unix.c

嵌入式环境下的GUI

/*
 * 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>

#ifndef PHYSFS_DARWIN
#  if defined(__MACH__) && defined(__APPLE__)
#    define PHYSFS_DARWIN 1
#    include <CoreFoundation/CoreFoundation.h>
#    include <CoreServices/CoreServices.h>
#    include <IOKit/IOKitLib.h>
#    include <IOKit/storage/IOMedia.h>
#    include <IOKit/storage/IOCDMedia.h>
#    include <IOKit/storage/IODVDMedia.h>
#  endif
#endif

#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 */


#elif (defined PHYSFS_DARWIN)  /* "Big Nasty." */
/*
 * Code based on sample from Apple Developer Connection:
 *  http://developer.apple.com/samplecode/Sample_Code/Devices_and_Hardware/Disks/VolumeToBSDNode/VolumeToBSDNode.c.htm
 */

static int darwinIsWholeMedia(io_service_t service)
{
    int retval = 0;
    CFTypeRef wholeMedia;

    if (!IOObjectConformsTo(service, kIOMediaClass))
        return(0);
        
    wholeMedia = IORegistryEntryCreateCFProperty(service,
                                                 CFSTR(kIOMediaWholeKey),
                                                 kCFAllocatorDefault, 0);
    if (wholeMedia == NULL)
        return(0);

    retval = CFBooleanGetValue(wholeMedia);
    CFRelease(wholeMedia);

    return retval;
} /* darwinIsWholeMedia */


static int darwinIsMountedDisc(char *bsdName, mach_port_t masterPort)
{
    int retval = 0;
    CFMutableDictionaryRef matchingDict;
    kern_return_t rc;
    io_iterator_t iter;
    io_service_t service;

    if ((matchingDict = IOBSDNameMatching(masterPort, 0, bsdName)) == NULL)
        return(0);

    rc = IOServiceGetMatchingServices(masterPort, matchingDict, &iter);
    if ((rc != KERN_SUCCESS) || (!iter))
        return(0);

    service = IOIteratorNext(iter);
    IOObjectRelease(iter);
    if (!service)
        return(0);

    rc = IORegistryEntryCreateIterator(service, kIOServicePlane,
             kIORegistryIterateRecursively | kIORegistryIterateParents, &iter);
    
    if (!iter)
        return(0);

    if (rc != KERN_SUCCESS)
    {
        IOObjectRelease(iter);
        return(0);
    } /* if */

    IOObjectRetain(service);  /* add an extra object reference... */

    do
    {
        if (darwinIsWholeMedia(service))
        {
            if ( (IOObjectConformsTo(service, kIOCDMediaClass)) ||
                 (IOObjectConformsTo(service, kIODVDMediaClass)) )
            {
                retval = 1;
            } /* if */
        } /* if */
        IOObjectRelease(service);
    } while ((service = IOIteratorNext(iter)) && (!retval));
                
    IOObjectRelease(iter);
    IOObjectRelease(service);

    return(retval);
} /* darwinIsMountedDisc */


char **__PHYSFS_platformDetectAvailableCDs(void)
{
    const char *devPrefix = "/dev/";
    int prefixLen = strlen(devPrefix);
    mach_port_t masterPort = 0;
    char **retval = (char **) malloc(sizeof (char *));
    int cd_count = 1;  /* We count the NULL entry. */
    struct statfs *mntbufp;
    int i, mounts;

    retval[0] = NULL;

    if (IOMasterPort(MACH_PORT_NULL, &masterPort) != KERN_SUCCESS)
        return(retval);

    mounts = getmntinfo(&mntbufp, MNT_WAIT);  /* NOT THREAD SAFE! */
    for (i = 0; i < mounts; i++)
    {
        char *dev = mntbufp[i].f_mntfromname;
        char *mnt = mntbufp[i].f_mntonname;
        if (strncmp(dev, devPrefix, prefixLen) != 0)  /* a virtual device? */
            continue;

        dev += prefixLen;
        if (darwinIsMountedDisc(dev, masterPort))
        {
            char **tmp = realloc(retval, sizeof (char *) * (cd_count + 1));
            if (tmp)
            {
                retval = tmp;
                retval[cd_count - 1] = (char *) malloc(strlen(mnt) + 1);
                if (retval[cd_count - 1])
                {
                    strcpy(retval[cd_count - 1], mnt);
                    cd_count++;
                } /* if */
            } /* if */
        } /* if */
    } /* for */

    retval[cd_count - 1] = NULL;
    return(retval);
} /* __PHYSFS_platformDetectAvailableCDs */

#elif (defined 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 */

#elif (defined 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 */