Ja zaista ne znam sta si ti gledao, ali evo izvoda iz stdio.h:
Code:
/*
* <sys/reent.h> defines __sFILE, _fpos_t.
* They must be defined there because struct _reent needs them (and we don't
* want reent.h to include this file.
*/
#include <sys/reent.h>
typedef _fpos_t fpos_t;
typedef struct __sFILE FILE;
A u sys/reent.h pise:
Code:
struct __sFILE {
unsigned char *_p; /* current position in (some) buffer */
int _r; /* read space left for getc() */
int _w; /* write space left for putc() */
short _flags; /* flags, below; this FILE is free if 0 */
short _file; /* fileno, if Unix descriptor, else -1 */
struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
int _lbfsize; /* 0 or -_bf._size, for inline putc */
/* operations */
_PTR _cookie; /* cookie passed to io functions */
_READ_WRITE_RETURN_TYPE _EXFUN((*_read),(_PTR _cookie, char *_buf, int _n));
_READ_WRITE_RETURN_TYPE _EXFUN((*_write),(_PTR _cookie, const char *_buf,
int _n));
_fpos_t _EXFUN((*_seek),(_PTR _cookie, _fpos_t _offset, int _whence));
int _EXFUN((*_close),(_PTR _cookie));
/* separate buffer for long sequences of ungetc() */
struct __sbuf _ub; /* ungetc buffer */
unsigned char *_up; /* saved _p when _p is doing ungetc data */
int _ur; /* saved _r when _r is counting ungetc data */
/* tricks to meet minimum requirements even when malloc() fails */
unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
unsigned char _nbuf[1]; /* guarantee a getc() buffer */
/* separate buffer for fgetline() when line crosses buffer boundary */
struct __sbuf _lb; /* buffer for fgetline() */
/* Unix stdio files get aligned to block boundaries on fseek() */
int _blksize; /* stat.st_blksize (may be != _bf._size) */
int _offset; /* current lseek offset */
struct _reent *_data;
};
Kratko objasnjenje zasto je ovo u reent.h ce da usledi u mom sledecem tekstitju, jer ce biti predugacak za ovde...
Ocekujem da se Ivan (Dimkovic) javi i da zajedno eventualno napisemo neki opsirniji tekst, jer sam 101% siguran da se o tome malo pisalo i u nasim kompjutersnim casopisima a i u kompjuterskim knjigama...
(Dakle, posle ovoga citajte moj sledeti tekst.)
Dejan Lekic
software engineer, MySQL/PgSQL DBA, sysadmin
buffers & FILE
