128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* flushbuf.c - flush a buffer
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*/
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/* $Id$ */
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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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#include <sys/types.h>
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off_t _lseek(int fildes, off_t offset, int whence);
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ssize_t _write(int d, const char *buf, int nbytes);
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int _isatty(int d);
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extern void (*_clean)(void);
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static int
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do_write(int d, char *buf, int nbytes)
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{
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int c;
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/* POSIX actually allows write() to return a positive value less
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than nbytes, so loop ...
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*/
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while ((c = _write(d, buf, nbytes)) > 0 && c < nbytes) {
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nbytes -= c;
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buf += c;
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}
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return c > 0;
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}
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int
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__flushbuf(int c, FILE * stream)
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{
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_clean = __cleanup;
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if (fileno(stream) < 0) return (unsigned char) c;
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if (!io_testflag(stream, _IOWRITE)) return EOF;
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if (io_testflag(stream, _IOREADING) && !feof(stream)) return EOF;
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stream->_flags &= ~_IOREADING;
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stream->_flags |= _IOWRITING;
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if (!io_testflag(stream, _IONBF)) {
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if (!stream->_buf) {
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if (stream == stdout && _isatty(fileno(stdout))) {
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if (!(stream->_buf =
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(unsigned char *) malloc(BUFSIZ))) {
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stream->_flags |= _IONBF;
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} else {
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stream->_flags |= _IOLBF|_IOMYBUF;
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stream->_bufsiz = BUFSIZ;
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stream->_count = -1;
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}
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} else {
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if (!(stream->_buf =
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(unsigned char *) malloc(BUFSIZ))) {
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stream->_flags |= _IONBF;
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} else {
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stream->_flags |= _IOMYBUF;
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stream->_bufsiz = BUFSIZ;
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if (!io_testflag(stream, _IOLBF))
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stream->_count = BUFSIZ - 1;
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else stream->_count = -1;
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}
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}
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stream->_ptr = stream->_buf;
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}
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}
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if (io_testflag(stream, _IONBF)) {
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char c1 = c;
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stream->_count = 0;
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if (io_testflag(stream, _IOAPPEND)) {
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if (_lseek(fileno(stream), 0L, SEEK_END) == -1) {
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stream->_flags |= _IOERR;
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return EOF;
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}
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}
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if (_write(fileno(stream), &c1, 1) != 1) {
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stream->_flags |= _IOERR;
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return EOF;
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}
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return (unsigned char) c;
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} else if (io_testflag(stream, _IOLBF)) {
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*stream->_ptr++ = c;
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/* stream->_count has been updated in putc macro. */
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if (c == '\n' || stream->_count == -stream->_bufsiz) {
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int count = -stream->_count;
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stream->_ptr = stream->_buf;
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stream->_count = 0;
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if (io_testflag(stream, _IOAPPEND)) {
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if (_lseek(fileno(stream), 0L, SEEK_END) == -1) {
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stream->_flags |= _IOERR;
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return EOF;
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}
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}
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if (! do_write(fileno(stream), (char *)stream->_buf,
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count)) {
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stream->_flags |= _IOERR;
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return EOF;
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}
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}
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} else {
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int count = stream->_ptr - stream->_buf;
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stream->_count = stream->_bufsiz - 1;
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stream->_ptr = stream->_buf + 1;
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if (count > 0) {
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if (io_testflag(stream, _IOAPPEND)) {
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if (_lseek(fileno(stream), 0L, SEEK_END) == -1) {
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stream->_flags |= _IOERR;
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return EOF;
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}
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}
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if (! do_write(fileno(stream), (char *)stream->_buf, count)) {
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*(stream->_buf) = c;
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stream->_flags |= _IOERR;
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return EOF;
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}
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}
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*(stream->_buf) = c;
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}
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return (unsigned char) c;
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}
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