| // |
| // Copyright (c) 2017 The Khronos Group Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| #include <string.h> |
| #if !defined(_MSC_VER) |
| #include <stdint.h> |
| #endif // !_MSC_VER |
| |
| size_t doReplace(char* dest, size_t destLength, const char* source, |
| const char* stringToReplace1, const char* replaceWith1, |
| const char* stringToReplace2, const char* replaceWith2) |
| { |
| size_t copyCount = 0; |
| const char* sourcePtr = source; |
| char* destPtr = dest; |
| const char* ptr1; |
| const char* ptr2; |
| size_t nJump; |
| size_t len1, len2; |
| size_t lenReplace1, lenReplace2; |
| len1 = strlen(stringToReplace1); |
| len2 = strlen(stringToReplace2); |
| lenReplace1 = strlen(replaceWith1); |
| lenReplace2 = strlen(replaceWith2); |
| for (; copyCount < destLength && *sourcePtr;) |
| { |
| ptr1 = strstr(sourcePtr, stringToReplace1); |
| ptr2 = strstr(sourcePtr, stringToReplace2); |
| if (ptr1 != NULL && (ptr2 == NULL || ptr2 > ptr1)) |
| { |
| nJump = ptr1 - sourcePtr; |
| if (((uintptr_t)ptr1 - (uintptr_t)sourcePtr) |
| > destLength - copyCount) |
| { |
| return -1; |
| } |
| copyCount += nJump; |
| strncpy(destPtr, sourcePtr, nJump); |
| destPtr += nJump; |
| sourcePtr += nJump + len1; |
| strcpy(destPtr, replaceWith1); |
| destPtr += lenReplace1; |
| } |
| else if (ptr2 != NULL && (ptr1 == NULL || ptr1 >= ptr2)) |
| { |
| nJump = ptr2 - sourcePtr; |
| if (nJump > destLength - copyCount) |
| { |
| return -2; |
| } |
| copyCount += nJump; |
| strncpy(destPtr, sourcePtr, nJump); |
| destPtr += nJump; |
| sourcePtr += nJump + len2; |
| strcpy(destPtr, replaceWith2); |
| destPtr += lenReplace2; |
| } |
| else |
| { |
| nJump = strlen(sourcePtr); |
| if (nJump > destLength - copyCount) |
| { |
| return -3; |
| } |
| copyCount += nJump; |
| strcpy(destPtr, sourcePtr); |
| destPtr += nJump; |
| sourcePtr += nJump; |
| } |
| } |
| *destPtr = '\0'; |
| return copyCount; |
| } |
| |
| size_t doSingleReplace(char* dest, size_t destLength, const char* source, |
| const char* stringToReplace, const char* replaceWith) |
| { |
| size_t copyCount = 0; |
| const char* sourcePtr = source; |
| char* destPtr = dest; |
| const char* ptr; |
| size_t nJump; |
| size_t len; |
| size_t lenReplace; |
| len = strlen(stringToReplace); |
| lenReplace = strlen(replaceWith); |
| for (; copyCount < destLength && *sourcePtr;) |
| { |
| ptr = strstr(sourcePtr, stringToReplace); |
| if (ptr != NULL) |
| { |
| nJump = ptr - sourcePtr; |
| if (((uintptr_t)ptr - (uintptr_t)sourcePtr) |
| > destLength - copyCount) |
| { |
| return -1; |
| } |
| copyCount += nJump; |
| strncpy(destPtr, sourcePtr, nJump); |
| destPtr += nJump; |
| sourcePtr += nJump + len; |
| strcpy(destPtr, replaceWith); |
| destPtr += lenReplace; |
| } |
| else |
| { |
| nJump = strlen(sourcePtr); |
| if (nJump > destLength - copyCount) |
| { |
| return -3; |
| } |
| copyCount += nJump; |
| strcpy(destPtr, sourcePtr); |
| destPtr += nJump; |
| sourcePtr += nJump; |
| } |
| } |
| *destPtr = '\0'; |
| return copyCount; |
| } |