/*

 * 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 ... */