usr.bin/make/buf.h

   1 /*      $NetBSD: buf.h,v 1.15 2009/01/17 13:29:37 dsl Exp $     */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Adam de Boor.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      from: @(#)buf.h 8.1 (Berkeley) 6/6/93
  34  */
  35
  36 /*
  37  * Copyright (c) 1988, 1989 by Adam de Boor
  38  * Copyright (c) 1989 by Berkeley Softworks
  39  * All rights reserved.
  40  *
  41  * This code is derived from software contributed to Berkeley by
  42  * Adam de Boor.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  * 3. All advertising materials mentioning features or use of this software
  53  *    must display the following acknowledgement:
  54  *      This product includes software developed by the University of
  55  *      California, Berkeley and its contributors.
  56  * 4. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  *      from: @(#)buf.h 8.1 (Berkeley) 6/6/93
  73  */
  74
  75 /*-
  76  * buf.h --
  77  *      Header for users of the buf library.
  78  */
  79
  80 #ifndef _BUF_H
  81 #define _BUF_H
  82
  83 typedef char Byte;
  84
  85 typedef struct Buffer {
  86     int     size;       /* Current size of the buffer */
  87     int     count;      /* Number of bytes in buffer */
  88     Byte    *buffer;    /* The buffer itself (zero terminated) */
  89 } Buffer;
  90
  91 /* If we aren't on netbsd, __predict_false() might not be defined. */
  92 #ifndef __predict_false
  93 #define __predict_false(x) (x)
  94 #endif
  95
  96 /* Buf_AddByte adds a single byte to a buffer. */
  97 #define Buf_AddByte(bp, byte) do { \
  98         int _count = ++(bp)->count; \
  99         char *_ptr; \
 100         if (__predict_false(_count >= (bp)->size)) \
 101                 Buf_Expand_1(bp); \
 102         _ptr = (bp)->buffer + _count; \
 103         _ptr[-1] = (byte); \
 104         _ptr[0] = 0; \
 105     } while (0)
 106
 107 #define BUF_ERROR 256
 108
 109 #define Buf_Size(bp) ((bp)->count)
 110
 111 void Buf_Expand_1(Buffer *);
 112 void Buf_AddBytes(Buffer *, int, const Byte *);
 113 Byte *Buf_GetAll(Buffer *, int *);
 114 void Buf_Empty(Buffer *);
 115 void Buf_Init(Buffer *, int);
 116 Byte *Buf_Destroy(Buffer *, Boolean);
 117
 118 #endif /* _BUF_H */