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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 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), 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 information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2001-12-18                       ASPRINTF(3)

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