misc/libphysfs/platform_posix.c
author Wuzzy <almikes@aol.com>
Sat, 30 Sep 2017 02:09:43 +0200
changeset 12606 f1e0fa009eb7
parent 12213 bb5522e88ab2
permissions -rw-r--r--
ACF1: Change rope challenge confirm key to [Attack]
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/*
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 * Posix-esque 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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/* !!! FIXME: check for EINTR? */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_platforms.h"
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#ifdef PHYSFS_PLATFORM_POSIX
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#if ((!defined PHYSFS_NO_THREAD_SUPPORT) && (!defined PHYSFS_PLATFORM_BEOS))
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#include <pthread.h>
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#endif
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#include "physfs_internal.h"
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static PHYSFS_ErrorCode errcodeFromErrnoError(const int err)
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{
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    switch (err)
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    {
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        case 0: return PHYSFS_ERR_OK;
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        case EACCES: return PHYSFS_ERR_PERMISSION;
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        case EPERM: return PHYSFS_ERR_PERMISSION;
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        case EDQUOT: return PHYSFS_ERR_NO_SPACE;
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        case EIO: return PHYSFS_ERR_IO;
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        case ELOOP: return PHYSFS_ERR_SYMLINK_LOOP;
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        case EMLINK: return PHYSFS_ERR_NO_SPACE;
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        case ENAMETOOLONG: return PHYSFS_ERR_BAD_FILENAME;
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bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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        case ENOENT: return PHYSFS_ERR_NOT_FOUND;
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        case ENOSPC: return PHYSFS_ERR_NO_SPACE;
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        case ENOTDIR: return PHYSFS_ERR_NOT_FOUND;
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        case EISDIR: return PHYSFS_ERR_NOT_A_FILE;
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        case EROFS: return PHYSFS_ERR_READ_ONLY;
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        case ETXTBSY: return PHYSFS_ERR_BUSY;
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        case EBUSY: return PHYSFS_ERR_BUSY;
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        case ENOMEM: return PHYSFS_ERR_OUT_OF_MEMORY;
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        case ENOTEMPTY: return PHYSFS_ERR_DIR_NOT_EMPTY;
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        default: return PHYSFS_ERR_OS_ERROR;
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    } /* switch */
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} /* errcodeFromErrnoError */
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static inline PHYSFS_ErrorCode errcodeFromErrno(void)
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{
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    return errcodeFromErrnoError(errno);
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} /* errcodeFromErrno */
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static char *getUserDirByUID(void)
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{
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    uid_t uid = getuid();
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    struct passwd *pw;
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    char *retval = NULL;
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    pw = getpwuid(uid);
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    if ((pw != NULL) && (pw->pw_dir != NULL) && (*pw->pw_dir != '\0'))
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    {
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        const size_t dlen = strlen(pw->pw_dir);
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        const size_t add_dirsep = (pw->pw_dir[dlen-1] != '/') ? 1 : 0;
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        retval = (char *) allocator.Malloc(dlen + 1 + add_dirsep);
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        if (retval != NULL)
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        {
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            strcpy(retval, pw->pw_dir);
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            if (add_dirsep)
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            {
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                retval[dlen] = '/';
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                retval[dlen+1] = '\0';
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            } /* if */
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        } /* if */
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    } /* if */
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    return retval;
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} /* getUserDirByUID */
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char *__PHYSFS_platformCalcUserDir(void)
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{
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    char *retval = NULL;
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    char *envr = getenv("HOME");
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    /* if the environment variable was set, make sure it's really a dir. */
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    if (envr != NULL)
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    {
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        struct stat statbuf;
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        if ((stat(envr, &statbuf) != -1) && (S_ISDIR(statbuf.st_mode)))
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        {
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            const size_t envrlen = strlen(envr);
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            const size_t add_dirsep = (envr[envrlen-1] != '/') ? 1 : 0;
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            retval = allocator.Malloc(envrlen + 1 + add_dirsep);
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            if (retval)
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            {
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                strcpy(retval, envr);
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                if (add_dirsep)
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                {
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                    retval[envrlen] = '/';
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                    retval[envrlen+1] = '\0';
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                } /* if */
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            } /* if */
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        } /* if */
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    } /* if */
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    if (retval == NULL)
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        retval = getUserDirByUID();
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    return retval;
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} /* __PHYSFS_platformCalcUserDir */
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void __PHYSFS_platformEnumerateFiles(const char *dirname,
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                                     PHYSFS_EnumFilesCallback callback,
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                                     const char *origdir,
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                                     void *callbackdata)
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{
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    DIR *dir;
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    struct dirent *ent;
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    char *buf = NULL;
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    errno = 0;
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    dir = opendir(dirname);
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    if (dir == NULL)
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    {
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        allocator.Free(buf);
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        return;
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    } /* if */
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    while ((ent = readdir(dir)) != NULL)
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    {
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        if (strcmp(ent->d_name, ".") == 0)
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            continue;
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bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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        else if (strcmp(ent->d_name, "..") == 0)
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            continue;
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        callback(callbackdata, origdir, ent->d_name);
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    } /* while */
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    allocator.Free(buf);
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    closedir(dir);
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} /* __PHYSFS_platformEnumerateFiles */
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int __PHYSFS_platformMkDir(const char *path)
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{
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    const int rc = mkdir(path, S_IRWXU);
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    BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), 0);
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    return 1;
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} /* __PHYSFS_platformMkDir */
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static void *doOpen(const char *filename, int mode)
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{
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    const int appending = (mode & O_APPEND);
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    int fd;
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    int *retval;
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    errno = 0;
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    /* O_APPEND doesn't actually behave as we'd like. */
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    mode &= ~O_APPEND;
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    fd = open(filename, mode, S_IRUSR | S_IWUSR);
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    BAIL_IF_MACRO(fd < 0, errcodeFromErrno(), NULL);
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    if (appending)
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    {
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        if (lseek(fd, 0, SEEK_END) < 0)
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        {
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            const int err = errno;
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            close(fd);
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            BAIL_MACRO(errcodeFromErrnoError(err), NULL);
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        } /* if */
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    } /* if */
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    retval = (int *) allocator.Malloc(sizeof (int));
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    if (!retval)
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    {
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        close(fd);
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        BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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   192
    } /* if */
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   193
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    *retval = fd;
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   195
    return ((void *) retval);
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} /* doOpen */
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   197
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void *__PHYSFS_platformOpenRead(const char *filename)
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{
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    return doOpen(filename, O_RDONLY);
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   202
} /* __PHYSFS_platformOpenRead */
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void *__PHYSFS_platformOpenWrite(const char *filename)
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{
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   207
    return doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC);
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} /* __PHYSFS_platformOpenWrite */
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void *__PHYSFS_platformOpenAppend(const char *filename)
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{
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   213
    return doOpen(filename, O_WRONLY | O_CREAT | O_APPEND);
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} /* __PHYSFS_platformOpenAppend */
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PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
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   218
                                    PHYSFS_uint64 len)
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{
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    const int fd = *((int *) opaque);
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    ssize_t rc = 0;
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   222
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   223
    if (!__PHYSFS_ui64FitsAddressSpace(len))
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        BAIL_MACRO(PHYSFS_ERR_INVALID_ARGUMENT, -1);
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   225
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    rc = read(fd, buffer, (size_t) len);
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   227
    BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), -1);
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   228
    assert(rc >= 0);
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   229
    assert(rc <= len);
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   230
    return (PHYSFS_sint64) rc;
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   231
} /* __PHYSFS_platformRead */
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   232
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   234
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
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   235
                                     PHYSFS_uint64 len)
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{
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    const int fd = *((int *) opaque);
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   238
    ssize_t rc = 0;
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   239
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   240
    if (!__PHYSFS_ui64FitsAddressSpace(len))
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   241
        BAIL_MACRO(PHYSFS_ERR_INVALID_ARGUMENT, -1);
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   242
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   243
    rc = write(fd, (void *) buffer, (size_t) len);
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   244
    BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), rc);
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   245
    assert(rc >= 0);
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   246
    assert(rc <= len);
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   247
    return (PHYSFS_sint64) rc;
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   248
} /* __PHYSFS_platformWrite */
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   249
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   250
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   251
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
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   252
{
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   253
    const int fd = *((int *) opaque);
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   254
    const int rc = lseek(fd, (off_t) pos, SEEK_SET);
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   255
    BAIL_IF_MACRO(rc == -1, errcodeFromErrno(), 0);
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   256
    return 1;
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   257
} /* __PHYSFS_platformSeek */
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   258
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   259
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   260
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
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   261
{
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   262
    const int fd = *((int *) opaque);
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   263
    PHYSFS_sint64 retval;
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   264
    retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
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   265
    BAIL_IF_MACRO(retval == -1, errcodeFromErrno(), -1);
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   266
    return retval;
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   267
} /* __PHYSFS_platformTell */
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   268
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   269
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   270
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
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   271
{
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   272
    const int fd = *((int *) opaque);
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   273
    struct stat statbuf;
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   274
    BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, errcodeFromErrno(), -1);
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   275
    return ((PHYSFS_sint64) statbuf.st_size);
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   276
} /* __PHYSFS_platformFileLength */
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   277
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   278
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   279
int __PHYSFS_platformFlush(void *opaque)
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   280
{
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   281
    const int fd = *((int *) opaque);
12213
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    if ((fcntl(fd, F_GETFL) & O_ACCMODE) != O_RDONLY)
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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   283
        BAIL_IF_MACRO(fsync(fd) == -1, errcodeFromErrno(), 0);
7768
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   284
    return 1;
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   285
} /* __PHYSFS_platformFlush */
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   286
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   287
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   288
void __PHYSFS_platformClose(void *opaque)
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   289
{
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   290
    const int fd = *((int *) opaque);
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   291
    (void) close(fd);  /* we don't check this. You should have used flush! */
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   292
    allocator.Free(opaque);
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   293
} /* __PHYSFS_platformClose */
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   294
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   295
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   296
int __PHYSFS_platformDelete(const char *path)
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parents:
diff changeset
   297
{
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   298
    BAIL_IF_MACRO(remove(path) == -1, errcodeFromErrno(), 0);
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parents:
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   299
    return 1;
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   300
} /* __PHYSFS_platformDelete */
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   301
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   302
12213
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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   303
int __PHYSFS_platformStat(const char *filename, PHYSFS_Stat *st)
7768
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   304
{
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   305
    struct stat statbuf;
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   306
12213
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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   307
    BAIL_IF_MACRO(lstat(filename, &statbuf) == -1, errcodeFromErrno(), 0);
7768
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   308
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diff changeset
   309
    if (S_ISREG(statbuf.st_mode))
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   310
    {
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   311
        st->filetype = PHYSFS_FILETYPE_REGULAR;
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   312
        st->filesize = statbuf.st_size;
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diff changeset
   313
    } /* if */
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diff changeset
   314
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diff changeset
   315
    else if(S_ISDIR(statbuf.st_mode))
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parents:
diff changeset
   316
    {
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   317
        st->filetype = PHYSFS_FILETYPE_DIRECTORY;
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parents:
diff changeset
   318
        st->filesize = 0;
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parents:
diff changeset
   319
    } /* else if */
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diff changeset
   320
12213
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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diff changeset
   321
    else if(S_ISLNK(statbuf.st_mode))
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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diff changeset
   322
    {
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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diff changeset
   323
        st->filetype = PHYSFS_FILETYPE_SYMLINK;
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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diff changeset
   324
        st->filesize = 0;
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents: 10017
diff changeset
   325
    } /* else if */
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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diff changeset
   326
7768
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diff changeset
   327
    else
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diff changeset
   328
    {
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parents:
diff changeset
   329
        st->filetype = PHYSFS_FILETYPE_OTHER;
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parents:
diff changeset
   330
        st->filesize = statbuf.st_size;
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parents:
diff changeset
   331
    } /* else */
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parents:
diff changeset
   332
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parents:
diff changeset
   333
    st->modtime = statbuf.st_mtime;
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unc0rr
parents:
diff changeset
   334
    st->createtime = statbuf.st_ctime;
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parents:
diff changeset
   335
    st->accesstime = statbuf.st_atime;
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parents:
diff changeset
   336
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unc0rr
parents:
diff changeset
   337
    /* !!! FIXME: maybe we should just report full permissions? */
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parents:
diff changeset
   338
    st->readonly = access(filename, W_OK);
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parents:
diff changeset
   339
    return 1;
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diff changeset
   340
} /* __PHYSFS_platformStat */
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diff changeset
   341
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diff changeset
   342
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parents:
diff changeset
   343
#ifndef PHYSFS_PLATFORM_BEOS  /* BeOS has its own code in platform_beos.cpp */
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diff changeset
   344
#if (defined PHYSFS_NO_THREAD_SUPPORT)
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diff changeset
   345
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diff changeset
   346
void *__PHYSFS_platformGetThreadID(void) { return ((void *) 0x0001); }
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diff changeset
   347
void *__PHYSFS_platformCreateMutex(void) { return ((void *) 0x0001); }
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parents:
diff changeset
   348
void __PHYSFS_platformDestroyMutex(void *mutex) {}
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parents:
diff changeset
   349
int __PHYSFS_platformGrabMutex(void *mutex) { return 1; }
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parents:
diff changeset
   350
void __PHYSFS_platformReleaseMutex(void *mutex) {}
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diff changeset
   351
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diff changeset
   352
#else
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diff changeset
   353
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parents:
diff changeset
   354
typedef struct
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parents:
diff changeset
   355
{
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parents:
diff changeset
   356
    pthread_mutex_t mutex;
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parents:
diff changeset
   357
    pthread_t owner;
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parents:
diff changeset
   358
    PHYSFS_uint32 count;
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unc0rr
parents:
diff changeset
   359
} PthreadMutex;
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parents:
diff changeset
   360
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   361
13e2037ebc79 Try using PhysicsFS.
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parents:
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   362
void *__PHYSFS_platformGetThreadID(void)
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   363
{
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   364
    return ( (void *) ((size_t) pthread_self()) );
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   365
} /* __PHYSFS_platformGetThreadID */
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   366
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   367
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   368
void *__PHYSFS_platformCreateMutex(void)
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parents:
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   369
{
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   370
    int rc;
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   371
    PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));
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   372
    BAIL_IF_MACRO(!m, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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   373
    rc = pthread_mutex_init(&m->mutex, NULL);
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   374
    if (rc != 0)
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parents:
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   375
    {
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   376
        allocator.Free(m);
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   377
        BAIL_MACRO(PHYSFS_ERR_OS_ERROR, NULL);
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parents:
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   378
    } /* if */
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parents:
diff changeset
   379
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   380
    m->count = 0;
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   381
    m->owner = (pthread_t) 0xDEADBEEF;
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   382
    return ((void *) m);
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   383
} /* __PHYSFS_platformCreateMutex */
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parents:
diff changeset
   384
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parents:
diff changeset
   385
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parents:
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   386
void __PHYSFS_platformDestroyMutex(void *mutex)
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parents:
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   387
{
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diff changeset
   388
    PthreadMutex *m = (PthreadMutex *) mutex;
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parents:
diff changeset
   389
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   390
    /* Destroying a locked mutex is a bug, but we'll try to be helpful. */
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   391
    if ((m->owner == pthread_self()) && (m->count > 0))
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parents:
diff changeset
   392
        pthread_mutex_unlock(&m->mutex);
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parents:
diff changeset
   393
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diff changeset
   394
    pthread_mutex_destroy(&m->mutex);
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parents:
diff changeset
   395
    allocator.Free(m);
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parents:
diff changeset
   396
} /* __PHYSFS_platformDestroyMutex */
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unc0rr
parents:
diff changeset
   397
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unc0rr
parents:
diff changeset
   398
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unc0rr
parents:
diff changeset
   399
int __PHYSFS_platformGrabMutex(void *mutex)
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unc0rr
parents:
diff changeset
   400
{
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unc0rr
parents:
diff changeset
   401
    PthreadMutex *m = (PthreadMutex *) mutex;
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unc0rr
parents:
diff changeset
   402
    pthread_t tid = pthread_self();
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unc0rr
parents:
diff changeset
   403
    if (m->owner != tid)
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unc0rr
parents:
diff changeset
   404
    {
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unc0rr
parents:
diff changeset
   405
        if (pthread_mutex_lock(&m->mutex) != 0)
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unc0rr
parents:
diff changeset
   406
            return 0;
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parents:
diff changeset
   407
        m->owner = tid;
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unc0rr
parents:
diff changeset
   408
    } /* if */
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unc0rr
parents:
diff changeset
   409
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   410
    m->count++;
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unc0rr
parents:
diff changeset
   411
    return 1;
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unc0rr
parents:
diff changeset
   412
} /* __PHYSFS_platformGrabMutex */
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unc0rr
parents:
diff changeset
   413
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unc0rr
parents:
diff changeset
   414
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   415
void __PHYSFS_platformReleaseMutex(void *mutex)
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unc0rr
parents:
diff changeset
   416
{
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parents:
diff changeset
   417
    PthreadMutex *m = (PthreadMutex *) mutex;
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unc0rr
parents:
diff changeset
   418
    assert(m->owner == pthread_self());  /* catch programming errors. */
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unc0rr
parents:
diff changeset
   419
    assert(m->count > 0);  /* catch programming errors. */
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   420
    if (m->owner == pthread_self())
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   421
    {
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unc0rr
parents:
diff changeset
   422
        if (--m->count == 0)
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unc0rr
parents:
diff changeset
   423
        {
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unc0rr
parents:
diff changeset
   424
            m->owner = (pthread_t) 0xDEADBEEF;
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unc0rr
parents:
diff changeset
   425
            pthread_mutex_unlock(&m->mutex);
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   426
        } /* if */
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   427
    } /* if */
13e2037ebc79 Try using PhysicsFS.
unc0rr
parents:
diff changeset
   428
} /* __PHYSFS_platformReleaseMutex */
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unc0rr
parents:
diff changeset
   429
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unc0rr
parents:
diff changeset
   430
#endif /* !PHYSFS_NO_THREAD_SUPPORT */
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parents:
diff changeset
   431
#endif /* !PHYSFS_PLATFORM_BEOS */
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unc0rr
parents:
diff changeset
   432
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unc0rr
parents:
diff changeset
   433
#endif  /* PHYSFS_PLATFORM_POSIX */
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parents:
diff changeset
   434
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unc0rr
parents:
diff changeset
   435
/* end of posix.c ... */
13e2037ebc79 Try using PhysicsFS.
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parents:
diff changeset
   436