kc3-lang/SDL/visualtest/src/rwhelper.c

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• Hash : b88ca1b4
  Author :
  Date : 2015-02-10T16:28:56
  

  the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.
  
  Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here.  Not 5 or 10 depending on the architecture.
  
  More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
  

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• visualtest/src/rwhelper.c

• /* See COPYING.txt for the full license governing this code. */
  /**
   * \file rwhelper.c
   *
   * Source file with some helper functions for working with SDL_RWops.
   */
  
  #include <SDL_test.h>
  #include "SDL_visualtest_sut_configparser.h"
  #include "SDL_visualtest_rwhelper.h"
  
  void
  SDLVisualTest_RWHelperResetBuffer(SDLVisualTest_RWHelperBuffer* buffer)
  {
      if(!buffer)
      {
          SDLTest_LogError("buffer argument cannot be NULL");
          return;
      }
      buffer->buffer_pos = 0;
      buffer->buffer_width = 0;
  }
  
  char
  SDLVisualTest_RWHelperReadChar(SDL_RWops* rw, SDLVisualTest_RWHelperBuffer* buffer)
  {
      if(!rw || !buffer)
          return 0;
      /* if the buffer has been consumed, we fill it up again */
      if(buffer->buffer_pos == buffer->buffer_width)
      {
          buffer->buffer_width = SDL_RWread(rw, buffer->buffer, 1, RWOPS_BUFFER_LEN);
          buffer->buffer_pos = 0;
          if(buffer->buffer_width == 0)
              return 0;
      }
      buffer->buffer_pos++;
      return buffer->buffer[buffer->buffer_pos - 1];
  }
  
  /* does not include new lines in the buffer and adds a trailing null character */
  char*
  SDLVisualTest_RWHelperReadLine(SDL_RWops* rw, char* str, int size,
                                 SDLVisualTest_RWHelperBuffer* buffer,
                                 char comment_char)
  {
      char ch;
      int current_pos, done;
      if(!rw)
      {
          SDLTest_LogError("rw argument cannot be NULL");
          return NULL;
      }
      if(!str)
      {
          SDLTest_LogError("str argument cannot be NULL");
          return NULL;
      }
      if(!buffer)
      {
          SDLTest_LogError("buffer argument cannot be NULL");
          return NULL;
      }
      if(size <= 0)
      {
          SDLTest_LogError("size argument should be positive");
          return NULL;
      }
  
      done = 0;
      while(!done)
      {
          /* ignore leading whitespace */
          for(ch = SDLVisualTest_RWHelperReadChar(rw, buffer); ch && SDL_isspace(ch);
              ch = SDLVisualTest_RWHelperReadChar(rw, buffer));
  
          for(current_pos = 0;
              ch && ch != '\n' && ch != '\r' && ch != comment_char;
              current_pos++)
          {
              str[current_pos] = ch;
              if(current_pos >= size - 2)
              {
                  current_pos++;
                  break;
              }
              ch = SDLVisualTest_RWHelperReadChar(rw, buffer);
          }
  
          done = 1;
          if(ch == comment_char) /* discard all characters until the next line */
          {
              do
              {
                  ch = SDLVisualTest_RWHelperReadChar(rw, buffer);
              }while(ch && ch != '\n' && ch != '\r');
  
              if(current_pos == 0)
                  done = 0;
          }
      }
      if(current_pos == 0)
          return NULL;
  
      str[current_pos] = '\0';
      return str;
  }
  
  /* Lines with all whitespace are ignored */
  int
  SDLVisualTest_RWHelperCountNonEmptyLines(SDL_RWops* rw,
                                           SDLVisualTest_RWHelperBuffer* buffer,
                                           char comment_char)
  {
      int num_lines = 0;
      char str[MAX_SUTOPTION_LINE_LENGTH];
      if(!rw)
      {
          SDLTest_LogError("rw argument cannot be NULL");
          return -1;
      }
      if(!buffer)
      {
          SDLTest_LogError("buffer argument cannot be NULL");
          return -1;
      }
      while(SDLVisualTest_RWHelperReadLine(rw, str, MAX_SUTOPTION_LINE_LENGTH,
                                           buffer, comment_char))
          num_lines++;
      return num_lines;
  }

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