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• NAME
• SYNOPSIS
• DESCRIPTION
• RETURN VALUE
• CONFORMING TO
• SEE ALSO
• COMMENTS

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 analogues of sprintf() and
       vsprintf(), 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 parameter.  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)



GNU                               2001-12-18                       ASPRINTF(3)

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