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1//
2// wcscspn.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines wcscspn(), which searches a string for an initial substring that does
7// not contain any of the specified control characters.
8//
9// This function returns the index of the first character in the string that
10// belongs to the set of characters specified by 'control'. This is equivalent
11// to the length of the initial substring of 'string' composed entirely of
12// characters that are not in 'control'.
13//
14#include <string.h>
15
16
17
18extern "C" size_t __cdecl wcscspn(
19 wchar_t const* const string,
20 wchar_t const* const control
21 )
22{
23 wchar_t const* string_it = string;
24 for (; *string_it; ++string_it)
25 {
26 for (wchar_t const* control_it = control; *control_it; ++control_it)
27 {
28 if (*string_it == *control_it)
29 {
30 return static_cast<size_t>(string_it - string);
31 }
32 }
33 }
34
35 return static_cast<size_t>(string_it - string);
36}