wcstok.cpp File Reference

#include <corecrt_internal.h>
#include <string.h>

Include dependency graph for wcstok.cpp:

Go to the source code of this file.

Functions
_Check_return_ wchar_t *__cdecl	__acrt_wcstok_s_novalidation (_Inout_opt_z_ wchar_t *string, _In_z_ wchar_t const *control, _Inout_ _Deref_prepost_opt_z_ wchar_t **context)
wchar_t *__cdecl	wcstok (wchar_t *const string, wchar_t const *const control, wchar_t **const context)

Function Documentation

__acrt_wcstok_s_novalidation()

_Check_return_ wchar_t *__cdecl __acrt_wcstok_s_novalidation	(	_Inout_opt_z_ wchar_t *	string,
		_In_z_ wchar_t const *	control,
		_Inout_ _Deref_prepost_opt_z_ wchar_t **	context
	)

Definition at line 16 of file wcstok_s.cpp.

{
    // If string is null, set the iterator to the saved pointer (i.e., continue
    // breaking tokens out of the string from the last strtok call):
    wchar_t* string_it = string != nullptr
        ? string
        : *context;
 
 
    // Find beginning of token (skip over leading delimiters). Note that
    // there is no token iff this loop sets string to point to the terminal
    // null (*string == '\0')
    while (*string_it)
    {
        wchar_t const* control_it = control;
        for (; *control_it && *control_it != *string_it; ++control_it)
        {
        }
 
        if (!*control_it)
            break;
 
        ++string_it;
    }
 
    wchar_t* const token_first = string_it;
 
    // Find the end of the token.  If it is not the end of the string, put a
    // null character there:
    for (; *string_it; ++string_it)
    {
        wchar_t const* control_it = control;
        for (; *control_it && *control_it != *string_it; ++control_it)
        {
        }
 
        if (*control_it)
        {
            *string_it++ = '\0';
            break;
        }
    }
 
    // Update the saved pointer:
    *context = string_it;
 
    // Determine if a token has been found.
    return string_it != token_first ? token_first : nullptr;
}

Referenced by wcstok(), and wcstok_s().

wcstok()

wchar_t *__cdecl wcstok	(	wchar_t *const	string,
		wchar_t const *const	control,
		wchar_t **const	context
	)

Definition at line 23 of file wcstok.cpp.

{
    wchar_t** const context_to_use = context != nullptr
        ? context
        : &__acrt_getptd()->_wcstok_token;
 
    return __acrt_wcstok_s_novalidation(string, control, context_to_use);
}