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_sfputm.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                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"

/*    Write out an unsigned long value in a portable format.
**
**    Written by Kiem-Phong Vo.
*/

#if __STD_C
int _sfputm(Sfio_t* f, Sfulong_t v, Sfulong_t m)
#else
int _sfputm(f,v,m)
Sfio_t*           f;    /* write a portable ulong to this stream */
Sfulong_t   v;    /* the unsigned value to be written */
Sfulong_t   m;    /* the max value of the range */
#endif
{
#define N_ARRAY         (2*sizeof(Sfulong_t))
      reg uchar   *s, *ps;
      reg ssize_t n, p;
      uchar       c[N_ARRAY];
      SFMTXDECL(f);

      SFMTXENTER(f, -1);

      if(v > m || (f->mode != SF_WRITE && _sfmode(f,SF_WRITE,0) < 0) )
            SFMTXRETURN(f, -1);
      SFLOCK(f,0);

      /* code v as integers in base SF_UBASE */
      s = ps = &(c[N_ARRAY-1]);
      *s = (uchar)SFBVALUE(v);
      while((m >>= SF_BBITS) > 0 )
      {     v >>= SF_BBITS;
            *--s = (uchar)SFBVALUE(v);
      }
      n = (ps-s)+1;

      if(n > 8 || SFWPEEK(f,ps,p) < n)
            n = SFWRITE(f,(Void_t*)s,n); /* write the hard way */
      else
      {     switch(n)
            {
            case 8 : *ps++ = *s++;
            case 7 : *ps++ = *s++;
            case 6 : *ps++ = *s++;
            case 5 : *ps++ = *s++;
            case 4 : *ps++ = *s++;
            case 3 : *ps++ = *s++;
            case 2 : *ps++ = *s++;
            case 1 : *ps++ = *s++;
            }
            f->next = ps;
      }

      SFOPEN(f,0);
      SFMTXRETURN(f, (int)n);
}

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