vscnprintf (9) - Linux Manuals

vscnprintf: Format a string and place it in a buffer

Command to display vscnprintf manual in Linux: $ man 9 vscnprintf

NAME

vscnprintf - Format a string and place it in a buffer

SYNOPSIS

int vscnprintf(char * buf, size_t size, const char * fmt, va_list args);

ARGUMENTS

buf

: The buffer to place the result into

size

: The size of the buffer, including the trailing null space

fmt

: The format string to use

args

: Arguments for the format string

DESCRIPTION

The return value is the number of characters which have been written into the buf not including the trailing '\0'. If size is == 0 the function returns 0.

If you're not already dealing with a va_list consider using scnprintf.

See the vsnprintf documentation for format string extensions over C99.