NetBSD/bin/csh/hist.c

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/* $NetBSD: hist.c,v 1.15 2003/08/07 09:05:06 agc Exp $ */
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/*-
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* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
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#if 0
static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: hist.c,v 1.15 2003/08/07 09:05:06 agc Exp $");
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#endif
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#endif /* not lint */
#include <sys/types.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include "csh.h"
#include "extern.h"
static void hfree(struct Hist *);
static void dohist1(struct Hist *, int *, int, int);
static void phist(struct Hist *, int);
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void
savehist(struct wordent *sp)
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{
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struct Hist *hp, *np;
Char *cp;
int histlen;
histlen = 0;
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/* throw away null lines */
if (sp->next->word[0] == '\n')
return;
cp = value(STRhistory);
if (*cp) {
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Char *p = cp;
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while (*p) {
if (!Isdigit(*p)) {
histlen = 0;
break;
}
histlen = histlen * 10 + *p++ - '0';
}
}
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for (hp = &Histlist; (np = hp->Hnext) != NULL;)
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if (eventno - np->Href >= histlen || histlen == 0)
hp->Hnext = np->Hnext, hfree(np);
else
hp = np;
(void) enthist(++eventno, sp, 1);
}
struct Hist *
enthist(int event, struct wordent *lp, bool docopy)
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{
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struct Hist *np;
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np = (struct Hist *)xmalloc((size_t)sizeof(*np));
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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(struct Hist *hp)
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{
freelex(&hp->Hlex);
xfree((ptr_t) hp);
}
void
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/*ARGSUSED*/
dohist(Char **v, struct command *t)
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{
sigset_t nsigset;
int hflg, n, rflg;
hflg = 0;
rflg = 0;
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if (getn(value(STRhistory)) == 0)
return;
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if (setintr) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
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}
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while (*++v && **v == '-') {
Char *vp = *v;
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while (*++vp)
switch (*vp) {
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case 'h':
hflg++;
break;
case 'r':
rflg++;
break;
case '-': /* ignore multiple '-'s */
break;
default:
stderror(ERR_HISTUS);
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/* NOTREACHED */
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}
}
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if (*v)
n = getn(*v);
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else {
n = getn(value(STRhistory));
}
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dohist1(Histlist.Hnext, &n, rflg, hflg);
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}
static void
dohist1(struct Hist *hp, int *np, int rflg, int hflg)
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{
bool print;
print = (*np) > 0;
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for (; hp != 0; hp = hp->Hnext) {
(*np)--;
hp->Href++;
if (rflg == 0) {
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dohist1(hp->Hnext, np, rflg, hflg);
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if (print)
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phist(hp, hflg);
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return;
}
if (*np >= 0)
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phist(hp, hflg);
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}
}
static void
phist(struct Hist *hp, int hflg)
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{
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if (hflg == 0)
(void)fprintf(cshout, "%6d\t", hp->Hnum);
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prlex(cshout, &hp->Hlex);
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}