vprintf

vprintf

Write Formatted Output to the Standard Output Stream

Portability: ISO/ANSI C conforming

SYNOPSIS
DESCRIPTION
RETURN VALUE
EXAMPLE
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

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

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

DESCRIPTION

vprintf is equivalent to printf with arg replacing the variable-argument list. arg has been initialized by the va_start macro and possibly va_arg calls. vfprintf does not invoke the va_end macro. See va_arg, va_end, and va_start for details on varying-length argument-list functions.

RETURN VALUE

vprintf returns the number of characters transmitted to stdout or a negative value if an output error occurs.

EXAMPLE

This example sends an error message prefix to stdout with printf and sends the remaining text to stdout with vprintf :

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

void error(char *fname, char *format, ...)
{
   va_list args;
   va_start(args, format);
   printf("ERROR in %s: ", fname);
   vprintf(format, args);
   va_end(args);
}

RELATED FUNCTIONS

printf , va_start , vfprintf