vasprintf

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 NUL, 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.

NOTES
       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)