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SuSE 11.3 - man page for vasprintf (suse section 3)

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

       asprintf, vasprintf - print to allocated string

       #define _GNU_SOURCE
       #include <stdio.h>

       int asprintf(char **strp, const char *fmt, ...);

       int vasprintf(char **strp, const char *fmt, va_list ap);

       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.

       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.

       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.

       free(3), malloc(3), printf(3), feature_test_macros(7)

       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.ker-

GNU					    2001-12-18				      ASPRINTF(3)
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