/*

* Unix support routines for PhysicsFS.

*

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

*

* This file written by Ryan C. Gordon.

*/

#define __PHYSICSFS_INTERNAL__

#include "physfs_platforms.h"

#ifdef PHYSFS_PLATFORM_UNIX

#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 <sys/param.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/mount.h>

# include <sys/ucred.h>

#endif

#ifdef PHYSFS_HAVE_MNTENT_H

#include <mntent.h>

#endif

#ifdef PHYSFS_HAVE_SYS_MNTTAB_H

#include <sys/mnttab.h>

#endif

#include "physfs_internal.h"

int __PHYSFS_platformInit(void)

{

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

} /* __PHYSFS_platformInit */

int __PHYSFS_platformDeinit(void)

{

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

} /* __PHYSFS_platformDeinit */

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

void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)

{

#if (defined PHYSFS_NO_CDROM_SUPPORT)

/* no-op. */

#elif (defined PHYSFS_HAVE_SYS_UCRED_H)

int i;

struct statfs *mntbufp = NULL;

int mounts = getmntinfo(&mntbufp, MNT_WAIT);

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

{

int add_it = 0;

if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0)

add_it = 1;

else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0)

add_it = 1;

/* add other mount types here */

if (add_it)

cb(data, mntbufp[i].f_mntonname);

} /* for */

#elif (defined PHYSFS_HAVE_MNTENT_H)

FILE *mounts = NULL;

struct mntent *ent = NULL;

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

BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);

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)

cb(data, ent->mnt_dir);

} /* while */

endmntent(mounts);

#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H)

FILE *mounts = fopen(MNTTAB, "r");

struct mnttab ent;

BAIL_IF_MACRO(mounts == NULL, ERR_IO_ERROR, /*return void*/);

while (getmntent(mounts, &ent) == 0)

{

int add_it = 0;

if (strcmp(ent.mnt_fstype, "hsfs") == 0)

add_it = 1;

/* add other mount types here */

if (add_it)

cb(data, ent.mnt_mountp);

} /* while */

fclose(mounts);

#else

#error Unknown platform. Should have defined PHYSFS_NO_CDROM_SUPPORT, perhaps.

#endif

} /* __PHYSFS_platformDetectAvailableCDs */

/* 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 allocator.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 *) allocator.Realloc(exe, size);

if (x == NULL)

{

if (exe != NULL)

allocator.Free(exe);

BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);

} /* if */

alloc_size = size;

exe = x;

} /* if */

/* build full binary path... */

strcpy(exe, start);

if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))

strcat(exe, "/");

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 */

start = ptr + 1; /* start points to beginning of next element. */

} while (ptr != NULL);

if (exe != NULL)

allocator.Free(exe);

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

} /* findBinaryInPath */

static char *readSymLink(const char *path)

{

ssize_t len = 64;

ssize_t rc = -1;

char *retval = NULL;

while (1)

{

char *ptr = (char *) allocator.Realloc(retval, (size_t) len);

if (ptr == NULL)

break; /* out of memory. */

retval = ptr;

rc = readlink(path, retval, len);

if (rc == -1)

break; /* not a symlink, i/o error, etc. */

else if (rc < len)

{

retval[rc] = '\0'; /* readlink doesn't null-terminate. */

return retval; /* we're good to go. */

} /* else if */

len *= 2; /* grow buffer, try again. */

} /* while */

if (retval != NULL)

allocator.Free(retval);

return NULL;

} /* readSymLink */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

char *retval = NULL;

char *envr = NULL;

/* fast path: default behaviour can handle this. */

if ( (argv0 != NULL) && (strchr(argv0, '/') != NULL) )

return(NULL); /* higher level will parse out real path from argv0. */

/*

* Try to avoid using argv0 unless forced to. If there's a Linux-like

* /proc filesystem, you can get the full path to the current process from

* the /proc/self/exe symlink.

*/

retval = readSymLink("/proc/self/exe");

if (retval != NULL) /* chop off filename. */

{

char *ptr = strrchr(retval, '/');

if (ptr != NULL)

*ptr = '\0';

} /* if */

if ((retval == NULL) && (argv0 != NULL))

{

/* If there's no dirsep on argv0, then look through $PATH for it. */

envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");

BAIL_IF_MACRO(!envr, NULL, NULL);

retval = findBinaryInPath(argv0, envr);

allocator.Free(envr);

} /* if */

return(retval);

} /* __PHYSFS_platformCalcBaseDir */

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);

retval = (char *) allocator.Malloc(strlen(resolved_path) + 1);

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

strcpy(retval, resolved_path);

return(retval);

} /* __PHYSFS_platformRealPath */

char *__PHYSFS_platformCurrentDir(void)

{

/*

* This can't just do platformRealPath("."), since that would eventually

* just end up calling back into here.

*/

int allocSize = 0;

char *retval = NULL;

char *ptr;

do

{

allocSize += 100;

ptr = (char *) allocator.Realloc(retval, allocSize);

if (ptr == NULL)

{

if (retval != NULL)

allocator.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)

allocator.Free(retval);

BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);

} /* if */

return(retval);

} /* __PHYSFS_platformCurrentDir */

int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)

{

return(0); /* just use malloc() and friends. */

} /* __PHYSFS_platformSetDefaultAllocator */

#if (defined PHYSFS_NO_PTHREADS_SUPPORT)

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

typedef struct

{

pthread_mutex_t mutex;

pthread_t owner;

PHYSFS_uint32 count;

} PthreadMutex;

/* 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)

{

return(PHTREAD_TO_UI64(pthread_self()));

} /* __PHYSFS_platformGetThreadID */

void *__PHYSFS_platformCreateMutex(void)

{

int rc;

PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));

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

rc = pthread_mutex_init(&m->mutex, NULL);

if (rc != 0)

{

allocator.Free(m);

BAIL_MACRO(strerror(rc), 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;

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_NO_PTHREADS_SUPPORT */

#endif /* PHYSFS_PLATFORM_UNIX */

/* end of unix.c ... */