197 | \r | |
| 198 | //\r | |
| 199 | // 3. DestMax shall not equal zero.\r | |
| 200 | //\r | |
| 201 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 202 | \r | |
| 203 | //\r | |
| 204 | // 4. DestMax shall be greater than StrnLenS(Source, DestMax).\r | |
| 205 | //\r | |
| 206 | SourceLen = StrnLenS (Source, DestMax);\r | |
| 207 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 208 | \r | |
| 209 | //\r | |
| 210 | // 5. Copying shall not take place between objects that overlap.\r | |
| 211 | //\r | |
| 212 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoStrOverlap (Destination, DestMax, (CHAR16 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 213 | \r | |
| 214 | //\r | |
| 215 | // The StrCpyS function copies the string pointed to by Source (including the terminating\r | |
| 216 | // null character) into the array pointed to by Destination.\r | |
| 217 | //\r | |
| 218 | while (*Source != 0) {\r | |
| 219 | *(Destination++) = *(Source++);\r | |
| 220 | }\r | |
| 221 | *Destination = 0;\r | |
| 222 | \r | |
| 223 | return RETURN_SUCCESS;\r | |
| 224 | }\r | |
| 225 | \r | |
| 226 | /**\r | |
| 227 | Copies not more than Length successive char from the string pointed to by\r | |
| 228 | Source to the array pointed to by Destination. If no null char is copied from\r | |
| 229 | Source, then Destination[Length] is always set to null.\r | |
| 230 | \r | |
| 231 | If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 232 | If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 233 | \r | |
| 234 | @param Destination A pointer to a Null-terminated Unicode string.\r | |
| 235 | @param DestMax The maximum number of Destination Unicode\r | |
| 236 | char, including terminating null char.\r | |
| 237 | @param Source A pointer to a Null-terminated Unicode string.\r | |
| 238 | @param Length The maximum number of Unicode characters to copy.\r | |
| 239 | \r | |
| 240 | @retval RETURN_SUCCESS String is copied.\r | |
| 241 | @retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than \r | |
| 242 | MIN(StrLen(Source), Length).\r | |
| 243 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 244 | If Source is NULL.\r | |
| 245 | If PcdMaximumUnicodeStringLength is not zero,\r | |
| 246 | and DestMax is greater than \r | |
| 247 | PcdMaximumUnicodeStringLength.\r | |
| 248 | If DestMax is 0.\r | |
| 249 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 250 | **/\r | |
| 251 | RETURN_STATUS\r | |
| 252 | EFIAPI\r | |
| 253 | StrnCpyS (\r | |
| 254 | OUT CHAR16 *Destination,\r | |
| 255 | IN UINTN DestMax,\r | |
| 256 | IN CONST CHAR16 *Source,\r | |
| 257 | IN UINTN Length\r | |
| 258 | )\r | |
| 259 | {\r | |
| 260 | UINTN SourceLen;\r | |
| 261 | \r | |
| 262 | ASSERT (((UINTN) Destination & BIT0) == 0);\r | |
| 263 | ASSERT (((UINTN) Source & BIT0) == 0);\r | |
| 264 | \r | |
| 265 | //\r | |
| 266 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 267 | //\r | |
| 268 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 269 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 270 | \r | |
| 271 | //\r | |
| 272 | // 2. Neither DestMax nor Length shall be greater than RSIZE_MAX\r | |
| 273 | //\r | |
| 274 | if (RSIZE_MAX != 0) {\r | |
| 275 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 276 | SAFE_STRING_CONSTRAINT_CHECK ((Length <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 277 | }\r | |
| 278 | \r | |
| 279 | //\r | |
| 280 | // 3. DestMax shall not equal zero.\r | |
| 281 | //\r | |
| 282 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 283 | \r | |
| 284 | //\r | |
| 285 | // 4. If Length is not less than DestMax, then DestMax shall be greater than StrnLenS(Source, DestMax).\r | |
| 286 | //\r | |
| 287 | SourceLen = StrnLenS (Source, DestMax);\r | |
| 288 | if (Length >= DestMax) {\r | |
| 289 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 290 | }\r | |
| 291 | \r | |
| 292 | //\r | |
| 293 | // 5. Copying shall not take place between objects that overlap.\r | |
| 294 | //\r | |
| 295 | if (SourceLen > Length) {\r | |
| 296 | SourceLen = Length;\r | |
| 297 | }\r | |
| 298 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoStrOverlap (Destination, DestMax, (CHAR16 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 299 | \r | |
| 300 | //\r | |
| 301 | // The StrnCpyS function copies not more than Length successive characters (characters that\r | |
| 302 | // follow a null character are not copied) from the array pointed to by Source to the array\r | |
| 303 | // pointed to by Destination. If no null character was copied from Source, then Destination[Length] is set to a null\r | |
| 304 | // character.\r | |
| 305 | //\r | |
| 306 | while ((*Source != 0) && (SourceLen > 0)) {\r | |
| 307 | *(Destination++) = *(Source++);\r | |
| 308 | SourceLen--;\r | |
| 309 | }\r | |
| 310 | *Destination = 0;\r | |
| 311 | \r | |
| 312 | return RETURN_SUCCESS;\r | |
| 313 | }\r | |
| 314 | \r | |
| 315 | /**\r | |
| 316 | Appends a copy of the string pointed to by Source (including the terminating\r | |
| 317 | null char) to the end of the string pointed to by Destination.\r | |
| 318 | \r | |
| 319 | If Destination is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 320 | If Source is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 321 | \r | |
| 322 | @param Destination A pointer to a Null-terminated Unicode string.\r | |
| 323 | @param DestMax The maximum number of Destination Unicode\r | |
| 324 | char, including terminating null char.\r | |
| 325 | @param Source A pointer to a Null-terminated Unicode string.\r | |
| 326 | \r | |
| 327 | @retval RETURN_SUCCESS String is appended.\r | |
| 328 | @retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than \r | |
| 329 | StrLen(Destination).\r | |
| 330 | @retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT\r | |
| 331 | greater than StrLen(Source).\r | |
| 332 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 333 | If Source is NULL.\r | |
| 334 | If PcdMaximumUnicodeStringLength is not zero,\r | |
| 335 | and DestMax is greater than \r | |
| 336 | PcdMaximumUnicodeStringLength.\r | |
| 337 | If DestMax is 0.\r | |
| 338 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 339 | **/\r | |
| 340 | RETURN_STATUS\r | |
| 341 | EFIAPI\r | |
| 342 | StrCatS (\r | |
| 343 | IN OUT CHAR16 *Destination,\r | |
| 344 | IN UINTN DestMax,\r | |
| 345 | IN CONST CHAR16 *Source\r | |
| 346 | )\r | |
| 347 | {\r | |
| 348 | UINTN DestLen;\r | |
| 349 | UINTN CopyLen;\r | |
| 350 | UINTN SourceLen;\r | |
| 351 | \r | |
| 352 | ASSERT (((UINTN) Destination & BIT0) == 0);\r | |
| 353 | ASSERT (((UINTN) Source & BIT0) == 0);\r | |
| 354 | \r | |
| 355 | //\r | |
| 356 | // Let CopyLen denote the value DestMax - StrnLenS(Destination, DestMax) upon entry to StrCatS.\r | |
| 357 | //\r | |
| 358 | DestLen = StrnLenS (Destination, DestMax);\r | |
| 359 | CopyLen = DestMax - DestLen;\r | |
| 360 | \r | |
| 361 | //\r | |
| 362 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 363 | //\r | |
| 364 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 365 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 366 | \r | |
| 367 | //\r | |
| 368 | // 2. DestMax shall not be greater than RSIZE_MAX.\r | |
| 369 | //\r | |
| 370 | if (RSIZE_MAX != 0) {\r | |
| 371 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 372 | }\r | |
| 373 | \r | |
| 374 | //\r | |
| 375 | // 3. DestMax shall not equal zero.\r | |
| 376 | //\r | |
| 377 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 378 | \r | |
| 379 | //\r | |
| 380 | // 4. CopyLen shall not equal zero.\r | |
| 381 | //\r | |
| 382 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen != 0), RETURN_BAD_BUFFER_SIZE);\r | |
| 383 | \r | |
| 384 | //\r | |
| 385 | // 5. CopyLen shall be greater than StrnLenS(Source, CopyLen).\r | |
| 386 | //\r | |
| 387 | SourceLen = StrnLenS (Source, CopyLen);\r | |
| 388 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 389 | \r | |
| 390 | //\r | |
| 391 | // 6. Copying shall not take place between objects that overlap.\r | |
| 392 | //\r | |
| 393 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoStrOverlap (Destination, DestMax, (CHAR16 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 394 | \r | |
| 395 | //\r | |
| 396 | // The StrCatS function appends a copy of the string pointed to by Source (including the\r | |
| 397 | // terminating null character) to the end of the string pointed to by Destination. The initial character\r | |
| 398 | // from Source overwrites the null character at the end of Destination.\r | |
| 399 | //\r | |
| 400 | Destination = Destination + DestLen;\r | |
| 401 | while (*Source != 0) {\r | |
| 402 | *(Destination++) = *(Source++);\r | |
| 403 | }\r | |
| 404 | *Destination = 0;\r | |
| 405 | \r | |
| 406 | return RETURN_SUCCESS;\r | |
| 407 | }\r | |
| 408 | \r | |
| 409 | /**\r | |
| 410 | Appends not more than Length successive char from the string pointed to by\r | |
| 411 | Source to the end of the string pointed to by Destination. If no null char is\r | |
| 412 | copied from Source, then Destination[StrLen(Destination) + Length] is always\r | |
| 413 | set to null.\r | |
| 414 | \r | |
| 415 | If Destination is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 416 | If and Source is not aligned on a 16-bit boundary, then ASSERT().\r | |
| 417 | \r | |
| 418 | @param Destination A pointer to a Null-terminated Unicode string.\r | |
| 419 | @param DestMax The maximum number of Destination Unicode\r | |
| 420 | char, including terminating null char.\r | |
| 421 | @param Source A pointer to a Null-terminated Unicode string.\r | |
| 422 | @param Length The maximum number of Unicode characters to copy.\r | |
| 423 | \r | |
| 424 | @retval RETURN_SUCCESS String is appended.\r | |
| 425 | @retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than\r | |
| 426 | StrLen(Destination).\r | |
| 427 | @retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT\r | |
| 428 | greater than MIN(StrLen(Source), Length).\r | |
| 429 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 430 | If Source is NULL.\r | |
| 431 | If PcdMaximumUnicodeStringLength is not zero,\r | |
| 432 | and DestMax is greater than \r | |
| 433 | PcdMaximumUnicodeStringLength.\r | |
| 434 | If DestMax is 0.\r | |
| 435 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 436 | **/\r | |
| 437 | RETURN_STATUS\r | |
| 438 | EFIAPI\r | |
| 439 | StrnCatS (\r | |
| 440 | IN OUT CHAR16 *Destination,\r | |
| 441 | IN UINTN DestMax,\r | |
| 442 | IN CONST CHAR16 *Source,\r | |
| 443 | IN UINTN Length\r | |
| 444 | )\r | |
| 445 | {\r | |
| 446 | UINTN DestLen;\r | |
| 447 | UINTN CopyLen;\r | |
| 448 | UINTN SourceLen;\r | |
| 449 | \r | |
| 450 | ASSERT (((UINTN) Destination & BIT0) == 0);\r | |
| 451 | ASSERT (((UINTN) Source & BIT0) == 0);\r | |
| 452 | \r | |
| 453 | //\r | |
| 454 | // Let CopyLen denote the value DestMax - StrnLenS(Destination, DestMax) upon entry to StrnCatS.\r | |
| 455 | //\r | |
| 456 | DestLen = StrnLenS (Destination, DestMax);\r | |
| 457 | CopyLen = DestMax - DestLen;\r | |
| 458 | \r | |
| 459 | //\r | |
| 460 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 461 | //\r | |
| 462 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 463 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 464 | \r | |
| 465 | //\r | |
| 466 | // 2. Neither DestMax nor Length shall be greater than RSIZE_MAX.\r | |
| 467 | //\r | |
| 468 | if (RSIZE_MAX != 0) {\r | |
| 469 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 470 | SAFE_STRING_CONSTRAINT_CHECK ((Length <= RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 471 | }\r | |
| 472 | \r | |
| 473 | //\r | |
| 474 | // 3. DestMax shall not equal zero.\r | |
| 475 | //\r | |
| 476 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 477 | \r | |
| 478 | //\r | |
| 479 | // 4. CopyLen shall not equal zero.\r | |
| 480 | //\r | |
| 481 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen != 0), RETURN_BAD_BUFFER_SIZE);\r | |
| 482 | \r | |
| 483 | //\r | |
| 484 | // 5. If Length is not less than CopyLen, then CopyLen shall be greater than StrnLenS(Source, CopyLen).\r | |
| 485 | //\r | |
| 486 | SourceLen = StrnLenS (Source, CopyLen);\r | |
| 487 | if (Length >= CopyLen) {\r | |
| 488 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 489 | }\r | |
| 490 | \r | |
| 491 | //\r | |
| 492 | // 6. Copying shall not take place between objects that overlap.\r | |
| 493 | //\r | |
| 494 | if (SourceLen > Length) {\r | |
| 495 | SourceLen = Length;\r | |
| 496 | }\r | |
| 497 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoStrOverlap (Destination, DestMax, (CHAR16 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 498 | \r | |
| 499 | //\r | |
| 500 | // The StrnCatS function appends not more than Length successive characters (characters\r | |
| 501 | // that follow a null character are not copied) from the array pointed to by Source to the end of\r | |
| 502 | // the string pointed to by Destination. The initial character from Source overwrites the null character at\r | |
| 503 | // the end of Destination. If no null character was copied from Source, then Destination[DestMax-CopyLen+Length] is set to\r | |
| 504 | // a null character.\r | |
| 505 | //\r | |
| 506 | Destination = Destination + DestLen;\r | |
| 507 | while ((*Source != 0) && (SourceLen > 0)) {\r | |
| 508 | *(Destination++) = *(Source++);\r | |
| 509 | SourceLen--;\r | |
| 510 | }\r | |
| 511 | *Destination = 0;\r | |
| 512 | \r | |
| 513 | return RETURN_SUCCESS;\r | |
| 514 | }\r | |
| 515 | \r | |
| 516 | /**\r | |
| 517 | Returns the length of a Null-terminated Ascii string.\r | |
| 518 | \r | |
| 519 | @param String A pointer to a Null-terminated Ascii string.\r | |
| 520 | @param MaxSize The maximum number of Destination Ascii\r | |
| 521 | char, including terminating null char.\r | |
| 522 | \r | |
| 523 | @retval 0 If String is NULL.\r | |
| 524 | @retval MaxSize If there is no null character in the first MaxSize characters of String.\r | |
| 525 | @return The number of characters that percede the terminating null character.\r | |
| 526 | \r | |
| 527 | **/\r | |
| 528 | UINTN\r | |
| 529 | EFIAPI\r | |
| 530 | AsciiStrnLenS (\r | |
| 531 | IN CONST CHAR8 *String,\r | |
| 532 | IN UINTN MaxSize\r | |
| 533 | )\r | |
| 534 | {\r | |
| 535 | UINTN Length;\r | |
| 536 | \r | |
| 537 | //\r | |
| 538 | // If String is a null pointer, then the AsciiStrnLenS function returns zero.\r | |
| 539 | //\r | |
| 540 | if (String == NULL) {\r | |
| 541 | return 0;\r | |
| 542 | }\r | |
| 543 | \r | |
| 544 | //\r | |
| 545 | // Otherwise, the AsciiStrnLenS function returns the number of characters that precede the\r | |
| 546 | // terminating null character. If there is no null character in the first MaxSize characters of\r | |
| 547 | // String then AsciiStrnLenS returns MaxSize. At most the first MaxSize characters of String shall\r | |
| 548 | // be accessed by AsciiStrnLenS.\r | |
| 549 | //\r | |
| 550 | for (Length = 0; (*String != 0) && (Length < MaxSize); String++, Length++) {\r | |
| 551 | ;\r | |
| 552 | }\r | |
| 553 | return Length;\r | |
| 554 | }\r | |
| 555 | \r | |
| 556 | /**\r | |
| 557 | Copies the string pointed to by Source (including the terminating null char)\r | |
| 558 | to the array pointed to by Destination.\r | |
| 559 | \r | |
| 560 | @param Destination A pointer to a Null-terminated Ascii string.\r | |
| 561 | @param DestMax The maximum number of Destination Ascii\r | |
| 562 | char, including terminating null char.\r | |
| 563 | @param Source A pointer to a Null-terminated Ascii string.\r | |
| 564 | \r | |
| 565 | @retval RETURN_SUCCESS String is copied.\r | |
| 566 | @retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).\r | |
| 567 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 568 | If Source is NULL.\r | |
| 569 | If PcdMaximumAsciiStringLength is not zero,\r | |
| 570 | and DestMax is greater than \r | |
| 571 | PcdMaximumAsciiStringLength.\r | |
| 572 | If DestMax is 0.\r | |
| 573 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 574 | **/\r | |
| 575 | RETURN_STATUS\r | |
| 576 | EFIAPI\r | |
| 577 | AsciiStrCpyS (\r | |
| 578 | OUT CHAR8 *Destination,\r | |
| 579 | IN UINTN DestMax,\r | |
| 580 | IN CONST CHAR8 *Source\r | |
| 581 | )\r | |
| 582 | {\r | |
| 583 | UINTN SourceLen;\r | |
| 584 | \r | |
| 585 | //\r | |
| 586 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 587 | //\r | |
| 588 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 589 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 590 | \r | |
| 591 | //\r | |
| 592 | // 2. DestMax shall not be greater than ASCII_RSIZE_MAX.\r | |
| 593 | //\r | |
| 594 | if (ASCII_RSIZE_MAX != 0) {\r | |
| 595 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 596 | }\r | |
| 597 | \r | |
| 598 | //\r | |
| 599 | // 3. DestMax shall not equal zero.\r | |
| 600 | //\r | |
| 601 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 602 | \r | |
| 603 | //\r | |
| 604 | // 4. DestMax shall be greater than AsciiStrnLenS(Source, DestMax).\r | |
| 605 | //\r | |
| 606 | SourceLen = AsciiStrnLenS (Source, DestMax);\r | |
| 607 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 608 | \r | |
| 609 | //\r | |
| 610 | // 5. Copying shall not take place between objects that overlap.\r | |
| 611 | //\r | |
| 612 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoAsciiStrOverlap (Destination, DestMax, (CHAR8 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 613 | \r | |
| 614 | //\r | |
| 615 | // The AsciiStrCpyS function copies the string pointed to by Source (including the terminating\r | |
| 616 | // null character) into the array pointed to by Destination.\r | |
| 617 | //\r | |
| 618 | while (*Source != 0) {\r | |
| 619 | *(Destination++) = *(Source++);\r | |
| 620 | }\r | |
| 621 | *Destination = 0;\r | |
| 622 | \r | |
| 623 | return RETURN_SUCCESS;\r | |
| 624 | }\r | |
| 625 | \r | |
| 626 | /**\r | |
| 627 | Copies not more than Length successive char from the string pointed to by\r | |
| 628 | Source to the array pointed to by Destination. If no null char is copied from\r | |
| 629 | Source, then Destination[Length] is always set to null.\r | |
| 630 | \r | |
| 631 | @param Destination A pointer to a Null-terminated Ascii string.\r | |
| 632 | @param DestMax The maximum number of Destination Ascii\r | |
| 633 | char, including terminating null char.\r | |
| 634 | @param Source A pointer to a Null-terminated Ascii string.\r | |
| 635 | @param Length The maximum number of Ascii characters to copy.\r | |
| 636 | \r | |
| 637 | @retval RETURN_SUCCESS String is copied.\r | |
| 638 | @retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than \r | |
| 639 | MIN(StrLen(Source), Length).\r | |
| 640 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 641 | If Source is NULL.\r | |
| 642 | If PcdMaximumAsciiStringLength is not zero,\r | |
| 643 | and DestMax is greater than \r | |
| 644 | PcdMaximumAsciiStringLength.\r | |
| 645 | If DestMax is 0.\r | |
| 646 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 647 | **/\r | |
| 648 | RETURN_STATUS\r | |
| 649 | EFIAPI\r | |
| 650 | AsciiStrnCpyS (\r | |
| 651 | OUT CHAR8 *Destination,\r | |
| 652 | IN UINTN DestMax,\r | |
| 653 | IN CONST CHAR8 *Source,\r | |
| 654 | IN UINTN Length\r | |
| 655 | )\r | |
| 656 | {\r | |
| 657 | UINTN SourceLen;\r | |
| 658 | \r | |
| 659 | //\r | |
| 660 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 661 | //\r | |
| 662 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 663 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 664 | \r | |
| 665 | //\r | |
| 666 | // 2. Neither DestMax nor Length shall be greater than ASCII_RSIZE_MAX\r | |
| 667 | //\r | |
| 668 | if (ASCII_RSIZE_MAX != 0) {\r | |
| 669 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 670 | SAFE_STRING_CONSTRAINT_CHECK ((Length <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 671 | }\r | |
| 672 | \r | |
| 673 | //\r | |
| 674 | // 3. DestMax shall not equal zero.\r | |
| 675 | //\r | |
| 676 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 677 | \r | |
| 678 | //\r | |
| 679 | // 4. If Length is not less than DestMax, then DestMax shall be greater than AsciiStrnLenS(Source, DestMax).\r | |
| 680 | //\r | |
| 681 | SourceLen = AsciiStrnLenS (Source, DestMax);\r | |
| 682 | if (Length >= DestMax) {\r | |
| 683 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 684 | }\r | |
| 685 | \r | |
| 686 | //\r | |
| 687 | // 5. Copying shall not take place between objects that overlap.\r | |
| 688 | //\r | |
| 689 | if (SourceLen > Length) {\r | |
| 690 | SourceLen = Length;\r | |
| 691 | }\r | |
| 692 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoAsciiStrOverlap (Destination, DestMax, (CHAR8 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 693 | \r | |
| 694 | //\r | |
| 695 | // The AsciiStrnCpyS function copies not more than Length successive characters (characters that\r | |
| 696 | // follow a null character are not copied) from the array pointed to by Source to the array\r | |
| 697 | // pointed to by Destination. If no null character was copied from Source, then Destination[Length] is set to a null\r | |
| 698 | // character.\r | |
| 699 | //\r | |
| 700 | while ((*Source != 0) && (SourceLen > 0)) {\r | |
| 701 | *(Destination++) = *(Source++);\r | |
| 702 | SourceLen--;\r | |
| 703 | }\r | |
| 704 | *Destination = 0;\r | |
| 705 | \r | |
| 706 | return RETURN_SUCCESS;\r | |
| 707 | }\r | |
| 708 | \r | |
| 709 | /**\r | |
| 710 | Appends a copy of the string pointed to by Source (including the terminating\r | |
| 711 | null char) to the end of the string pointed to by Destination.\r | |
| 712 | \r | |
| 713 | @param Destination A pointer to a Null-terminated Ascii string.\r | |
| 714 | @param DestMax The maximum number of Destination Ascii\r | |
| 715 | char, including terminating null char.\r | |
| 716 | @param Source A pointer to a Null-terminated Ascii string.\r | |
| 717 | \r | |
| 718 | @retval RETURN_SUCCESS String is appended.\r | |
| 719 | @retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than \r | |
| 720 | StrLen(Destination).\r | |
| 721 | @retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT\r | |
| 722 | greater than StrLen(Source).\r | |
| 723 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 724 | If Source is NULL.\r | |
| 725 | If PcdMaximumAsciiStringLength is not zero,\r | |
| 726 | and DestMax is greater than \r | |
| 727 | PcdMaximumAsciiStringLength.\r | |
| 728 | If DestMax is 0.\r | |
| 729 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 730 | **/\r | |
| 731 | RETURN_STATUS\r | |
| 732 | EFIAPI\r | |
| 733 | AsciiStrCatS (\r | |
| 734 | IN OUT CHAR8 *Destination,\r | |
| 735 | IN UINTN DestMax,\r | |
| 736 | IN CONST CHAR8 *Source\r | |
| 737 | )\r | |
| 738 | {\r | |
| 739 | UINTN DestLen;\r | |
| 740 | UINTN CopyLen;\r | |
| 741 | UINTN SourceLen;\r | |
| 742 | \r | |
| 743 | //\r | |
| 744 | // Let CopyLen denote the value DestMax - AsciiStrnLenS(Destination, DestMax) upon entry to AsciiStrCatS.\r | |
| 745 | //\r | |
| 746 | DestLen = AsciiStrnLenS (Destination, DestMax);\r | |
| 747 | CopyLen = DestMax - DestLen;\r | |
| 748 | \r | |
| 749 | //\r | |
| 750 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 751 | //\r | |
| 752 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 753 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 754 | \r | |
| 755 | //\r | |
| 756 | // 2. DestMax shall not be greater than ASCII_RSIZE_MAX.\r | |
| 757 | //\r | |
| 758 | if (ASCII_RSIZE_MAX != 0) {\r | |
| 759 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 760 | }\r | |
| 761 | \r | |
| 762 | //\r | |
| 763 | // 3. DestMax shall not equal zero.\r | |
| 764 | //\r | |
| 765 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 766 | \r | |
| 767 | //\r | |
| 768 | // 4. CopyLen shall not equal zero.\r | |
| 769 | //\r | |
| 770 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen != 0), RETURN_BAD_BUFFER_SIZE);\r | |
| 771 | \r | |
| 772 | //\r | |
| 773 | // 5. CopyLen shall be greater than AsciiStrnLenS(Source, CopyLen).\r | |
| 774 | //\r | |
| 775 | SourceLen = AsciiStrnLenS (Source, CopyLen);\r | |
| 776 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 777 | \r | |
| 778 | //\r | |
| 779 | // 6. Copying shall not take place between objects that overlap.\r | |
| 780 | //\r | |
| 781 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoAsciiStrOverlap (Destination, DestMax, (CHAR8 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 782 | \r | |
| 783 | //\r | |
| 784 | // The AsciiStrCatS function appends a copy of the string pointed to by Source (including the\r | |
| 785 | // terminating null character) to the end of the string pointed to by Destination. The initial character\r | |
| 786 | // from Source overwrites the null character at the end of Destination.\r | |
| 787 | //\r | |
| 788 | Destination = Destination + DestLen;\r | |
| 789 | while (*Source != 0) {\r | |
| 790 | *(Destination++) = *(Source++);\r | |
| 791 | }\r | |
| 792 | *Destination = 0;\r | |
| 793 | \r | |
| 794 | return RETURN_SUCCESS;\r | |
| 795 | }\r | |
| 796 | \r | |
| 797 | /**\r | |
| 798 | Appends not more than Length successive char from the string pointed to by\r | |
| 799 | Source to the end of the string pointed to by Destination. If no null char is\r | |
| 800 | copied from Source, then Destination[StrLen(Destination) + Length] is always\r | |
| 801 | set to null.\r | |
| 802 | \r | |
| 803 | @param Destination A pointer to a Null-terminated Ascii string.\r | |
| 804 | @param DestMax The maximum number of Destination Ascii\r | |
| 805 | char, including terminating null char.\r | |
| 806 | @param Source A pointer to a Null-terminated Ascii string.\r | |
| 807 | @param Length The maximum number of Ascii characters to copy.\r | |
| 808 | \r | |
| 809 | @retval RETURN_SUCCESS String is appended.\r | |
| 810 | @retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than\r | |
| 811 | StrLen(Destination).\r | |
| 812 | @retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT\r | |
| 813 | greater than MIN(StrLen(Source), Length).\r | |
| 814 | @retval RETURN_INVALID_PARAMETER If Destination is NULL.\r | |
| 815 | If Source is NULL.\r | |
| 816 | If PcdMaximumAsciiStringLength is not zero,\r | |
| 817 | and DestMax is greater than \r | |
| 818 | PcdMaximumAsciiStringLength.\r | |
| 819 | If DestMax is 0.\r | |
| 820 | @retval RETURN_ACCESS_DENIED If Source and Destination overlap.\r | |
| 821 | **/\r | |
| 822 | RETURN_STATUS\r | |
| 823 | EFIAPI\r | |
| 824 | AsciiStrnCatS (\r | |
| 825 | IN OUT CHAR8 *Destination,\r | |
| 826 | IN UINTN DestMax,\r | |
| 827 | IN CONST CHAR8 *Source,\r | |
| 828 | IN UINTN Length\r | |
| 829 | )\r | |
| 830 | {\r | |
| 831 | UINTN DestLen;\r | |
| 832 | UINTN CopyLen;\r | |
| 833 | UINTN SourceLen;\r | |
| 834 | \r | |
| 835 | //\r | |
| 836 | // Let CopyLen denote the value DestMax - AsciiStrnLenS(Destination, DestMax) upon entry to AsciiStrnCatS.\r | |
| 837 | //\r | |
| 838 | DestLen = AsciiStrnLenS (Destination, DestMax);\r | |
| 839 | CopyLen = DestMax - DestLen;\r | |
| 840 | \r | |
| 841 | //\r | |
| 842 | // 1. Neither Destination nor Source shall be a null pointer.\r | |
| 843 | //\r | |
| 844 | SAFE_STRING_CONSTRAINT_CHECK ((Destination != NULL), RETURN_INVALID_PARAMETER);\r | |
| 845 | SAFE_STRING_CONSTRAINT_CHECK ((Source != NULL), RETURN_INVALID_PARAMETER);\r | |
| 846 | \r | |
| 847 | //\r | |
| 848 | // 2. Neither DestMax nor Length shall be greater than ASCII_RSIZE_MAX.\r | |
| 849 | //\r | |
| 850 | if (ASCII_RSIZE_MAX != 0) {\r | |
| 851 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 852 | SAFE_STRING_CONSTRAINT_CHECK ((Length <= ASCII_RSIZE_MAX), RETURN_INVALID_PARAMETER);\r | |
| 853 | }\r | |
| 854 | \r | |
| 855 | //\r | |
| 856 | // 3. DestMax shall not equal zero.\r | |
| 857 | //\r | |
| 858 | SAFE_STRING_CONSTRAINT_CHECK ((DestMax != 0), RETURN_INVALID_PARAMETER);\r | |
| 859 | \r | |
| 860 | //\r | |
| 861 | // 4. CopyLen shall not equal zero.\r | |
| 862 | //\r | |
| 863 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen != 0), RETURN_BAD_BUFFER_SIZE);\r | |
| 864 | \r | |
| 865 | //\r | |
| 866 | // 5. If Length is not less than CopyLen, then CopyLen shall be greater than AsciiStrnLenS(Source, CopyLen).\r | |
| 867 | //\r | |
| 868 | SourceLen = AsciiStrnLenS (Source, CopyLen);\r | |
| 869 | if (Length >= CopyLen) {\r | |
| 870 | SAFE_STRING_CONSTRAINT_CHECK ((CopyLen > SourceLen), RETURN_BUFFER_TOO_SMALL);\r | |
| 871 | }\r | |
| 872 | \r | |
| 873 | //\r | |
| 874 | // 6. Copying shall not take place between objects that overlap.\r | |
| 875 | //\r | |
| 876 | if (SourceLen > Length) {\r | |
| 877 | SourceLen = Length;\r | |
| 878 | }\r | |
| 879 | SAFE_STRING_CONSTRAINT_CHECK (InternalSafeStringNoAsciiStrOverlap (Destination, DestMax, (CHAR8 *)Source, SourceLen + 1), RETURN_ACCESS_DENIED);\r | |
| 880 | \r | |
| 881 | //\r | |
| 882 | // The AsciiStrnCatS function appends not more than Length successive characters (characters\r | |
| 883 | // that follow a null character are not copied) from the array pointed to by Source to the end of\r | |
| 884 | // the string pointed to by Destination. The initial character from Source overwrites the null character at\r | |
| 885 | // the end of Destination. If no null character was copied from Source, then Destination[DestMax-CopyLen+Length] is set to\r | |
| 886 | // a null character.\r | |
| 887 | //\r | |
| 888 | Destination = Destination + DestLen;\r | |
| 889 | while ((*Source != 0) && (SourceLen > 0)) {\r | |
| 890 | *(Destination++) = *(Source++);\r | |
| 891 | SourceLen--;\r | |
| 892 | }\r | |
| 893 | *Destination = 0;\r | |
| 894 | \r | |
| 895 | return RETURN_SUCCESS;\r | |
| 896 | }\r |