VFSCANF(3) Library Functions Manual VFSCANF(3)

NAME

vfscanf vscanf vsscanf — format input of a stdarg argument list

SYNOPSIS

#include <stdarg.h>
#include <stdio.h>

int vfscanf(FILE *restrict stream, const char *restrict format,
       va_list arg);
int vscanf(const char *restrict format, va_list arg);
int vsscanf(const char *restrict s, const char *restrict format,
       va_list arg);

DESCRIPTION

[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

The vscanf (), vfscanf (), and vsscanf () functions shall be equivalent to the scanf(3), fscanf(3), and sscanf(3) functions, respectively, except that instead of being called with a variable number of arguments, they are called with an argument list as defined in the <stdarg.h> header. These functions shall not invoke the va_end macro. As these functions invoke the va_arg macro, the value of ap after the return is unspecified.