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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  alloca-
       tion  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 imple-
       mentation 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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2001-12-18                       ASPRINTF(3)