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fmtbuf.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>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

/*
 * return small format buffer chunk of size n
 * spin lock for thread access
 * format buffers are short lived
 * only one concurrent buffer with size > sizeof(buf)
 */

static char       buf[16 * 1024];
static char*            nxt = buf;
static int        lck = -1;

static char*            big;
static size_t           bigsiz;

char*
fmtbuf(size_t n)
{
      register char*    cur;

      while (++lck)
            lck--;
      if (n > (&buf[elementsof(buf)] - nxt))
      {
            if (n > elementsof(buf))
            {
                  if (n > bigsiz)
                  {
                        bigsiz = roundof(n, 8 * 1024);
                        if (!(big = newof(big, char, bigsiz, 0)))
                        {
                              lck--;
                              return 0;
                        }
                  }
                  lck--;
                  return big;
            }
            nxt = buf;
      }
      cur = nxt;
      nxt += n;
      lck--;
      return cur;
}

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