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12345678910111213141516171819202122232425262728293031323334353637//// wcsspn.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines wcsspn(), which finds the length of the initial substring of 'string'// that consists entirely of characters in 'control'. This function returns the// index of the first character in the string that does not belong to the set of// characters in the control string. If there is no such character, the length// of the string is returned.//#include <string.h>
extern "C" size_t __cdecl wcsspn( wchar_t const* const string, wchar_t const* const control ){ wchar_t const* string_it = string; for (; *string_it; ++string_it) { for (wchar_t const* control_it = control; *string_it != *control_it; ++control_it) { // Reached the end of the control string without finding a match: if (*control_it == 0) { return static_cast<size_t>(string_it - string); } } }
// The whole string consisted of characters from the control: return static_cast<size_t>(string_it - string);}