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-/****************************************************************************
-*
-* SciTech OS Portability Manager Library
-*
-* ========================================================================
-*
-* The contents of this file are subject to the SciTech MGL Public
-* License Version 1.0 (the "License"); you may not use this file
-* except in compliance with the License. You may obtain a copy of
-* the License at http://www.scitechsoft.com/mgl-license.txt
-*
-* Software distributed under the License is distributed on an
-* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
-* implied. See the License for the specific language governing
-* rights and limitations under the License.
-*
-* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
-*
-* The Initial Developer of the Original Code is SciTech Software, Inc.
-* All Rights Reserved.
-*
-* ========================================================================
-*
-* Language: ANSI C
-* Environment: Any
-*
-* Description: Module containing code common to all platforms.
-*
-****************************************************************************/
-
-#include "pmapi.h"
-#include "drvlib/os/os.h"
-#if defined(__WIN32_VXD__) || defined(__OS2_VDD__) || defined(__NT_DRIVER__)
-#include "sdd/sddhelp.h"
-#else
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#endif
-
-/*---------------------------- Global variables ---------------------------*/
-
-/* {secret} */
-long _VARAPI ___drv_os_type = _OS_UNSUPPORTED;
-static char localBPDPath[PM_MAX_PATH] = "";
-
-/*----------------------------- Implementation ----------------------------*/
-
-/****************************************************************************
-PARAMETERS:
-path - Local path to the Nucleus BPD driver files.
-
-REMARKS:
-This function is used by the application program to override the location
-of the Nucleus driver files that are loaded. Normally the loader code
-will look in the system Nucleus directories first, then in the 'drivers'
-directory relative to the current working directory, and finally relative
-to the MGL_ROOT environment variable. By default the local BPD path is
-always set to the current directory if not initialised.
-****************************************************************************/
-void PMAPI PM_setLocalBPDPath(
- const char *path)
-{
- PM_init();
- strncpy(localBPDPath,path,sizeof(localBPDPath));
- localBPDPath[sizeof(localBPDPath)-1] = 0;
-}
-
-/****************************************************************************
-PARAMETERS:
-bpdpath - Place to store the actual path to the file
-cachedpath - Place to store the cached BPD driver path
-trypath - Path to try to find the BPD file in
-subpath - Optional sub path to append to trypath
-dllname - Name of the Binary Portable DLL to load
-
-RETURNS:
-True if found, false if not.
-
-REMARKS:
-Trys the specified path to see if the BPD file can be found or not. If so,
-the path used is returned in bpdpath and cachedpath.
-****************************************************************************/
-static ibool TryPath(
- char *bpdpath,
- char *cachedpath,
- const char *trypath,
- const char *subpath,
- const char *dllname)
-{
- char filename[256];
- FILE *f;
-
- strcpy(bpdpath, trypath);
- PM_backslash(bpdpath);
- strcat(bpdpath,subpath);
- PM_backslash(bpdpath);
- strcpy(filename,bpdpath);
- strcat(filename,dllname);
- if ((f = fopen(filename,"rb")) == NULL)
- return false;
- if (cachedpath)
- strcpy(cachedpath,bpdpath);
- fclose(f);
- return true;
-}
-
-/****************************************************************************
-RETURNS:
-True if local override enabled, false if not.
-
-REMARKS:
-Tests to see if the local override option is enabled, and if so it will
-look for the Nucleus drivers in the local application directories in
-preference to the Nucleus system directories.
-****************************************************************************/
-static ibool GetLocalOverride(void)
-{
- char filename[256];
- FILE *f;
- static ibool local_override = -1;
-
- if (local_override == -1) {
- local_override = false;
- strcpy(filename,PM_getNucleusPath());
- PM_backslash(filename);
- strcat(filename,"graphics.ini");
- if ((f = fopen(filename,"r")) != NULL) {
- while (!feof(f) && fgets(filename,sizeof(filename),f)) {
- if (strnicmp(filename,"uselocal",8) == 0) {
- local_override = ((*(filename+9) - '0') == 1);
- break;
- }
- }
- fclose(f);
- }
- }
- return local_override;
-}
-
-/****************************************************************************
-DESCRIPTION:
-Sets the location of the debug log file.
-
-HEADER:
-pmapi.h
-
-PARAMETERS:
-dllname - Name of the Binary Portable DLL to load
-bpdpath - Place to store the actual path to the file
-
-RETURNS:
-True if found, false if not.
-
-REMARKS:
-Finds the location of a specific Binary Portable DLL, by searching all
-the standard SciTech Nucleus driver locations.
-****************************************************************************/
-ibool PMAPI PM_findBPD(
- const char *dllname,
- char *bpdpath)
-{
- static char cachedpath[PM_MAX_PATH] = "";
-
- /* On the first call determine the path to the Nucleus drivers */
- if (cachedpath[0] == 0) {
- /* First try in the global system Nucleus driver path if
- * the local override setting is not enabled.
- */
- PM_init();
- if (!GetLocalOverride()) {
- if (TryPath(bpdpath,cachedpath,PM_getNucleusPath(),"",dllname))
- return true;
- }
-
- /* Next try in the local application directory if available */
- if (localBPDPath[0] != 0) {
- if (TryPath(bpdpath,cachedpath,localBPDPath,"",dllname))
- return true;
- }
- else {
-#if !defined(__WIN32_VXD__) && !defined(__NT_DRIVER__)
- char *mgl_root;
- if ((mgl_root = getenv("MGL_ROOT")) != NULL) {
- if (TryPath(bpdpath,cachedpath,mgl_root,"drivers",dllname))
- return true;
- }
-#endif
- PM_getCurrentPath(bpdpath,PM_MAX_PATH);
- if (TryPath(bpdpath,cachedpath,bpdpath,"drivers",dllname))
- return true;
- }
-
- /* Finally try in the global system path again so that we
- * will still find the drivers in the global system path if
- * the local override option is on, but the application does
- * not have any local override drivers.
- */
- if (TryPath(bpdpath,cachedpath,PM_getNucleusPath(),"",dllname))
- return true;
-
- /* Whoops, we can't find the BPD file! */
- return false;
- }
-
- /* Always try in the previously discovered path */
- return TryPath(bpdpath,NULL,cachedpath,"",dllname);
-}
-
-/****************************************************************************
-REMARKS:
-Copies a string into another, and returns dest + strlen(src).
-****************************************************************************/
-static char *_stpcpy(
- char *_dest,
- const char *_src)
-{
- if (!_dest || !_src)
- return 0;
- while ((*_dest++ = *_src++) != 0)
- ;
- return --_dest;
-}
-
-/****************************************************************************
-REMARKS:
-Copies a string into another, stopping at the maximum length. The string
-is properly terminated (unlike strncpy).
-****************************************************************************/
-static void safe_strncpy(
- char *dst,
- const char *src,
- unsigned maxlen)
-{
- if (dst) {
- if(strlen(src) >= maxlen) {
- strncpy(dst, src, maxlen);
- dst[maxlen] = 0;
- }
- else
- strcpy(dst, src);
- }
-}
-
-/****************************************************************************
-REMARKS:
-Determins if the dot separator is present in the string.
-****************************************************************************/
-static int findDot(
- char *p)
-{
- if (*(p-1) == '.')
- p--;
- switch (*--p) {
- case ':':
- if (*(p-2) != '\0')
- break;
- case '/':
- case '\\':
- case '\0':
- return true;
- }
- return false;
-}
-
-/****************************************************************************
-DESCRIPTION:
-Make a full pathname from split components.
-
-HEADER:
-pmapi.h
-
-PARAMETERS:
-path - Place to store full path
-drive - Drive component for path
-dir - Directory component for path
-name - Filename component for path
-ext - Extension component for path
-
-REMARKS:
-Function to make a full pathname from split components. Under Unix the
-drive component will usually be empty. If the drive, dir, name, or ext
-parameters are null or empty, they are not inserted in the path string.
-Otherwise, if the drive doesn't end with a colon, one is inserted in the
-path. If the dir doesn't end in a slash, one is inserted in the path.
-If the ext doesn't start with a dot, one is inserted in the path.
-
-The maximum sizes for the path string is given by the constant PM_MAX_PATH,
-which includes space for the null-terminator.
-
-SEE ALSO:
-PM_splitPath
-****************************************************************************/
-void PMAPI PM_makepath(
- char *path,
- const char *drive,
- const char *dir,
- const char *name,
- const char *ext)
-{
- if (drive && *drive) {
- *path++ = *drive;
- *path++ = ':';
- }
- if (dir && *dir) {
- path = _stpcpy(path,dir);
- if (*(path-1) != '\\' && *(path-1) != '/')
-#ifdef __UNIX__
- *path++ = '/';
-#else
- *path++ = '\\';
-#endif
- }
- if (name)
- path = _stpcpy(path,name);
- if (ext && *ext) {
- if (*ext != '.')
- *path++ = '.';
- path = _stpcpy(path,ext);
- }
- *path = 0;
-}
-
-/****************************************************************************
-DESCRIPTION:
-Split a full pathname into components.
-
-HEADER:
-pmapi.h
-
-PARAMETERS:
-path - Full path to split
-drive - Drive component for path
-dir - Directory component for path
-name - Filename component for path
-ext - Extension component for path
-
-RETURNS:
-Flags indicating what components were parsed.
-
-REMARKS:
-Function to split a full pathmame into separate components in the form
-
- X:\DIR\SUBDIR\NAME.EXT
-
-and splits path into its four components. It then stores those components
-in the strings pointed to by drive, dir, name and ext. (Each component is
-required but can be a NULL, which means the corresponding component will be
-parsed but not stored).
-
-The maximum sizes for these strings are given by the constants PM_MAX_DRIVE
-and PM_MAX_PATH. PM_MAX_DRIVE is always 4, and PM_MAX_PATH is usually at
-least 256 characters. Under Unix the dir, name and ext components may be
-up to the full path in length.
-
-SEE ALSO:
-PM_makePath
-****************************************************************************/
-int PMAPI PM_splitpath(
- const char *path,
- char *drive,
- char *dir,
- char *name,
- char *ext)
-{
- char *p;
- int temp,ret;
- char buf[PM_MAX_PATH+2];
-
- /* Set all string to default value zero */
- ret = 0;
- if (drive) *drive = 0;
- if (dir) *dir = 0;
- if (name) *name = 0;
- if (ext) *ext = 0;
-
- /* Copy filename into template up to PM_MAX_PATH characters */
- p = buf;
- if ((temp = strlen(path)) > PM_MAX_PATH)
- temp = PM_MAX_PATH;
- *p++ = 0;
- strncpy(p, path, temp);
- *(p += temp) = 0;
-
- /* Split the filename and fill corresponding nonzero pointers */
- temp = 0;
- for (;;) {
- switch (*--p) {
- case '.':
- if (!temp && (*(p+1) == '\0'))
- temp = findDot(p);
- if ((!temp) && ((ret & PM_HAS_EXTENSION) == 0)) {
- ret |= PM_HAS_EXTENSION;
- safe_strncpy(ext, p, PM_MAX_PATH - 1);
- *p = 0;
- }
- continue;
- case ':':
- if (p != &buf[2])
- continue;
- case '\0':
- if (temp) {
- if (*++p)
- ret |= PM_HAS_DIRECTORY;
- safe_strncpy(dir, p, PM_MAX_PATH - 1);
- *p-- = 0;
- break;
- }
- case '/':
- case '\\':
- if (!temp) {
- temp++;
- if (*++p)
- ret |= PM_HAS_FILENAME;
- safe_strncpy(name, p, PM_MAX_PATH - 1);
- *p-- = 0;
- if (*p == 0 || (*p == ':' && p == &buf[2]))
- break;
- }
- continue;
- case '*':
- case '?':
- if (!temp)
- ret |= PM_HAS_WILDCARDS;
- default:
- continue;
- }
- break;
- }
- if (*p == ':') {
- if (buf[1])
- ret |= PM_HAS_DRIVE;
- safe_strncpy(drive, &buf[1], PM_MAX_DRIVE - 1);
- }
- return ret;
-}
-
-/****************************************************************************
-DESCRIPTION:
-Block until a specific time has elapsed since the last call
-
-HEADER:
-pmapi.h
-
-PARAMETERS:
-milliseconds - Number of milliseconds for delay
-
-REMARKS:
-This function will block the calling thread or process until the specified
-number of milliseconds have passed since the /last/ call to this function.
-The first time this function is called, it will return immediately. On
-subsquent calls it will block until the specified time has elapsed, or it
-will return immediately if the time has already elapsed.
-
-This function is useful to provide constant time functionality in a
-program, such as a frame rate limiter for graphics applications etc.
-
-SEE ALSO:
-PM_sleep
-****************************************************************************/
-void PMAPI PM_blockUntilTimeout(
- ulong milliseconds)
-{
- ulong microseconds = milliseconds * 1000L,msDelay;
- static LZTimerObject tm;
- static ibool firstTime = true;
-
- if (firstTime) {
- firstTime = false;
- LZTimerOnExt(&tm);
- }
- else {
- if ((msDelay = (microseconds - LZTimerLapExt(&tm)) / 1000L) > 0)
- PM_sleep(msDelay);
- while (LZTimerLapExt(&tm) < microseconds)
- ;
- LZTimerOffExt(&tm);
- LZTimerOnExt(&tm);
- }
-}
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