freebsd/sys/dev/vinum/vinumparser.c

/*-
 * Copyright (c) 1997, 1998
 *	Nan Yang Computer Services Limited.  All rights reserved.
 *
 *  This software is distributed under the so-called ``Berkeley
 *  License'':
 *
 * 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 Nan Yang Computer
 *      Services Limited.
 * 4. Neither the name of the Company 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 ``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 company 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.
 *
 * $Id: parser.c,v 1.3 1998/12/28 04:56:23 peter Exp $
 */

/* This file contains the parser for the configuration routines.  It's used
 * both in the kernel and in the user interface program, thus the separate file. */

/* Go through a text and split up into text tokens.  These are either non-blank
 * sequences, or any sequence (except \0) enclosed in ' or ".  Embedded ' or
 * " characters may be escaped by \, which otherwise has no special meaning.
 *
 * Delimit by following with a \0, and return pointers to the starts at token [].
 * Return the number of tokens found as the return value.
 *
 * This method has the restriction that a closing " or ' must be followed by
 * grey space.
 *
 * Error conditions are end of line before end of quote, or no space after
 * a closing quote.  In this case, tokenize() returns -1. */

#ifdef KERNEL
#include "opt_vinum.h"
#endif

#include <sys/param.h>
#ifdef KERNEL
#undef KERNEL						    /* XXX */
#define REALLYKERNEL
#else
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#endif
/* All this mess for a single struct definition */
#include <sys/uio.h>
#include <sys/namei.h>
#include <sys/disklabel.h>
#include <sys/mount.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/buf.h>

#include <dev/vinum/vinumvar.h>
#include <dev/vinum/vinumkw.h>
#include <dev/vinum/vinumio.h>
#include <dev/vinum/vinumext.h>

#ifdef REALLYKERNEL
#define isspace(c) ((c == ' ') || (c == '\t'))		    /* check for white space */
#else /* get it from the headers */
#include <ctype.h>
#endif

/* enum keyword is defined in vinumvar.h */

#define keypair(x) { #x, kw_##x }			    /* create pair "foo", kw_foo */
#define flagkeypair(x) { "-"#x, kw_##x }		    /* create pair "-foo", kw_foo */
#define KEYWORDSET(x) {sizeof (x) / sizeof (struct _keywords), x}

/* Normal keywords.  These are all the words that vinum knows. */
struct _keywords keywords[] =
{keypair(drive),
    keypair(sd),
    keypair(subdisk),
    keypair(plex),
    keypair(volume),
    keypair(vol),
    keypair(setupstate),
    keypair(readpol),
    keypair(org),
    keypair(name),
    keypair(writethrough),
    keypair(writeback),
    keypair(raw),
    keypair(device),
    keypair(concat),
    keypair(raid5),
    keypair(striped),
    keypair(plexoffset),
    keypair(driveoffset),
    keypair(length),
    keypair(len),
    keypair(state),
    keypair(round),
    keypair(prefer),
    keypair(rename),
    keypair(detached),
#ifndef KERNEL						    /* for vinum(8) only */
#ifdef VINUMDEBUG
    keypair(debug),
#endif
    keypair(attach),
    keypair(detach),
    keypair(printconfig),
    keypair(replace),
    keypair(create),
    keypair(read),
    keypair(modify),
    keypair(list),
    keypair(l),
    keypair(ld),
    keypair(ls),
    keypair(lp),
    keypair(lv),
    keypair(info),
    keypair(set),
    keypair(rm),
    keypair(init),
    keypair(label),
    keypair(resetconfig),
    keypair(start),
    keypair(stop),
    keypair(resetstats)
#endif
};
struct keywordset keyword_set = KEYWORDSET(keywords);

#ifndef KERNEL
struct _keywords flag_keywords[] =
{flagkeypair(f),
    flagkeypair(d),
    flagkeypair(v),
    flagkeypair(s),
    flagkeypair(r)
};
struct keywordset flag_set = KEYWORDSET(flag_keywords);

#endif

int 
tokenize(char *cptr, char *token[])
{
    char delim;						    /* delimiter for searching for the partner */
    int tokennr;					    /* index of this token */
    tokennr = 0;					    /* none found yet */

    for (;;) {
	while (isspace(*cptr))
	    cptr++;					    /* skip initial white space */
	if ((*cptr == '\0') || (*cptr == '\n') || (*cptr == '#')) /* end of line */
	    return tokennr;				    /* return number of tokens found */
	delim = *cptr;
	token[tokennr] = cptr;				    /* point to it */
	tokennr++;					    /* one more */
	/* XXX this is broken.  It leaves superfluous \\ characters in the text */
	if ((delim == '\'') || (delim == '"')) {	    /* delimitered */
	    for (;;) {
		cptr++;
		if ((*cptr == delim) && (cptr[-1] != '\\')) { /* found the partner */
		    cptr++;				    /* move on past */
		    if (!isspace(*cptr))		    /* error, no space after closing quote */
			return -1;
		    *cptr++ = '\0';			    /* delimit */
		} else if ((*cptr == '\0') || (*cptr == '\n')) /* end of line */
		    return -1;
	    }
	} else {					    /* not quoted */
	    while ((*cptr != '\0') && (!isspace(*cptr)) && (*cptr != '\n'))
		cptr++;
	    if (*cptr != '\0')				    /* not end of the line, */
		*cptr++ = '\0';				    /* delimit and move to the next */
	}
    }
}

/* Find a keyword and return an index */
enum keyword 
get_keyword(char *name, struct keywordset *keywordset)
{
    int i;
    struct _keywords *keywords = keywordset->k;		    /* point to the keywords */
    for (i = 0; i < keywordset->size; i++)
	if (!strcmp(name, keywords[i].name))
	    return (enum keyword) keywords[i].keyword;
    return kw_invalid_keyword;
}