nfs_uri.c

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/*
 * Copyright (C) 2014 Marin Hannache <ipxe@mareo.fr>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <libgen.h>
#include <ipxe/nfs_uri.h>

/** @file
 *
 * Network File System protocol URI handling functions
 *
 */

int nfs_uri_init ( struct nfs_uri *nfs_uri, const struct uri *uri ) {
        if ( ! ( nfs_uri->mountpoint = strdup ( uri->path ) ) )
                return -ENOMEM;

        nfs_uri->filename = basename ( nfs_uri->mountpoint );
        if ( strchr ( uri->path, '/' ) != NULL )
                nfs_uri->mountpoint = dirname ( nfs_uri->mountpoint );

        if ( nfs_uri->filename[0] == '\0' ) {
                free ( nfs_uri->mountpoint );
                return -EINVAL;
        }

        if ( ! ( nfs_uri->path = strdup ( nfs_uri->filename ) ) ) {
                free ( nfs_uri->mountpoint );
                return -ENOMEM;
        }
        nfs_uri->lookup_pos = nfs_uri->path;

        return 0;
}

char *nfs_uri_mountpoint ( const struct nfs_uri *uri ) {
        if ( uri->mountpoint + 1 == uri->filename ||
             uri->mountpoint     == uri->filename )
                return "/";

        return uri->mountpoint;
}

int nfs_uri_next_mountpoint ( struct nfs_uri *uri ) {
        char *sep;

        if ( uri->mountpoint + 1 == uri->filename ||
             uri->mountpoint     == uri->filename )
                return -ENOENT;

        sep = strrchr ( uri->mountpoint, '/' );
        uri->filename[-1] = '/';
        uri->filename     = sep + 1;
        *sep = '\0';

        free ( uri->path );
        if ( ! ( uri->path = strdup ( uri->filename ) ) ) {
                uri->path = NULL;
                return -ENOMEM;
        }
        uri->lookup_pos = uri->path;

        return 0;
}

int nfs_uri_symlink ( struct nfs_uri *uri, const char *symlink ) {
        size_t len;
        char *new_path;

        if ( ! uri->path )
                return -EINVAL;

        if ( *symlink == '/' )
        {
                if ( strncmp ( symlink, uri->mountpoint,
                               strlen ( uri->mountpoint ) ) != 0 )
                        return -EINVAL;

                len = strlen ( uri->lookup_pos ) + strlen ( symlink ) - \
                      strlen ( uri->mountpoint );
                if ( ! ( new_path = malloc ( len * sizeof ( char ) ) ) )
                        return -ENOMEM;

                strcpy ( new_path, symlink + strlen ( uri->mountpoint ) );
                strcpy ( new_path + strlen ( new_path ), uri->lookup_pos );

        } else {
                len = strlen ( uri->lookup_pos ) + strlen ( symlink );
                if ( ! ( new_path = malloc ( len * sizeof ( char ) ) ) )
                        return -ENOMEM;


                strcpy ( new_path, symlink );
                strcpy ( new_path + strlen ( new_path ), uri->lookup_pos );
        }

        free ( uri->path );
        uri->lookup_pos = uri->path = new_path;

        return 0;
}

char *nfs_uri_next_path_component ( struct nfs_uri *uri ) {
        char *sep;
        char *start;

        if ( ! uri->path )
                return NULL;

        for ( sep = uri->lookup_pos ; *sep != '\0' && *sep != '/'; sep++ )
                ;

        start = uri->lookup_pos;
        uri->lookup_pos = sep;
        if ( *sep != '\0' ) {
                uri->lookup_pos++;
                *sep = '\0';
                if ( *start == '\0' )
                        return nfs_uri_next_path_component ( uri );
        }

        return start;
}

void nfs_uri_free ( struct nfs_uri *uri ) {
        free ( uri->mountpoint );
        free ( uri->path );
        uri->mountpoint = NULL;
        uri->path       = NULL;
}