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#ifndef _BUF_H
#define _BUF_H
/* $OpenBSD: buf.h,v 1.24 2020/01/13 13:54:44 espie Exp $ */
/* $NetBSD: buf.h,v 1.7 1996/12/31 17:53:22 christos Exp $ */
/*
* Copyright (c) 1999 Marc Espie.
*
* Extensive code changes for the OpenBSD project.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
* PROJECT 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.
*/
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* 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.
*
* from: @(#)buf.h 8.1 (Berkeley) 6/6/93
*/
/*
* buf
* Support for extensible char buffers.
* One adds chars to a buffer, then retrieves the contents using
* Buf_Retrieve (no copy involved), or releases the memory using
* Buf_Destroy.
*/
/* Internal data structures and functions. BUFFER is visible so
* that users can allocate the memory themselves. */
typedef struct Buffer_ {
char *buffer; /* The buffer itself. */
char *inPtr; /* Place to write to. */
char *endPtr; /* End of allocated space. */
} BUFFER;
/* Internal support for Buf_AddChar. */
extern void BufExpand(Buffer, size_t);
/* User interface */
/* Buf_AddChars(buf, n, str);
* Adds n chars to buffer buf starting from str. */
extern void Buf_AddChars(Buffer, size_t, const char *);
/* Buf_Truncate(buffer, length) */
#define Buf_Truncate(bp, len) ((void)((bp)->inPtr = (bp)->buffer + (len)))
/* Buf_Reset(buf);
* Empties buffer. */
#define Buf_Reset(bp) Buf_Truncate(bp, 0)
/* n = Buf_Size(buf);
* Returns number of chars currently in buf.
* Doesn't include the null-terminating char. */
#define Buf_Size(bp) ((size_t)((bp)->inPtr - (bp)->buffer))
/* Buf_Init(buf, init);
* Initializes a buffer, to hold approximately init chars.
* Set init to 0 if you have no idea. */
extern void Buf_Init(Buffer, size_t);
/* Buf_Reinit(buf, init);
* Initializes/reset a static buffer */
extern void Buf_Reinit(Buffer, size_t);
/* Buf_Destroy(buf);
* Nukes a buffer and all its resources. */
#define Buf_Destroy(bp) ((void)free((bp)->buffer))
/* str = Buf_Retrieve(buf);
* Retrieves data from a buffer, as a NULL terminated string. */
#define Buf_Retrieve(bp) (*(bp)->inPtr = '\0', (bp)->buffer)
/* Buf_AddChar(buf, c);
* Adds a single char to buffer. */
#define Buf_AddChar(bp, byte) \
do { \
if ((bp)->endPtr - (bp)->inPtr <= 1) \
BufExpand(bp, 1); \
*(bp)->inPtr++ = (byte); \
} while (0)
/* Buf_AddSpace(buf);
* Adds a space to buffer. */
#define Buf_AddSpace(b) Buf_AddChar((b), ' ')
/* Buf_AddString(buf, str);
* Adds the contents of a NULL terminated string to buffer. */
#define Buf_AddString(b, s) Buf_AddChars((b), strlen(s), (s))
/* Buf_Addi(buf, s, e);
* Adds characters between s and e to buffer. */
#define Buf_Addi(b, s, e) Buf_AddChars((b), (e) - (s), (s))
extern void Buf_printf(Buffer, const char *, ...);
#define Buf_puts(b, s) Buf_AddChars((b), strlen(s), (s))
#endif /* _BUF_H */
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