GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/make/buf.c Lines: 18 25 72.0 %
Date: 2017-11-13 Branches: 9 16 56.3 %

Line Branch Exec Source
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/*	$OpenBSD: buf.c,v 1.27 2015/04/29 00:42:12 millert Exp $	*/
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/*	$NetBSD: buf.c,v 1.9 1996/12/31 17:53:21 christos Exp $ */
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/*
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 * Copyright (c) 1999 Marc Espie.
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 *
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 * Extensive code changes for the OpenBSD project.
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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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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
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 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
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 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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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. 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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/*-
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 * buf.c --
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 *	Functions for automatically expanded buffers.
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 */
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#include <ctype.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include "config.h"
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#include "defines.h"
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#include "buf.h"
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#include "stats.h"
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#include "memory.h"
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#ifdef STATS_BUF
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#define DO_STAT_BUF(bp, nb)					\
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	STAT_BUFS_EXPANSION++;			\
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	if ((bp)->endPtr - (bp)->buffer == 1)			\
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		STAT_WEIRD_INEFFICIENT++;
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#else
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#define DO_STAT_BUF(a, b)
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#endif
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static void
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fatal_overflow()
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{
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	fprintf(stderr, "buffer size overflow\n");
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	exit(2);
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}
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/* BufExpand(bp, nb)
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 *	Expand buffer bp to hold upto nb additional
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 *	chars.	Makes sure there's room for an extra '\0' char at
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 *	the end of the buffer to terminate the string.	*/
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#define BufExpand(bp,nb)				\
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do {							\
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	size_t   occupied = (bp)->inPtr - (bp)->buffer;	\
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	size_t   size = (bp)->endPtr - (bp)->buffer;	\
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	DO_STAT_BUF(bp, nb);				\
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							\
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	do {						\
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		if (size <= SIZE_MAX/2) {		\
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			size *= 2 ;			\
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		} else {				\
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			fatal_overflow();		\
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		}					\
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	} while (size - occupied < (nb)+1+BUF_MARGIN);	\
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	(bp)->buffer = (bp)->inPtr = (bp)->endPtr = 	\
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		erealloc((bp)->buffer, size);		\
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	(bp)->inPtr += occupied;			\
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	(bp)->endPtr += size;				\
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} while (0);
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#define BUF_DEF_SIZE	256	/* Default buffer size */
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#define BUF_MARGIN	256	/* Make sure we are comfortable */
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/* the hard case for Buf_AddChar: buffer must be expanded to accommodate
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 * one more char.  */
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void
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BufOverflow(Buffer bp)
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{
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	BufExpand(bp, 1);
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}
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void
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Buf_AddChars(Buffer bp, size_t numBytes, const char *bytesPtr)
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{
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	if ((size_t)(bp->endPtr - bp->inPtr) < numBytes+1)
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		BufExpand(bp, numBytes);
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	memcpy(bp->inPtr, bytesPtr, numBytes);
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	bp->inPtr += numBytes;
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}
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void
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Buf_printf(Buffer bp, const char *fmt, ...)
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{
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	va_list va;
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	int n;
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	va_start(va, fmt);
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	n = vsnprintf(bp->inPtr, bp->endPtr - bp->inPtr, fmt, va);
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	va_end(va);
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	if (n > bp->endPtr - bp->inPtr) {
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		va_list vb;
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		BufExpand(bp, n);
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		va_start(vb, fmt);
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		(void)vsnprintf(bp->inPtr, bp->endPtr - bp->inPtr, fmt, vb);
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		va_end(vb);
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	}
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	bp->inPtr += n;
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}
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void
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Buf_Init(Buffer bp, size_t size)
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{
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#ifdef STATS_BUF
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	STAT_TOTAL_BUFS++;
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	if (size == 0)
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		STAT_DEFAULT_BUFS++;
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	if (size == 1)
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		STAT_WEIRD_BUFS++;
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#endif
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	if (size == 0)
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		size = BUF_DEF_SIZE;
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	bp->inPtr = bp->endPtr = bp->buffer = emalloc(size);
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	bp->endPtr += size;
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}