fs.c

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/* -*- C -*- */
/*
 * Copyright (c) 2014-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_LIB
#include "lib/trace.h"

#include <unistd.h>             /* close(2) */
#include <dirent.h>             /* opendir(3) */
#include <fcntl.h>              /* open(2) */
#include <errno.h>
#include "lib/memory.h"         /* M0_ALLOC_ARR */

M0_INTERNAL int m0_cleandir(const char *dir)
{
        struct dirent *de;
        DIR           *d;
        int            rc;
        int            fd;

        fd = open(dir, O_RDONLY|O_DIRECTORY);
        if (fd == -1) {
                if (errno == ENOENT)
                        return M0_RC(0);
                rc = -errno;
                M0_LOG(M0_NOTICE, "open(%s) failed: rc=%d", dir, rc);
                return M0_ERR(rc);
        }
        d = opendir(dir);
        if (d != NULL) {
                while ((de = readdir(d)) != NULL)
                        unlinkat(fd, de->d_name, 0);
                closedir(d);
        }
        close(fd);

        rc = rmdir(dir) == 0 ? 0 : -errno;
        if (rc != 0)
                M0_LOG(M0_ERROR, "rmdir(%s) failed: rc=%d", dir, rc);
        return M0_RC(rc);
}

M0_INTERNAL int m0_file_read(const char *path, char **out)
{
        FILE  *f;
        long   size;
        size_t n;
        int    rc = 0;

        M0_ENTRY("path=`%s'", path);

        f = fopen(path, "rb");
        if (f == NULL)
                return M0_ERR_INFO(-errno, "path=`%s'", path);

        rc = fseek(f, 0, SEEK_END);
        if (rc == 0) {
                size = ftell(f);
                rc = fseek(f, 0, SEEK_SET);
        }
        if (rc != 0) {
                fclose(f);
                return M0_ERR_INFO(-errno, "fseek() failed: path=`%s'", path);
        }
        /* it should be freed by the caller */
        M0_ALLOC_ARR(*out, size + 1);
        if (*out != NULL) {
                n = fread(*out, 1, size + 1, f);
                M0_ASSERT_INFO(n == size, "n=%zu size=%ld", n, size);
                if (ferror(f))
                        rc = -errno;
                else if (!feof(f))
                        rc = M0_ERR(-EFBIG);
                else
                        (*out)[n] = '\0';
        } else {
                rc = M0_ERR(-ENOMEM);
        }

        fclose(f);
        return M0_RC(rc);
}

#undef M0_TRACE_SUBSYSTEM

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */