centos man page for asprintf

ASPRINTF(3)						     Linux Programmer's Manual						       ASPRINTF(3)

NAME
       asprintf, vasprintf - print to allocated string

SYNOPSIS
       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #include <stdio.h>

       int asprintf(char **strp, const char *fmt, ...);

       int vasprintf(char **strp, const char *fmt, va_list ap);

DESCRIPTION
       The functions asprintf() and vasprintf() are analogs of sprintf(3) and vsprintf(3), except that they allocate a string large enough to hold
       the output including the terminating null byte (''), and return a pointer to it via the first argument.  This pointer should be passed to
       free(3) to release the allocated storage when it is no longer needed.

RETURN VALUE
       When  successful,  these functions return the number of bytes printed, just like sprintf(3).  If memory allocation wasn't possible, or some
       other error occurs, these functions will return -1, and the contents of strp is undefined.

CONFORMING TO
       These functions are GNU extensions, not in C or POSIX.  They are also available under *BSD.  The FreeBSD implementation sets strp  to  NULL
       on error.

SEE ALSO
       free(3), malloc(3), printf(3)

COLOPHON
       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2013-06-21							       ASPRINTF(3)