vprintf(3S)

NAME

vprintf(), vfprintf(), vsprintf() − print formatted output of a varargs argument list

SYNOPSIS

#include <stdio.h>
#include <varargs.h>

int vprintf(const char *format, va_list ap);

int vfprintf(FILE *stream, const char *format, va_list ap);

int vsprintf(char *s, const char *format, va_list ap);

DESCRIPTION

vprintf(), vfprintf(), and vsprintf() are the same as printf(), fprintf(), and sprintf() respectively, except that instead of being called with a variable number of arguments, they are called with an argument list as defined by varargs(5).

EXAMPLE

The following demonstrates how vfprintf() could be used to write an error routine:

#include <stdio.h>
#include <varargs.h>
.
.
.
/*
*error should be called using the form
*error(function_name, format, arg1, arg2...);
*/
/*VARARGS0*/
void
error(va_alist)
va_dcl
{
va_list args;
char *fmt;
va_start(args);
/* print out name of function causing error */
(void)fprintf(stderr, "ERROR in %s: ", va_arg(args, char *));
fmt = va_arg(args, char *);
/* print out remainder of message */
(void)vfprintf(stderr, fmt, args);
va_end(args);
(void)abort( );
}

STANDARDS CONFORMANCE

vprintf(): AES, SVID2, XPG2, XPG3, XPG4, ANSI C

vfprintf(): AES, SVID2, XPG2, XPG3, XPG4, ANSI C

vsprintf(): AES, SVID2, XPG2, XPG3, XPG4, ANSI C

Hewlett-Packard Company — HP-UX Release 9.0: August 1992

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