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#pragma once
#include <cstdint>
#include <drivers/disk.hpp>
#include <generic/lock/mutex.hpp>
#include <utils/linux.hpp>
enum class file_descriptor_type : std::uint8_t {
unallocated = 0,
file = 1,
pipe = 2,
socket = 3,
epoll = 4,
memfd = 5
};
struct stat {
dev_t st_dev;
ino_t st_ino;
mode_t st_mode;
nlink_t st_nlink;
uid_t st_uid;
gid_t st_gid;
dev_t st_rdev;
off_t st_size;
blksize_t st_blksize;
blkcnt_t st_blocks;
struct timespec st_atim;
struct timespec st_mtim;
struct timespec st_ctim;
#define st_atime st_atim.tv_sec
#define st_mtime st_mtim.tv_sec
#define st_ctime st_ctim.tv_sec
};
struct filesystem {
locks::mutex lock;
union {
std::uint64_t partition;
} fs_specific;
std::uint32_t (*open)(filesystem* fs, void* file_desc, char* path);
char path[2048];
};
struct file_descriptor {
file_descriptor_type type;
std::size_t offset;
std::uint32_t flags;
union {
std::uint64_t ino;
std::uint64_t tmpfs_pointer;
} fs_specific;
struct {
disk* target_disk;
filesystem* fs;
signed long (*read)(file_descriptor* file, void* buffer, signed long count);
signed long (*write)(file_descriptor* file, void* buffer, signed long count);
std::int32_t (*stat)(file_descriptor* file, stat* out);
void (*close)(file_descriptor* file);
} vnode;
};
namespace vfs {
void init();
std::int32_t open(file_descriptor* fd, char* path, bool follow_symlinks);
std::int32_t create(char* path, std::uint32_t mode); // mode contains type too
std::int32_t readlink(char* path, char* out, std::uint32_t out_len);
}
// took from old kernel
namespace vfs {
static inline std::uint64_t resolve_count(char* str,std::uint64_t sptr,char delim) {
char* current = str;
std::uint16_t att = 0;
std::uint64_t ptr = sptr;
while(current[ptr] != delim) {
if(att > 1024)
return 0;
att++;
if(ptr != 0) {
ptr--;
}
}
return ptr;
}
static inline int normalize_path(const char* src, char* dest, std::uint64_t dest_size) {
if (!src ||!dest || dest_size < 2) return -1;
std::uint64_t j = 0;
int prev_slash = 0;
for (std::uint64_t i = 0; src[i] && j < dest_size - 1; i++) {
if (src[i] == '/') {
if (!prev_slash) {
dest[j++] = '/';
prev_slash = 1;
}
} else {
dest[j++] = src[i];
prev_slash = 0;
}
}
if (j > 1 && dest[j-1] == '/') j--;
if (j >= dest_size) {
dest[0] = '\0';
return -1;
}
dest[j] = '\0';
return 0;
}
/* I'll use path resolver from my old kernel */
static inline void resolve_path(const char* inter0,const char* base, char *result, char spec) {
char* next = 0;
char buffer2_in_stack[2048];
char inter[2048];
char* buffer = 0;
char* final_buffer = (char*)buffer2_in_stack;
std::uint64_t ptr = klibc::strlen((char*)base);
char is_first = 1;
char is_full = 0;
klibc::memcpy(inter,inter0,klibc::strlen(inter0) + 1);
if(klibc::strlen((char*)inter) == 1 && inter[0] == '.') {
klibc::memcpy(result,base,klibc::strlen((char*)base) + 1);
if(result[0] == '\0') {
result[0] = '/';
result[1] = '\0';
}
return;
}
if(!klibc::strcmp(inter,"/")) {
klibc::memcpy(result,inter,klibc::strlen((char*)inter) + 1);
if(result[0] == '\0') {
result[0] = '/';
result[1] = '\0';
}
return;
}
if(inter[0] == '/') {
ptr = 0;
is_full = 1;
} else {
klibc::memcpy(final_buffer,base,klibc::strlen((char*)base) + 1);
}
if(spec)
is_first = 0;
if(!klibc::strcmp(base,"/"))
is_first = 0;
buffer = klibc::strtok(&next,(char*)inter,"/");
while(buffer) {
if(is_first && !is_full) {
std::uint64_t mm = resolve_count(final_buffer,ptr,'/');
if(ptr < mm) {
final_buffer[0] = '/';
final_buffer[1] = '\0';
ptr = 1;
continue;
}
ptr = mm;
final_buffer[ptr] = '\0';
is_first = 0;
}
if(!klibc::strcmp(buffer,"..")) {
std::uint64_t mm = resolve_count(final_buffer,ptr,'/');
if(!klibc::strcmp(final_buffer,"/\0")) {
buffer = klibc::strtok(&next,0,"/");
continue;
}
if(ptr < mm) {
final_buffer[0] = '/';
final_buffer[1] = '\0';
ptr = 1;
continue;
}
ptr = mm;
final_buffer[ptr] = '\0';
} else if(klibc::strcmp(buffer,"./") && klibc::strcmp(buffer,".")) {
final_buffer[ptr] = '/';
ptr++;
std::uint64_t mm = 0;
mm = klibc::strlen(buffer);
klibc::memcpy((char*)((std::uint64_t)final_buffer + ptr),buffer,mm);
ptr += mm;
final_buffer[ptr] = '\0';
}
buffer = klibc::strtok(&next,0,"/");
}
normalize_path(final_buffer,result,2048);
if(result[0] == '\0') {
result[0] = '/';
result[1] = '\0';
}
}
}
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