70 lines
1.5 KiB
C
Executable File
70 lines
1.5 KiB
C
Executable File
/*
|
|
* fillbuf.c - fill a buffer
|
|
*/
|
|
/* $Header$ */
|
|
|
|
#if defined(_POSIX_SOURCE)
|
|
#include <sys/types.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "loc_incl.h"
|
|
|
|
ssize_t _read(ssize_t d, char *buf, size_t nbytes);
|
|
|
|
int
|
|
__fillbuf(register FILE *stream)
|
|
{
|
|
static unsigned char ch[FOPEN_MAX];
|
|
register int i;
|
|
|
|
stream->_count = 0;
|
|
if (fileno(stream) < 0) return EOF;
|
|
if (io_testflag(stream, (_IOEOF | _IOERR ))) return EOF;
|
|
if (!io_testflag(stream, _IOREAD))
|
|
{ stream->_flags |= _IOERR; return EOF; }
|
|
if (io_testflag(stream, _IOWRITING))
|
|
{ stream->_flags |= _IOERR; return EOF; }
|
|
|
|
if (!io_testflag(stream, _IOREADING))
|
|
stream->_flags |= _IOREADING;
|
|
|
|
if (!io_testflag(stream, _IONBF) && !stream->_buf) {
|
|
stream->_buf = (unsigned char *) malloc(BUFSIZ);
|
|
if (!stream->_buf) {
|
|
stream->_flags |= _IONBF;
|
|
}
|
|
else {
|
|
stream->_flags |= _IOMYBUF;
|
|
stream->_bufsiz = BUFSIZ;
|
|
}
|
|
}
|
|
|
|
/* flush line-buffered output when filling an input buffer */
|
|
for (i = 0; i < FOPEN_MAX; i++) {
|
|
if (__iotab[i] && io_testflag(__iotab[i], _IOLBF))
|
|
if (io_testflag(__iotab[i], _IOWRITING))
|
|
(void) fflush(__iotab[i]);
|
|
}
|
|
|
|
if (!stream->_buf) {
|
|
stream->_buf = &ch[fileno(stream)];
|
|
stream->_bufsiz = 1;
|
|
}
|
|
stream->_ptr = stream->_buf;
|
|
stream->_count = _read(stream->_fd, (char *)stream->_buf, stream->_bufsiz);
|
|
|
|
if (stream->_count <= 0){
|
|
if (stream->_count == 0) {
|
|
stream->_flags |= _IOEOF;
|
|
}
|
|
else
|
|
stream->_flags |= _IOERR;
|
|
|
|
return EOF;
|
|
}
|
|
stream->_count--;
|
|
|
|
return *stream->_ptr++;
|
|
}
|