freebsd-dev/bin/sh/alias.c

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/*-
* 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. 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
* 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.
*/
#ifndef lint
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#if 0
static char sccsid[] = "@(#)alias.c 8.3 (Berkeley) 5/4/95";
#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <stdlib.h>
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#include "shell.h"
#include "output.h"
#include "error.h"
#include "memalloc.h"
#include "mystring.h"
#include "alias.h"
#include "options.h"
#include "builtins.h"
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#define ATABSIZE 39
static struct alias *atab[ATABSIZE];
static int aliases;
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static void setalias(const char *, const char *);
static int unalias(const char *);
static struct alias **hashalias(const char *);
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static
void
setalias(const char *name, const char *val)
{
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struct alias *ap, **app;
unalias(name);
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app = hashalias(name);
INTOFF;
ap = ckmalloc(sizeof (struct alias));
ap->name = savestr(name);
ap->val = savestr(val);
ap->flag = 0;
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ap->next = *app;
*app = ap;
aliases++;
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INTON;
}
static void
freealias(struct alias *ap)
{
ckfree(ap->name);
ckfree(ap->val);
ckfree(ap);
}
static int
unalias(const char *name)
{
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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;
freealias(ap);
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INTON;
}
aliases--;
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return (0);
}
}
return (1);
}
static void
rmaliases(void)
{
struct alias *ap, **app;
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int i;
INTOFF;
for (i = 0; i < ATABSIZE; i++) {
app = &atab[i];
while (*app) {
ap = *app;
if (ap->flag & ALIASINUSE) {
*ap->name = '\0';
app = &(*app)->next;
} else {
*app = ap->next;
freealias(ap);
}
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}
}
aliases = 0;
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INTON;
}
struct alias *
lookupalias(const char *name, int check)
{
struct alias *ap;
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if (aliases == 0)
return (NULL);
for (ap = *hashalias(name); ap; ap = ap->next) {
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if (equal(name, ap->name)) {
if (check && (ap->flag & ALIASINUSE))
return (NULL);
return (ap);
}
}
return (NULL);
}
static int
comparealiases(const void *p1, const void *p2)
{
const struct alias *const *a1 = p1;
const struct alias *const *a2 = p2;
return strcmp((*a1)->name, (*a2)->name);
}
static void
printalias(const struct alias *a)
{
out1fmt("%s=", a->name);
out1qstr(a->val);
out1c('\n');
}
static void
printaliases(void)
{
int i, j;
struct alias **sorted, *ap;
INTOFF;
sorted = ckmalloc(aliases * sizeof(*sorted));
j = 0;
for (i = 0; i < ATABSIZE; i++)
for (ap = atab[i]; ap; ap = ap->next)
if (*ap->name != '\0')
sorted[j++] = ap;
qsort(sorted, aliases, sizeof(*sorted), comparealiases);
for (i = 0; i < aliases; i++) {
printalias(sorted[i]);
if (int_pending())
break;
}
ckfree(sorted);
INTON;
}
int
aliascmd(int argc __unused, char **argv __unused)
{
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char *n, *v;
int ret = 0;
struct alias *ap;
nextopt("");
if (*argptr == NULL) {
printaliases();
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return (0);
}
while ((n = *argptr++) != NULL) {
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if ((v = strchr(n+1, '=')) == NULL) /* n+1: funny ksh stuff */
if ((ap = lookupalias(n, 0)) == NULL) {
warning("%s: not found", n);
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ret = 1;
} else
printalias(ap);
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else {
*v++ = '\0';
setalias(n, v);
}
}
return (ret);
}
int
unaliascmd(int argc __unused, char **argv __unused)
{
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int i;
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while ((i = nextopt("a")) != '\0') {
if (i == 'a') {
rmaliases();
return (0);
}
}
for (i = 0; *argptr; argptr++)
i |= unalias(*argptr);
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return (i);
}
static struct alias **
hashalias(const char *p)
{
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unsigned int hashval;
hashval = (unsigned char)*p << 4;
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while (*p)
hashval+= *p++;
return &atab[hashval % ATABSIZE];
}