src/platform_unix.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 11 Mar 2012 03:39:57 -0400
changeset 1210 cf758fec0273
parent 1173 77b2df665bd1
child 1211 09280603503b
permissions -rw-r--r--
Change how Unix version of __PHYSFS_platformCurrentDir() allocates memory.
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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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#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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/* !!! FIXME: we should probably remove MAXPATHLEN entirely, if we can. */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024
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#endif
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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, ERR_IO_ERROR, /*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, ERR_IO_ERROR, /*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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/* this is in posix.c ... */
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extern char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname);
20
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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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    BAIL_IF_MACRO(bin == NULL, ERR_INVALID_ARGUMENT, NULL);
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    BAIL_IF_MACRO(envr == NULL, ERR_INVALID_ARGUMENT, NULL);
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    do
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    {
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        size_t size;
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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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        size = strlen(start) + strlen(bin) + 2;
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        if (size > alloc_size)
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        {
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            char *x = (char *) allocator.Realloc(exe, size);
225
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            if (x == NULL)
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            {
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                if (exe != NULL)
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                    allocator.Free(exe);
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                BAIL_MACRO(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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        if (access(exe, X_OK) == 0)  /* Exists as executable? We're done. */
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        {
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            strcpy(exe, start);  /* i'm lazy. piss off. */
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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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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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         {
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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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    } /* while */
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    if (retval != NULL)
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        allocator.Free(retval);
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    return NULL;
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} /* readSymLink */
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char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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{
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    char *retval = NULL;
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    char *envr = NULL;
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    /* fast path: default behaviour can handle this. */
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    if ( (argv0 != NULL) && (strchr(argv0, '/') != NULL) )
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        return NULL;  /* higher level will parse out real path from argv0. */
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    /*
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     * Try to avoid using argv0 unless forced to. If there's a Linux-like
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     *  /proc filesystem, you can get the full path to the current process from
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     *  the /proc/self/exe symlink.
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     */
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    retval = readSymLink("/proc/self/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 (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 = '\0';
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    } /* if */
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    if ((retval == NULL) && (argv0 != NULL))
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    {
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        /* If there's no dirsep on argv0, then look through $PATH for it. */
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        envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");
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        BAIL_IF_MACRO(!envr, NULL, NULL);
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        retval = findBinaryInPath(argv0, envr);
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        allocator.Free(envr);
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    } /* if */
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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_platformRealPath(const char *path)
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{
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    char resolved_path[MAXPATHLEN];
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    char *retval = NULL;
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    errno = 0;
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    BAIL_IF_MACRO(!realpath(path, resolved_path), strerror(errno), NULL);
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    retval = (char *) allocator.Malloc(strlen(resolved_path) + 1);
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    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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    strcpy(retval, resolved_path);
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    return retval;
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} /* __PHYSFS_platformRealPath */
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char *__PHYSFS_platformCurrentDir(void)
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{
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    int allocSize = 64;
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    char *retval = NULL;
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    char *ptr;
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    do
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    {
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        allocSize *= 2;
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        ptr = (char *) allocator.Realloc(retval, allocSize);
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        if (ptr == NULL)
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        {
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            if (retval != NULL)
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                allocator.Free(retval);
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            BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
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        } /* if */
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        retval = ptr;
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        ptr = getcwd(retval, allocSize);
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    } while (ptr == NULL && errno == ERANGE);
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    if (ptr == NULL && errno)
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    {
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        /* getcwd() failed , for example current directory not existing... */
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        if (retval != NULL)
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            allocator.Free(retval);
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        BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
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    } /* if */
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    /* try to shrink buffer... */
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    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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    return retval;
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} /* __PHYSFS_platformCurrentDir */
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int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
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{
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    return 0;  /* just use malloc() and friends. */
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} /* __PHYSFS_platformSetDefaultAllocator */
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#endif /* PHYSFS_PLATFORM_UNIX */
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/* end of unix.c ... */
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