modules/filesystem/dir.c

/*
 * Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

#include "dlz_minimal.h"
#include "dir.h"

void
dir_init(dir_t *dir) {
    dir->entry.name[0] = '\0';
    dir->entry.length = 0;

    dir->handle = NULL;
}

isc_result_t
dir_open(dir_t *dir, const char *dirname) {
    char *p;
    isc_result_t result = ISC_R_SUCCESS;

    if (strlen(dirname) + 3 > sizeof(dir->dirname))
        return (ISC_R_NOSPACE);
    strcpy(dir->dirname, dirname);

    p = dir->dirname + strlen(dir->dirname);
    if (dir->dirname < p && *(p - 1) != '/')
        *p++ = '/';
    *p++ = '*';
    *p = '\0';

    dir->handle = opendir(dirname);
    if (dir->handle == NULL) {
        switch (errno) {
        case ENOTDIR:
        case ELOOP:
        case EINVAL:
        case ENAMETOOLONG:
        case EBADF:
            result = ISC_R_INVALIDFILE;
        case ENOENT:
            result = ISC_R_FILENOTFOUND;
        case EACCES:
        case EPERM:
            result = ISC_R_NOPERM;
        case ENOMEM:
            result = ISC_R_NOMEMORY;
        default:
            result = ISC_R_UNEXPECTED;
        }
    }

    return (result);
}

/*!
 * \brief Return previously retrieved file or get next one.

 * Unix's dirent has
 * separate open and read functions, but the Win32 and DOS interfaces open
 * the dir stream and reads the first file in one operation.
 */
isc_result_t
dir_read(dir_t *dir) {
    struct dirent *entry;

    entry = readdir(dir->handle);
    if (entry == NULL)
        return (ISC_R_NOMORE);

    if (sizeof(dir->entry.name) <= strlen(entry->d_name))
        return (ISC_R_UNEXPECTED);

    strcpy(dir->entry.name, entry->d_name);

    dir->entry.length = strlen(entry->d_name);
    return (ISC_R_SUCCESS);
}

/*!
 * \brief Close directory stream.
 */
void
dir_close(dir_t *dir) {
       (void)closedir(dir->handle);
       dir->handle = NULL;
}

/*!
 * \brief Reposition directory stream at start.
 */
isc_result_t
dir_reset(dir_t *dir) {
    rewinddir(dir->handle);

    return (ISC_R_SUCCESS);
}