kc3-lang/SDL/src/loadso/os2/SDL_sysloadso.c

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• Hash : 3f1b5efc
  Author :
  Date : 2022-10-22T14:28:10
  

  os2 loadso improvements: - SDL_LoadObject: upon failure, strip the .dll extension and retry, but only if module name has no path. - SDL_LoadFunction: upon failure, retry with an underscore prepended, e.g. for gcc-built dlls.

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• src/loadso/os2/SDL_sysloadso.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #ifdef SDL_LOADSO_OS2
  
  /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  /* System dependent library loading routines                           */
  
  #include "SDL_loadso.h"
  #include "../../core/os2/SDL_os2.h"
  
  #define INCL_DOSMODULEMGR
  #define INCL_DOSERRORS
  #include <os2.h>
  
  void *
  SDL_LoadObject(const char *sofile)
  {
      ULONG   ulRC;
      HMODULE hModule;
      CHAR    acError[256];
      PSZ     pszModName;
  
      if (!sofile) {
          SDL_InvalidParamError("sofile");
          return NULL;
      }
  
      pszModName = OS2_UTF8ToSys(sofile);
      ulRC = DosLoadModule(acError, sizeof(acError), pszModName, &hModule);
  
      if (ulRC != NO_ERROR && !SDL_strrchr(pszModName, '\\') && !SDL_strrchr(pszModName, '/')) {
          /* strip .dll extension and retry only if name has no path. */
          size_t len = SDL_strlen(pszModName);
          if (len > 4 && SDL_strcasecmp(&pszModName[len - 4], ".dll") == 0) {
              pszModName[len - 4] = '\0';
              ulRC = DosLoadModule(acError, sizeof(acError), pszModName, &hModule);
          }
      }
      if (ulRC != NO_ERROR) {
          SDL_SetError("Failed loading %s: %s (E%u)", sofile, acError, ulRC);
          hModule = NULLHANDLE;
      }
      SDL_free(pszModName);
  
      return (void *)hModule;
  }
  
  void *
  SDL_LoadFunction(void *handle, const char *name)
  {
      ULONG   ulRC;
      PFN     pFN;
  
      ulRC = DosQueryProcAddr((HMODULE)handle, 0, name, &pFN);
      if (ulRC != NO_ERROR) {
          /* retry with an underscore prepended, e.g. for gcc-built dlls. */
          SDL_bool isstack;
          size_t len = SDL_strlen(name) + 1;
          char *_name = SDL_small_alloc(char, len + 1, &isstack);
          _name[0] = '_';
          SDL_memcpy(&_name[1], name, len);
          ulRC = DosQueryProcAddr((HMODULE)handle, 0, _name, &pFN);
          SDL_small_free(_name, isstack);
      }
      if (ulRC != NO_ERROR) {
          SDL_SetError("Failed loading procedure %s (E%u)", name, ulRC);
          return NULL;
      }
  
      return (void *)pFN;
  }
  
  void
  SDL_UnloadObject(void *handle)
  {
      if (handle != NULL) {
          DosFreeModule((HMODULE)handle);
      }
  }
  
  #endif /* SDL_LOADSO_OS2 */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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