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Copy pathplatform_riscos.c
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503 lines (458 loc) · 13.7 KB
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#include "namespace.h"
#include "platform.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#ifdef __riscos__
#include "riscos_identity.h"
#include <kernel.h>
#include <swis.h>
#include <unixlib/local.h>
#endif
int platform_joinpath(char *dst, size_t size, const char *dir,
const char *name) {
#ifdef __riscos__
size_t dirlen;
if(!dst || !dir || !name || !size)
return -1;
dirlen = strlen(dir);
/* FileSwitch uses dots between native path components and slashes
* inside leaf names where Unix paths use full stops. */
if(strchr(dir, ':')) {
size_t used = dirlen;
if(used >= size)
return -1;
memcpy(dst, dir, used);
while(*name == '/')
name++;
if(*name && used && dst[used - 1] != ':') {
if(used + 1 >= size)
return -1;
dst[used++] = '.';
}
for(; *name; name++) {
if(used + 1 >= size)
return -1;
dst[used++] = *name == '/' ? '.' : *name == '.' ? '/' : *name;
}
dst[used] = '\0';
return 0;
}
#endif
return joinpath(dst, size, dir, name);
}
void platform_namespace_cleanup(Namespace *ns) {
(void)ns;
#ifdef __riscos__
riscos_identity_cleanup();
#endif
}
int platform_namespace_ready(Namespace *ns) {
#ifdef __riscos__
if(ns->synthetic)
return 0;
#endif
struct stat st;
if(ns->synthetic) {
errno = EINVAL;
return -1;
}
return stat(ns->native_root, &st) < 0 || !S_ISDIR(st.st_mode) ? -1 : 0;
}
int platform_namespace_init(Namespace *ns) {
#ifdef __riscos__
return namespace_use_synthetic(ns);
#else
return namespace_use_native(ns, "/");
#endif
}
#ifdef __riscos__
static int native_directory(const char *path) {
ResolvedPath resolved;
struct stat st;
memset(&resolved, 0, sizeof(resolved));
if(snprintf(resolved.native_path, sizeof(resolved.native_path), "%s", path) >=
(int)sizeof(resolved.native_path))
return 0;
return platform_lstat(&resolved, &st) == 0 && S_ISDIR(st.st_mode);
}
#endif
#ifdef __riscos__
static int add_drive_root(Namespace *ns, const char *name, unsigned drive) {
char path[S9_PATH_MAX];
char root_name[132];
if(snprintf(path, sizeof(path), "%s::%u.$", name, drive) >=
(int)sizeof(path) || !native_directory(path))
return 0;
if(snprintf(root_name, sizeof(root_name), "%s-%u", name, drive) >=
(int)sizeof(root_name))
return 0;
return namespace_add_root(ns, root_name, path);
}
#endif
int platform_namespace_discover(Namespace *ns) {
#ifdef __riscos__
unsigned number;
for(number = 0; number < 256; number++) {
char name[128];
char path[S9_PATH_MAX];
unsigned drive;
int direct;
int root_zero = 0;
if(_swix(OS_FSControl, _INR(0, 3), 33, number, name,
sizeof(name)) != NULL || !name[0])
continue;
if(snprintf(path, sizeof(path), "%s:", name) >= (int)sizeof(path))
continue;
direct = native_directory(path);
if(!direct) {
if(snprintf(path, sizeof(path), "%s::0.$", name) >=
(int)sizeof(path))
continue;
root_zero = native_directory(path);
}
if((direct || root_zero) && namespace_add_root(ns, name, path) < 0)
return -1;
if(strcmp(name, "SCSI") == 0) {
for(drive = 0; drive < 8; drive++) {
int ready = 0;
if(drive == 0 && root_zero)
continue;
if(drive >= 4 &&
(_swix(SCSIFS_TestReady, _IN(1)|_OUT(0), drive,
&ready) != NULL || ready != 2))
continue;
if(add_drive_root(ns, name, drive) < 0)
return -1;
}
} else if(strcmp(name, "CDFS") == 0) {
int configured = 0;
if(_swix(CDFS_GetNumberOfDrives, _OUT(0), &configured) == NULL) {
for(drive = 1; drive < (unsigned)configured; drive++) {
if(add_drive_root(ns, name, drive) < 0)
return -1;
}
}
}
}
#else
(void)ns;
#endif
return 0;
}
static int path_allowed(const ResolvedPath *path) {
if(!path || path->synthetic || !path->native_path[0]) {
errno = EINVAL;
return 0;
}
return 1;
}
int platform_lstat(const ResolvedPath *path, struct stat *st) {
if(!path_allowed(path))
return -1;
#ifdef __riscos__
/* UnixLib lstat can block on files supplied by non-FileCore filing
* systems. Query the filing system directly for 9P metadata instead. */
char native[S9_PATH_MAX];
int type, load, exec, length, attributes;
unsigned long long centiseconds;
_kernel_swi_regs regs;
if(!__riscosify_std(path->native_path, 0, native, sizeof(native), NULL)) {
errno = EILSEQ;
return -1;
}
memset(®s, 0, sizeof(regs));
regs.r[0] = 5;
regs.r[1] = (intptr_t)native;
if(_kernel_swi(OS_File, ®s, ®s) != NULL) {
/* Some filing systems reject OS_File on their volume root but
* enumerate that root through OS_GBPB. */
char first[S9_PATH_MAX];
memset(®s, 0, sizeof(regs));
regs.r[0] = 9;
regs.r[1] = (intptr_t)native;
regs.r[2] = (intptr_t)first;
regs.r[3] = 1;
regs.r[4] = 0;
regs.r[5] = (int)sizeof(first);
if(_kernel_swi(OS_GBPB, ®s, ®s) != NULL) {
errno = EIO;
return -1;
}
type = 3;
load = exec = length = attributes = 0;
} else {
type = (int)regs.r[0];
load = (int)regs.r[2];
exec = (int)regs.r[3];
length = (int)regs.r[4];
attributes = (int)regs.r[5];
}
if(type == 0) {
errno = ENOENT;
return -1;
}
memset(st, 0, sizeof(*st));
riscos_identity_stat(native, st);
st->st_mode = type == 2 || type == 3 ? S_IFDIR : S_IFREG;
if(attributes & 1) st->st_mode |= 0400;
if(attributes & 2) st->st_mode |= 0200;
if(attributes & 16) st->st_mode |= 0044;
if(attributes & 32) st->st_mode |= 0022;
if(S_ISDIR(st->st_mode)) {
/* Some filing systems report no attributes for a volume root. */
if(!(attributes & 0x33))
st->st_mode |= 0755;
else
st->st_mode |= (st->st_mode & 0444) >> 2;
}
st->st_size = (unsigned int)length;
if(((unsigned int)load & 0xfff00000u) == 0xfff00000u) {
centiseconds = (((unsigned long long)(unsigned int)load & 0xffu) << 32) |
(unsigned int)exec;
if(centiseconds >= 220898880000ULL)
st->st_mtime = (time_t)(centiseconds / 100 - 2208988800ULL);
}
st->st_atime = st->st_mtime;
return 0;
#else
return lstat(path->native_path, st);
#endif
}
int platform_fstat(int fd, const ResolvedPath *path,
const struct stat *opened, struct stat *st) {
#ifdef __riscos__
struct stat native;
dev_t device = opened->st_dev;
ino_t inode = opened->st_ino;
if(platform_lstat(path, &native) == 0 &&
native.st_dev == device && native.st_ino == inode) {
*st = native;
return 0;
}
/* The pathname disappeared or was replaced. The descriptor still names
* the original file, but UnixLib's inode fields are not our identity. */
if(fstat(fd, st) < 0)
return -1;
st->st_dev = device;
st->st_ino = inode;
return 0;
#else
(void)path;
(void)opened;
return fstat(fd, st);
#endif
}
int platform_lstat_child(PlatformDir *directory, const ResolvedPath *path,
const char *name, struct stat *st) {
#ifdef __riscos__
(void)directory;
(void)name;
return platform_lstat(path, st);
#else
(void)path;
return fstatat(dirfd(directory), name, st, AT_SYMLINK_NOFOLLOW);
#endif
}
int platform_open(const ResolvedPath *path, int flags, mode_t mode) {
return path_allowed(path) ? open(path->native_path, flags, mode) : -1;
}
#ifdef __riscos__
struct PlatformDir {
char native[S9_PATH_MAX];
long position;
struct dirent entry;
};
#endif
PlatformDir *platform_opendir(const ResolvedPath *path) {
#ifdef __riscos__
PlatformDir *directory;
struct stat st;
/* FileSwitch skips FAT directory metadata entries that UnixLib readdir
* exposes as repeated names. Use its directory cursor directly. */
if(!path_allowed(path))
return NULL;
if(platform_lstat(path, &st) < 0 || !S_ISDIR(st.st_mode)) {
errno = ENOTDIR;
return NULL;
}
directory = calloc(1, sizeof(*directory));
if(!directory)
return NULL;
if(!__riscosify_std(path->native_path, 0, directory->native,
sizeof(directory->native), NULL)) {
free(directory);
errno = ENOTDIR;
return NULL;
}
directory->position = 0;
return directory;
#else
return path_allowed(path) ? opendir(path->native_path) : NULL;
#endif
}
int platform_fstatdir(PlatformDir *directory, struct stat *st) {
#ifdef __riscos__
(void)directory;
(void)st;
errno = ENOTSUP;
return -1;
#else
return fstat(dirfd(directory), st);
#endif
}
struct dirent *platform_readdir(PlatformDir *directory) {
#ifdef __riscos__
char name[S9_PATH_MAX];
_kernel_swi_regs regs;
_kernel_oserror *error;
size_t length;
size_t i;
const char *end;
if(directory->position == -1) {
errno = 0;
return NULL;
}
memset(®s, 0, sizeof(regs));
regs.r[0] = 9;
regs.r[1] = (intptr_t)directory->native;
regs.r[2] = (intptr_t)name;
regs.r[3] = 1;
regs.r[4] = directory->position;
regs.r[5] = (int)sizeof(name);
error = _kernel_swi(OS_GBPB, ®s, ®s);
if(error) {
errno = EIO;
return NULL;
}
directory->position = regs.r[4];
if(regs.r[3] == 0) {
errno = 0;
return NULL;
}
end = memchr(name, 0, sizeof(name));
if(!end) {
errno = EIO;
return NULL;
}
length = (size_t)(end - name);
if(length >= sizeof(directory->entry.d_name)) {
errno = ENAMETOOLONG;
return NULL;
}
memcpy(directory->entry.d_name, name, length + 1);
/* A slash in a RISC OS leaf name represents a Unix full stop. */
for(i = 0; i < length; i++) {
if(directory->entry.d_name[i] == '/')
directory->entry.d_name[i] = '.';
}
return &directory->entry;
#else
return readdir(directory);
#endif
}
long platform_telldir(PlatformDir *directory) {
#ifdef __riscos__
return directory->position;
#else
return telldir(directory);
#endif
}
void platform_seekdir(PlatformDir *directory, long position) {
#ifdef __riscos__
directory->position = position;
#else
seekdir(directory, position);
#endif
}
void platform_rewinddir(PlatformDir *directory) {
#ifdef __riscos__
directory->position = 0;
#else
rewinddir(directory);
#endif
}
int platform_closedir(PlatformDir *directory) {
#ifdef __riscos__
free(directory);
return 0;
#else
return closedir(directory);
#endif
}
ssize_t platform_readlink(const ResolvedPath *path, char *buffer, size_t size) {
return path_allowed(path) ? readlink(path->native_path, buffer, size) : -1;
}
int platform_access_execute(const ResolvedPath *path) {
return path_allowed(path) ? access(path->native_path, X_OK) : -1;
}
int platform_mkdir(const ResolvedPath *path, mode_t mode) {
return path_allowed(path) ? mkdir(path->native_path, mode) : -1;
}
int platform_symlink(const char *target, const ResolvedPath *path) {
return path_allowed(path) ? symlink(target, path->native_path) : -1;
}
int platform_mknod(const ResolvedPath *path, mode_t mode, unsigned major,
unsigned minor) {
(void)major;
(void)minor;
if(!path_allowed(path))
return -1;
if(S_ISFIFO(mode))
return mkfifo(path->native_path, mode & 07777);
errno = EOPNOTSUPP;
return -1;
}
int platform_remove(const ResolvedPath *path, int directory) {
if(!path_allowed(path))
return -1;
return directory ? rmdir(path->native_path) : unlink(path->native_path);
}
int platform_rename(const ResolvedPath *old_path,
const ResolvedPath *new_path) {
if(!path_allowed(old_path) || !path_allowed(new_path))
return -1;
#ifdef __riscos__
char old_native[S9_PATH_MAX];
char new_native[S9_PATH_MAX];
if(!__riscosify_std(old_path->native_path, 0, old_native,
sizeof(old_native), NULL) ||
!__riscosify_std(new_path->native_path, 0, new_native,
sizeof(new_native), NULL)) {
errno = EILSEQ;
return -1;
}
return riscos_identity_rename(old_native, new_native);
#else
return rename(old_path->native_path, new_path->native_path);
#endif
}
int platform_chmod(const ResolvedPath *path, mode_t mode) {
return path_allowed(path) ? chmod(path->native_path, mode) : -1;
}
int platform_chown(const ResolvedPath *path, uid_t uid, gid_t gid) {
return path_allowed(path) ? chown(path->native_path, uid, gid) : -1;
}
int platform_device_spec(const struct stat *st, char *buffer, size_t size) {
(void)st;
(void)buffer;
(void)size;
errno = EINVAL;
return -1;
}
int platform_set_times(const ResolvedPath *path, time_t atime, time_t mtime) {
struct utimbuf times;
if(!path_allowed(path))
return -1;
times.actime = atime;
times.modtime = mtime;
return utime(path->native_path, ×);
}
int platform_truncate(const ResolvedPath *path, off_t length) {
return path_allowed(path) ? truncate(path->native_path, length) : -1;
}
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