HP-UX Reference (11i v2 04/09) - 3 Library Functions N-Z (vol 7)

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vprintf(3S) vprintf(3S)

NAME

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

SYNOPSIS

#include <stdarg.h>

#include <stdio.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);

int vsnprintf(char *s, size_t maxsize, const char *format, va_list ap);

DESCRIPTION

vprintf(), vfprintf(), vsprintf(), and

vsnprintf() are the same as printf(),

fprintf(), sprintf(), and snprintf() respectively, except that instead of being called with a

variable number of arguments, they are called with an argument list as deﬁned by

<stdarg.h>.

EXAMPLE

The following demonstrates how

vfprintf() could be used to write an error routine:

#include <stdarg.h>

#include <stdio.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( );

}