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/*
* file.c
*
* Mini "VFS" by Marcus Sundberg
*
* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
* 2003-03-10 - kharris@nexus-tech.net - ported to uboot
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 (at your option) 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/

#include <common.h>
#include <config.h>
#include <malloc.h>
#include <part.h>
#include <fat.h>
#include <linux/stat.h>
#include <linux/time.h>

#if (CONFIG_COMMANDS & CFG_CMD_FAT)

/* Supported filesystems */
static const struct filesystem filesystems[] = {
{ file_fat_detectfs, file_fat_ls, file_fat_read, "FAT" },
};
#define NUM_FILESYS (sizeof(filesystems)/sizeof(struct filesystem))

/* The filesystem which was last detected */
static int current_filesystem = FSTYPE_NONE;

/* The current working directory */
#define CWD_LEN 511
char file_cwd[CWD_LEN+1] = "/";

const char *
file_getfsname(int idx)
{
if (idx < 0 || idx >= NUM_FILESYS) return NULL;

return filesystems[idx].name;
}


static void
pathcpy(char *dest, const char *src)
{
char *origdest = dest;

do {
if (dest-file_cwd >= CWD_LEN) {
*dest = '\0';
return;
}
*(dest) = *(src);
if (*src == '\0') {
if (dest-- != origdest && ISDIRDELIM(*dest)) {
*dest = '\0';
}
return;
}
++dest;
if (ISDIRDELIM(*src)) {
while (ISDIRDELIM(*src)) src++;
} else {
src++;
}
} while (1);
}


int
file_cd(const char *path)
{
if (ISDIRDELIM(*path)) {
while (ISDIRDELIM(*path)) path++;
strncpy(file_cwd+1, path, CWD_LEN-1);
} else {
const char *origpath = path;
char *tmpstr = file_cwd;
int back = 0;

while (*tmpstr != '\0') tmpstr++;
do {
tmpstr--;
} while (ISDIRDELIM(*tmpstr));

while (*path == '.') {
path++;
while (*path == '.') {
path++;
back++;
}
if (*path != '\0' && !ISDIRDELIM(*path)) {
path = origpath;
back = 0;
break;
}
while (ISDIRDELIM(*path)) path++;
origpath = path;
}

while (back--) {
/* Strip off path component */
while (!ISDIRDELIM(*tmpstr)) {
tmpstr--;
}
if (tmpstr == file_cwd) {
/* Incremented again right after the loop. */
tmpstr--;
break;
}
/* Skip delimiters */
while (ISDIRDELIM(*tmpstr)) tmpstr--;
}
tmpstr++;
if (*path == '\0') {
if (tmpstr == file_cwd) {
*tmpstr = '/';
tmpstr++;
}
*tmpstr = '\0';
return 0;
}
*tmpstr = '/';
pathcpy(tmpstr+1, path);
}

return 0;
}


int
file_detectfs(void)
{
int i;

current_filesystem = FSTYPE_NONE;

for (i = 0; i < NUM_FILESYS; i++) {
if (filesystems[i].detect() == 0) {
strcpy(file_cwd, "/");
current_filesystem = i;
break;
}
}

return current_filesystem;
}


int
file_ls(const char *dir)
{
char fullpath[1024];
const char *arg;

if (current_filesystem == FSTYPE_NONE) {
printf("Can't list files without a filesystem!\n");
return -1;
}

if (ISDIRDELIM(*dir)) {
arg = dir;
} else {
sprintf(fullpath, "%s/%s", file_cwd, dir);
arg = fullpath;
}
return filesystems[current_filesystem].ls(arg);
}


long
file_read(const char *filename, void *buffer, unsigned long maxsize)
{
char fullpath[1024];
const char *arg;

if (current_filesystem == FSTYPE_NONE) {
printf("Can't load file without a filesystem!\n");
return -1;
}

if (ISDIRDELIM(*filename)) {
arg = filename;
} else {
sprintf(fullpath, "%s/%s", file_cwd, filename);
arg = fullpath;
}

return filesystems[current_filesystem].read(arg, buffer, maxsize);
}

#endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */
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