link_audit/common/env.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) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
 */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <env.h>

static const char   *token = ":";

void
build_env_list(Elist **list, const char *env)
{
    char    *envstr;
    char    *tok;
    char    *lasts;

    if ((envstr = getenv(env)) == NULL)
        return;
    envstr = strdup(envstr);
    tok = strtok_r(envstr, token, &lasts);
    while (tok) {
        Elist   *lp;
        if ((lp = (Elist *)malloc(sizeof (Elist))) == NULL) {
            (void) printf("build_list: malloc failed\n");
            exit(1);
        }
        lp->l_libname = strdup(tok);
        lp->l_next = *list;
        *list = lp;
        tok = strtok_r(NULL, token, &lasts);
    }
    free(envstr);
}


Elist *
check_list(Elist *list, const char *str)
{
    const char  *basestr;

    if (list == NULL)
        return (NULL);

    /*
     * Is this a basename or a relative path name
     */
    if ((basestr = strrchr(str, '/')) != NULL)
        basestr++;
    else
        basestr = str;


    for (; list; list = list->l_next) {
        if (strchr(list->l_libname, '/') == NULL) {
            if (strcmp(basestr, list->l_libname) == 0)
                return (list);
        } else {
            if (strcmp(str, list->l_libname) == 0)
                return (list);
        }
    }
    return (NULL);
}

char *
checkenv(const char *env)
{
    char    *envstr;
    if ((envstr = getenv(env)) == NULL)
        return (NULL);
    while (*envstr == ' ')
        envstr++;
    if (*envstr == '\0')
        return (NULL);
    return (envstr);
}