/*

* 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 <ctype.h>

#include <unistd.h>

#include <stdlib.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>

#include <limits.h>

#if PHYSFS_NO_CDROM_SUPPORT

#elif PHYSFS_PLATFORM_LINUX

# define PHYSFS_HAVE_MNTENT_H 1

#elif defined __CYGWIN__

# define PHYSFS_HAVE_MNTENT_H 1

#elif PHYSFS_PLATFORM_SOLARIS

# define PHYSFS_HAVE_SYS_MNTTAB_H 1

#elif PHYSFS_PLATFORM_BSD

# define PHYSFS_HAVE_SYS_UCRED_H 1

#else

# warning No CD-ROM support included. Either define your platform here,

# warning or define PHYSFS_NO_CDROM_SUPPORT=1 to confirm this is intentional.

#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

#if PHYSFS_PLATFORM_FREEBSD

#include <sys/sysctl.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(mounts == NULL, PHYSFS_ERR_IO, /*return void*/);

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? */

/* 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(mounts == NULL, PHYSFS_ERR_IO, /*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);

#endif

} /* __PHYSFS_platformDetectAvailableCDs */

/*

* 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;

assert(bin != NULL);

assert(envr != NULL);

do

{

size_t size;

size_t binlen;

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

if (ptr)

*ptr = '\0';

binlen = strlen(bin);

size = strlen(start) + binlen + 2;

if (size >= alloc_size)

{

char *x = (char *) allocator.Realloc(exe, size);

if (!x)

{

if (exe != NULL)

allocator.Free(exe);

BAIL(PHYSFS_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. */

{

exe[(size - binlen) - 1] = '\0'; /* chop off filename, leave '/' */

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;

const char *envr = NULL;

/* Try to avoid using argv0 unless forced to. Try system-specific stuff. */

#if PHYSFS_PLATFORM_FREEBSD

{

char fullpath[PATH_MAX];

size_t buflen = sizeof (fullpath);

int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };

if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)

retval = __PHYSFS_strdup(fullpath);

}

#elif PHYSFS_PLATFORM_SOLARIS

{

const char *path = getexecname();

if ((path != NULL) && (path[0] == '/')) /* must be absolute path... */

retval = __PHYSFS_strdup(path);

}

#endif

/* If there's a Linux-like /proc filesystem, you can get the full path to

* the current process from a symlink in there.

*/

if (!retval && (access("/proc", F_OK) == 0))

{

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

if (!retval) retval = readSymLink("/proc/curproc/file");

if (!retval) retval = readSymLink("/proc/curproc/exe");

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 */

} /* if */

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

{

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

if (ptr != NULL)

*(ptr+1) = '\0';

else /* shouldn't happen, but just in case... */

{

allocator.Free(retval);

retval = NULL;

} /* else */

} /* if */

/* No /proc/self/exe, etc, but we have an argv[0] we can parse? */

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

{

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

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

return NULL; /* higher level parses out real path from argv0. */

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

envr = getenv("PATH");

if (envr != NULL)

{

char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1);

BAIL_IF(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

strcpy(path, envr);

retval = findBinaryInPath(argv0, path);

__PHYSFS_smallFree(path);

} /* if */

} /* 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 */

return retval;

} /* __PHYSFS_platformCalcBaseDir */

char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)

{

/*

* We use XDG's base directory spec, even if you're not on Linux.

* This isn't strictly correct, but the results are relatively sane

* in any case.

*

* https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

*/

const char *envr = getenv("XDG_DATA_HOME");

const char *append = "/";

char *retval = NULL;

size_t len = 0;

if (!envr)

{

/* You end up with "$HOME/.local/share/Game Name 2" */

envr = __PHYSFS_getUserDir();

BAIL_IF_ERRPASS(!envr, NULL); /* oh well. */

append = ".local/share/";

} /* if */

len = strlen(envr) + strlen(append) + strlen(app) + 2;

retval = (char *) allocator.Malloc(len);

BAIL_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

snprintf(retval, len, "%s%s%s/", envr, append, app);

return retval;

} /* __PHYSFS_platformCalcPrefDir */

#endif /* PHYSFS_PLATFORM_UNIX */

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