Web Reference: Jan 11, 2025 · Note: The official implementation of strstr () is unspecified, its implementation is assumed to consist of any of the standard string matching algorithms. Here, we have assumed that it is implemented using Knuth-Morris-Pratt algorithm, which has time and space complexity as stated above. /* Simple implementation of strstr for systems without it. This function is in the public domain. */ Oct 5, 2024 · Pointer to the first character of the found substring in str, or a null pointer if such substring is not found. If substr points to an empty string, str is returned.
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