e964872f18
* The last character is not displayed. * If the alias ends with itself (as a word), an infinite memory-eating loop occurs. If an alias is defined initially, a space is appended to avoid recursion but this did not happen when an alias was later modified. PR: bin/173418 Submitted by: Daniel F. MFC after: 1 week
293 lines
6.7 KiB
C
293 lines
6.7 KiB
C
/*-
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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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* 4. 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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#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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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdlib.h>
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#include "shell.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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#define ATABSIZE 39
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static struct alias *atab[ATABSIZE];
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static int aliases;
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static void setalias(const char *, const char *);
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static int unalias(const char *);
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static struct alias **hashalias(const char *);
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static
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void
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setalias(const char *name, const char *val)
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{
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struct alias *ap, **app;
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app = hashalias(name);
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for (ap = *app; ap; ap = ap->next) {
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if (equal(name, ap->name)) {
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INTOFF;
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ckfree(ap->val);
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/* See HACK below. */
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#ifdef notyet
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ap->val = savestr(val);
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#else
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{
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size_t len = strlen(val);
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ap->val = ckmalloc(len + 2);
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memcpy(ap->val, val, len);
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ap->val[len] = ' ';
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ap->val[len+1] = '\0';
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}
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#endif
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INTON;
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return;
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}
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}
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/* not found */
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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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/*
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* XXX - HACK: in order that the parser will not finish reading the
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* alias value off the input before processing the next alias, we
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* dummy up an extra space at the end of the alias. This is a crock
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* and should be re-thought. The idea (if you feel inclined to help)
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* is to avoid alias recursions. The mechanism used is: when
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* expanding an alias, the value of the alias is pushed back on the
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* input as a string and a pointer to the alias is stored with the
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* string. The alias is marked as being in use. When the input
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* routine finishes reading the string, it marks the alias not
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* in use. The problem is synchronization with the parser. Since
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* it reads ahead, the alias is marked not in use before the
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* resulting token(s) is next checked for further alias sub. The
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* H A C K is that we add a little fluff after the alias value
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* so that the string will not be exhausted. This is a good
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* idea ------- ***NOT***
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*/
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#ifdef notyet
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ap->val = savestr(val);
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#else /* hack */
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{
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size_t len = strlen(val);
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ap->val = ckmalloc(len + 2);
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memcpy(ap->val, val, len);
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ap->val[len] = ' '; /* fluff */
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ap->val[len+1] = '\0';
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}
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#endif
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ap->flag = 0;
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ap->next = *app;
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*app = ap;
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aliases++;
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INTON;
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}
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static int
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unalias(const 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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for (ap = *app; ap; app = &(ap->next), ap = ap->next) {
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if (equal(name, ap->name)) {
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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 freeing it.
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* We could clear it out later, but this situation
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* is so rare that it hardly seems worth it.
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*/
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if (ap->flag & ALIASINUSE)
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*ap->name = '\0';
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else {
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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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}
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aliases--;
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return (0);
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}
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}
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return (1);
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}
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static void
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rmaliases(void)
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{
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struct alias *ap, *tmp;
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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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ap = atab[i];
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atab[i] = NULL;
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while (ap) {
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ckfree(ap->name);
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ckfree(ap->val);
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tmp = ap;
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ap = ap->next;
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ckfree(tmp);
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}
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}
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aliases = 0;
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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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for (; ap; ap = ap->next) {
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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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}
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return (NULL);
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}
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static int
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comparealiases(const void *p1, const void *p2)
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{
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const struct alias *const *a1 = p1;
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const struct alias *const *a2 = p2;
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return strcmp((*a1)->name, (*a2)->name);
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}
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static void
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printalias(const struct alias *a)
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{
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char *p;
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out1fmt("%s=", a->name);
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/* Don't print the space added above. */
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p = a->val + strlen(a->val) - 1;
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*p = '\0';
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out1qstr(a->val);
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*p = ' ';
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out1c('\n');
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}
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static void
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printaliases(void)
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{
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int i, j;
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struct alias **sorted, *ap;
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sorted = ckmalloc(aliases * sizeof(*sorted));
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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; ap = ap->next)
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if (*ap->name != '\0')
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sorted[j++] = ap;
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qsort(sorted, aliases, sizeof(*sorted), comparealiases);
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for (i = 0; i < aliases; i++)
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printalias(sorted[i]);
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ckfree(sorted);
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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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printaliases();
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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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warning("%s: not found", n);
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ret = 1;
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} else
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printalias(ap);
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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 __unused, char **argv __unused)
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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();
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return (0);
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}
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}
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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 = *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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