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VVVVVV/desktop_version/physfs/physfs_platform_posix.c
Ethan Lee f7c0321b71 Hello WWWWWWorld!
2020-01-08 10:37:50 -05:00

417 lines
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/*
* Posix-esque support routines for PhysicsFS.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
/* !!! FIXME: check for EINTR? */
#define __PHYSICSFS_INTERNAL__
#include "physfs_platforms.h"
#ifdef PHYSFS_PLATFORM_POSIX
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include "physfs_internal.h"
static PHYSFS_ErrorCode errcodeFromErrnoError(const int err)
{
switch (err)
{
case 0: return PHYSFS_ERR_OK;
case EACCES: return PHYSFS_ERR_PERMISSION;
case EPERM: return PHYSFS_ERR_PERMISSION;
case EDQUOT: return PHYSFS_ERR_NO_SPACE;
case EIO: return PHYSFS_ERR_IO;
case ELOOP: return PHYSFS_ERR_SYMLINK_LOOP;
case EMLINK: return PHYSFS_ERR_NO_SPACE;
case ENAMETOOLONG: return PHYSFS_ERR_BAD_FILENAME;
case ENOENT: return PHYSFS_ERR_NOT_FOUND;
case ENOSPC: return PHYSFS_ERR_NO_SPACE;
case ENOTDIR: return PHYSFS_ERR_NOT_FOUND;
case EISDIR: return PHYSFS_ERR_NOT_A_FILE;
case EROFS: return PHYSFS_ERR_READ_ONLY;
case ETXTBSY: return PHYSFS_ERR_BUSY;
case EBUSY: return PHYSFS_ERR_BUSY;
case ENOMEM: return PHYSFS_ERR_OUT_OF_MEMORY;
case ENOTEMPTY: return PHYSFS_ERR_DIR_NOT_EMPTY;
default: return PHYSFS_ERR_OS_ERROR;
} /* switch */
} /* errcodeFromErrnoError */
static inline PHYSFS_ErrorCode errcodeFromErrno(void)
{
return errcodeFromErrnoError(errno);
} /* errcodeFromErrno */
static char *getUserDirByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_dir != NULL) && (*pw->pw_dir != '\0'))
{
const size_t dlen = strlen(pw->pw_dir);
const size_t add_dirsep = (pw->pw_dir[dlen-1] != '/') ? 1 : 0;
retval = (char *) allocator.Malloc(dlen + 1 + add_dirsep);
if (retval != NULL)
{
strcpy(retval, pw->pw_dir);
if (add_dirsep)
{
retval[dlen] = '/';
retval[dlen+1] = '\0';
} /* if */
} /* if */
} /* if */
return retval;
} /* getUserDirByUID */
char *__PHYSFS_platformCalcUserDir(void)
{
char *retval = NULL;
char *envr = getenv("HOME");
/* if the environment variable was set, make sure it's really a dir. */
if (envr != NULL)
{
struct stat statbuf;
if ((stat(envr, &statbuf) != -1) && (S_ISDIR(statbuf.st_mode)))
{
const size_t envrlen = strlen(envr);
const size_t add_dirsep = (envr[envrlen-1] != '/') ? 1 : 0;
retval = allocator.Malloc(envrlen + 1 + add_dirsep);
if (retval)
{
strcpy(retval, envr);
if (add_dirsep)
{
retval[envrlen] = '/';
retval[envrlen+1] = '\0';
} /* if */
} /* if */
} /* if */
} /* if */
if (retval == NULL)
retval = getUserDirByUID();
return retval;
} /* __PHYSFS_platformCalcUserDir */
PHYSFS_EnumerateCallbackResult __PHYSFS_platformEnumerate(const char *dirname,
PHYSFS_EnumerateCallback callback,
const char *origdir, void *callbackdata)
{
DIR *dir;
struct dirent *ent;
PHYSFS_EnumerateCallbackResult retval = PHYSFS_ENUM_OK;
dir = opendir(dirname);
BAIL_IF(dir == NULL, errcodeFromErrno(), PHYSFS_ENUM_ERROR);
while ((retval == PHYSFS_ENUM_OK) && ((ent = readdir(dir)) != NULL))
{
const char *name = ent->d_name;
if (name[0] == '.') /* ignore "." and ".." */
{
if ((name[1] == '\0') || ((name[1] == '.') && (name[2] == '\0')))
continue;
} /* if */
retval = callback(callbackdata, origdir, name);
if (retval == PHYSFS_ENUM_ERROR)
PHYSFS_setErrorCode(PHYSFS_ERR_APP_CALLBACK);
} /* while */
closedir(dir);
return retval;
} /* __PHYSFS_platformEnumerate */
int __PHYSFS_platformMkDir(const char *path)
{
const int rc = mkdir(path, S_IRWXU);
BAIL_IF(rc == -1, errcodeFromErrno(), 0);
return 1;
} /* __PHYSFS_platformMkDir */
static void *doOpen(const char *filename, int mode)
{
const int appending = (mode & O_APPEND);
int fd;
int *retval;
errno = 0;
/* O_APPEND doesn't actually behave as we'd like. */
mode &= ~O_APPEND;
fd = open(filename, mode, S_IRUSR | S_IWUSR);
BAIL_IF(fd < 0, errcodeFromErrno(), NULL);
if (appending)
{
if (lseek(fd, 0, SEEK_END) < 0)
{
const int err = errno;
close(fd);
BAIL(errcodeFromErrnoError(err), NULL);
} /* if */
} /* if */
retval = (int *) allocator.Malloc(sizeof (int));
if (!retval)
{
close(fd);
BAIL(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
} /* if */
*retval = fd;
return ((void *) retval);
} /* doOpen */
void *__PHYSFS_platformOpenRead(const char *filename)
{
return doOpen(filename, O_RDONLY);
} /* __PHYSFS_platformOpenRead */
void *__PHYSFS_platformOpenWrite(const char *filename)
{
return doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC);
} /* __PHYSFS_platformOpenWrite */
void *__PHYSFS_platformOpenAppend(const char *filename)
{
return doOpen(filename, O_WRONLY | O_CREAT | O_APPEND);
} /* __PHYSFS_platformOpenAppend */
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
PHYSFS_uint64 len)
{
const int fd = *((int *) opaque);
ssize_t rc = 0;
if (!__PHYSFS_ui64FitsAddressSpace(len))
BAIL(PHYSFS_ERR_INVALID_ARGUMENT, -1);
rc = read(fd, buffer, (size_t) len);
BAIL_IF(rc == -1, errcodeFromErrno(), -1);
assert(rc >= 0);
assert(rc <= len);
return (PHYSFS_sint64) rc;
} /* __PHYSFS_platformRead */
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
PHYSFS_uint64 len)
{
const int fd = *((int *) opaque);
ssize_t rc = 0;
if (!__PHYSFS_ui64FitsAddressSpace(len))
BAIL(PHYSFS_ERR_INVALID_ARGUMENT, -1);
rc = write(fd, (void *) buffer, (size_t) len);
BAIL_IF(rc == -1, errcodeFromErrno(), rc);
assert(rc >= 0);
assert(rc <= len);
return (PHYSFS_sint64) rc;
} /* __PHYSFS_platformWrite */
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
{
const int fd = *((int *) opaque);
const off_t rc = lseek(fd, (off_t) pos, SEEK_SET);
BAIL_IF(rc == -1, errcodeFromErrno(), 0);
return 1;
} /* __PHYSFS_platformSeek */
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
{
const int fd = *((int *) opaque);
PHYSFS_sint64 retval;
retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
BAIL_IF(retval == -1, errcodeFromErrno(), -1);
return retval;
} /* __PHYSFS_platformTell */
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
{
const int fd = *((int *) opaque);
struct stat statbuf;
BAIL_IF(fstat(fd, &statbuf) == -1, errcodeFromErrno(), -1);
return ((PHYSFS_sint64) statbuf.st_size);
} /* __PHYSFS_platformFileLength */
int __PHYSFS_platformFlush(void *opaque)
{
const int fd = *((int *) opaque);
if ((fcntl(fd, F_GETFL) & O_ACCMODE) != O_RDONLY)
BAIL_IF(fsync(fd) == -1, errcodeFromErrno(), 0);
return 1;
} /* __PHYSFS_platformFlush */
void __PHYSFS_platformClose(void *opaque)
{
const int fd = *((int *) opaque);
(void) close(fd); /* we don't check this. You should have used flush! */
allocator.Free(opaque);
} /* __PHYSFS_platformClose */
int __PHYSFS_platformDelete(const char *path)
{
BAIL_IF(remove(path) == -1, errcodeFromErrno(), 0);
return 1;
} /* __PHYSFS_platformDelete */
int __PHYSFS_platformStat(const char *fname, PHYSFS_Stat *st, const int follow)
{
struct stat statbuf;
const int rc = follow ? stat(fname, &statbuf) : lstat(fname, &statbuf);
BAIL_IF(rc == -1, errcodeFromErrno(), 0);
if (S_ISREG(statbuf.st_mode))
{
st->filetype = PHYSFS_FILETYPE_REGULAR;
st->filesize = statbuf.st_size;
} /* if */
else if(S_ISDIR(statbuf.st_mode))
{
st->filetype = PHYSFS_FILETYPE_DIRECTORY;
st->filesize = 0;
} /* else if */
else if(S_ISLNK(statbuf.st_mode))
{
st->filetype = PHYSFS_FILETYPE_SYMLINK;
st->filesize = 0;
} /* else if */
else
{
st->filetype = PHYSFS_FILETYPE_OTHER;
st->filesize = statbuf.st_size;
} /* else */
st->modtime = statbuf.st_mtime;
st->createtime = statbuf.st_ctime;
st->accesstime = statbuf.st_atime;
st->readonly = (access(fname, W_OK) == -1);
return 1;
} /* __PHYSFS_platformStat */
typedef struct
{
pthread_mutex_t mutex;
pthread_t owner;
PHYSFS_uint32 count;
} PthreadMutex;
void *__PHYSFS_platformGetThreadID(void)
{
return ( (void *) ((size_t) pthread_self()) );
} /* __PHYSFS_platformGetThreadID */
void *__PHYSFS_platformCreateMutex(void)
{
int rc;
PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));
BAIL_IF(!m, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
rc = pthread_mutex_init(&m->mutex, NULL);
if (rc != 0)
{
allocator.Free(m);
BAIL(PHYSFS_ERR_OS_ERROR, NULL);
} /* if */
m->count = 0;
m->owner = (pthread_t) 0xDEADBEEF;
return ((void *) m);
} /* __PHYSFS_platformCreateMutex */
void __PHYSFS_platformDestroyMutex(void *mutex)
{
PthreadMutex *m = (PthreadMutex *) mutex;
/* Destroying a locked mutex is a bug, but we'll try to be helpful. */
if ((m->owner == pthread_self()) && (m->count > 0))
pthread_mutex_unlock(&m->mutex);
pthread_mutex_destroy(&m->mutex);
allocator.Free(m);
} /* __PHYSFS_platformDestroyMutex */
int __PHYSFS_platformGrabMutex(void *mutex)
{
PthreadMutex *m = (PthreadMutex *) mutex;
pthread_t tid = pthread_self();
if (m->owner != tid)
{
if (pthread_mutex_lock(&m->mutex) != 0)
return 0;
m->owner = tid;
} /* if */
m->count++;
return 1;
} /* __PHYSFS_platformGrabMutex */
void __PHYSFS_platformReleaseMutex(void *mutex)
{
PthreadMutex *m = (PthreadMutex *) mutex;
assert(m->owner == pthread_self()); /* catch programming errors. */
assert(m->count > 0); /* catch programming errors. */
if (m->owner == pthread_self())
{
if (--m->count == 0)
{
m->owner = (pthread_t) 0xDEADBEEF;
pthread_mutex_unlock(&m->mutex);
} /* if */
} /* if */
} /* __PHYSFS_platformReleaseMutex */
#endif /* PHYSFS_PLATFORM_POSIX */
/* end of physfs_platform_posix.c ... */
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