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physfs/platform/unix.c

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/*
* 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 <sys/param.h>
#include <dirent.h>
#include <time.h>
#include <errno.h>
#include <sys/mount.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>
#endif
#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
#ifdef PHYSFS_HAVE_SYS_UCRED_H
char **__PHYSFS_platformDetectAvailableCDs(void)
{
char **retval = (char **) malloc(sizeof (char *));
int cd_count = 1; /* We count the NULL entry. */
struct statfs *mntbufp = NULL;
int mounts;
int i;
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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)
{
char **tmp = realloc(retval, sizeof (char *) * (cd_count + 1));
if (tmp)
{
retval = tmp;
retval[cd_count - 1] = (char *)
malloc(strlen(mntbufp[i].f_mntonname) + 1);
if (retval[cd_count - 1])
{
strcpy(retval[cd_count - 1], mntbufp[i].f_mntonname);
cd_count++;
} /* if */
} /* if */
} /* if */
} /* for */
retval[cd_count - 1] = NULL;
return(retval);
} /* __PHYSFS_platformDetectAvailableCDs */
#endif
#ifdef PHYSFS_HAVE_MNTENT_H
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)
{
char **tmp = realloc(retval, sizeof (char *) * (cd_count + 1));
if (tmp)
{
retval = tmp;
retval[cd_count-1] = (char *) malloc(strlen(ent->mnt_dir) + 1);
if (retval[cd_count - 1])
{
strcpy(retval[cd_count - 1], ent->mnt_dir);
cd_count++;
} /* if */
} /* if */
} /* if */
} /* while */
endmntent(mounts);
retval[cd_count - 1] = NULL;
return(retval);
} /* __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;
} /* 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)
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);
envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");
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)
{
usleep( 10 * 1000 ); /* don't care if it fails. */
} /* __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);
retval = (char *) malloc(strlen(resolved_path) + 1);
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 */
#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
/* 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;
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 */
#endif /* !defined __BEOS__ && !defined WIN32 */
/* end of unix.c ... */
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