/*

* Unix support routines for PhysicsFS.

*

*

* This file written by Ryan C. Gordon.

*/

#define __PHYSICSFS_INTERNAL__

#include "physfs_platforms.h"

#ifdef PHYSFS_PLATFORM_UNIX

#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>

#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

#ifdef PHYSFS_HAVE_MNTENT_H

#include <mntent.h>

#endif

#ifdef PHYSFS_HAVE_SYS_MNTTAB_H

#include <sys/mnttab.h>

#endif

#include "physfs_internal.h"

/* !!! FIXME: we should probably remove MAXPATHLEN entirely, if we can. */

#ifndef MAXPATHLEN

#define MAXPATHLEN 1024

#endif

int __PHYSFS_platformInit(void)

{

} /* __PHYSFS_platformInit */

int __PHYSFS_platformDeinit(void)

{

} /* __PHYSFS_platformDeinit */

#if (defined PHYSFS_NO_CDROM_SUPPORT)

/* no-op. */

struct statfs *mntbufp = NULL;

int mounts = getmntinfo(&mntbufp, MNT_WAIT);

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

{

int add_it = 0;

/* add other mount types here */

if (add_it)

FILE *mounts = NULL;

struct mntent *ent = NULL;

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

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

{

int add_it = 0;

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

add_it = 1;

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

add_it = 1;

/* !!! FIXME: these might pick up floppy drives, right? */

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

add_it = 1;

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

add_it = 1;

/* !!! FIXME: udf? automount? */

if (add_it)

} /* 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.

/* 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.

*

* 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)

if (x == NULL)

{

if (exe != NULL)

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. */

} while (ptr != NULL);

} /* 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) )

/*

* 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.

*/

if (retval == NULL)

{

/* older kernels don't have /proc/self ... try PID version... */

const unsigned long long pid = (unsigned long long) getpid();

char path[64];

const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);

if ( (rc > 0) && (rc < sizeof(path)) )

retval = readSymLink(path);

} /* if */

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

if (ptr != NULL)

*ptr = '\0';

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 */

if (retval != NULL)

{

/* try to shrink buffer... */

char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);

if (ptr != NULL)

retval = ptr; /* oh well if it failed. */

} /* if */

} /* __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);

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

strcpy(retval, resolved_path);

} /* __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 */

} /* __PHYSFS_platformCurrentDir */

int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)

{

} /* __PHYSFS_platformSetDefaultAllocator */

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

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

void __PHYSFS_platformReleaseMutex(void *mutex) {}

#else

typedef struct

{

pthread_mutex_t mutex;

pthread_t owner;

PHYSFS_uint32 count;

} PthreadMutex;

} /* __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)

{

BAIL_MACRO(strerror(rc), NULL);

} /* if */

m->count = 0;

m->owner = (pthread_t) 0xDEADBEEF;

} /* __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);

} /* __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)

m->owner = tid;

} /* if */

m->count++;

} /* __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 */