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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <os/vnode.h>
#include <os/kalloc.h>
#include <os/vfs.h>
#include <string.h>
/*
* Returns a value of zero if a character value
* within a path is valid, otherwise a less than
* zero value on error.
*/
static int
vfs_pathc_valid(char c)
{
/* Handle [A-Za-z] */
if (c >= 'a' && c <= 'z')
return 0;
if (c >= 'A' && c <= 'Z')
return 0;
/* Handle [0-9] and '/' */
if (c >= '0' && c <= '9')
return 0;
if (c == '/')
return 0;
return -1;
}
/*
* Allocate a new vnode
*/
int
vfs_valloc(struct vnode **resp, vtype_t type, int flags)
{
struct vnode *vp;
if (resp == NULL) {
return -EINVAL;
}
/* Attempt to allocate a vnode */
vp = kalloc(sizeof(*vp));
if (vp == NULL) {
return -ENOMEM;
}
memset(vp, 0, sizeof(*vp));
vp->type = type;
*resp = vp;
return 0;
}
int
vfs_vrel(struct vnode *vp, int flags)
{
if (vp == NULL) {
return -EINVAL;
}
kfree(vp);
return 0;
}
/*
* Count number of components
*/
int
vfs_cmp_cnt(const char *path)
{
const char *p;
int error, cnt = -1;
if (path == NULL) {
return -EINVAL;
}
if (*path != '/') {
return -ENOENT;
}
/* Is pointing to root? */
if (path[0] == '/' && path[1] == '\0') {
return 1;
}
p = path;
cnt = 0;
while (*p != '\0') {
while (*p == '/')
++p;
while (*p != '/' && *p != '\0')
error = vfs_pathc_valid(*p++);
/* Invalid character? */
if (error < 0)
return -EINVAL;
/* Break if we got NUL */
if (*p == '\0')
break;
++p, ++cnt;
}
return cnt + 1;
}
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