view utils.c @ 203:3a25180d3a5c

Abort on line numbering or column numbering overflow. Line numbers are limited to values that fit in "unsigned int". Also reject input lines longer than 2^32-1 characters. It seems reasonable to presume that any input that violates these constraints is someone screwing around and not a serious attempt to compile or preprocess anything useful. Done in response to n2129, but without getting into any of the silliness found there.
author David A. Holland
date Tue, 01 Aug 2017 14:51:04 -0400
parents 4ea0ce804d22
children
line wrap: on
line source

/*-
 * Copyright (c) 2010, 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by David A. Holland.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "utils.h"

#define MALLOCDEBUG

const char ws[] =
	" \t\f\v"
;
const char alnum[] = 
	"0123456789"
	"abcdefghijklmnopqrstuvwxyz"
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	"_"
;

////////////////////////////////////////////////////////////
// malloc

#define ROUNDUP(len, size) ((size) * (((len) + (size) - 1) / (size)))

#ifdef MALLOCDEBUG

struct mallocheader {
	struct mallocheader *self;
	size_t len;
};

static
size_t
adjustsize(size_t len)
{
	const size_t sz = sizeof(struct mallocheader);
	return ROUNDUP(len, sz) + 2*sz;
}

static
void *
placeheaders(void *block, size_t len)
{
	struct mallocheader *bothdr, *tophdr;
	size_t roundedlen;
	void *ret;

	roundedlen = ROUNDUP(len, sizeof(struct mallocheader));
	bothdr = block;
	bothdr->len = len;
	bothdr->self = block;
	ret = bothdr + 1;
	tophdr = (void *)(((unsigned char *)ret) + roundedlen);
	tophdr->len = len;
	tophdr->self = bothdr;
	return ret;
}

static
void *
checkheaders(void *block, size_t len)
{
	struct mallocheader *bothdr, *tophdr;
	size_t roundedlen;

	if (block == NULL) {
		assert(len == 0);
		return block;
	}

	roundedlen = ROUNDUP(len, sizeof(struct mallocheader));
	bothdr = block;
	bothdr--;
	assert(bothdr->self == bothdr);
	assert(bothdr->len == len);
	tophdr = (void *)(((unsigned char *)(bothdr + 1)) + roundedlen);
	assert(tophdr->self == bothdr);
	assert(tophdr->len == len);
	return bothdr;
}

#else

#define adjustsize(len) (len)
#define placeheaders(block, len) ((void)(len), (block))
#define checkheaders(ptr, len) ((void)(len), (ptr))

#endif /* MALLOCDEBUG */

void *
domalloc(size_t len)
{
	void *ret;
	size_t blocklen;

	blocklen = adjustsize(len);
	ret = malloc(blocklen);
	if (ret == NULL) {
		complain(NULL, "Out of memory");
		die();
	}

	return placeheaders(ret, len);
}

void *
dorealloc(void *ptr, size_t oldlen, size_t newlen)
{
	void *ret;
	void *blockptr;
	size_t newblocklen;

	blockptr = checkheaders(ptr, oldlen);
	newblocklen = adjustsize(newlen);

	ret = realloc(blockptr, newblocklen);
	if (ret == NULL) {
		complain(NULL, "Out of memory");
		die();
	}

	return placeheaders(ret, newlen);
}

void
dofree(void *ptr, size_t len)
{
	void *blockptr;

	blockptr = checkheaders(ptr, len);
	free(blockptr);
}

////////////////////////////////////////////////////////////
// string allocators

char *
dostrdup(const char *s)
{
	char *ret;
	size_t len;

	len = strlen(s);
	ret = domalloc(len+1);
	strcpy(ret, s);
	return ret;
}

char *
dostrdup2(const char *s, const char *t)
{
	char *ret;
	size_t len;

	len = strlen(s) + strlen(t);
	ret = domalloc(len+1);
	strcpy(ret, s);
	strcat(ret, t);
	return ret;
}

char *
dostrdup3(const char *s, const char *t, const char *u)
{
	char *ret;
	size_t len;

	len = strlen(s) + strlen(t) + strlen(u);
	ret = domalloc(len+1);
	strcpy(ret, s);
	strcat(ret, t);
	strcat(ret, u);
	return ret;
}

char *
dostrndup(const char *s, size_t len)
{
	char *ret;

	ret = domalloc(len+1);
	memcpy(ret, s, len);
	ret[len] = '\0';
	return ret;
}

void
dostrfree(char *s)
{
	dofree(s, strlen(s)+1);
}

////////////////////////////////////////////////////////////
// other stuff

size_t
notrailingws(char *buf, size_t len)
{
	while (len > 0 && strchr(ws, buf[len-1])) {
		buf[--len] = '\0';
	}
	return len;
}

bool
is_identifier(const char *str)
{
	size_t len;

	len = strlen(str);
	if (len != strspn(str, alnum)) {
		return false;
	}
	if (str[0] >= '0' && str[0] <= '9') {
		return false;
	}
	return true;
}