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



NAME
       asprintf, vasprintf - print to allocated string

SYNOPSIS
       #define _GNU_SOURCE
       #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), feature_test_macros(7)

COLOPHON
       This  page  is  part of release 3.25 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                                                        2001-12-18                                                ASPRINTF(3)