libshare/common/parser.c

	parser.c revision 33f5ff17089e3a43e6e730bf80384c233123dbd9
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2012 Milan Jurik. All rights reserved.
 */

#include <stdio.h>
#include <ctype.h>

#define TK_INIT     0
#define TK_TOKEN    1
#define TK_SKIPWHITE    2
#define TK_QUOTED   3

/*
 * assumes quoted strings are delimited by white space (i.e sp
 * "string" sp). Backslash can be used to quote a quote mark.
 * quoted strings will have the quotes stripped.
 */

char *
_sa_get_token(char *string)
{
    static char *orig = NULL;
    static char *curp;
    char *ret;
    int state = TK_INIT;
    int c;
    int quotechar;

    if (string != orig || string == NULL) {
        orig = string;
        curp = string;
        if (string == NULL) {
            return (NULL);
        }
    }
    ret = curp;
    while ((c = *curp) != '\0') {
        switch (state) {
        case TK_SKIPWHITE:
        case TK_INIT:
            if (isspace(c)) {
                while (*curp && isspace(*curp))
                    curp++;
                ret = curp;
            }
            if (c == '"' || c == '\'') {
                state = TK_QUOTED;
                curp++;
                ret = curp;
                quotechar = c; /* want to match for close */
            } else {
                state = TK_TOKEN;
            }
            break;
        case TK_TOKEN:
            switch (c) {
            case '\\':
                curp++;
                if (*curp) {
                    curp++;
                    break;
                }
                return (ret);
            default:
                if (*curp == '\0' || isspace(c)) {
                    *curp++ = '\0';
                    return (ret);
                }
                curp++;
                break;
            }
            break;
        case TK_QUOTED:
            switch (c) {
            case '\\':
                curp++;
                if (*curp) {
                    curp++;
                    break;
                }
                curp++;
                break;
            default:
                if (c == '\0' || c == quotechar) {
                    *curp++ = '\0';
                    return (ret);
                }
                curp++;
                break;
            }
            break;
        }
    }
    return (NULL);
}