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DOS uses Carriage Return (\r), Line Feed (\n) for line termination, where as UNIX uses only Line Feed for line termination, APPLE uses carriage return for same purpose. Here is a program which makes one operating system’s text file compatible with other operating system’s text file by conevrting the line feeds and carriage returns according to the system.

enum {DOS_TO_UNIX, DOS_TO_APPLE, UNIX_APPLE_TO_DOS};
 
int ConvertCRLF(char* file, int mode)
{
  //LF-CRLF Converts anything (Unix or Apple) to the DOS standard CRLF.
  //CRLF-CR Converts DOS text to the Apple standard CR.
  //CRLF-LF Converts DOS text to the Unix standard LF.
 
  FILE *fp = NULL;
  FILE *wfp = NULL;
  int ch = 0;
 
  fp = fopen(file, "rw+");
  if (!fp)
  {
    return -1;
  }
 
  wfp = fopen("temp.file", "rw+");
  if (!fp)
  {
    return -1;
  }
 
  while(!feof(fp))
  {
    ch = fgetc(fp);
    switch(mode)
    {
      case DOS_TO_UNIX:
        chnext = fgetc(fp);
        if ((ch == '\r') && (chnext == '\n'))
        {
          fputc('\n', wfp);
        }
        else
        {
          fputc(ch, wfp);
          fputc(chnext, wfp);
        }
        break;
      case DOS_TO_APPLE:
        chnext = fgetc(fp);
        if ((ch == '\r') && (chnext == '\n'))
        {
          fputc('\r', wfp);
        }
        else
        {
          fputc(ch, wfp);
          fputc(chnext, wfp);
        }
        break;
      case UNIX_APPLE_TO_DOS:
        if ((ch == '\r') || (ch == '\n'))
        {
          fputc('\r', wfp);
          fputc('\n', wfp);
        }
        else
        {
          fputc(ch, wfp);
        }
        break;
     }
  }
  return 0;
}

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This entry was written by ponnada and posted on October 31, 2006 at 11:13 am and filed under C Tidbits. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.