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_vscprintf, _vscprintf_l, _vscwprintf, _vscwprintf_l
Returns the number of characters in the formatted string using a pointer to a list of arguments.
int _vscprintf( const char *format, va_list argptr ); int _vscprintf_l( const char *format, locale_t locale, va_list argptr ); int _vscwprintf( const wchar_t *format, va_list argptr ); int _vscwprintf_l( const wchar_t *format, locale_t locale, va_list argptr );
_vscprintf returns the number of characters that would be generated if the string pointed to by the list of arguments was printed or sent to a file or buffer using the specified formatting codes. The value returned does not include the terminating null character. _vscwprintf performs the same function for wide characters.
The versions of these functions with the _l suffix are identical except that they use the locale parameter passed in instead of the current thread locale.
If format is a null pointer, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, the functions return -1 and set errno to EINVAL.
Each argument (if any) is converted according to the corresponding format specification in format. The format consists of ordinary characters and has the same form and function as the format argument for printf.
Ensure that if format is a user-defined string, it is null terminated and has the correct number and type of parameters. For more information, see Avoiding Buffer Overruns.
_UNICODE & _MBCS not defined
<stdio.h> or <wchar.h>
For additional compatibility information, see Compatibility in the Introduction.