mirror of https://github.com/mkerrisk/man-pages
69 lines
2.3 KiB
Groff
69 lines
2.3 KiB
Groff
|
.\" 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.\" manual page may be incorrect or out-of-date.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)
|