292 lines
6.0 KiB
C
292 lines
6.0 KiB
C
/*-
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* Copyright (c) 2005 Max Okumoto
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)buf.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* buf.c
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* Functions for automatically-expanded buffers.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "buf.h"
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#include "util.h"
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/**
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* Returns the number of bytes in the buffer. Doesn't include the
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* null-terminating byte.
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*/
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inline size_t
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Buf_Size(const Buffer *buf)
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{
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return (buf->end - buf->buf);
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}
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/**
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* Returns a reference to the data contained in the buffer.
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*
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* @note Adding data to the Buffer object may invalidate the reference.
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*/
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inline char *
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Buf_Data(const Buffer *bp)
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{
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return (bp->buf);
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}
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/**
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* Expand the buffer to hold the number of additional bytes, plus
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* space to store a terminating NULL byte.
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*/
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static inline void
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BufExpand(Buffer *bp, size_t nb)
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{
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size_t len = Buf_Size(bp);
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size_t size;
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if (bp->size < len + nb + 1) {
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size = bp->size + MAX(nb + 1, BUF_ADD_INC);
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bp->size = size;
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bp->buf = erealloc(bp->buf, size);
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bp->end = bp->buf + len;
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}
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}
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/**
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* Add a single byte to the buffer.
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*/
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inline void
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Buf_AddByte(Buffer *bp, Byte byte)
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{
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BufExpand(bp, 1);
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*bp->end = byte;
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bp->end++;
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*bp->end = '\0';
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}
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/**
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* Add bytes to the buffer.
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*/
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void
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Buf_AddBytes(Buffer *bp, size_t len, const Byte *bytes)
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{
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BufExpand(bp, len);
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memcpy(bp->end, bytes, len);
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bp->end += len;
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*bp->end = '\0';
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}
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/**
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* Get a reference to the internal buffer.
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*
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* len:
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* Pointer to where we return the number of bytes in the internal buffer.
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*
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* Returns:
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* return A pointer to the data.
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*/
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Byte *
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Buf_GetAll(Buffer *bp, size_t *len)
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{
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if (len != NULL)
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*len = Buf_Size(bp);
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return (bp->buf);
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}
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/**
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* Get the contents of a buffer and destroy the buffer. If the buffer
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* is NULL, return NULL.
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*
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* Returns:
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* the pointer to the data.
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*/
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char *
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Buf_Peel(Buffer *bp)
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{
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char *ret;
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if (bp == NULL)
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return (NULL);
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ret = bp->buf;
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free(bp);
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return (ret);
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}
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/**
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* Initialize a buffer. If no initial size is given, a reasonable
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* default is used.
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*
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* Returns:
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* A buffer object to be given to other functions in this library.
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*
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* Side Effects:
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* Space is allocated for the Buffer object and a internal buffer.
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*/
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Buffer *
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Buf_Init(size_t size)
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{
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Buffer *bp; /* New Buffer */
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if (size <= 0)
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size = BUF_DEF_SIZE;
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bp = emalloc(sizeof(*bp));
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bp->size = size;
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bp->buf = emalloc(size);
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bp->end = bp->buf;
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*bp->end = '\0';
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return (bp);
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}
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/**
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* Destroy a buffer, and optionally free its data, too.
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*
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* Side Effects:
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* Space for the Buffer object and possibly the internal buffer
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* is de-allocated.
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*/
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void
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Buf_Destroy(Buffer *buf, Boolean freeData)
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{
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if (freeData)
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free(buf->buf);
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free(buf);
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}
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/**
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* Replace the last byte in a buffer. If the buffer was empty
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* intially, then a new byte will be added.
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*/
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void
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Buf_ReplaceLastByte(Buffer *bp, Byte byte)
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{
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if (bp->end == bp->buf) {
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Buf_AddByte(bp, byte);
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} else {
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*(bp->end - 1) = byte;
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}
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}
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/**
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* Append characters in str to Buffer object
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*/
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void
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Buf_Append(Buffer *bp, const char str[])
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{
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Buf_AddBytes(bp, strlen(str), str);
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}
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/**
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* Append characters in buf to Buffer object
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*/
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void
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Buf_AppendBuf(Buffer *bp, const Buffer *buf)
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{
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Buf_AddBytes(bp, Buf_Size(buf), buf->buf);
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}
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/**
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* Append characters between str and end to Buffer object.
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*/
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void
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Buf_AppendRange(Buffer *bp, const char str[], const char *end)
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{
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Buf_AddBytes(bp, end - str, str);
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}
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/**
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* Convert newlines in buffer to spaces. The trailing newline is
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* removed.
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*/
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void
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Buf_StripNewlines(Buffer *bp)
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{
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char *ptr = bp->end;
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/*
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* If there is anything in the buffer, remove the last
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* newline character.
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*/
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if (ptr != bp->buf) {
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if (*(ptr - 1) == '\n') {
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/* shorten buffer */
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*(ptr - 1) = '\0';
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--bp->end;
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}
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--ptr;
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}
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/* Convert newline characters to a space characters. */
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while (ptr != bp->buf) {
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if (*ptr == '\n') {
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*ptr = ' ';
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}
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--ptr;
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}
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}
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/**
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* Clear the contents of the buffer.
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*/
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void
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Buf_Clear(Buffer *bp)
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{
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bp->end = bp->buf;
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*bp->end = '\0';
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}
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