cmd/mailx/vars.c

	vars.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/*
 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * 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"
#include <locale.h>

/*
 * mailx -- a modified version of a University of California at Berkeley
 *  mail program
 *
 * Variable handling stuff.
 */

static struct var   *lookup(char name[]);

/*
 * Assign a value to a variable.
 */
void
assign(char name[], char value[])
{
    register struct var *vp;
    register int h;

    if (name[0]=='-')
        deassign(name+1);
    else if (name[0]=='n' && name[1]=='o')
        deassign(name+2);
    else {
        h = hash(name);
        vp = lookup(name);
        if (vp == NOVAR) {
            if ((vp = (struct var *)
                calloc(sizeof (*vp), 1)) == NULL)
                panic("Out of memory");
            vp->v_name = vcopy(name);
            vp->v_link = variables[h];
            variables[h] = vp;
        } else
            vfree(vp->v_value);
        vp->v_value = vcopy(value);
        /*
         * for efficiency, intercept certain assignments here
         */
        if (strcmp(name, "prompt")==0)
            prompt = vp->v_value;
        else if (strcmp(name, "debug")==0)
            debug = 1;
        if (debug) fprintf(stderr, "assign(%s)=%s\n", vp->v_name, vp->v_value);
    }
}

int
deassign(register char *s)
{
    register struct var *vp, *vp2;
    register int h;

    if ((vp2 = lookup(s)) == NOVAR) {
        if (!sourcing) {
            printf(gettext("\"%s\": undefined variable\n"), s);
            return(1);
        }
        return(0);
    }
    if (debug) fprintf(stderr, "deassign(%s)\n", s);
    if (strcmp(s, "prompt")==0)
        prompt = NOSTR;
    else if (strcmp(s, "debug")==0)
        debug = 0;
    h = hash(s);
    if (vp2 == variables[h]) {
        variables[h] = variables[h]->v_link;
        vfree(vp2->v_name);
        vfree(vp2->v_value);
        free(vp2);
        return(0);
    }
    for (vp = variables[h]; vp->v_link != vp2; vp = vp->v_link)
        ;
    vp->v_link = vp2->v_link;
    vfree(vp2->v_name);
    vfree(vp2->v_value);
    free(vp2);
    return(0);
}

/*
 * Free up a variable string.  We do not bother to allocate
 * strings whose value is "" since they are expected to be frequent.
 * Thus, we cannot free same!
 */
void
vfree(register char *cp)
{
    if (!equal(cp, ""))
        free(cp);
}

/*
 * Copy a variable value into permanent (ie, not collected after each
 * command) space.  Do not bother to alloc space for ""
 */

char *
vcopy(char str[])
{
    register char *top, *cp, *cp2;

    if (equal(str, ""))
        return("");
    if ((top = (char *)calloc(strlen(str)+1, 1)) == NULL)
        panic("Out of memory");
    cp = top;
    cp2 = str;
    while (*cp++ = *cp2++)
        ;
    return(top);
}

/*
 * Get the value of a variable and return it.
 * Look in the environment if its not available locally.
 */

char *
value(char name[])
{
    register struct var *vp;
    register char *cp;

    if ((vp = lookup(name)) == NOVAR)
        cp = getenv(name);
    else
        cp = vp->v_value;
    if (debug) fprintf(stderr, "value(%s)=%s\n", name, (cp)?cp:"");
    return(cp);
}

/*
 * Locate a variable and return its variable
 * node.
 */

static struct var *
lookup(char name[])
{
    register struct var *vp;
    register int h;

    h = hash(name);
    for (vp = variables[h]; vp != NOVAR; vp = vp->v_link)
        if (equal(vp->v_name, name))
            return(vp);
    return(NOVAR);
}

/*
 * Locate a group name and return it.
 */

struct grouphead *
findgroup(char name[])
{
    register struct grouphead *gh;
    register int h;

    h = hash(name);
    for (gh = groups[h]; gh != NOGRP; gh = gh->g_link)
        if (equal(gh->g_name, name))
            return(gh);
    return(NOGRP);
}

/*
 * Print a group out on stdout
 */
void
printgroup(char name[])
{
    register struct grouphead *gh;
    register struct mgroup *gp;

    if ((gh = findgroup(name)) == NOGRP) {
        printf(gettext("\"%s\": not a group\n"), name);
        return;
    }
    printf("%s\t", gh->g_name);
    for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link)
        printf(" %s", gp->ge_name);
    printf("\n");
}

/*
 * Hash the passed string and return an index into
 * the variable or group hash table.
 */

int
hash(char name[])
{
    register unsigned h;
    register char *cp;

    for (cp = name, h = 0; *cp; h = (h << 2) + *cp++)
        ;
    return(h % HSHSIZE);
}