src/platform_unix.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 19 Aug 2014 10:55:56 -0400
changeset 1354 3e80839670da
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child 1373 527ef3c6a2d6
permissions -rw-r--r--
Make static analysis happy.
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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 <stdlib.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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#include <limits.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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17
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225
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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
225
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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);
225
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   164
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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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225
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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);
225
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            } /* if */
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   185
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            alloc_size = size;
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            exe = x;
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        } /* if */
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   189
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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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   195
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        if (access(exe, X_OK) == 0)  /* Exists as executable? We're done. */
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        {
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            exe[(size - binlen) - 1] = '\0'; /* chop off filename, leave '/' */
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            return exe;
225
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        } /* if */
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        start = ptr + 1;  /* start points to beginning of next element. */
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    } while (ptr != NULL);
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    if (exe != NULL)
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        allocator.Free(exe);
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    return NULL;  /* doesn't exist in path. */
225
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} /* findBinaryInPath */
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1001
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static char *readSymLink(const char *path)
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{
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    ssize_t len = 64;
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    ssize_t rc = -1;
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    char *retval = NULL;
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    while (1)
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    {
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         char *ptr = (char *) allocator.Realloc(retval, (size_t) len);
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         if (ptr == NULL)
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             break;   /* out of memory. */
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         retval = ptr;
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         rc = readlink(path, retval, len);
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         if (rc == -1)
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             break;  /* not a symlink, i/o error, etc. */
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         else if (rc < len)
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   230
         {
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             retval[rc] = '\0';  /* readlink doesn't null-terminate. */
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             return retval;  /* we're good to go. */
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         } /* else if */
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         len *= 2;  /* grow buffer, try again. */
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   236
    } /* while */
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    if (retval != NULL)
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   239
        allocator.Free(retval);
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    return NULL;
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   241
} /* readSymLink */
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23
bd6ba9c8717c Initial debugging: dropped PhysicsFS routines into the Build engine,
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char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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{
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    char *retval = NULL;
1266
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    const char *envr = NULL;
23
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   248
1337
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    /* Try to avoid using argv0 unless forced to. Try system-specific stuff. */
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   250
    
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    #if PHYSFS_PLATFORM_FREEBSD
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    {
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        char fullpath[PATH_MAX];
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        size_t buflen = sizeof (fullpath);
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        int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
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   256
        if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)
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   257
            retval = __PHYSFS_strdup(fullpath);
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   258
    }
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    #elif PHYSFS_PLATFORM_SOLARIS
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    {
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        const char *path = getexecname();
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        if ((path != NULL) && (path[0] == '/'))  /* must be absolute path... */
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            retval = __PHYSFS_strdup(path);
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    }
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    #endif
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    if (retval)
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        return retval;   /* already got it. */
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    /* If there's a Linux-like /proc filesystem, you can get the full path to
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     *  the current process from a symlink in there.
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     */
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    if (access("/proc", F_OK) == 0)
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    {
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        retval = readSymLink("/proc/self/exe");
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        if (!retval) retval = readSymLink("/proc/curproc/file");
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        if (!retval) retval = readSymLink("/proc/curproc/exe");
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        if (retval == NULL)
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        {
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            /* older kernels don't have /proc/self ... try PID version... */
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            const unsigned long long pid = (unsigned long long) getpid();
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            char path[64];
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            const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
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            if ( (rc > 0) && (rc < sizeof(path)) )
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                retval = readSymLink(path);
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        } /* if */
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    } /* if */
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    if (retval != NULL)  /* chop off filename. */
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    {
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        char *ptr = strrchr(retval, '/');
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        if (ptr != NULL)
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            *(ptr+1) = '\0';
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        else  /* shouldn't happen, but just in case... */
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        {
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            allocator.Free(retval);
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            retval = NULL;
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        } /* else */
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    } /* if */
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    /* No /proc/self/exe, etc, but we have an argv[0] we can parse? */
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    if ((retval == NULL) && (argv0 != NULL))
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    {
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        /* fast path: default behaviour can handle this. */
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        if (strchr(argv0, '/') != NULL)
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            return NULL;  /* higher level parses out real path from argv0. */
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        /* If there's no dirsep on argv0, then look through $PATH for it. */
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        envr = getenv("PATH");
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        if (envr != NULL)
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        {
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            char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1);
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            BAIL_IF_MACRO(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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            strcpy(path, envr);
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            retval = findBinaryInPath(argv0, path);
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            __PHYSFS_smallFree(path);
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        } /* if */
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    } /* if */
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1002
001380a457a0 Try to shrink returned buffer's allocation.
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    if (retval != NULL)
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    {
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        /* try to shrink buffer... */
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        char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
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        if (ptr != NULL)
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            retval = ptr;  /* oh well if it failed. */
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    } /* if */
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    return retval;
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} /* __PHYSFS_platformCalcBaseDir */
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char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
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{
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    /*
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   336
     * We use XDG's base directory spec, even if you're not on Linux.
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   337
     *  This isn't strictly correct, but the results are relatively sane
1e6db80d2393 Added PHYSFS_getPrefDir().
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   338
     *  in any case.
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   339
     *
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     * http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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   341
     */
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   342
    const char *envr = getenv("XDG_DATA_HOME");
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   343
    const char *append = "/";
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   344
    char *retval = NULL;
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   345
    size_t len = 0;
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   346
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   347
    if (!envr)
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   348
    {
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   349
        /* You end up with "$HOME/.local/share/Game Name 2" */
1e6db80d2393 Added PHYSFS_getPrefDir().
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   350
        envr = __PHYSFS_getUserDir();
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   351
        BAIL_IF_MACRO(!envr, ERRPASS, NULL);  /* oh well. */
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   352
        append = ".local/share/";
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   353
    } /* if */
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   354
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4fa9fe3e0b52 Make sure the prefdir has a final dirsep on it.
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    len = strlen(envr) + strlen(append) + strlen(app) + 2;
1242
1e6db80d2393 Added PHYSFS_getPrefDir().
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   356
    retval = (char *) allocator.Malloc(len);
1e6db80d2393 Added PHYSFS_getPrefDir().
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   357
    BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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   358
    snprintf(retval, len, "%s%s%s/", envr, append, app);
1242
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   359
    return retval;
1e6db80d2393 Added PHYSFS_getPrefDir().
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   360
} /* __PHYSFS_platformCalcPrefDir */
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   361
1e6db80d2393 Added PHYSFS_getPrefDir().
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   362
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3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   363
int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   364
{
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   365
    return 0;  /* just use malloc() and friends. */
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3f150ffcf50c Since all the platform layers were using the same cut-and-paste of the
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   366
} /* __PHYSFS_platformSetDefaultAllocator */
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   367
818
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   368
#endif /* PHYSFS_PLATFORM_UNIX */
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1b74a7df1ca6 Split some of the unix.c code out to posix.c for BeOS to use.
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   369
17
7337737f5120 Moved from root source dir.
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/* end of unix.c ... */
7337737f5120 Moved from root source dir.
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   371