315 lines
6.4 KiB
C
315 lines
6.4 KiB
C
/* $NetBSD: alias.c,v 1.21 2019/02/09 09:11:07 kre Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)alias.c 8.3 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: alias.c,v 1.21 2019/02/09 09:11:07 kre Exp $");
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#endif
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#endif /* not lint */
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#include <stdlib.h>
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#include "shell.h"
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#include "input.h"
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#include "output.h"
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#include "error.h"
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#include "memalloc.h"
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#include "mystring.h"
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#include "alias.h"
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#include "options.h" /* XXX for argptr (should remove?) */
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#include "builtins.h"
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#include "var.h"
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#define ATABSIZE 39
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struct alias *atab[ATABSIZE];
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STATIC void setalias(char *, char *);
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STATIC int by_name(const void *, const void *);
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STATIC void list_aliases(void);
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STATIC int unalias(char *);
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STATIC struct alias **freealias(struct alias **, int);
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STATIC struct alias **hashalias(const char *);
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STATIC int countaliases(void);
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STATIC
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void
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setalias(char *name, char *val)
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{
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struct alias *ap, **app;
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(void) unalias(name); /* old one (if any) is now gone */
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app = hashalias(name);
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INTOFF;
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ap = ckmalloc(sizeof (struct alias));
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ap->name = savestr(name);
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ap->flag = 0;
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ap->val = savestr(val);
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ap->next = *app;
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*app = ap;
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INTON;
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}
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STATIC struct alias **
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freealias(struct alias **app, int force)
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{
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struct alias *ap = *app;
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if (ap == NULL)
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return app;
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/*
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* if the alias is currently in use (i.e. its
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* buffer is being used by the input routine) we
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* just null out the name instead of discarding it.
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* If we encounter it later, when it is idle,
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* we will finish freeing it then.
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*
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* Unless we want to simply free everything (INIT)
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*/
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if (ap->flag & ALIASINUSE && !force) {
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*ap->name = '\0';
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return &ap->next;
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}
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INTOFF;
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*app = ap->next;
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ckfree(ap->name);
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ckfree(ap->val);
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ckfree(ap);
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INTON;
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return app;
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}
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STATIC int
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unalias(char *name)
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{
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struct alias *ap, **app;
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app = hashalias(name);
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while ((ap = *app) != NULL) {
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if (equal(name, ap->name)) {
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(void) freealias(app, 0);
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return 0;
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}
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app = &ap->next;
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}
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return 1;
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}
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#ifdef mkinit
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MKINIT void rmaliases(int);
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SHELLPROC {
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rmaliases(1);
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}
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#endif
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void
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rmaliases(int force)
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{
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struct alias **app;
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int i;
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INTOFF;
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for (i = 0; i < ATABSIZE; i++) {
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app = &atab[i];
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while (*app)
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app = freealias(app, force);
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}
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INTON;
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}
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struct alias *
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lookupalias(const char *name, int check)
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{
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struct alias *ap = *hashalias(name);
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while (ap != NULL) {
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if (equal(name, ap->name)) {
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if (check && (ap->flag & ALIASINUSE))
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return NULL;
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return ap;
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}
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ap = ap->next;
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}
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return NULL;
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}
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const char *
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alias_text(void *dummy __unused, const char *name)
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{
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struct alias *ap;
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ap = lookupalias(name, 0);
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if (ap == NULL)
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return NULL;
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return ap->val;
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}
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STATIC int
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by_name(const void *a, const void *b)
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{
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return strcmp(
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(*(const struct alias * const *)a)->name,
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(*(const struct alias * const *)b)->name);
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}
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STATIC void
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list_aliases(void)
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{
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int i, j, n;
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const struct alias **aliases;
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const struct alias *ap;
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INTOFF;
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n = countaliases();
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aliases = stalloc(n * (int)(sizeof aliases[0]));
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j = 0;
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for (i = 0; i < ATABSIZE; i++)
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for (ap = atab[i]; ap != NULL; ap = ap->next)
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if (ap->name[0] != '\0')
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aliases[j++] = ap;
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if (j != n)
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error("Alias count botch");
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INTON;
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qsort(aliases, n, sizeof aliases[0], by_name);
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for (i = 0; i < n; i++) {
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out1fmt("alias %s=", aliases[i]->name);
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print_quoted(aliases[i]->val);
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out1c('\n');
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}
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stunalloc(aliases);
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}
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/*
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* Count how many aliases are defined (skipping any
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* that have been deleted, but don't know it yet).
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* Use this opportunity to clean up any of those
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* zombies that are no longer needed.
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*/
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STATIC int
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countaliases(void)
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{
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struct alias *ap, **app;
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size_t n;
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int i;
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n = 0;
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for (i = 0; i < ATABSIZE; i++)
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for (app = &atab[i]; (ap = *app) != NULL;) {
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if (ap->name[0] != '\0')
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n++;
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else {
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app = freealias(app, 0);
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continue;
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}
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app = &ap->next;
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}
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return n;
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}
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int
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aliascmd(int argc, char **argv)
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{
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char *n, *v;
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int ret = 0;
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struct alias *ap;
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if (argc == 1) {
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list_aliases();
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return 0;
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}
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while ((n = *++argv) != NULL) {
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if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
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if ((ap = lookupalias(n, 0)) == NULL) {
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outfmt(out2, "alias: %s not found\n", n);
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ret = 1;
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} else {
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out1fmt("alias %s=", n);
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print_quoted(ap->val);
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out1c('\n');
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}
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} else {
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*v++ = '\0';
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setalias(n, v);
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}
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}
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return ret;
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}
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int
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unaliascmd(int argc, char **argv)
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{
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int i;
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while ((i = nextopt("a")) != '\0') {
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if (i == 'a') {
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rmaliases(0);
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return 0;
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}
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}
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(void)countaliases(); /* delete any dead ones */
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for (i = 0; *argptr; argptr++)
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i |= unalias(*argptr);
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return i;
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}
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STATIC struct alias **
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hashalias(const char *p)
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{
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unsigned int hashval;
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hashval = *(const unsigned char *)p << 4;
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while (*p)
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hashval += *p++;
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return &atab[hashval % ATABSIZE];
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}
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