4.73 vfwscanf, vwscanf, vswscanf—scan and format argument list from wide character input

Synopsis

#include <stdio.h>
#include <stdarg.h>
int vwscanf(const wchar_t *__restrict fmt, va_list list);
int vfwscanf(FILE *__restrict fp,
    const wchar_t *__restrict fmt, va_list list);
int vswscanf(const wchar_t *__restrict str,
    const wchar_t *__restrict fmt, va_list list);

int _vwscanf(struct _reent *reent, const wchar_t *fmt,
    va_list list);
int _vfwscanf(struct _reent *reent, FILE *fp,
    const wchar_t *fmt, va_list list);
int _vswscanf(struct _reent *reent, const wchar_t *str,
    const wchar_t *fmt, va_list list);

Description
vwscanf, vfwscanf, and vswscanf are (respectively) variants of wscanf, fwscanf, and swscanf. They differ only in allowing their caller to pass the variable argument list as a va_list object (initialized by va_start) rather than directly accepting a variable number of arguments.

Returns
The return values are consistent with the corresponding functions: vwscanf returns the number of input fields successfully scanned, converted, and stored; the return value does not include scanned fields which were not stored.

If vwscanf attempts to read at end-of-file, the return value is EOF.

If no fields were stored, the return value is 0.

The routines _vwscanf, _vfwscanf, and _vswscanf are reentrant versions which take an additional first parameter which points to the reentrancy structure.

Portability
C99, POSIX-1.2008