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+.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.\" Text fragments inspired by Martin Schulze <joey@infodrom.org>.
+.\"
+.TH ASPRINTF 3 2001-12-18 "GNU" "Linux Programmer's Manual"
+.SH NAME
+asprintf, vasprintf \- print to allocated string
+.SH SYNOPSIS
+.B #define _GNU_SOURCE
+.br
+.B #include <stdio.h>
+.sp
+.BI "int asprintf(char **" strp ", const char *" fmt ", ...);"
+.sp
+.BI "int vasprintf(char **" strp ", const char *" fmt ", va_list " ap );
+.SH DESCRIPTION
+The functions
+.B asprintf
+and
+.B vasprintf
+are analogues of
+.B sprintf
+and
+.BR vsprintf ,
+except that they allocate a string large enough to hold the output
+including the terminating NUL,
+and return a pointer to it via the first parameter.
+This pointer should be passed to
+.BR free (3)
+to release the allocated storage when it is no longer needed.
+.SH "RETURN VALUE"
+When successful, these functions return the number of bytes printed,
+just like
+.BR sprintf (3).
+If memory allocation wasn't possible, or some other error occurs,
+these functions will return \-1, and the contents of
+.I strp
+is undefined.
+.SH NOTES
+These functions are GNU extensions, not in C or POSIX.
+They are also available under *BSD.
+The FreeBSD implementation sets
+.I strp
+to NULL on error.
+.SH "SEE ALSO"
+.BR free (3),
+.BR malloc (3),
+.BR printf (3)