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