netsurf/atari/file.c

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/*
* Copyright 2014 Ole Loots <ole@monochrom.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf 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; version 2 of the License.
*
* NetSurf 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "utils/utils.h"
#include "utils/corestrings.h"
#include "utils/url.h"
#include "utils/nsurl.h"
#include "utils/file.h"
/**
* \file
* Atari file handling callbacks.
*
* Most of this code was taken from windows/gui.c
*/
/**
* Generate a GEMDOS path from one or more component elemnts.
*
* If a string is allocated it must be freed by the caller.
*
* @param[in,out] str pointer to string pointer if this is NULL enough
* storage will be allocated for the complete path.
* @param[in,out] size The size of the space available if \a str not
* NULL on input and if not NULL set to the total
* output length on output.
* @param[in] nemb The number of elements.
* @param[in] ... The elements of the path as string pointers.
* @return NSERROR_OK and the complete path is written to str
* or error code on faliure.
*/
static nserror atari_mkpath(char **str, size_t *size, size_t nelm, va_list ap)
{
return vsnstrjoin(str, size, '\\', nelm, ap);
}
/**
* Get the basename of a file using GEMDOS path handling.
*
* This gets the last element of a path and returns it.
*
* @param[in] path The path to extract the name from.
* @param[in,out] str Pointer to string pointer if this is NULL enough
* storage will be allocated for the path element.
* @param[in,out] size The size of the space available if \a
* str not NULL on input and set to the total
* output length on output.
* @return NSERROR_OK and the complete path is written to str
* or error code on faliure.
*/
static nserror atari_basename(const char *path, char **str, size_t *size)
{
const char *leafname;
char *fname;
if (path == NULL) {
return NSERROR_BAD_PARAMETER;
}
leafname = strrchr(path, '\\');
if (!leafname) {
leafname = path;
} else {
leafname += 1;
}
fname = strdup(leafname);
if (fname == NULL) {
return NSERROR_NOMEM;
}
*str = fname;
if (size != NULL) {
*size = strlen(fname);
}
return NSERROR_OK;
}
/**
* Create a path from a nsurl using GEMDOS file handling.
*
* @parm[in] url The url to encode.
* @param[out] path_out A string containing the result path which should
* be freed by the caller.
* @return NSERROR_OK and the path is written to \a path or error code
* on faliure.
*/
static nserror atari_nsurl_to_path(struct nsurl *url, char **path_out)
{
lwc_string *urlpath;
char *path;
bool match;
lwc_string *scheme;
nserror res;
if ((url == NULL) || (path_out == NULL)) {
return NSERROR_BAD_PARAMETER;
}
scheme = nsurl_get_component(url, NSURL_SCHEME);
if (lwc_string_caseless_isequal(scheme, corestring_lwc_file,
&match) != lwc_error_ok)
{
return NSERROR_BAD_PARAMETER;
}
lwc_string_unref(scheme);
if (match == false) {
return NSERROR_BAD_PARAMETER;
}
urlpath = nsurl_get_component(url, NSURL_PATH);
if (urlpath == NULL) {
return NSERROR_BAD_PARAMETER;
}
res = url_unescape(lwc_string_data(urlpath), &path);
lwc_string_unref(urlpath);
if (res != NSERROR_OK) {
return res;
}
/* if there is a drive: prefix treat path as DOS filename */
if ((path[2] == ':') || (path[2] == '|')) {
/* move the string down to remove leading / note the
* strlen is *not* copying too much data as we are
* moving the null too!
*/
memmove(path, path + 1, strlen(path));
}
/* if the path does not have a drive letter we return the
* complete path.
*/
/** @todo Need to check returning the unaltered path in this
* case is correct
*/
*path_out = path;
return NSERROR_OK;
}
/**
* Create a nsurl from a path using GEMDOS file handling.
*
* Perform the necessary operations on a path to generate a nsurl.
*
* @param[in] path The path to convert.
* @param[out] url_out pointer to recive the nsurl, The returned url
* should be unreferenced by the caller.
* @return NSERROR_OK and the url is placed in \a url or error code on
* faliure.
*/
static nserror atari_path_to_nsurl(const char *path, struct nsurl **url_out)
{
nserror ret;
int urllen;
char *urlstr;
char *escpath; /* escaped version of the path */
char *escpaths;
if ((path == NULL) || (url_out == NULL) || (*path == 0)) {
return NSERROR_BAD_PARAMETER;
}
/* escape the path so it can be placed in a url */
ret = url_escape(path, 0, false, "/", &escpath);
if (ret != NSERROR_OK) {
return ret;
}
/* remove unecessary / as file: paths are already absolute */
escpaths = escpath;
while (*escpaths == '/') {
escpaths++;
}
/* build url as a string for nsurl constructor */
urllen = strlen(escpaths) + FILE_SCHEME_PREFIX_LEN + 1;
urlstr = malloc(urllen);
if (urlstr == NULL) {
free(escpath);
return NSERROR_NOMEM;
}
snprintf(urlstr, urllen, "%s%s", FILE_SCHEME_PREFIX, escpaths);
free(escpath);
ret = nsurl_create(urlstr, url_out);
free(urlstr);
return ret;
}
/**
* Ensure that all directory elements needed to store a filename exist.
*
* @param fname The filename to ensure the path to exists.
* @return NSERROR_OK on success or error code on failure.
*/
static nserror atari_mkdir_all(const char *fname)
{
char *dname;
char *sep;
struct stat sb;
dname = strdup(fname);
sep = strrchr(dname, '/');
if (sep == NULL) {
/* no directory separator path is just filename so its ok */
free(dname);
return NSERROR_OK;
}
*sep = 0; /* null terminate directory path */
if (stat(dname, &sb) == 0) {
free(dname);
if (S_ISDIR(sb.st_mode)) {
/* path to file exists and is a directory */
return NSERROR_OK;
}
return NSERROR_NOT_DIRECTORY;
}
*sep = '/'; /* restore separator */
sep = dname;
while (*sep == '/') {
sep++;
}
while ((sep = strchr(sep, '/')) != NULL) {
*sep = 0;
if (stat(dname, &sb) != 0) {
if (nsmkdir(dname, S_IRWXU) != 0) {
/* could not create path element */
free(dname);
return NSERROR_NOT_FOUND;
}
} else {
if (! S_ISDIR(sb.st_mode)) {
/* path element not a directory */
free(dname);
return NSERROR_NOT_DIRECTORY;
}
}
*sep = '/'; /* restore separator */
/* skip directory separators */
while (*sep == '/') {
sep++;
}
}
free(dname);
return NSERROR_OK;
}
/* atari file handling table */
static struct gui_file_table file_table = {
.mkpath = atari_mkpath,
.basename = atari_basename,
.nsurl_to_path = atari_nsurl_to_path,
.path_to_nsurl = atari_path_to_nsurl,
.mkdir_all = atari_mkdir_all,
};
struct gui_file_table *atari_file_table = &file_table;