mdw@git.distorted.org.uk Git - mLib/blob - struct/dspool.c

   1 /* -*-c-*-
   2  *
   3  * Provide pools of strings
   4  *
   5  * (c) 1999 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the mLib utilities library.
  11  *
  12  * mLib is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * mLib is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with mLib; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include <stdio.h>
  30
  31 #include "dspool.h"
  32 #include "dstr.h"
  33 #include "sub.h"
  34
  35 /*----- Main code ---------------------------------------------------------*/
  36
  37 /* --- @dspool_create@ --- *
  38  *
  39  * Arguments:   @dspool *p@ = address of pool to create
  40  *              @size_t isz@ = initial size of new strings
  41  *
  42  * Returns:     ---
  43  *
  44  * Use:         Initializes a dynamic string pool.
  45  */
  46
  47 void dspool_create(dspool *p, size_t isz)
  48 {
  49   p->free = 0;
  50   p->isz = isz;
  51 }
  52
  53 /* --- @dspool_destroy@ --- *
  54  *
  55  * Arguments:   @dspool *p@ = pool to destroy
  56  *
  57  * Returns:     ---
  58  *
  59  * Use:         Releases all of the strings left in the pool.  Any strings
  60  *              not put back into the pool aren't freed.  However, the pool
  61  *              is still valid, and the active strings can be put back and
  62  *              released later.
  63  */
  64
  65 void dspool_destroy(dspool *p)
  66 {
  67   dspoolstr *s = p->free;
  68   while (s) {
  69     dspoolstr *n = s->next;
  70     DDESTROY(&s->ds);
  71     DESTROY(s);
  72     s = n;
  73   }
  74   p->free = 0;
  75 }
  76
  77 /* --- @dspool_get@ --- *
  78  *
  79  * Arguments:   @dspool *p@ = pointer to a string pool
  80  *
  81  * Returns:     Pointer to a dynamic string.
  82  *
  83  * Use:         Fetches a string from the pool.  The string has space for at
  84  *              least @isz@ characters (where @isz@ is the size passed to
  85  *              @dspool_create@ for the pool).
  86  */
  87
  88 dstr *dspool_get(dspool *p) { dstr *d; DSGET(p, d); return (d); }
  89
  90 /* --- @dspool_put@ --- *
  91  *
  92  * Arguments:   @dspool *p@ = pointer to a string pool
  93  *              @dstr *d@ = pointer to a dynamic string from a string pool
  94  *
  95  * Returns:     ---
  96  *
  97  * Use:         Releases a dynamic string back into a string pool.  It
  98  *              doesn't have to be the same pool the string actually came
  99  *              from, although it does have to have come from some string
 100  *              pool.
 101  */
 102
 103 void dspool_put(dspool *p, dstr *d) { DSPUT(p, d); }
 104
 105 /*----- That's all, folks -------------------------------------------------*/