dir.c
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/*
* Standard directory I/O support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <errno.h>
#include <fcntl.h>
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#include "physfs.h"
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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static int DIR_read(FileHandle *handle, void *buffer,
unsigned int objSize, unsigned int objCount);
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static int DIR_write(FileHandle *handle, const void *buffer,
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unsigned int objSize, unsigned int objCount);
static int DIR_eof(FileHandle *handle);
static int DIR_tell(FileHandle *handle);
static int DIR_seek(FileHandle *handle, int offset);
static int DIR_fileLength(FileHandle *handle);
static int DIR_fileClose(FileHandle *handle);
static int DIR_isArchive(const char *filename, int forWriting);
static DirHandle *DIR_openArchive(const char *name, int forWriting);
static LinkedStringList *DIR_enumerateFiles(DirHandle *h,
const char *dname,
int omitSymLinks);
static int DIR_exists(DirHandle *h, const char *name);
static int DIR_isDirectory(DirHandle *h, const char *name);
static int DIR_isSymLink(DirHandle *h, const char *name);
static FileHandle *DIR_openRead(DirHandle *h, const char *filename);
static FileHandle *DIR_openWrite(DirHandle *h, const char *filename);
static FileHandle *DIR_openAppend(DirHandle *h, const char *filename);
static int DIR_remove(DirHandle *h, const char *name);
static int DIR_mkdir(DirHandle *h, const char *name);
static void DIR_dirClose(DirHandle *h);
static const FileFunctions __PHYSFS_FileFunctions_DIR =
{
DIR_read, /* read() method */
NULL, /* write() method */
DIR_eof, /* eof() method */
DIR_tell, /* tell() method */
DIR_seek, /* seek() method */
DIR_fileLength, /* fileLength() method */
DIR_fileClose /* fileClose() method */
};
static const FileFunctions __PHYSFS_FileFunctions_DIRW =
{
NULL, /* read() method */
DIR_write, /* write() method */
DIR_eof, /* eof() method */
DIR_tell, /* tell() method */
DIR_seek, /* seek() method */
DIR_fileLength, /* fileLength() method */
DIR_fileClose /* fileClose() method */
};
const DirFunctions __PHYSFS_DirFunctions_DIR =
{
DIR_isArchive, /* isArchive() method */
DIR_openArchive, /* openArchive() method */
DIR_enumerateFiles, /* enumerateFiles() method */
DIR_exists, /* exists() method */
DIR_isDirectory, /* isDirectory() method */
DIR_isSymLink, /* isSymLink() method */
DIR_openRead, /* openRead() method */
DIR_openWrite, /* openWrite() method */
DIR_openAppend, /* openAppend() method */
DIR_remove, /* remove() method */
DIR_mkdir, /* mkdir() method */
DIR_dirClose /* dirClose() method */
};
/* This doesn't get listed, since it's technically not an archive... */
#if 0
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_DIR =
{
"DIR",
"non-archive directory I/O",
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"Ryan C. Gordon <icculus@clutteredmind.org>",
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"http://www.icculus.org/physfs/",
};
#endif
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static int DIR_read(FileHandle *handle, void *buffer,
unsigned int objSize, unsigned int objCount)
{
FILE *h = (FILE *) (handle->opaque);
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size_t retval;
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errno = 0;
retval = fread(buffer, objSize, objCount, h);
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BAIL_IF_MACRO((retval < (size_t) objCount) && (ferror(h)),
strerror(errno), (int) retval);
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return((int) retval);
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} /* DIR_read */
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static int DIR_write(FileHandle *handle, const void *buffer,
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unsigned int objSize, unsigned int objCount)
{
FILE *h = (FILE *) (handle->opaque);
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size_t retval;
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retval = fwrite(buffer, (size_t) objSize, objCount, h);
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if ( (retval < (signed int) objCount) && (ferror(h)) )
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__PHYSFS_setError(strerror(errno));
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return((int) retval);
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} /* DIR_write */
static int DIR_eof(FileHandle *handle)
{
return(feof((FILE *) (handle->opaque)));
} /* DIR_eof */
static int DIR_tell(FileHandle *handle)
{
return(ftell((FILE *) (handle->opaque)));
} /* DIR_tell */
static int DIR_seek(FileHandle *handle, int offset)
{
return(fseek((FILE *) (handle->opaque), offset, SEEK_SET) == 0);
} /* DIR_seek */
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static int DIR_fileLength(FileHandle *handle)
{
return(__PHYSFS_platformFileLength((FILE *) (handle->opaque)));
} /* DIR_fileLength */
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static int DIR_fileClose(FileHandle *handle)
{
FILE *h = (FILE *) (handle->opaque);
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/*
* we manually fflush() the buffer, since that's the place fclose() will
* most likely fail, but that will leave the file handle in an undefined
* state if it fails. fflush() failures we can recover from.
*/
/* keep trying until there's success or an unrecoverable error... */
do {
__PHYSFS_platformTimeslice();
errno = 0;
} while ( (fflush(h) == EOF) && ((errno == EAGAIN) || (errno == EINTR)) );
/* EBADF == "Not open for writing". That's fine. */
BAIL_IF_MACRO((errno != 0) && (errno != EBADF), strerror(errno), 0);
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/* if fclose fails anyhow, we just have to pray that it's still usable. */
errno = 0;
BAIL_IF_MACRO(fclose(h) == EOF, strerror(errno), 0); /* (*shrug*) */
free(handle);
return(1);
} /* DIR_fileClose */
static int DIR_isArchive(const char *filename, int forWriting)
{
/* directories ARE archives in this driver... */
return(__PHYSFS_platformIsDirectory(filename));
} /* DIR_isArchive */
static DirHandle *DIR_openArchive(const char *name, int forWriting)
{
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const char *dirsep = PHYSFS_getDirSeparator();
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DirHandle *retval = NULL;
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size_t namelen = strlen(name);
size_t seplen = strlen(dirsep);
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BAIL_IF_MACRO(!DIR_isArchive(name, forWriting),
ERR_UNSUPPORTED_ARCHIVE, NULL);
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retval = (DirHandle *) malloc(sizeof (DirHandle));
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
retval->opaque = malloc(namelen + seplen + 1);
if (retval->opaque == NULL)
{
free(retval);
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BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
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} /* if */
/* make sure there's a dir separator at the end of the string */
strcpy((char *) (retval->opaque), name);
if (strcmp((name + namelen) - seplen, dirsep) != 0)
strcat((char *) (retval->opaque), dirsep);
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retval->funcs = &__PHYSFS_DirFunctions_DIR;
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return(retval);
} /* DIR_openArchive */
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static LinkedStringList *DIR_enumerateFiles(DirHandle *h,
const char *dname,
int omitSymLinks)
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{
char *d = __PHYSFS_platformCvtToDependent((char *)(h->opaque),dname,NULL);
LinkedStringList *retval;
BAIL_IF_MACRO(d == NULL, NULL, NULL);
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retval = __PHYSFS_platformEnumerateFiles(d, omitSymLinks);
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free(d);
return(retval);
} /* DIR_enumerateFiles */
static int DIR_exists(DirHandle *h, const char *name)
{
char *f = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
int retval;
BAIL_IF_MACRO(f == NULL, NULL, 0);
retval = __PHYSFS_platformExists(f);
free(f);
return(retval);
} /* DIR_exists */
static int DIR_isDirectory(DirHandle *h, const char *name)
{
char *d = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
int retval;
BAIL_IF_MACRO(d == NULL, NULL, 0);
retval = __PHYSFS_platformIsDirectory(d);
free(d);
return(retval);
} /* DIR_isDirectory */
static int DIR_isSymLink(DirHandle *h, const char *name)
{
char *f = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
int retval;
BAIL_IF_MACRO(f == NULL, NULL, 0); /* !!! might be a problem. */
retval = __PHYSFS_platformIsSymLink(f);
free(f);
return(retval);
} /* DIR_isSymLink */
static FileHandle *doOpen(DirHandle *h, const char *name, const char *mode)
{
char *f = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
FILE *rc;
FileHandle *retval;
char *str;
BAIL_IF_MACRO(f == NULL, NULL, NULL);
retval = (FileHandle *) malloc(sizeof (FileHandle));
if (!retval)
{
free(f);
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BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
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} /* if */
errno = 0;
rc = fopen(f, mode);
str = strerror(errno);
free(f);
if (!rc)
{
free(retval);
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BAIL_IF_MACRO(1, str, NULL);
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} /* if */
retval->opaque = (void *) rc;
retval->dirHandle = h;
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retval->funcs = (mode[0] == 'r') ?
&__PHYSFS_FileFunctions_DIR : &__PHYSFS_FileFunctions_DIRW;
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return(retval);
} /* doOpen */
static FileHandle *DIR_openRead(DirHandle *h, const char *filename)
{
return(doOpen(h, filename, "rb"));
} /* DIR_openRead */
static FileHandle *DIR_openWrite(DirHandle *h, const char *filename)
{
return(doOpen(h, filename, "wb"));
} /* DIR_openWrite */
static FileHandle *DIR_openAppend(DirHandle *h, const char *filename)
{
return(doOpen(h, filename, "ab"));
} /* DIR_openAppend */
static int DIR_remove(DirHandle *h, const char *name)
{
char *f = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
int retval;
BAIL_IF_MACRO(f == NULL, NULL, 0);
errno = 0;
retval = (remove(f) == 0);
if (!retval)
__PHYSFS_setError(strerror(errno));
free(f);
return(retval);
} /* DIR_remove */
static int DIR_mkdir(DirHandle *h, const char *name)
{
char *f = __PHYSFS_platformCvtToDependent((char *)(h->opaque), name, NULL);
int retval;
BAIL_IF_MACRO(f == NULL, NULL, 0);
errno = 0;
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retval = __PHYSFS_platformMkDir(f);
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if (!retval)
__PHYSFS_setError(strerror(errno));
free(f);
return(retval);
} /* DIR_mkdir */
static void DIR_dirClose(DirHandle *h)
{
free(h->opaque);
free(h);
} /* DIR_dirClose */
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/* end of dir.c ... */