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

   1 /* -*-c-*-
   2  *
   3  * Line-buffering select handler
   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
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef MLIB_SELBUF_H
  29 #define MLIB_SELBUF_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #ifndef MLIB_LBUF_H
  38 #  include "lbuf.h"
  39 #endif
  40
  41 #ifndef MLIB_SEL_H
  42 #  include "sel.h"
  43 #endif
  44
  45 /*----- Data structures ---------------------------------------------------*/
  46
  47 typedef struct selbuf {
  48   sel_file reader;                      /* File selection object */
  49   lbuf b;                               /* Line buffering object */
  50 } selbuf;
  51
  52 /*----- Functions provided ------------------------------------------------*/
  53
  54 /* --- @selbuf_enable@ --- *
  55  *
  56  * Arguments:   @selbuf *b@ = pointer to buffer block
  57  *
  58  * Returns:     ---
  59  *
  60  * Use:         Enables a buffer for reading, and emits any queued lines
  61  *              to the buffer's owner.
  62  */
  63
  64 extern void selbuf_enable(selbuf */*b*/);
  65
  66 /* --- @selbuf_disable@ --- *
  67  *
  68  * Arguments:   @selbuf *b@ = pointer to a buffer block
  69  *
  70  * Returns:     ---
  71  *
  72  * Use:         Disables a buffer.  It won't be read from until it's
  73  *              enabled again.
  74  */
  75
  76 extern void selbuf_disable(selbuf */*b*/);
  77
  78 /* --- @selbuf_setsize@ --- *
  79  *
  80  * Arguments:   @selbuf *b@ = pointer to buffer block
  81  *              @size_t sz@ = size of buffer
  82  *
  83  * Returns:     ---
  84  *
  85  * Use:         Sets the size of the buffer used for reading lines.
  86  */
  87
  88 extern void selbuf_setsize(selbuf */*b*/, size_t /*sz*/);
  89
  90 /* --- @selbuf_init@ --- *
  91  *
  92  * Arguments:   @selbuf *b@ = pointer to buffer block
  93  *              @sel_state *s@ = pointer to select state to attach to
  94  *              @int fd@ = file descriptor to listen to
  95  *              @lbuf_func *func@ = function to call
  96  *              @void *p@ = argument for function
  97  *
  98  * Returns:     ---
  99  *
 100  * Use:         Initializes a buffer block.
 101  */
 102
 103 extern void selbuf_init(selbuf */*b*/, sel_state */*s*/, int /*fd*/,
 104                         lbuf_func */*func*/, void */*p*/);
 105
 106 /* --- @selbuf_destroy@ --- *
 107  *
 108  * Arguments:   @selbuf *b@ = pointer to buffer block
 109  *
 110  * Returns:     ---
 111  *
 112  * Use:         Deallocates a line buffer and frees any resources it owned.
 113  */
 114
 115 extern void selbuf_destroy(selbuf */*b*/);
 116
 117 /*----- That's all, folks -------------------------------------------------*/
 118
 119 #ifdef __cplusplus
 120   }
 121 #endif
 122
 123 #endif