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  1. #define NULL	0
  2.  
  3. ...
  4.  
  5. typedef struct _iobuf	{
  6. 	int cnt;	/* Characters left */
  7. 	char *ptr;	/* Next character's place */
  8. 	char *base;	/* Buffer's place */
  9. 	int flag;	/* Way of accesing the file */
  10. 	int fd;		/* File Descriptor */
  11. }FILE;
  12.  
  13. extern FILE _iob[20];
  14.  
  15. enum _flags	{
  16. 	_READ = 01,
  17. 	_WRITE = 02;
  18. 	_UNBUF = 04,
  19. 	_EOF = 010,
  20. 	_ERR = 020
  21. };
  22.  
  23. ...
  24.  
  25. #define getc(p)	(--(p)->cnt >= 0) \
  26. 	? (unsigned char ) *(p)->ptr++ L _fillbuf((x), p)
  27.  
  28. #define putc(x,p) (--(p)-> >= 0) \
  29. 	? *(p)->ptr++ = (x) : _flushbuf((x), p)
  30.  
  31. ...
  32.  
  33. int _fillbuf( FILE *fp )
  34. {
  35. 	int bufsize;
  36.  
  37. 	if((fp->flag & (_READ|_EOF|_ERR)) != _READ)	{
  38. 		bufsuze = (fp->flag & _UNBUF) ? i : BUFSIZ;
  39. 		if(fp->base == NULL)
  40. 			if((fp->base = (char *) malloc(bufsize) == NULL)
  41. 				return EOF;
  42. 	}
  43.  
  44. 	fp->ptr = fp->base;
  45. 	fp->ctr = read(fp->fd, fp->ptr, bufsiz);
  46. 	if(--fp->cnt < 0)	{
  47. 		if(fp ->cnt -- -1)
  48. 			fp->flag |= _EOF;
  49. 		else
  50. 			fp->flag |= _ERR;
  51. 		fp->cnt = 0;
  52. 		return EOF;
  53. 	}
  54. }
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https://ideone.com/AIkCA
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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