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 are undefined.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +------------------------+---------------+----------------+
       |Interface		| Attribute	| Value 	 |
       +------------------------+---------------+----------------+
       |asprintf(), vasprintf() | Thread safety | MT-Safe locale |
       +------------------------+---------------+----------------+

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 4.15 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/.

GNU
								    2017-09-15							       ASPRINTF(3)