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sfnputc.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 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 a character n times
**
**    Written by Kiem-Phong Vo.
*/

#if __STD_C
ssize_t sfnputc(Sfio_t* f, int c, size_t n)
#else
ssize_t sfnputc(f,c,n)
Sfio_t*           f;    /* file to write */
int         c;    /* char to be written */
size_t            n;    /* number of time to repeat */
#endif
{
      reg uchar*  ps;
      reg ssize_t p, w;
      uchar       buf[128];
      reg int           local;
      SFMTXDECL(f);

      SFMTXENTER(f,-1);

      GETLOCAL(f,local);
      if(SFMODE(f,local) != SF_WRITE && _sfmode(f,SF_WRITE,local) < 0)
            SFMTXRETURN(f, -1);

      SFLOCK(f,local);

      /* write into a suitable buffer */
      if((size_t)(p = (f->endb-(ps = f->next))) < n)
            { ps = buf; p = sizeof(buf); }
      if((size_t)p > n)
            p = n;
      MEMSET(ps,c,p);
      ps -= p;

      w = n;
      if(ps == f->next)
      {     /* simple sfwrite */
            f->next += p;
            if(c == '\n')
                  (void)SFFLSBUF(f,-1);
            goto done;
      }

      for(;;)
      {     /* hard write of data */
            if((p = SFWRITE(f,(Void_t*)ps,p)) <= 0 || (n -= p) <= 0)
            {     w -= n;
                  goto done;
            }
            if((size_t)p > n)
                  p = n;
      }
done :
      SFOPEN(f,local);
      SFMTXRETURN(f, w);
}

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