cmd/mailx/myfopen.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1994 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "rcv.h"

#undef  fopen
#undef  fclose

/*
 * mailx -- a modified version of a University of California at Berkeley
 *  mail program
 *
 * Local version of fopen() and fclose(). These maintain a list of
 * file pointers which can be run down when we need to close
 * all files, such as before executing external commands.
 */

static NODE *append();
static NODE *del1();
static NODE *getnode();
static NODE *search();

static NODE *
getnode(FILE *fp)
{
    NODE *newnode;

    if ((newnode = (NODE *)malloc(sizeof(NODE))) == (NODE *)NULL) {
        (void) fputs("Cannot allocate node space\n", stderr);
        exit(3);
    }
    newnode->fp = fp;
    newnode->next = (NODE *)NULL;
    return(newnode);
}

static NODE *
search(FILE *fp)
{
    register NODE *tmp;

    for (tmp = fplist; tmp != (NODE *)NULL; tmp = tmp->next)
        if (tmp->fp == fp)
            break;
    return( tmp != (NODE *)NULL ? tmp : NOFP);
}

static NODE *
append(FILE *fp)
{
    register NODE *newnode;

    if ((newnode = getnode(fp)) == (NODE *)NULL)
        return(NOFP);
    if (fplist == NOFP) {
        fplist = newnode;
    } else {
        newnode->next = curptr->next;
        curptr->next = newnode;
    }
    return(newnode);
}

static NODE *
del1(NODE *oldcur)
{
    register NODE *cur, *prev;

    for (prev = cur = fplist; cur != (NODE *)NULL; cur = cur->next) {
        if (cur == oldcur) {
            if (cur == fplist) {
                cur = fplist = cur->next;
            } else {
                prev->next = cur->next;
                cur = prev->next ? prev->next : prev;
            }
            if (curptr == oldcur)
                curptr = prev;
            free(oldcur);
            break;
        }
        prev = cur;
    }
    return(cur);
}

FILE *
my_fopen(char *file, char *mode)
{
    FILE *fp;

    if ((fp = fopen(file, mode)) == (FILE *)NULL) {
        fplist = NOFP;
        return(fp);
    } else {
        curptr = append(fp);
    }
    return(fp);
}

int
my_fclose(register FILE *iop)
{
    register NODE *cur;

    int ret = fclose(iop);
    if (fplist != NOFP) {
        cur = search(iop);
        cur = del1(cur);
    }
    return ret;
}