misc/libphysfs/platform_unix.c
author unc0rr
Wed, 25 Dec 2013 00:55:26 +0400
branch0.9.20
changeset 9843 7918943c0ff1
parent 8524 a65e9bcf0a03
child 9799 a3fe81c3bc02
permissions -rw-r--r--
Bump up protocol number
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/*
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 * Unix support routines for PhysicsFS.
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_platforms.h"
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#ifdef PHYSFS_PLATFORM_UNIX
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <dirent.h>
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#include <time.h>
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#include <errno.h>
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#if PHYSFS_PLATFORM_LINUX && !defined(PHYSFS_HAVE_MNTENT_H)
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#define PHYSFS_HAVE_MNTENT_H 1
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#elif PHYSFS_PLATFORM_SOLARIS && !defined(PHYSFS_HAVE_SYS_MNTTAB_H)
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#define PHYSFS_HAVE_SYS_MNTTAB_H 1
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#elif PHYSFS_PLATFORM_BSD && !defined(PHYSFS_HAVE_SYS_UCRED_H)
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#define PHYSFS_HAVE_SYS_UCRED_H 1
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#endif
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#ifdef PHYSFS_HAVE_SYS_UCRED_H
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#  ifdef PHYSFS_HAVE_MNTENT_H
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#    undef PHYSFS_HAVE_MNTENT_H /* don't do both... */
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#  endif
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#  include <sys/mount.h>
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#  include <sys/ucred.h>
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#endif
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#ifdef PHYSFS_HAVE_MNTENT_H
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#include <mntent.h>
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#endif
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#ifdef PHYSFS_HAVE_SYS_MNTTAB_H
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#include <sys/mnttab.h>
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#endif
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#include "physfs_internal.h"
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int __PHYSFS_platformInit(void)
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{
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    return 1;  /* always succeed. */
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} /* __PHYSFS_platformInit */
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int __PHYSFS_platformDeinit(void)
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{
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    return 1;  /* always succeed. */
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} /* __PHYSFS_platformDeinit */
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/* Stub version for platforms without CD-ROM support. */
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void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
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{
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#if (defined PHYSFS_NO_CDROM_SUPPORT)
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    /* no-op. */
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#elif (defined PHYSFS_HAVE_SYS_UCRED_H)
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    int i;
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    struct statfs *mntbufp = NULL;
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    int mounts = getmntinfo(&mntbufp, MNT_WAIT);
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    for (i = 0; i < mounts; i++)
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    {
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        int add_it = 0;
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        if (strcmp(mntbufp[i].f_fstypename, "iso9660") == 0)
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            add_it = 1;
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        else if (strcmp( mntbufp[i].f_fstypename, "cd9660") == 0)
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            add_it = 1;
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        /* add other mount types here */
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        if (add_it)
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            cb(data, mntbufp[i].f_mntonname);
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    } /* for */
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#elif (defined PHYSFS_HAVE_MNTENT_H)
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    FILE *mounts = NULL;
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    struct mntent *ent = NULL;
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    mounts = setmntent("/etc/mtab", "r");
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    BAIL_IF_MACRO(mounts == NULL, PHYSFS_ERR_IO, /*return void*/);
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    while ( (ent = getmntent(mounts)) != NULL )
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    {
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        int add_it = 0;
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        if (strcmp(ent->mnt_type, "iso9660") == 0)
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            add_it = 1;
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        else if (strcmp(ent->mnt_type, "udf") == 0)
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            add_it = 1;
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        /* !!! FIXME: these might pick up floppy drives, right? */
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        else if (strcmp(ent->mnt_type, "auto") == 0)
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            add_it = 1;
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        else if (strcmp(ent->mnt_type, "supermount") == 0)
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            add_it = 1;
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        /* !!! FIXME: udf? automount? */
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        /* add other mount types here */
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        if (add_it)
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            cb(data, ent->mnt_dir);
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    } /* while */
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    endmntent(mounts);
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#elif (defined PHYSFS_HAVE_SYS_MNTTAB_H)
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    FILE *mounts = fopen(MNTTAB, "r");
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    struct mnttab ent;
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    BAIL_IF_MACRO(mounts == NULL, PHYSFS_ERR_IO, /*return void*/);
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    while (getmntent(mounts, &ent) == 0)
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    {
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        int add_it = 0;
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        if (strcmp(ent.mnt_fstype, "hsfs") == 0)
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            add_it = 1;
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        /* add other mount types here */
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        if (add_it)
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            cb(data, ent.mnt_mountp);
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    } /* while */
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    fclose(mounts);
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#else
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#error Unknown platform. Should have defined PHYSFS_NO_CDROM_SUPPORT, perhaps.
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#endif
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} /* __PHYSFS_platformDetectAvailableCDs */
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/*
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 * See where program (bin) resides in the $PATH specified by (envr).
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 *  returns a copy of the first element in envr that contains it, or NULL
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 *  if it doesn't exist or there were other problems. PHYSFS_SetError() is
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 *  called if we have a problem.
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 *
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 * (envr) will be scribbled over, and you are expected to allocator.Free() the
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 *  return value when you're done with it.
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 */
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static char *findBinaryInPath(const char *bin, char *envr)
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{
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    size_t alloc_size = 0;
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    char *exe = NULL;
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    char *start = envr;
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    char *ptr;
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    assert(bin != NULL);
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    assert(envr != NULL);
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    do
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    {
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        size_t size;
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        size_t binlen;
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        ptr = strchr(start, ':');  /* find next $PATH separator. */
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        if (ptr)
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            *ptr = '\0';
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        binlen = strlen(bin);
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        size = strlen(start) + binlen + 2;
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        if (size > alloc_size)
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        {
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            char *x = (char *) allocator.Realloc(exe, size);
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            if (!x)
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            {
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                if (exe != NULL)
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                    allocator.Free(exe);
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                BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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            } /* if */
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            alloc_size = size;
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            exe = x;
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        } /* if */
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        /* build full binary path... */
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        strcpy(exe, start);
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        if ((exe[0] == '\0') || (exe[strlen(exe) - 1] != '/'))
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            strcat(exe, "/");
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        strcat(exe, bin);
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   194
        if (access(exe, X_OK) == 0)  /* Exists as executable? We're done. */
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   195
        {
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   196
            exe[size - binlen] = '\0'; /* chop off filename, leave '/' */
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   197
            return exe;
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   198
        } /* if */
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   199
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        start = ptr + 1;  /* start points to beginning of next element. */
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   201
    } while (ptr != NULL);
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   202
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   203
    if (exe != NULL)
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   204
        allocator.Free(exe);
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   205
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   206
    return NULL;  /* doesn't exist in path. */
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} /* findBinaryInPath */
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   208
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   209
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static char *readSymLink(const char *path)
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   211
{
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   212
    ssize_t len = 64;
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   213
    ssize_t rc = -1;
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   214
    char *retval = NULL;
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   215
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   216
    while (1)
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   217
    {
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   218
         char *ptr = (char *) allocator.Realloc(retval, (size_t) len);
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   219
         if (ptr == NULL)
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   220
             break;   /* out of memory. */
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   221
         retval = ptr;
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   222
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   223
         rc = readlink(path, retval, len);
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   224
         if (rc == -1)
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   225
             break;  /* not a symlink, i/o error, etc. */
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   226
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   227
         else if (rc < len)
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   228
         {
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   229
             retval[rc] = '\0';  /* readlink doesn't null-terminate. */
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   230
             return retval;  /* we're good to go. */
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   231
         } /* else if */
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   232
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   233
         len *= 2;  /* grow buffer, try again. */
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   234
    } /* while */
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   235
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   236
    if (retval != NULL)
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   237
        allocator.Free(retval);
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   238
    return NULL;
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   239
} /* readSymLink */
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   240
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   241
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   242
char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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   243
{
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   244
    char *retval = NULL;
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   245
    const char *envr = NULL;
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diff changeset
   246
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   247
    /*
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   248
     * Try to avoid using argv0 unless forced to. If there's a Linux-like
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   249
     *  /proc filesystem, you can get the full path to the current process from
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   250
     *  the /proc/self/exe symlink.
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   251
     */
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   252
    retval = readSymLink("/proc/self/exe");
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   253
    if (retval == NULL)
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   254
    {
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   255
        /* older kernels don't have /proc/self ... try PID version... */
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   256
        const unsigned long long pid = (unsigned long long) getpid();
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   257
        char path[64];
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   258
        const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
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   259
        if ( (rc > 0) && (rc < sizeof(path)) )
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   260
            retval = readSymLink(path);
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parents:
diff changeset
   261
    } /* if */
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diff changeset
   262
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diff changeset
   263
    if (retval != NULL)  /* chop off filename. */
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diff changeset
   264
    {
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   265
        char *ptr = strrchr(retval, '/');
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parents:
diff changeset
   266
        if (ptr != NULL)
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diff changeset
   267
            *(ptr+1) = '\0';
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parents:
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   268
        else  /* shouldn't happen, but just in case... */
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parents:
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   269
        {
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   270
            allocator.Free(retval);
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   271
            retval = NULL;
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diff changeset
   272
        } /* else */
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parents:
diff changeset
   273
    } /* if */
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diff changeset
   274
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   275
    /* No /proc/self/exe, but we have an argv[0] we can parse? */
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diff changeset
   276
    if ((retval == NULL) && (argv0 != NULL))
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   277
    {
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parents:
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   278
        /* fast path: default behaviour can handle this. */
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diff changeset
   279
        if (strchr(argv0, '/') != NULL)
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   280
            return NULL;  /* higher level parses out real path from argv0. */
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   281
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   282
        /* If there's no dirsep on argv0, then look through $PATH for it. */
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   283
        envr = getenv("PATH");
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parents:
diff changeset
   284
        if (envr != NULL)
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parents:
diff changeset
   285
        {
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   286
            char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1);
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   287
            BAIL_IF_MACRO(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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   288
            strcpy(path, envr);
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diff changeset
   289
            retval = findBinaryInPath(argv0, path);
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parents:
diff changeset
   290
            __PHYSFS_smallFree(path);
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parents:
diff changeset
   291
        } /* if */
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parents:
diff changeset
   292
    } /* if */
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parents:
diff changeset
   293
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parents:
diff changeset
   294
    if (retval != NULL)
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parents:
diff changeset
   295
    {
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parents:
diff changeset
   296
        /* try to shrink buffer... */
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parents:
diff changeset
   297
        char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
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parents:
diff changeset
   298
        if (ptr != NULL)
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   299
            retval = ptr;  /* oh well if it failed. */
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parents:
diff changeset
   300
    } /* if */
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parents:
diff changeset
   301
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   302
    return retval;
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parents:
diff changeset
   303
} /* __PHYSFS_platformCalcBaseDir */
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parents:
diff changeset
   304
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parents:
diff changeset
   305
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parents:
diff changeset
   306
char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   307
{
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parents:
diff changeset
   308
    /*
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parents:
diff changeset
   309
     * We use XDG's base directory spec, even if you're not on Linux.
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parents:
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   310
     *  This isn't strictly correct, but the results are relatively sane
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   311
     *  in any case.
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   312
     *
13e2037ebc79 Try using PhysicsFS.
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parents:
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   313
     * http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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parents:
diff changeset
   314
     */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   315
    const char *envr = getenv("XDG_DATA_HOME");
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   316
    const char *append = "/";
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parents:
diff changeset
   317
    char *retval = NULL;
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parents:
diff changeset
   318
    size_t len = 0;
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parents:
diff changeset
   319
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   320
    if (!envr)
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   321
    {
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parents:
diff changeset
   322
        /* You end up with "$HOME/.local/share/Game Name 2" */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   323
        envr = __PHYSFS_getUserDir();
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   324
        BAIL_IF_MACRO(!envr, ERRPASS, NULL);  /* oh well. */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   325
        append = ".local/share/";
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   326
    } /* if */
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parents:
diff changeset
   327
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   328
    len = strlen(envr) + strlen(append) + strlen(app) + 2;
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   329
    retval = (char *) allocator.Malloc(len);
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   330
    BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   331
    snprintf(retval, len, "%s%s%s/", envr, append, app);
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   332
    return retval;
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   333
} /* __PHYSFS_platformCalcPrefDir */
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   334
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   335
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   336
int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   337
{
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unc0rr
parents:
diff changeset
   338
    return 0;  /* just use malloc() and friends. */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   339
} /* __PHYSFS_platformSetDefaultAllocator */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   340
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parents:
diff changeset
   341
#endif /* PHYSFS_PLATFORM_UNIX */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   342
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unc0rr
parents:
diff changeset
   343
/* end of unix.c ... */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   344