mdw@git.distorted.org.uk Git - mLib/blob - selbuf.h

   1 /* -*-c-*-
   2  *
   3  * $Id: selbuf.h,v 1.5 2004/04/08 01:36:13 mdw Exp $
   4  *
   5  * Line-buffering select handler
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the mLib utilities library.
  13  *
  14  * mLib is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * mLib is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with mLib; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 #ifndef MLIB_SELBUF_H
  31 #define MLIB_SELBUF_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #ifndef MLIB_LBUF_H
  40 #  include "lbuf.h"
  41 #endif
  42
  43 #ifndef MLIB_SEL_H
  44 #  include "sel.h"
  45 #endif
  46
  47 /*----- Data structures ---------------------------------------------------*/
  48
  49 typedef struct selbuf {
  50   sel_file reader;                      /* File selection object */
  51   lbuf b;                               /* Line buffering object */
  52 } selbuf;
  53
  54 /*----- Functions provided ------------------------------------------------*/
  55
  56 /* --- @selbuf_enable@ --- *
  57  *
  58  * Arguments:   @selbuf *b@ = pointer to buffer block
  59  *
  60  * Returns:     ---
  61  *
  62  * Use:         Enables a buffer for reading, and emits any queued lines
  63  *              to the buffer's owner.
  64  */
  65
  66 extern void selbuf_enable(selbuf */*b*/);
  67
  68 /* --- @selbuf_disable@ --- *
  69  *
  70  * Arguments:   @selbuf *b@ = pointer to a buffer block
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Disables a buffer.  It won't be read from until it's
  75  *              enabled again.
  76  */
  77
  78 extern void selbuf_disable(selbuf */*b*/);
  79
  80 /* --- @selbuf_setsize@ --- *
  81  *
  82  * Arguments:   @selbuf *b@ = pointer to buffer block
  83  *              @size_t sz@ = size of buffer
  84  *
  85  * Returns:     ---
  86  *
  87  * Use:         Sets the size of the buffer used for reading lines.
  88  */
  89
  90 extern void selbuf_setsize(selbuf */*b*/, size_t /*sz*/);
  91
  92 /* --- @selbuf_init@ --- *
  93  *
  94  * Arguments:   @selbuf *b@ = pointer to buffer block
  95  *              @sel_state *s@ = pointer to select state to attach to
  96  *              @int fd@ = file descriptor to listen to
  97  *              @lbuf_func *func@ = function to call
  98  *              @void *p@ = argument for function
  99  *
 100  * Returns:     ---
 101  *
 102  * Use:         Initializes a buffer block.
 103  */
 104
 105 extern void selbuf_init(selbuf */*b*/, sel_state */*s*/, int /*fd*/,
 106                         lbuf_func */*func*/, void */*p*/);
 107
 108 /* --- @selbuf_destroy@ --- *
 109  *
 110  * Arguments:   @selbuf *b@ = pointer to buffer block
 111  *
 112  * Returns:     ---
 113  *
 114  * Use:         Deallocates a line buffer and frees any resources it owned.
 115  */
 116
 117 extern void selbuf_destroy(selbuf */*b*/);
 118
 119 /*----- That's all, folks -------------------------------------------------*/
 120
 121 #ifdef __cplusplus
 122   }
 123 #endif
 124
 125 #endif