vsprintf

Prints formatted output based on an argument list.

This function is the same as the sprintf function except that instead of being called with a variable number of arguments, it is called with an argument list that has been initialized by va_start (and possibly with subsequent va_arg calls).

Format

#include  <stdio.h>

int vsprintf  (char *str, const char *format,
              va_list arg);

Arguments

str

A pointer to a string that will receive the formatted output. This string is assumed to be large enough to hold the output.

format

A pointer to a character string that contains the format specification. For more information about format and conversion specifications and their corresponding arguments, see Chapter 2.

arg

A list of expressions whose resultant types correspond to the conversion specifications given in the format specifications.

Return Value

x	The number of bytes written.
Negative value	Indicates an output error occurred.The function sets errno. For a list of possible errno values set, see fprintf in this section.

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