platform/unix.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 09 Jul 2001 04:15:35 +0000
changeset 28 529214f57d1b
parent 23 bd6ba9c8717c
child 39 bc29e1ee7ef6
permissions -rw-r--r--
Added PHYSFS_fileLength(). Bleh.
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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 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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#if (defined __STRICT_ANSI__)
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#define __PHYSFS_DOING_STRICT_ANSI__
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#endif
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/*
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 * We cheat a little: I want the symlink version of stat() (lstat), and
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 *  GCC/Linux will not declare it if compiled with the -ansi flag.
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 *  If you are really lacking symlink support on your platform,
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 *  you should #define __PHYSFS_NO_SYMLINKS__ before compiling this
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 *  file. That will open a security hole, though, if you really DO have
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 *  symlinks on your platform; it renders PHYSFS_permitSymbolicLinks(0)
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 *  useless, since every symlink will be reported as a regular file/dir.
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 */
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#if (defined __PHYSFS_DOING_STRICT_ANSI__)
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#undef __STRICT_ANSI__
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#endif
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#include <stdio.h>
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#if (defined __PHYSFS_DOING_STRICT_ANSI__)
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#define __STRICT_ANSI__
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <pthread.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 <dirent.h>
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#include <time.h>
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#include <errno.h>
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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const char *__PHYSFS_platformDirSeparator = "/";
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char **__PHYSFS_platformDetectAvailableCDs(void)
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{
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    /* !!! write me. */
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    char **retval = malloc(sizeof (char *));
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    if (retval != NULL)
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        *retval = NULL;
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    return(retval);
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} /* __PHYSFS_detectAvailableCDs */
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static char *copyEnvironmentVariable(const char *varname)
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{
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    const char *envr = getenv(varname);
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    char *retval = NULL;
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    if (envr != NULL)
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    {
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        retval = malloc(strlen(envr) + 1);
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        if (retval != NULL)
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            strcpy(retval, envr);
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    } /* if */
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    return(retval);
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} /* copyEnvironmentVariable */
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/* !!! this is ugly. */
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char *__PHYSFS_platformCalcBaseDir(const char *argv0)
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{
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    /* If there isn't a path on argv0, then look through the $PATH for it. */
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    char *retval = NULL;
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    char *envr;
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    char *start;
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    char *ptr;
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    char *exe;
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    if (strchr(argv0, '/') != NULL)   /* default behaviour can handle this. */
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        return(NULL);
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    envr = copyEnvironmentVariable("PATH");
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    BAIL_IF_MACRO(!envr, NULL, NULL);
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    start = envr;
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    do
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    {
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        ptr = strchr(start, ':');
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        if (ptr)
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            *ptr = '\0';
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        exe = (char *) malloc(strlen(start) + strlen(argv0) + 2);
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        if (!exe)
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        {
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            free(envr);
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            BAIL_IF_MACRO(1, ERR_OUT_OF_MEMORY, NULL);
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        } /* if */
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        strcpy(exe, start);
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        if (start[strlen(start) - 1] != '/')
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            strcat(start, "/");
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        strcat(start, argv0);
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        if (access(exe, X_OK) != 0)
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            free(exe);
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        else
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        {
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            retval = exe;
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            strcpy(retval, start);  /* i'm lazy. piss off. */
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            break;
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        } /* else */
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        start = ptr + 1;
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    } while (ptr != NULL);
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    free(envr);
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    return(retval);
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} /* __PHYSFS_platformCalcBaseDir */
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static char *getUserNameByUID(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_name != NULL))
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    {
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        retval = malloc(strlen(pw->pw_name) + 1);
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        if (retval != NULL)
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            strcpy(retval, pw->pw_name);
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    } /* if */
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    return(retval);
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} /* getUserNameByUID */
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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))
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    {
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        retval = malloc(strlen(pw->pw_dir) + 1);
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        if (retval != NULL)
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            strcpy(retval, pw->pw_dir);
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    } /* if */
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   158
    
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   159
    return(retval);
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   160
} /* getUserDirByUID */
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   161
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17
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char *__PHYSFS_platformGetUserName(void)
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{
20
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    char *retval = getUserNameByUID();
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   166
    if (retval == NULL)
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        retval = copyEnvironmentVariable("USER");
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    return(retval);
17
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} /* __PHYSFS_platformGetUserName */
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char *__PHYSFS_platformGetUserDir(void)
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{
20
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    char *retval = copyEnvironmentVariable("HOME");
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    if (retval == NULL)
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        retval = getUserDirByUID();
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    return(retval);
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} /* __PHYSFS_platformGetUserDir */
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int __PHYSFS_platformGetThreadID(void)
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{
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    return((int) pthread_self());
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} /* __PHYSFS_platformGetThreadID */
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20
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/* -ansi and -pedantic flags prevent use of strcasecmp() on Linux. */
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int __PHYSFS_platformStricmp(const char *x, const char *y)
17
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{
20
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    int ux, uy;
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    do
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    {
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        ux = toupper((int) *x);
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        uy = toupper((int) *y);
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        if (ux > uy)
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            return(1);
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        else if (ux < uy)
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            return(-1);
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        x++;
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        y++;
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    } while ((ux) && (uy));
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   203
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    return(0);
17
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} /* __PHYSFS_platformStricmp */
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20
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int __PHYSFS_platformExists(const char *fname)
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{
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    struct stat statbuf;
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    return(stat(fname, &statbuf) == 0);
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   212
} /* __PHYSFS_platformExists */
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   213
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   214
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int __PHYSFS_platformIsSymLink(const char *fname)
17
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{
20
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#if (defined __PHYSFS_NO_SYMLINKS__)
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    return(0);
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   219
#else
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    struct stat statbuf;
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    int retval = 0;
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   223
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   224
    if (lstat(fname, &statbuf) == 0)
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   225
    {
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        if (S_ISLNK(statbuf.st_mode))
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            retval = 1;
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diff changeset
   228
    } /* if */
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   229
    
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   230
    return(retval);
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   231
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   232
#endif
17
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   233
} /* __PHYSFS_platformIsSymlink */
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   236
int __PHYSFS_platformIsDirectory(const char *fname)
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   237
{
20
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   238
    struct stat statbuf;
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   239
    int retval = 0;
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   240
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   241
    if (stat(fname, &statbuf) == 0)
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diff changeset
   242
    {
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   243
        if (S_ISDIR(statbuf.st_mode))
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   244
            retval = 1;
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diff changeset
   245
    } /* if */
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diff changeset
   246
    
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   247
    return(retval);
17
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   248
} /* __PHYSFS_platformIsDirectory */
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20
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   251
char *__PHYSFS_platformCvtToDependent(const char *prepend,
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                                      const char *dirName,
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   253
                                      const char *append)
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   254
{
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   255
    int len = ((prepend) ? strlen(prepend) : 0) +
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              ((append) ? strlen(append) : 0) +
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              strlen(dirName) + 1;
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   258
    char *retval = malloc(len);
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   259
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    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
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   261
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    /* platform-independent notation is Unix-style already.  :)  */
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   263
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   264
    if (prepend)
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   265
        strcpy(retval, prepend);
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diff changeset
   266
    else
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        retval[0] = '\0';
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   268
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   269
    strcat(retval, dirName);
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   270
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   271
    if (append)
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   272
        strcat(retval, append);
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   273
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   274
    return(retval);
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   275
} /* __PHYSFS_platformCvtToDependent */
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/* Much like my college days, try to sleep for 10 milliseconds at a time... */
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void __PHYSFS_platformTimeslice(void)
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{
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    struct timespec napTime;
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    napTime.tv_sec = 0;
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    napTime.tv_nsec = 10 * 1000 * 1000;  /* specified in nanoseconds. */
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    nanosleep(&napTime, NULL);           /* don't care if it fails. */
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} /* __PHYSFS_platformTimeslice */
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LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname)
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{
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    LinkedStringList *retval = NULL;
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    LinkedStringList *l = NULL;
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    LinkedStringList *prev = NULL;
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    DIR *dir;
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    struct dirent *ent;
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    errno = 0;
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    dir = opendir(dirname);
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    BAIL_IF_MACRO(dir == NULL, strerror(errno), NULL);
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    while (1)
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    {
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        ent = readdir(dir);
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        if (ent == NULL)   /* we're done. */
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            break;
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        l = (LinkedStringList *) malloc(sizeof (LinkedStringList));
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        if (l != NULL)
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            break;
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        l->str = (char *) malloc(strlen(ent->d_name) + 1);
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        if (l->str == NULL)
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        {
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            free(l);
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            break;
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        } /* if */
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        if (retval == NULL)
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            retval = l;
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        else
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            prev->next = l;
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        prev = l;
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        l->next = NULL;
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    } /* while */
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    closedir(dir);
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    return(retval);
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} /* __PHYSFS_platformEnumerateFiles */
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28
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int __PHYSFS_platformFileLength(FILE *handle)
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{
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    struct stat statbuf;
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    errno = 0;
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    BAIL_IF_MACRO(fstat(fileno(handle), &statbuf) == -1, strerror(errno), -1);
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    return(statbuf.st_size);
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} /* __PHYSFS_platformFileLength */
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17
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/* end of unix.c ... */
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