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strings.c

/*    $OpenBSD: strings.c,v 1.8 2003/06/03 02:56:11 millert Exp $ */
/*    $NetBSD: strings.c,v 1.5 1996/06/08 19:48:40 christos Exp $ */

/*
 * Copyright (c) 1980, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)strings.c     8.1 (Berkeley) 6/6/93";
#else
static const char rcsid[] = "$OpenBSD: strings.c,v 1.8 2003/06/03 02:56:11 millert Exp $";
#endif
#endif /* not lint */

/*
 * Mail -- a mail program
 *
 * String allocation routines.
 * Strings handed out here are reclaimed at the top of the command
 * loop each time, so they need not be freed.
 */

#include "rcv.h"
#include "extern.h"

/*
 * Allocate size more bytes of space and return the address of the
 * first byte to the caller.  An even number of bytes are always
 * allocated so that the space will always be on a word boundary.
 * The string spaces are of exponentially increasing size, to satisfy
 * the occasional user with enormous string size requests.
 */
char *
salloc(int size)
{
      char *t;
      int s;
      struct strings *sp;
      int index;

      s = size;
      s += (sizeof(char *) - 1);
      s &= ~(sizeof(char *) - 1);
      index = 0;
      for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
            if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s)
                  break;
            if (sp->s_nleft >= s)
                  break;
            index++;
      }
      if (sp >= &stringdope[NSPACE])
            errx(1, "String too large");
      if (sp->s_topFree == NULL) {
            index = sp - &stringdope[0];
            sp->s_topFree = (char *)malloc(STRINGSIZE << index);
            if (sp->s_topFree == NULL)
                  errx(1, "No room for space %d", index);
            sp->s_nextFree = sp->s_topFree;
            sp->s_nleft = STRINGSIZE << index;
      }
      sp->s_nleft -= s;
      t = sp->s_nextFree;
      sp->s_nextFree += s;
      return(t);
}

/*
 * Reset the string area to be empty.
 * Called to free all strings allocated
 * since last reset.
 */
void
sreset(void)
{
      struct strings *sp;
      int index;

      if (noreset)
            return;
      index = 0;
      for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
            if (sp->s_topFree == NULL)
                  continue;
            sp->s_nextFree = sp->s_topFree;
            sp->s_nleft = STRINGSIZE << index;
            index++;
      }
}

/*
 * Make the string area permanent.
 * Meant to be called in main, after initialization.
 */
void
spreserve(void)
{
      struct strings *sp;

      for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++)
            sp->s_topFree = NULL;
}

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