/*

* Unix 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

/* BeOS uses beos.cpp and posix.c ... Cygwin and such use win32.c ... */

#if ((!defined __BEOS__) && (!defined WIN32))

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include <unistd.h>

#include <sys/types.h>

#include <pwd.h>

#include <sys/stat.h>

#include <dirent.h>

#include <time.h>

#include <errno.h>

#if (!defined PHYSFS_NO_PTHREADS_SUPPORT)

#include <pthread.h>

#endif

#ifdef PHYSFS_HAVE_SYS_UCRED_H

# ifdef PHYSFS_HAVE_MNTENT_H

# undef PHYSFS_HAVE_MNTENT_H /* don't do both... */

# endif

# include <sys/ucred.h>

#ifdef PHYSFS_HAVE_MNTENT_H

#include <mntent.h>

#endif

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

const char *__PHYSFS_platformDirSeparator = "/";

int __PHYSFS_platformInit(void)

{

return(1); /* always succeed. */

} /* __PHYSFS_platformInit */

int __PHYSFS_platformDeinit(void)

{

return(1); /* always succeed. */

} /* __PHYSFS_platformDeinit */

#ifdef PHYSFS_NO_CDROM_SUPPORT

/* Stub version for platforms without CD-ROM support. */

char **__PHYSFS_platformDetectAvailableCDs(void)

{

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

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

*retval = NULL;

return(retval);

} /* __PHYSFS_platformDetectAvailableCDs */

#else

char **__PHYSFS_platformDetectAvailableCDs(void)

{

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

int cd_count = 1; /* We count the NULL entry. */

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

for (i = 0; i < mounts; i++)

{

int add_it = 0;

/* add other mount types here */

if (add_it)

{

if (tmp)

{

retval = tmp;

cd_count++;

} /* if */

} /* if */

} /* if */

retval[cd_count - 1] = NULL;

return(retval);

} /* __PHYSFS_platformDetectAvailableCDs */

char **__PHYSFS_platformDetectAvailableCDs(void)

{

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

int cd_count = 1; /* We count the NULL entry. */

FILE *mounts = NULL;

struct mntent *ent = NULL;

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

*retval = NULL;

mounts = setmntent("/etc/mtab", "r");

BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, retval);

while ( (ent = getmntent(mounts)) != NULL )

{

int add_it = 0;

if (strcmp(ent->mnt_type, "iso9660") == 0)

add_it = 1;

/* add other mount types here */

if (add_it)

{

if (tmp)

{

retval = tmp;

retval[cd_count-1] = (char *) malloc(strlen(ent->mnt_dir) + 1);

cd_count++;

} /* if */

} /* if */

} /* if */

} /* while */

endmntent(mounts);

} /* __PHYSFS_platformDetectAvailableCDs */

#endif

#endif /* !PHYSFS_NO_CDROM_SUPPORT */

/* this is in posix.c ... */

extern char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname);

/*

* See where program (bin) resides in the $PATH specified by (envr).

* returns a copy of the first element in envr that contains it, or NULL

* if it doesn't exist or there were other problems. PHYSFS_SetError() is

* called if we have a problem.

*

* (envr) will be scribbled over, and you are expected to free() the

* return value when you're done with it.

*/

static char *findBinaryInPath(const char *bin, char *envr)

size_t alloc_size = 0;

char *exe = NULL;

char *start = envr;

char *ptr;

BAIL_IF_MACRO(bin == NULL, ERR_INVALID_ARGUMENT, NULL);

BAIL_IF_MACRO(envr == NULL, ERR_INVALID_ARGUMENT, NULL);

do

{

size_t size;

ptr = strchr(start, ':'); /* find next $PATH separator. */

if (ptr)

*ptr = '\0';

size = strlen(start) + strlen(bin) + 2;

if (size > alloc_size)

char *x = (char *) realloc(exe, size);

if (x == NULL)

{

if (exe != NULL)

free(exe);

BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);

} /* if */

alloc_size = size;

exe = x;

/* build full binary path... */

strcat(exe, bin);

if (access(exe, X_OK) == 0) /* Exists as executable? We're done. */

strcpy(exe, start); /* i'm lazy. piss off. */

return(exe);

} /* if */

} while (ptr != NULL);

if (exe != NULL)

free(exe);

return(NULL); /* doesn't exist in path. */

} /* findBinaryInPath */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

/* If there isn't a path on argv0, then look through the $PATH for it. */

char *retval;

char *envr;

if (strchr(argv0, '/') != NULL) /* default behaviour can handle this. */

return(NULL);

BAIL_IF_MACRO(!envr, NULL, NULL);

retval = findBinaryInPath(argv0, envr);

free(envr);

return(retval);

} /* __PHYSFS_platformCalcBaseDir */

/* Much like my college days, try to sleep for 10 milliseconds at a time... */

void __PHYSFS_platformTimeslice(void)

{

} /* __PHYSFS_platformTimeslice */

#if defined(__MACH__) && defined(__APPLE__)

/*

* This function is only for OSX. The problem is that Apple's applications

* can actually be directory structures with the actual executable nested

* several levels down. PhysFS computes the base directory from the Unix

* executable, but this may not be the correct directory. Apple tries to

* hide everything from the user, so from Finder, the user never sees the

* Unix executable, and the directory package (bundle) is considered the

* "executable". This means that the correct base directory is at the

* level where the directory structure starts.

* A typical bundle seems to look like this:

* MyApp.app/ <-- top level...this is what the user sees in Finder

* Contents/

* MacOS/

* MyApp <-- the actual executable

*

* Since anything below the app folder is considered hidden, most

* application files need to be at the top level if you intend to

* write portable software. Thus if the application resides in:

* /Applications/MyProgram

* and the executable is the bundle MyApp.app,

* PhysFS computes the following as the base directory:

* /Applications/MyProgram/MyApp.app/Contents/MacOS/

* We need to strip off the MyApp.app/Contents/MacOS/

*

* However, there are corner cases. OSX applications can be traditional

* Unix executables without the bundle. Also, it is not entirely clear

* to me what kinds of permutations bundle structures can have.

*

* For now, this is a temporary hack until a better solution

* can be made. This function will try to find a "/Contents/MacOS"

* inside the path. If it succeeds, then the path will be truncated

* to correct the directory. If it is not found, the path will be

* left alone and will presume it is a traditional Unix execuatable.

* Most programs also include the .app extention in the top level

* folder, but it doesn't seem to be a requirement (Acrobat doesn't

* have it). MacOS looks like it can also be MacOSClassic.

* This function will test for MacOS and hope it captures any

* other permutations.

*/

static void stripAppleBundle(char *path)

{

char *sub_str = "/contents/macos";

char *found_ptr = NULL;

char *tempbuf = NULL;

int i;

/* Calloc will place the \0 character in the proper place for us */

tempbuf = (char*)calloc( (strlen(path)+1), sizeof(char) );

/* Unlike other Unix filesystems, HFS is case insensitive

* It wouldn be nice to use strcasestr, but it doesn't seem

* to be available in the OSX gcc library right now.

* So we should make a lower case copy of the path to

* compare against

*/

for(i=0; i<strlen(path); i++)

{

/* convert to lower case */

tempbuf[i] = tolower(path[i]);

}

/* See if we can find "/contents/macos" in the path */

found_ptr = strstr(tempbuf, sub_str);

if(NULL == found_ptr)

{

/* It doesn't look like a bundle so we can keep the

* original path. Just return */

free(tempbuf);

return;

}

/* We have a bundle, so let's backstep character by character

* to erase the extra parts of the path. Quit when we hit

* the preceding '/' character.

*/

for(i=strlen(path)-strlen(found_ptr)-1; i>=0; i--)

{

if('/' == path[i])

{

break;

}

}

/* Safety check */

if(i<1)

{

/* This probably shouldn't happen. */

path[0] = '\0';

}

else

{

/* Back up one more to remove trailing '/' and set the '\0' */

path[i] = '\0';

}

free(tempbuf);

return;

}

#endif /* defined __MACH__ && defined __APPLE__ */

char *__PHYSFS_platformRealPath(const char *path)

{

char resolved_path[MAXPATHLEN];

char *retval = NULL;

errno = 0;

BAIL_IF_MACRO(!realpath(path, resolved_path), strerror(errno), NULL);

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

strcpy(retval, resolved_path);

#if defined(__MACH__) && defined(__APPLE__)

stripAppleBundle(retval);

#endif /* defined __MACH__ && defined __APPLE__ */

return(retval);

} /* __PHYSFS_platformRealPath */

PHYSFS_uint64 __PHYSFS_platformGetThreadID(void) { return(0x0001); }

void *__PHYSFS_platformCreateMutex(void) { return((void *) 0x0001); }

void __PHYSFS_platformDestroyMutex(void *mutex) {}

int __PHYSFS_platformGrabMutex(void *mutex) { return(1); }

void __PHYSFS_platformReleaseMutex(void *mutex) {}

#else

/* Just in case; this is a panic value. */

#if ((!defined SIZEOF_INT) || (SIZEOF_INT <= 0))

# define SIZEOF_INT 4

#endif

#if (SIZEOF_INT == 4)

# define PHTREAD_TO_UI64(thr) ( (PHYSFS_uint64) ((PHYSFS_uint32) (thr)) )

#elif (SIZEOF_INT == 2)

# define PHTREAD_TO_UI64(thr) ( (PHYSFS_uint64) ((PHYSFS_uint16) (thr)) )

#elif (SIZEOF_INT == 1)

# define PHTREAD_TO_UI64(thr) ( (PHYSFS_uint64) ((PHYSFS_uint8) (thr)) )

#else

# define PHTREAD_TO_UI64(thr) ((PHYSFS_uint64) (thr))

#endif

PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)

{

} /* __PHYSFS_platformGetThreadID */

void *__PHYSFS_platformCreateMutex(void)

{

int rc;

pthread_mutex_t *m = (pthread_mutex_t *) malloc(sizeof (pthread_mutex_t));

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

rc = pthread_mutex_init(m, NULL);

if (rc != 0)

{

free(m);

BAIL_MACRO(strerror(rc), NULL);

} /* if */

return((void *) m);

} /* __PHYSFS_platformCreateMutex */

void __PHYSFS_platformDestroyMutex(void *mutex)

{

pthread_mutex_destroy((pthread_mutex_t *) mutex);

free(mutex);

} /* __PHYSFS_platformDestroyMutex */

int __PHYSFS_platformGrabMutex(void *mutex)

{

return(pthread_mutex_lock((pthread_mutex_t *) mutex) == 0);

} /* __PHYSFS_platformGrabMutex */

void __PHYSFS_platformReleaseMutex(void *mutex)

{

pthread_mutex_unlock((pthread_mutex_t *) mutex);

} /* __PHYSFS_platformReleaseMutex */

#endif /* !PHYSFS_NO_PTHREADS_SUPPORT */