posix.c
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/*
* Posix-esque support routines for PhysicsFS.
*
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* Please see the file LICENSE.txt in the source's root directory.
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*
* This file written by Ryan C. Gordon.
*/
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#define __PHYSICSFS_INTERNAL__
#include "physfs_platforms.h"
#ifdef PHYSFS_PLATFORM_POSIX
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
#include <sys/stat.h>
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#include <pwd.h>
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#include <dirent.h>
#include <errno.h>
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#include <fcntl.h>
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#ifdef PHYSFS_HAVE_LLSEEK
#include <linux/unistd.h>
#endif
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#include "physfs_internal.h"
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const char *__PHYSFS_platformDirSeparator = "/";
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char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname)
{
const char *envr = getenv(varname);
char *retval = NULL;
if (envr != NULL)
{
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retval = (char *) allocator.Malloc(strlen(envr) + 1);
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if (retval != NULL)
strcpy(retval, envr);
} /* if */
return(retval);
} /* __PHYSFS_platformCopyEnvironmentVariable */
static char *getUserNameByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_name != NULL))
{
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retval = (char *) allocator.Malloc(strlen(pw->pw_name) + 1);
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if (retval != NULL)
strcpy(retval, pw->pw_name);
} /* if */
return(retval);
} /* getUserNameByUID */
static char *getUserDirByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_dir != NULL))
{
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retval = (char *) allocator.Malloc(strlen(pw->pw_dir) + 1);
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if (retval != NULL)
strcpy(retval, pw->pw_dir);
} /* if */
return(retval);
} /* getUserDirByUID */
char *__PHYSFS_platformGetUserName(void)
{
char *retval = getUserNameByUID();
if (retval == NULL)
retval = __PHYSFS_platformCopyEnvironmentVariable("USER");
return(retval);
} /* __PHYSFS_platformGetUserName */
char *__PHYSFS_platformGetUserDir(void)
{
char *retval = __PHYSFS_platformCopyEnvironmentVariable("HOME");
if (retval == NULL)
retval = getUserDirByUID();
return(retval);
} /* __PHYSFS_platformGetUserDir */
int __PHYSFS_platformExists(const char *fname)
{
struct stat statbuf;
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BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
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} /* __PHYSFS_platformExists */
int __PHYSFS_platformIsSymLink(const char *fname)
{
struct stat statbuf;
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BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
return( (S_ISLNK(statbuf.st_mode)) ? 1 : 0 );
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} /* __PHYSFS_platformIsSymlink */
int __PHYSFS_platformIsDirectory(const char *fname)
{
struct stat statbuf;
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BAIL_IF_MACRO(stat(fname, &statbuf) == -1, strerror(errno), 0);
return( (S_ISDIR(statbuf.st_mode)) ? 1 : 0 );
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} /* __PHYSFS_platformIsDirectory */
char *__PHYSFS_platformCvtToDependent(const char *prepend,
const char *dirName,
const char *append)
{
int len = ((prepend) ? strlen(prepend) : 0) +
((append) ? strlen(append) : 0) +
strlen(dirName) + 1;
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char *retval = (char *) allocator.Malloc(len);
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BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
/* platform-independent notation is Unix-style already. :) */
if (prepend)
strcpy(retval, prepend);
else
retval[0] = '\0';
strcat(retval, dirName);
if (append)
strcat(retval, append);
return(retval);
} /* __PHYSFS_platformCvtToDependent */
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void __PHYSFS_platformEnumerateFiles(const char *dirname,
int omitSymLinks,
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PHYSFS_EnumFilesCallback callback,
const char *origdir,
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void *callbackdata)
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{
DIR *dir;
struct dirent *ent;
int bufsize = 0;
char *buf = NULL;
int dlen = 0;
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if (omitSymLinks) /* !!! FIXME: this malloc sucks. */
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{
dlen = strlen(dirname);
bufsize = dlen + 256;
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buf = (char *) allocator.Malloc(bufsize);
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if (buf == NULL)
return;
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strcpy(buf, dirname);
if (buf[dlen - 1] != '/')
{
buf[dlen++] = '/';
buf[dlen] = '\0';
} /* if */
} /* if */
errno = 0;
dir = opendir(dirname);
if (dir == NULL)
{
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allocator.Free(buf);
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} /* if */
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while ((ent = readdir(dir)) != NULL)
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{
if (strcmp(ent->d_name, ".") == 0)
continue;
if (strcmp(ent->d_name, "..") == 0)
continue;
if (omitSymLinks)
{
char *p;
int len = strlen(ent->d_name) + dlen + 1;
if (len > bufsize)
{
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p = (char *) allocator.Realloc(buf, len);
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if (p == NULL)
continue;
buf = p;
bufsize = len;
} /* if */
strcpy(buf + dlen, ent->d_name);
if (__PHYSFS_platformIsSymLink(buf))
continue;
} /* if */
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callback(callbackdata, origdir, ent->d_name);
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} /* while */
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allocator.Free(buf);
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closedir(dir);
} /* __PHYSFS_platformEnumerateFiles */
int __PHYSFS_platformMkDir(const char *path)
{
int rc;
errno = 0;
rc = mkdir(path, S_IRWXU);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformMkDir */
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static void *doOpen(const char *filename, int mode)
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{
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int fd;
int *retval;
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errno = 0;
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fd = open(filename, mode, S_IRUSR | S_IWUSR);
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BAIL_IF_MACRO(fd < 0, strerror(errno), NULL);
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retval = (int *) allocator.Malloc(sizeof (int));
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if (retval == NULL)
{
close(fd);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
*retval = fd;
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return((void *) retval);
} /* doOpen */
void *__PHYSFS_platformOpenRead(const char *filename)
{
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return(doOpen(filename, O_RDONLY));
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} /* __PHYSFS_platformOpenRead */
void *__PHYSFS_platformOpenWrite(const char *filename)
{
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return(doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC));
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} /* __PHYSFS_platformOpenWrite */
void *__PHYSFS_platformOpenAppend(const char *filename)
{
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return(doOpen(filename, O_WRONLY | O_CREAT | O_APPEND));
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} /* __PHYSFS_platformOpenAppend */
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
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int fd = *((int *) opaque);
int max = size * count;
int rc = read(fd, buffer, max);
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BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
return(rc / size);
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} /* __PHYSFS_platformRead */
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
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int fd = *((int *) opaque);
int max = size * count;
int rc = write(fd, (void *) buffer, max);
BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
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return(rc / size);
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} /* __PHYSFS_platformWrite */
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
{
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int fd = *((int *) opaque);
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#ifdef PHYSFS_HAVE_LLSEEK
unsigned long offset_high = ((pos >> 32) & 0xFFFFFFFF);
unsigned long offset_low = (pos & 0xFFFFFFFF);
loff_t retoffset;
int rc = llseek(fd, offset_high, offset_low, &retoffset, SEEK_SET);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
#else
BAIL_IF_MACRO(lseek(fd, (int) pos, SEEK_SET) == -1, strerror(errno), 0);
#endif
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return(1);
} /* __PHYSFS_platformSeek */
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
{
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int fd = *((int *) opaque);
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PHYSFS_sint64 retval;
#ifdef PHYSFS_HAVE_LLSEEK
loff_t retoffset;
int rc = llseek(fd, 0, &retoffset, SEEK_CUR);
BAIL_IF_MACRO(rc == -1, strerror(errno), -1);
retval = (PHYSFS_sint64) retoffset;
#else
retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
BAIL_IF_MACRO(retval == -1, strerror(errno), -1);
#endif
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return(retval);
} /* __PHYSFS_platformTell */
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
{
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int fd = *((int *) opaque);
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struct stat statbuf;
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BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, strerror(errno), -1);
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return((PHYSFS_sint64) statbuf.st_size);
} /* __PHYSFS_platformFileLength */
int __PHYSFS_platformEOF(void *opaque)
{
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PHYSFS_sint64 pos = __PHYSFS_platformTell(opaque);
PHYSFS_sint64 len = __PHYSFS_platformFileLength(opaque);
return(pos >= len);
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} /* __PHYSFS_platformEOF */
int __PHYSFS_platformFlush(void *opaque)
{
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int fd = *((int *) opaque);
BAIL_IF_MACRO(fsync(fd) == -1, strerror(errno), 0);
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return(1);
} /* __PHYSFS_platformFlush */
int __PHYSFS_platformClose(void *opaque)
{
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int fd = *((int *) opaque);
BAIL_IF_MACRO(close(fd) == -1, strerror(errno), 0);
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allocator.Free(opaque);
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return(1);
} /* __PHYSFS_platformClose */
int __PHYSFS_platformDelete(const char *path)
{
BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformDelete */
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PHYSFS_sint64 __PHYSFS_platformGetLastModTime(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(stat(fname, &statbuf) < 0, strerror(errno), -1);
return statbuf.st_mtime;
} /* __PHYSFS_platformGetLastModTime */
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#endif /* PHYSFS_PLATFORM_POSIX */
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/* end of posix.c ... */