asprintf, vasprintf — print to allocated string
#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); |
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 ('\0'), 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.
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 are
undefined.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
asprintf(), vasprintf() |
Thread safety | MT-Safe locale |
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.
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (C) 2001 Andries Brouwer <aebcwi.nl> %%%LICENSE_START(VERBATIM) 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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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. %%%LICENSE_END Text fragments inspired by Martin Schulze <joeyinfodrom.org>. |