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/* Copyright (C) 2007 Eric Blake

 * Permission to use, copy, modify, and distribute this software

 * is freely granted, provided that this notice is preserved.

 */

/* This code was derived from asprintf.c */

/* doc in vfprintf.c */

#include <_ansi.h>

#include <reent.h>

#include <stdio.h>

#include <stdarg.h>

#include <limits.h>

#include <errno.h>

#include "local.h"

char *

_DEFUN(_vasnprintf_r, (ptr, buf, lenp, fmt, ap),

       struct _reent *ptr _AND

       char *buf _AND

       size_t *lenp _AND

       const char *fmt _AND

       va_list ap)

{

  int ret;

  FILE f;

  size_t len = *lenp;

  if (buf && len)

    {

      /* mark an existing buffer, but allow allocation of larger string */

      f._flags = __SWR | __SSTR | __SOPT;

    }

  else

    {

      /* mark a zero-length reallocatable buffer */

      f._flags = __SWR | __SSTR | __SMBF;

      len = 0;

      buf = NULL;

    }

  f._bf._base = f._p = (unsigned char *) buf;

  /* For now, inherit the 32-bit signed limit of FILE._bf._size.

     FIXME - it would be nice to rewrite sys/reent.h to support size_t

     for _size.  */

  if (len > INT_MAX)

    {

      ptr->_errno = EOVERFLOW;

      return NULL;

    }

  f._bf._size = f._w = len;

  f._file = -1;  /* No file. */

  ret = _svfprintf_r (ptr, &f, fmt, ap);

  if (ret < 0)

    return NULL;

  *lenp = ret;

  *f._p = '\0';

  return (char *) f._bf._base;

}

#ifndef _REENT_ONLY

char *

_DEFUN(vasnprintf, (buf, lenp, fmt, ap),

       char *buf _AND

       size_t *lenp _AND

       const char *fmt _AND

       va_list ap)

{

  return _vasnprintf_r (_REENT, buf, lenp, fmt, ap);

}

#endif /* ! _REENT_ONLY */