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



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(e) 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(f).  If memory allocation
       wasn't possible, or some other error occurs,  these  func-
       tions  will  return  -1, and the contents of strp is unde-
       fined.

NOTES
       These functions are GNU extensions, not  in  C  or  POSIX.
       They are also available under *BSD.  The FreeBSD implemen-
       tation sets strp to NULL on error.

SEE ALSO
       free(e), malloc(c), printf(f)




GNU                         2001-12-18                ASPRINTF(F)