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sfprints.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#include    "sfhdr.h"

/*    Construct a string with the given format and data.
**    This function allocates space as necessary to store the string.
**    This avoids overflow problems typical with sprintf() in stdio.
**
**    Written by Kiem-Phong Vo.
*/

#if __STD_C
char* sfprints(const char* form, ...)
#else
char* sfprints(va_alist)
va_dcl
#endif
{
      va_list           args;
      reg int           rv;
      static Sfio_t*    f;

#if __STD_C
      va_start(args,form);
#else
      reg char    *form;
      va_start(args);
      form = va_arg(args,char*);
#endif

      /* make a fake stream */
      if(!f &&
         !(f = sfnew(NIL(Sfio_t*),NIL(char*),(size_t)SF_UNBOUND,
                  -1,SF_WRITE|SF_STRING)) )
            return NIL(char*);

      sfseek(f,(Sfoff_t)0,SEEK_SET);
      rv = sfvprintf(f,form,args);
      va_end(args);

      if(rv < 0 || sfputc(f,'\0') < 0)
            return NIL(char*);

      _Sfi = (f->next - f->data) - 1;
      return (char*)f->data;
}

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