kc3-lang/SDL/src/video/wayland/SDL_waylandmessagebox.c

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• Hash : 413a2306
  Author :
  Date : 2021-04-04T10:47:06
  

  NULL passed to strcmp in Wayland_ShowMessageBox

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• src/video/wayland/SDL_waylandmessagebox.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2021 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"
  
  #if SDL_VIDEO_DRIVER_WAYLAND
  
  #include "SDL.h"
  #include <stdlib.h> /* popen/pclose/fgets */
  
  int
  Wayland_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
  {
      #define ZENITY_CONST(name, str) \
          const char *name = str; \
          const size_t name##_len = SDL_strlen(name);
      ZENITY_CONST(zenity, "zenity --question --switch --no-wrap --icon-name=dialog-")
      ZENITY_CONST(title, "--title=")
      ZENITY_CONST(message, "--text=")
      ZENITY_CONST(extrabutton, "--extra-button=")
      ZENITY_CONST(icon_info, "information")
      ZENITY_CONST(icon_warn, "warning")
      ZENITY_CONST(icon_error, "error")
      #undef ZENITY_CONST
  
      char *command, *output;
      size_t command_len, output_len;
      const char *icon;
      char *tmp;
      FILE *process;
      int i;
  
      /* Start by calculating the lengths of the strings. These commands can get
       * pretty long, so we need to dynamically allocate this.
       */
      command_len = zenity_len;
      output_len = 0;
      switch (messageboxdata->flags)
      {
      case SDL_MESSAGEBOX_ERROR:
          icon = icon_error;
          command_len += icon_error_len;
          break;
      case SDL_MESSAGEBOX_WARNING:
          icon = icon_warn;
          command_len += icon_warn_len;
          break;
      case SDL_MESSAGEBOX_INFORMATION:
      default:
          icon = icon_info;
          command_len += icon_info_len;
          break;
      }
      #define ADD_ARGUMENT(arg, value) \
          command_len += arg + 3; /* Two " and a space */ \
          if (messageboxdata->value != NULL) { \
              command_len += SDL_strlen(messageboxdata->value); \
          }
      ADD_ARGUMENT(title_len, title)
      ADD_ARGUMENT(message_len, message)
      #undef ADD_ARGUMENT
      for (i = 0; i < messageboxdata->numbuttons; i += 1) {
          command_len += extrabutton_len + 3; /* Two " and a space */
          if (messageboxdata->buttons[i].text != NULL) {
              const size_t button_len = SDL_strlen(messageboxdata->buttons[i].text);
              command_len += button_len;
              if (button_len > output_len) {
                  output_len = button_len;
              }
          }
      }
  
      /* Don't forget null terminators! */
      command_len += 1;
      output_len += 1;
  
      /* Now that we know the length of the command, allocate! */
      command = (char*) SDL_malloc(command_len + output_len);
      if (command == NULL) {
          return SDL_OutOfMemory();
      }
      output = command + command_len;
      command[0] = '\0';
      output[0] = '\0';
  
      /* Now we can build the command... */
      SDL_strlcpy(command, zenity, command_len);
      SDL_strlcat(command, icon, command_len);
      #define ADD_ARGUMENT(arg, value) \
          SDL_strlcat(command, " ", command_len); \
          SDL_strlcat(command, arg, command_len); \
          SDL_strlcat(command, "\"", command_len); \
          if (value != NULL) { \
              SDL_strlcat(command, value, command_len); \
          } \
          SDL_strlcat(command, "\"", command_len)
      ADD_ARGUMENT(title, messageboxdata->title);
      ADD_ARGUMENT(message, messageboxdata->message);
      for (i = 0; i < messageboxdata->numbuttons; i += 1) {
          ADD_ARGUMENT(extrabutton, messageboxdata->buttons[i].text);
      }
      #undef ADD_ARGUMENT
  
      /* ... then run it, finally. */
      process = popen(command, "r");
      if (process == NULL) {
          SDL_free(command);
          return SDL_SetError("zenity failed to run");
      }
  
      /* At this point, if no button ID is needed, we can just bail as soon as the
       * process has completed.
       */
      if (buttonid == NULL) {
          pclose(process);
          goto end;
      }
      *buttonid = -1;
  
      /* Read the result from stdout */
      tmp = fgets(output, output_len, process);
      pclose(process);
      if ((tmp == NULL) || (*tmp == '\0') || (*tmp == '\n')) {
          goto end; /* User simply closed the dialog */
      }
  
      /* It likes to add a newline... */
      tmp = SDL_strrchr(output, '\n');
      if (tmp != NULL) {
          *tmp = '\0';
      }
  
      /* Check which button got pressed */
      for (i = 0; i < messageboxdata->numbuttons; i += 1) {
          if (messageboxdata->buttons[i].text != NULL) {
              if (SDL_strcmp(output, messageboxdata->buttons[i].text) == 0) {
                  *buttonid = i;
                  break;
              }
          }
      }
  
  end:
      SDL_free(command);
      return 0;
  }
  
  #endif /* SDL_VIDEO_DRIVER_WAYLAND */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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