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mirror of https://git.FreeBSD.org/src.git synced 2024-12-22 11:17:19 +00:00
freebsd/usr.bin/make/buf.c
2011-12-30 11:02:40 +00:00

292 lines
5.9 KiB
C

/*-
* Copyright (c) 2005 Max Okumoto
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)buf.c 8.1 (Berkeley) 6/6/93
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* buf.c
* Functions for automatically-expanded buffers.
*/
#include <string.h>
#include <stdlib.h>
#include "buf.h"
#include "util.h"
/**
* Returns the number of bytes in the buffer. Doesn't include the
* null-terminating byte.
*/
size_t
Buf_Size(const Buffer *buf)
{
return (buf->end - buf->buf);
}
/**
* Returns a reference to the data contained in the buffer.
*
* @note Adding data to the Buffer object may invalidate the reference.
*/
char *
Buf_Data(const Buffer *bp)
{
return (bp->buf);
}
/**
* Expand the buffer to hold the number of additional bytes, plus
* space to store a terminating NULL byte.
*/
static inline void
BufExpand(Buffer *bp, size_t nb)
{
size_t len = Buf_Size(bp);
size_t size;
if (bp->size < len + nb + 1) {
size = bp->size + MAX(nb + 1, BUF_ADD_INC);
bp->size = size;
bp->buf = erealloc(bp->buf, size);
bp->end = bp->buf + len;
}
}
/**
* Add a single byte to the buffer.
*/
void
Buf_AddByte(Buffer *bp, Byte byte)
{
BufExpand(bp, 1);
*bp->end = byte;
bp->end++;
*bp->end = '\0';
}
/**
* Add bytes to the buffer.
*/
void
Buf_AddBytes(Buffer *bp, size_t len, const Byte *bytes)
{
BufExpand(bp, len);
memcpy(bp->end, bytes, len);
bp->end += len;
*bp->end = '\0';
}
/**
* Get a reference to the internal buffer.
*
* len:
* Pointer to where we return the number of bytes in the internal buffer.
*
* Returns:
* return A pointer to the data.
*/
Byte *
Buf_GetAll(Buffer *bp, size_t *len)
{
if (len != NULL)
*len = Buf_Size(bp);
return (bp->buf);
}
/**
* Get the contents of a buffer and destroy the buffer. If the buffer
* is NULL, return NULL.
*
* Returns:
* the pointer to the data.
*/
char *
Buf_Peel(Buffer *bp)
{
char *ret;
if (bp == NULL)
return (NULL);
ret = bp->buf;
free(bp);
return (ret);
}
/**
* Initialize a buffer. If no initial size is given, a reasonable
* default is used.
*
* Returns:
* A buffer object to be given to other functions in this library.
*
* Side Effects:
* Space is allocated for the Buffer object and a internal buffer.
*/
Buffer *
Buf_Init(size_t size)
{
Buffer *bp; /* New Buffer */
if (size <= 0)
size = BUF_DEF_SIZE;
bp = emalloc(sizeof(*bp));
bp->size = size;
bp->buf = emalloc(size);
bp->end = bp->buf;
*bp->end = '\0';
return (bp);
}
/**
* Destroy a buffer, and optionally free its data, too.
*
* Side Effects:
* Space for the Buffer object and possibly the internal buffer
* is de-allocated.
*/
void
Buf_Destroy(Buffer *buf, Boolean freeData)
{
if (freeData)
free(buf->buf);
free(buf);
}
/**
* Replace the last byte in a buffer. If the buffer was empty
* initially, then a new byte will be added.
*/
void
Buf_ReplaceLastByte(Buffer *bp, Byte byte)
{
if (bp->end == bp->buf) {
Buf_AddByte(bp, byte);
} else {
*(bp->end - 1) = byte;
}
}
/**
* Append characters in str to Buffer object
*/
void
Buf_Append(Buffer *bp, const char str[])
{
Buf_AddBytes(bp, strlen(str), str);
}
/**
* Append characters in buf to Buffer object
*/
void
Buf_AppendBuf(Buffer *bp, const Buffer *buf)
{
Buf_AddBytes(bp, Buf_Size(buf), buf->buf);
}
/**
* Append characters between str and end to Buffer object.
*/
void
Buf_AppendRange(Buffer *bp, const char str[], const char *end)
{
Buf_AddBytes(bp, end - str, str);
}
/**
* Convert newlines in buffer to spaces. The trailing newline is
* removed.
*/
void
Buf_StripNewlines(Buffer *bp)
{
char *ptr = bp->end;
/*
* If there is anything in the buffer, remove the last
* newline character.
*/
if (ptr != bp->buf) {
if (*(ptr - 1) == '\n') {
/* shorten buffer */
*(ptr - 1) = '\0';
--bp->end;
}
--ptr;
}
/* Convert newline characters to a space characters. */
while (ptr != bp->buf) {
if (*ptr == '\n') {
*ptr = ' ';
}
--ptr;
}
}
/**
* Clear the contents of the buffer.
*/
void
Buf_Clear(Buffer *bp)
{
bp->end = bp->buf;
*bp->end = '\0';
}