libshare/common/sharetab.c

/*
 * 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 (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sharefs/share.h>
#include "sharetab.h"

/*
 * Get an entry from the share table.
 * There should be at least 4 fields:
 *
 *  pathname  resource  fstype  options  [ description ]
 *
 * A fifth field (description) is optional.
 *
 * Returns:
 *  > 1  valid entry
 *  = 0  end of file
 *  < 0  error
 */
int
getshare(FILE *fd, share_t **shp)
{
    static char *line = NULL;
    static share_t *sh = NULL;
    char *p;
    char *lasts;
    char *w = "\t";

    if (line == NULL) {
        line = (char *)malloc(MAXBUFSIZE+1);
        if (line == NULL)
            return (-1);
    }
    if (sh == NULL) {
        sh = (share_t *)malloc(sizeof (*sh));
        if (sh == NULL)
            return (-1);
    }

    p = fgets(line, MAXBUFSIZE, fd);
    if (p == NULL)
        return (0);
    line[strlen(line) - 1] = '\0';

    sh->sh_path = (char *)strtok_r(p, w, &lasts);
    if (sh->sh_path == NULL)
        return (-3);
    sh->sh_res = (char *)strtok_r(NULL, w, &lasts);
    if (sh->sh_res == NULL)
        return (-3);
    sh->sh_fstype = (char *)strtok_r(NULL, w, &lasts);
    if (sh->sh_fstype == NULL)
        return (-3);
    sh->sh_opts = (char *)strtok_r(NULL, w, &lasts);
    if (sh->sh_opts == NULL)
        return (-3);
    sh->sh_descr = (char *)strtok_r(NULL, "", &lasts);
    if (sh->sh_descr == NULL)
        sh->sh_descr = "";

    *shp = sh;
    return (1);
}

share_t *
sharedup(share_t *sh)
{
    share_t *nsh;

    nsh = (share_t *)calloc(1, sizeof (*nsh));
    if (nsh == NULL)
        return (NULL);

    if (sh->sh_path) {
        nsh->sh_path = strdup(sh->sh_path);
        if (nsh->sh_path == NULL)
            goto alloc_failed;
    }

    if (sh->sh_res) {
        nsh->sh_res = strdup(sh->sh_res);
        if (nsh->sh_res == NULL)
            goto alloc_failed;
    }
    if (sh->sh_fstype) {
        nsh->sh_fstype = strdup(sh->sh_fstype);
        if (nsh->sh_fstype == NULL)
            goto alloc_failed;
    }
    if (sh->sh_opts) {
        nsh->sh_opts = strdup(sh->sh_opts);
        if (nsh->sh_opts == NULL)
            goto alloc_failed;
    }
    if (sh->sh_descr) {
        nsh->sh_descr = strdup(sh->sh_descr);
        if (nsh->sh_descr == NULL)
            goto alloc_failed;
    }
    return (nsh);

alloc_failed:
    sharefree(nsh);
    return (NULL);
}

void
sharefree(share_t *sh)
{
    if (sh->sh_path != NULL)
        free(sh->sh_path);
    if (sh->sh_res != NULL)
        free(sh->sh_res);
    if (sh->sh_fstype != NULL)
        free(sh->sh_fstype);
    if (sh->sh_opts != NULL)
        free(sh->sh_opts);
    if (sh->sh_descr != NULL)
        free(sh->sh_descr);
    free(sh);
}

/*
 * Return the value after "=" for option "opt"
 * in option string "optlist". Caller must
 * free returned value.
 */
char *
getshareopt(char *optlist, char *opt)
{
    char *p, *pe;
    char *b;
    char *bb;
    char *lasts;
    char *val = NULL;

    b = bb = strdup(optlist);
    if (b == NULL)
        return (NULL);

    while (p = (char *)strtok_r(b, ",", &lasts)) {
        b = NULL;
        if (pe = strchr(p, '=')) {
            *pe = '\0';
            if (strcmp(opt, p) == 0) {
                val = strdup(pe + 1);
                goto done;
            }
        }
        if (strcmp(opt, p) == 0) {
            val = strdup("");
            goto done;
        }
    }
done:
    free(bb);
    return (val);
}