freebsd-skq/bin/csh/hist.c

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1994-05-26 06:18:55 +00:00
/*-
* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
1994-09-24 02:59:15 +00:00
*
* $Id$
1994-05-26 06:18:55 +00:00
*/
#ifndef lint
static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <sys/types.h>
#include <stdlib.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "csh.h"
#include "extern.h"
static void hfree __P((struct Hist *));
static void dohist1 __P((struct Hist *, int *, int, int));
static void phist __P((struct Hist *, int));
void
savehist(sp)
struct wordent *sp;
{
register struct Hist *hp, *np;
register int histlen = 0;
Char *cp;
/* throw away null lines */
if (sp->next->word[0] == '\n')
return;
cp = value(STRhistory);
if (*cp) {
register Char *p = cp;
while (*p) {
if (!Isdigit(*p)) {
histlen = 0;
break;
}
histlen = histlen * 10 + *p++ - '0';
}
}
for (hp = &Histlist; (np = hp->Hnext) != NULL;)
if (eventno - np->Href >= histlen || histlen == 0)
hp->Hnext = np->Hnext, hfree(np);
else
hp = np;
(void) enthist(++eventno, sp, 1);
}
struct Hist *
enthist(event, lp, docopy)
int event;
register struct wordent *lp;
bool docopy;
{
register struct Hist *np;
np = (struct Hist *) xmalloc((size_t) sizeof(*np));
np->Hnum = np->Href = event;
if (docopy) {
copylex(&np->Hlex, lp);
}
else {
np->Hlex.next = lp->next;
lp->next->prev = &np->Hlex;
np->Hlex.prev = lp->prev;
lp->prev->next = &np->Hlex;
}
np->Hnext = Histlist.Hnext;
Histlist.Hnext = np;
return (np);
}
static void
hfree(hp)
register struct Hist *hp;
{
freelex(&hp->Hlex);
xfree((ptr_t) hp);
}
void
/*ARGSUSED*/
dohist(v, t)
Char **v;
struct command *t;
{
int n, rflg = 0, hflg = 0;
if (getn(value(STRhistory)) == 0)
return;
if (setintr)
(void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT));
while (*++v && **v == '-') {
Char *vp = *v;
while (*++vp)
switch (*vp) {
case 'h':
hflg++;
break;
case 'r':
rflg++;
break;
case '-': /* ignore multiple '-'s */
break;
default:
stderror(ERR_HISTUS);
break;
}
}
if (*v)
n = getn(*v);
else {
n = getn(value(STRhistory));
}
dohist1(Histlist.Hnext, &n, rflg, hflg);
}
static void
dohist1(hp, np, rflg, hflg)
struct Hist *hp;
int *np, rflg, hflg;
{
bool print = (*np) > 0;
for (; hp != 0; hp = hp->Hnext) {
(*np)--;
hp->Href++;
if (rflg == 0) {
dohist1(hp->Hnext, np, rflg, hflg);
if (print)
phist(hp, hflg);
return;
}
if (*np >= 0)
phist(hp, hflg);
}
}
static void
phist(hp, hflg)
register struct Hist *hp;
int hflg;
{
if (hflg == 0)
(void) fprintf(cshout, "%6d\t", hp->Hnum);
prlex(cshout, &hp->Hlex);
}