/*

* Posix-esque support routines for PhysicsFS.

*

* Please see the file LICENSE in the source's root directory.

*

* This file written by Ryan C. Gordon.

*/

#if HAVE_CONFIG_H

# include <config.h>

#endif

#if (!defined WIN32)

#if (defined __STRICT_ANSI__)

#define __PHYSFS_DOING_STRICT_ANSI__

#endif

/*

* We cheat a little: I want the symlink version of stat() (lstat), and

* GCC/Linux will not declare it if compiled with the -ansi flag.

* If you are really lacking symlink support on your platform,

* you should #define __PHYSFS_NO_SYMLINKS__ before compiling this

* file. That will open a security hole, though, if you really DO have

* symlinks on your platform; it renders PHYSFS_permitSymbolicLinks(0)

* useless, since every symlink will be reported as a regular file/dir.

*/

#if (defined __PHYSFS_DOING_STRICT_ANSI__)

#undef __STRICT_ANSI__

#endif

#include <stdio.h>

#if (defined __PHYSFS_DOING_STRICT_ANSI__)

#define __STRICT_ANSI__

#endif

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <dirent.h>

#include <errno.h>

#ifdef PHYSFS_HAVE_LLSEEK

#include <linux/unistd.h>

#endif

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname)

{

const char *envr = getenv(varname);

char *retval = NULL;

if (envr != NULL)

{

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))

{

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))

{

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 */

/* -ansi and -pedantic flags prevent use of strcasecmp() on Linux. */

int __PHYSFS_platformStricmp(const char *x, const char *y)

{

int ux, uy;

do

{

ux = toupper((int) *x);

uy = toupper((int) *y);

if (ux > uy)

return(1);

else if (ux < uy)

return(-1);

x++;

y++;

} while ((ux) && (uy));

return(0);

} /* __PHYSFS_platformStricmp */

#if (defined __PHYSFS_NO_SYMLINKS__)

#define doStat stat

#else

#define doStat lstat

#endif

int __PHYSFS_platformExists(const char *fname)

{

struct stat statbuf;

BAIL_IF_MACRO(doStat(fname, &statbuf) == -1, strerror(errno), 0);

return(1);

} /* __PHYSFS_platformExists */

int __PHYSFS_platformIsSymLink(const char *fname)

{

#if (defined __PHYSFS_NO_SYMLINKS__)

return(0);

#else

struct stat statbuf;

BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);

return( (S_ISLNK(statbuf.st_mode)) ? 1 : 0 );

#endif

} /* __PHYSFS_platformIsSymlink */

int __PHYSFS_platformIsDirectory(const char *fname)

{

struct stat statbuf;

BAIL_IF_MACRO(stat(fname, &statbuf) == -1, strerror(errno), 0);

return( (S_ISDIR(statbuf.st_mode)) ? 1 : 0 );

} /* __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;

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 */

LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname,

int omitSymLinks)

{

DIR *dir;

struct dirent *ent;

int bufsize = 0;

char *buf = NULL;

int dlen = 0;

if (omitSymLinks)

{

dlen = strlen(dirname);

bufsize = dlen + 256;

BAIL_IF_MACRO(buf == NULL, ERR_OUT_OF_MEMORY, NULL);

strcpy(buf, dirname);

if (buf[dlen - 1] != '/')

{

buf[dlen++] = '/';

buf[dlen] = '\0';

} /* if */

} /* if */

errno = 0;

dir = opendir(dirname);

if (dir == NULL)

{

if (buf != NULL)

free(buf);

BAIL_IF_MACRO(1, strerror(errno), NULL);

} /* if */

{

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)

{

p = realloc(buf, len);

if (p == NULL)

continue;

buf = p;

bufsize = len;

} /* if */

strcpy(buf + dlen, ent->d_name);

if (__PHYSFS_platformIsSymLink(buf))

continue;

} /* if */

} /* while */

if (buf != NULL)

free(buf);

closedir(dir);

return(retval);

} /* __PHYSFS_platformEnumerateFiles */

char *__PHYSFS_platformCurrentDir(void)

{

int allocSize = 0;

char *retval = NULL;

char *ptr;

do

{

allocSize += 100;

ptr = (char *) realloc(retval, allocSize);

if (ptr == NULL)

{

if (retval != NULL)

free(retval);

BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);

} /* if */

retval = ptr;

ptr = getcwd(retval, allocSize);

} while (ptr == NULL && errno == ERANGE);

if (ptr == NULL && errno)

{

/*

* getcwd() failed for some reason, for example current

* directory not existing.

*/

if (retval != NULL)

free(retval);

BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);

} /* if */

return(retval);

} /* __PHYSFS_platformCurrentDir */

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 */

int fd;

int *retval;

errno = 0;

retval = (int *) malloc(sizeof (int));

if (retval == NULL)

{

close(fd);

BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);

} /* if */

*retval = fd;

return((void *) retval);

} /* doOpen */

void *__PHYSFS_platformOpenRead(const char *filename)

{

} /* __PHYSFS_platformOpenRead */

void *__PHYSFS_platformOpenWrite(const char *filename)

{

} /* __PHYSFS_platformOpenWrite */

void *__PHYSFS_platformOpenAppend(const char *filename)

{

} /* __PHYSFS_platformOpenAppend */

PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,

PHYSFS_uint32 size, PHYSFS_uint32 count)

{

int fd = *((int *) opaque);

int max = size * count;

int rc = read(fd, 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. */

return(rc / size);

} /* __PHYSFS_platformRead */

PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,

PHYSFS_uint32 size, PHYSFS_uint32 count)

{

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. */

} /* __PHYSFS_platformWrite */

int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)

{

#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

return(1);

} /* __PHYSFS_platformSeek */

PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)

{

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

return(retval);

} /* __PHYSFS_platformTell */

PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)

{

return((PHYSFS_sint64) statbuf.st_size);

} /* __PHYSFS_platformFileLength */

int __PHYSFS_platformEOF(void *opaque)

{

PHYSFS_sint64 pos = __PHYSFS_platformTell(opaque);

PHYSFS_sint64 len = __PHYSFS_platformFileLength(opaque);

return(pos >= len);

} /* __PHYSFS_platformEOF */

int __PHYSFS_platformFlush(void *opaque)

{

int fd = *((int *) opaque);

BAIL_IF_MACRO(fsync(fd) == -1, strerror(errno), 0);

return(1);

} /* __PHYSFS_platformFlush */

int __PHYSFS_platformClose(void *opaque)

{

int fd = *((int *) opaque);

BAIL_IF_MACRO(close(fd) == -1, strerror(errno), 0);

return(1);

} /* __PHYSFS_platformClose */

int __PHYSFS_platformDelete(const char *path)

{

BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);

return(1);

} /* __PHYSFS_platformDelete */

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 */

#endif /* !defined WIN32 */