254 lines
6.0 KiB
C
254 lines
6.0 KiB
C
/*-
|
|
* Copyright (c) 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Id: alias.c,v 1.2 1994/09/24 02:57:20 davidg Exp $
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)alias.c 8.1 (Berkeley) 5/31/93";
|
|
#endif /* not lint */
|
|
|
|
#include "shell.h"
|
|
#include "input.h"
|
|
#include "output.h"
|
|
#include "error.h"
|
|
#include "memalloc.h"
|
|
#include "mystring.h"
|
|
#include "alias.h"
|
|
#include "options.h" /* XXX for argptr (should remove?) */
|
|
|
|
#define ATABSIZE 39
|
|
|
|
struct alias *atab[ATABSIZE];
|
|
|
|
STATIC struct alias **hashalias __P((char *));
|
|
|
|
STATIC
|
|
setalias(name, val)
|
|
char *name, *val;
|
|
{
|
|
struct alias *ap, **app;
|
|
|
|
app = hashalias(name);
|
|
for (ap = *app; ap; ap = ap->next) {
|
|
if (equal(name, ap->name)) {
|
|
INTOFF;
|
|
ckfree(ap->val);
|
|
ap->val = savestr(val);
|
|
INTON;
|
|
return;
|
|
}
|
|
}
|
|
/* not found */
|
|
INTOFF;
|
|
ap = ckmalloc(sizeof (struct alias));
|
|
ap->name = savestr(name);
|
|
/*
|
|
* XXX - HACK: in order that the parser will not finish reading the
|
|
* alias value off the input before processing the next alias, we
|
|
* dummy up an extra space at the end of the alias. This is a crock
|
|
* and should be re-thought. The idea (if you feel inclined to help)
|
|
* is to avoid alias recursions. The mechanism used is: when
|
|
* expanding an alias, the value of the alias is pushed back on the
|
|
* input as a string and a pointer to the alias is stored with the
|
|
* string. The alias is marked as being in use. When the input
|
|
* routine finishes reading the string, it markes the alias not
|
|
* in use. The problem is synchronization with the parser. Since
|
|
* it reads ahead, the alias is marked not in use before the
|
|
* resulting token(s) is next checked for further alias sub. The
|
|
* H A C K is that we add a little fluff after the alias value
|
|
* so that the string will not be exhausted. This is a good
|
|
* idea ------- ***NOT***
|
|
*/
|
|
#ifdef notyet
|
|
ap->val = savestr(val);
|
|
#else /* hack */
|
|
{
|
|
int len = strlen(val);
|
|
ap->val = ckmalloc(len + 2);
|
|
bcopy(val, ap->val, len);
|
|
ap->val[len] = ' '; /* fluff */
|
|
ap->val[len+1] = '\0';
|
|
}
|
|
#endif
|
|
ap->next = *app;
|
|
*app = ap;
|
|
INTON;
|
|
}
|
|
|
|
STATIC int
|
|
unalias(name)
|
|
char *name;
|
|
{
|
|
struct alias *ap, **app;
|
|
|
|
app = hashalias(name);
|
|
|
|
for (ap = *app; ap; app = &(ap->next), ap = ap->next) {
|
|
if (equal(name, ap->name)) {
|
|
/*
|
|
* if the alias is currently in use (i.e. its
|
|
* buffer is being used by the input routine) we
|
|
* just null out the name instead of freeing it.
|
|
* We could clear it out later, but this situation
|
|
* is so rare that it hardly seems worth it.
|
|
*/
|
|
if (ap->flag & ALIASINUSE)
|
|
*ap->name = '\0';
|
|
else {
|
|
INTOFF;
|
|
*app = ap->next;
|
|
ckfree(ap->name);
|
|
ckfree(ap->val);
|
|
ckfree(ap);
|
|
INTON;
|
|
}
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
#ifdef mkinit
|
|
MKINIT void rmaliases();
|
|
|
|
SHELLPROC {
|
|
rmaliases();
|
|
}
|
|
#endif
|
|
|
|
void
|
|
rmaliases() {
|
|
struct alias *ap, *tmp;
|
|
int i;
|
|
|
|
INTOFF;
|
|
for (i = 0; i < ATABSIZE; i++) {
|
|
ap = atab[i];
|
|
atab[i] = NULL;
|
|
while (ap) {
|
|
ckfree(ap->name);
|
|
ckfree(ap->val);
|
|
tmp = ap;
|
|
ap = ap->next;
|
|
ckfree(tmp);
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
struct alias *
|
|
lookupalias(name, check)
|
|
char *name;
|
|
{
|
|
struct alias *ap = *hashalias(name);
|
|
|
|
for (; ap; ap = ap->next) {
|
|
if (equal(name, ap->name)) {
|
|
if (check && (ap->flag & ALIASINUSE))
|
|
return (NULL);
|
|
return (ap);
|
|
}
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* TODO - sort output
|
|
*/
|
|
aliascmd(argc, argv)
|
|
char **argv;
|
|
{
|
|
char *n, *v;
|
|
int ret = 0;
|
|
struct alias *ap;
|
|
|
|
if (argc == 1) {
|
|
int i;
|
|
|
|
for (i = 0; i < ATABSIZE; i++)
|
|
for (ap = atab[i]; ap; ap = ap->next) {
|
|
if (*ap->name != '\0')
|
|
out1fmt("alias %s=%s\n", ap->name, ap->val);
|
|
}
|
|
return (0);
|
|
}
|
|
while (n = *++argv) {
|
|
if ((v = strchr(n+1, '=')) == NULL) /* n+1: funny ksh stuff */
|
|
if ((ap = lookupalias(n, 0)) == NULL) {
|
|
outfmt(out2, "alias: %s not found\n", n);
|
|
ret = 1;
|
|
} else
|
|
out1fmt("alias %s=%s\n", n, ap->val);
|
|
else {
|
|
*v++ = '\0';
|
|
setalias(n, v);
|
|
}
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
unaliascmd(argc, argv)
|
|
char **argv;
|
|
{
|
|
int i;
|
|
|
|
while ((i = nextopt("a")) != '\0') {
|
|
if (i == 'a') {
|
|
rmaliases();
|
|
return (0);
|
|
}
|
|
}
|
|
for (i = 0; *argptr; argptr++)
|
|
i = unalias(*argptr);
|
|
|
|
return (i);
|
|
}
|
|
|
|
STATIC struct alias **
|
|
hashalias(p)
|
|
register char *p;
|
|
{
|
|
unsigned int hashval;
|
|
|
|
hashval = *p << 4;
|
|
while (*p)
|
|
hashval+= *p++;
|
|
return &atab[hashval % ATABSIZE];
|
|
}
|