/*

 * Win32 support routines for PhysicsFS.

 *

 * Please see the file LICENSE in the source's root directory.

 *

 *  This file written by Ryan C. Gordon.

 */

#if (defined __STRICT_ANSI__)

#define __PHYSFS_DOING_STRICT_ANSI__

#endif

#include <windows.h>

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

const char *__PHYSFS_platformDirSeparator = "\\";

static const char *win32strerror(void)

{

    static TCHAR msgbuf[255];

    FormatMessage(

        FORMAT_MESSAGE_FROM_SYSTEM |

        FORMAT_MESSAGE_IGNORE_INSERTS,

        NULL,

        GetLastError(),

        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */

        msgbuf,

        sizeof (msgbuf) / sizeof (TCHAR),

        NULL 

    );

    return((const char *) msgbuf);

} /* win32strerror */

char **__PHYSFS_platformDetectAvailableCDs(void)

{

    char **retval = (char **) malloc(sizeof (char *));

    int cd_count = 1;  /* We count the NULL entry. */

    char drive_str[4] = "x:\\";

    for (drive_str[0] = 'A'; drive_str[0] <= 'Z'; drive_str[0]++)

    {

        if (GetDriveType(drive_str) == DRIVE_CDROM)

        {

            char **tmp = realloc(retval, sizeof (char *) * cd_count + 1);

            if (tmp)

            {

                retval = tmp;

                retval[cd_count-1] = (char *) malloc(4);

                if (retval[cd_count-1])

                {

                    strcpy(retval[cd_count-1], drive_str);

                    cd_count++;

                } /* if */

            } /* if */

        } /* if */

    } /* for */

    retval[cd_count - 1] = NULL;

    return(retval);

} /* __PHYSFS_detectAvailableCDs */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

    DWORD buflen = 0;

    char *retval = NULL;

    char *filepart = NULL;

    if (strchr(argv0, '\\') != NULL)   /* default behaviour can handle this. */

        return(NULL);

    buflen = SearchPath(NULL, argv0, NULL, buflen, NULL, NULL);

    BAIL_IF_MACRO(!retval, ERR_OUT_OF_MEMORY, NULL);

    SearchPath(NULL, argv0, NULL, buflen, retval, &filepart);

    return(retval);

} /* __PHYSFS_platformCalcBaseDir */

char *__PHYSFS_platformGetUserName(void)

{

    DWORD bufsize = 0;

    LPTSTR retval = NULL;

    if (GetUserName(NULL, &bufsize) == 0)  /* This SHOULD fail. */

    {

        retval = (LPTSTR) malloc(bufsize);

        BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

        if (GetUserName(retval, &bufsize) == 0)  /* ?! */

        {

            free(retval);

            retval = NULL;

        } /* if */

    } /* if */

    return((char *) retval);

} /* __PHYSFS_platformGetUserName */

static char *copyEnvironmentVariable(const char *varname)

{

    const char *envr = getenv(varname);

    char *retval = NULL;

    if (envr != NULL)

    {

        retval = malloc(strlen(envr) + 1);

        if (retval != NULL)

            strcpy(retval, envr);

    } /* if */

    return(retval);

} /* copyEnvironmentVariable */

char *__PHYSFS_platformGetUserDir(void)

{

    char *home = copyEnvironmentVariable("HOME");

    const char *homedrive = getenv("HOMEDRIVE");

    const char *homepath = getenv("HOMEPATH");

    if (home != NULL)

        return(home);

    if ((homedrive != NULL) && (homepath != NULL))

    {

        char *retval = (char *) malloc(strlen(homedrive)+strlen(homepath)+2);

        if (retval != NULL)

        {

            strcpy(retval, homedrive);

            if ((homepath[0] != '\\') &&

                (homedrive[strlen(homedrive)-1] != '\\'))

            {

                strcat(retval, "\\");

            } /* if */

            strcat(retval, homepath);

            return(retval);

        } /* if */

    } /* if */

    return(NULL);  /* fall through to default rules. */

} /* __PHYSFS_platformGetUserDir */

int __PHYSFS_platformGetThreadID(void)

{

    return((int) GetCurrentThreadId());

} /* __PHYSFS_platformGetThreadID */

/* ...make this Cygwin AND Visual C friendly... */

int __PHYSFS_platformStricmp(const char *x, const char *y)

{

    int ux, uy;

    do

    {

        ux = toupper((int) *x);

        uy = toupper((int) *y);

        if (ux > uy)

            return(1);

        else if (ux < uy)

            return(-1);

        x++;

        y++;

    } while ((ux) && (uy));

    return(0);

} /* __PHYSFS_platformStricmp */

int __PHYSFS_platformExists(const char *fname)

{

    return(GetFileAttributes(fname) != 0xffffffff);

} /* __PHYSFS_platformExists */

int __PHYSFS_platformIsSymLink(const char *fname)

{

    return(0);  /* no symlinks on win32. */

} /* __PHYSFS_platformIsSymlink */

int __PHYSFS_platformIsDirectory(const char *fname)

{

    return((GetFileAttributes(fname) & FILE_ATTRIBUTE_DIRECTORY) != 0);

} /* __PHYSFS_platformIsDirectory */

char *__PHYSFS_platformCvtToDependent(const char *prepend,

                                      const char *dirName,

                                      const char *append)

{

    int len = ((prepend) ? strlen(prepend) : 0) +

              ((append) ? strlen(append) : 0) +

              strlen(dirName) + 1;

    char *retval = malloc(len);

    char *p;

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

    if (prepend)

        strcpy(retval, prepend);

    else

        retval[0] = '\0';

    strcat(retval, dirName);

    if (append)

        strcat(retval, append);

    for (p = strchr(retval, '/'); p != NULL; p = strchr(p + 1, '/'))

        *p = '\\';

    return(retval);

} /* __PHYSFS_platformCvtToDependent */

/* Much like my college days, try to sleep for 10 milliseconds at a time... */

void __PHYSFS_platformTimeslice(void)

{

    Sleep(10);

} /* __PHYSFS_platformTimeslice */

LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname,

                                                  int omitSymLinks)

{

    LinkedStringList *retval = NULL;

    LinkedStringList *l = NULL;

    LinkedStringList *prev = NULL;

    HANDLE dir;

    WIN32_FIND_DATA ent;

    dir = FindFirstFile(dirname, &ent);

    BAIL_IF_MACRO(dir == INVALID_HANDLE_VALUE, win32strerror(), NULL);

    for (; FindNextFile(dir, &ent) != 0; )

    {

        if (strcmp(ent.cFileName, ".") == 0)

            continue;

        if (strcmp(ent.cFileName, "..") == 0)

            continue;

        l = (LinkedStringList *) malloc(sizeof (LinkedStringList));

        if (l == NULL)

            break;

        l->str = (char *) malloc(strlen(ent.cFileName) + 1);

        if (l->str == NULL)

        {

            free(l);

            break;

        } /* if */

        strcpy(l->str, ent.cFileName);

        if (retval == NULL)

            retval = l;

        else

            prev->next = l;

        prev = l;

        l->next = NULL;

    } /* while */

    FindClose(dir);

    return(retval);

} /* __PHYSFS_platformEnumerateFiles */

int __PHYSFS_platformFileLength(FILE *handle)

{

    fpos_t curpos;

    int retval;

    fgetpos(handle, &curpos);

    fseek(handle, 0, SEEK_END);

    retval = ftell(handle);

    fsetpos(handle, &curpos);

    return(retval);

} /* __PHYSFS_platformFileLength */

char *__PHYSFS_platformCurrentDir(void)

{

    LPTSTR retval;

    DWORD buflen = 0;

    buflen = GetCurrentDirectory(buflen, NULL);

    retval = (LPTSTR) malloc(buflen);

    GetCurrentDirectory(buflen, retval);

    return((char *) retval);

} /* __PHYSFS_platformCurrentDir */

char *__PHYSFS_platformRealPath(const char *path)

{

    /* !!! FIXME: This isn't supported on CygWin! */

} /* __PHYSFS_platformRealPath */

int __PHYSFS_platformMkDir(const char *path)

{

    DWORD rc = CreateDirectory(path, NULL);

    BAIL_IF_MACRO(rc == 0, win32strerror(), 0);

    return(1);

} /* __PHYSFS_platformMkDir */

/* end of win32.c ... */