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/* @(#)flag.c 2.4 97/05/29 Copyright 1986 J. Schilling */
/*
* Copyright (c) 1986 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include "io.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern char *malloc();
extern char *realloc();
#endif
#ifdef DO_MYFLAG
#define FL_INIT 10
int _io_glflag; /* global default flag */
int _fl_inc = 10; /* increment for expanding flag struct */
int _fl_max = FL_INIT; /* max fd currently in _io_myfl */
_io_fl _io_smyfl[FL_INIT]; /* initial static space */
_io_fl *_io_myfl = _io_smyfl; /* init to static space */
LOCAL int _more_flags __PR((FILE * ));
LOCAL int _more_flags(fp)
FILE *fp;
{
register int f = fileno(fp);
register int n = _fl_max;
register _io_fl *np;
while (n <= f)
n += _fl_inc;
if (_io_myfl == _io_smyfl) {
np = (_io_fl *) malloc(n * sizeof(*np));
fillbytes(np, n * sizeof(*np), '\0');
movebytes(_io_smyfl, np, sizeof(_io_smyfl)/sizeof(*np));
} else {
np = (_io_fl *) realloc(_io_myfl, n * sizeof(*np));
if (np)
fillbytes(&np[_fl_max], (n-_fl_max)*sizeof(*np), '\0');
}
if (np) {
_io_myfl = np;
_fl_max = n;
return (_io_get_my_flag(fp));
} else {
return (_IONORAISE);
}
}
int _io_get_my_flag(fp)
register FILE *fp;
{
register int f = fileno(fp);
register _io_fl *fl;
if (f >= _fl_max)
return (_more_flags(fp));
fl = &_io_myfl[f];
if (fl->fl_io == 0 || fl->fl_io == fp)
return (fl->fl_flags);
while (fl && fl->fl_io != fp)
fl = fl->fl_next;
if (fl == 0)
return (0);
return (fl->fl_flags);
}
void _io_set_my_flag(fp, flag)
FILE *fp;
int flag;
{
register int f = fileno(fp);
register _io_fl *fl;
register _io_fl *fl2;
if (f >= _fl_max)
(void) _more_flags(fp);
fl = &_io_myfl[f];
if (fl->fl_io != (FILE *)0) {
fl2 = fl;
while (fl && fl->fl_io != fp)
fl = fl->fl_next;
if (fl == 0) {
if ((fl = (_io_fl *) malloc(sizeof(*fl))) == 0)
return;
fl->fl_next = fl2->fl_next;
fl2->fl_next = fl;
}
}
fl->fl_io = fp;
fl->fl_flags = flag;
}
void _io_add_my_flag(fp, flag)
FILE *fp;
int flag;
{
int oflag = _io_get_my_flag(fp);
oflag |= flag;
_io_set_my_flag(fp, oflag);
}
#endif /* DO_MYFLAG */
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