string.c

来自「早期freebsd实现」· C语言 代码 · 共 180 行

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)string.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include "whoami.h"
#include "align.h"
#include "0.h"
#ifndef PI01
#ifndef PXP
#include "send.h"
#endif
#endif

/*
 * STRING SPACE DECLARATIONS
 *
 * Strng is the base of the current
 * string space and strngp the
 * base of the free area therein.
 * Strp is the array of descriptors.
 */
#ifndef PI0
STATIC	char strings[STRINC];
STATIC	char *strng = strings;
STATIC	char *strngp = strings;
#else
char	*strng, *strngp;
#endif
#ifndef PI01
#ifndef PXP
STATIC	char *strp[20];
STATIC	char **stract strp;
int	strmax;
#endif
#endif

#ifndef PI01
#ifndef PXP
#ifndef PI0
initstring()
#else
initstring(strings)
	char *strings;
#endif
{

	*stract++ = strings;
#ifdef PI0
	strng = strngp = strings;
#endif
	strmax = STRINC * 2;
}
#endif
#endif

/*
 * Copy a string into the string area.
 */
char *
savestr(cp)
	register char *cp;
{
	register int i;

	i = strlen(cp) + 1;
	if (strngp + i >= strng + STRINC) {
		strngp = malloc(STRINC);
		if (strngp == 0) {
			yerror("Ran out of memory (string)");
			pexit(DIED);
		}
#ifndef PI01
#ifndef PXP
		*stract++ = strngp;
		strmax += STRINC;
#endif
#endif
		strng = strngp;
	}
	(void) pstrcpy(strngp, cp);
	cp = strngp;
	strngp = cp + i;
#ifdef PI0
	send(RSTRING, cp);
#endif
	return (cp);
}

#ifndef PI1
#ifndef PXP
char *
esavestr(cp)
	char *cp;
{

#ifdef PI0
	send(REVENIT);
#endif
	strngp = ( (char *) roundup( strngp, A_LONG ) );
	return (savestr(cp));
}
#endif
#endif

#ifndef PI01
#ifndef PXP
soffset(cp)
	register char *cp;
{
	register char **sp;
	register int i;

	if (cp == NIL || cp == OCT || cp == HEX)
		return (-cp);
	for (i = STRINC, sp = strp; sp < stract; sp++) {
		if (cp >= *sp && cp < (*sp + STRINC))
			return (i + (cp - *sp));
		i += STRINC;
	}
	i = nlfund(cp);
	if (i != 0)
		return (i);
	panic("soffset");
}
#ifdef PI1
sreloc(i)
	register int i;
{

	if (i == 0 || i == -OCT || i == -HEX)
		return (-i);
	if (i < STRINC) {
		if (i >= INL)
			panic("sreloc INL");
		i = nl[i].symbol;
		if (i == 0)
			panic("sreloc nl[i]");
		return (i);
	}
	if (i > strmax || i < 0)
		panic("sreloc");
	return (strp[(i / STRINC) - 1] + (i % STRINC));
}
#endif
#endif
#endif