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/* $Header: /u/christos/src/tcsh-6.06/RCS/sh.hist.c,v 3.20 1994/07/08 14:43:50 christos Exp $ */
/*
* sh.hist.c: Shell history expansions and substitutions
*/
/*-
* Copyright (c) 1980, 1991 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.
*/
#include "sh.h"
RCSID("$Id: sh.hist.c,v 3.20 1994/07/08 14:43:50 christos Exp $")
#include "tc.h"
extern bool histvalid;
extern Char histline[];
Char HistLit = 0;
static void hfree __P((struct Hist *));
static void dohist1 __P((struct Hist *, int *, int));
static void phist __P((struct Hist *, int));
#define HIST_ONLY 0x01
#define HIST_SAVE 0x02
#define HIST_LOAD 0x04
#define HIST_REV 0x08
#define HIST_CLEAR 0x10
#define HIST_MERGE 0x20
/*
* C shell
*/
void
savehist(sp, mflg)
struct wordent *sp;
bool mflg;
{
register struct Hist *hp, *np;
register int histlen = 0;
Char *cp;
/* throw away null lines */
if (sp && sp->next->word[0] == '\n')
return;
cp = varval(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;
if (sp)
(void) enthist(++eventno, sp, 1, mflg);
}
static bool
heq(a0, b0)
struct wordent *a0, *b0;
{
register struct wordent *a = a0->next, *b = b0->next;
for (;;)
{
if (Strcmp(a->word, b->word))
return 0;
a = a->next; b = b->next;
if (a == a0)
return (b == b0) ? 1 : 0;
if (b == b0)
return 0;
}
}
struct Hist *
enthist(event, lp, docopy, mflg)
int event;
register struct wordent *lp;
bool docopy;
bool mflg;
{
extern time_t Htime;
struct Hist *p = NULL, *pp = &Histlist;
int n, r;
register struct Hist *np;
Char *dp;
if ((dp = varval(STRhistdup)) != STRNULL) {
if (eq(dp, STRerase)) {
/* masaoki@akebono.tky.hp.com (Kobayashi Masaoki) */
struct Hist *px;
for (p = pp; (px = p, p = p->Hnext) != NULL;)
if (heq(lp, &(p->Hlex))){
px->Hnext = p->Hnext;
hfree(p);
p = NULL;
break;
}
}
else if (eq(dp, STRall)) {
for (p = pp; (p = p->Hnext) != NULL;)
if (heq(lp, &(p->Hlex)))
break;
}
else if (eq(dp, STRprev)) {
if (pp->Hnext && heq(lp, &(pp->Hnext->Hlex)))
p = pp->Hnext;
}
}
np = p ? p : (struct Hist *) xmalloc((size_t) sizeof(*np));
/* Pick up timestamp set by lex() in Htime if reading saved history */
if (Htime != (time_t) 0) {
np->Htime = Htime;
Htime = 0;
}
else
(void) time(&(np->Htime));
if (p == np)
return np;
np->Hnum = np->Href = event;
if (docopy) {
copylex(&np->Hlex, lp);
if (histvalid)
np->histline = Strsave(histline);
else
np->histline = NULL;
}
else {
np->Hlex.next = lp->next;
lp->next->prev = &np->Hlex;
np->Hlex.prev = lp->prev;
lp->prev->next = &np->Hlex;
np->histline = NULL;
}
if (mflg)
{
while ((p = pp->Hnext) && (p->Htime > np->Htime))
pp = p;
while (p && p->Htime == np->Htime)
{
if (heq(&p->Hlex, &np->Hlex))
{
eventno--;
hfree(np);
return (p);
}
pp = p;
p = p->Hnext;
}
for (p = Histlist.Hnext; p != pp->Hnext; p = p->Hnext)
{
n = p->Hnum; r = p->Href;
p->Hnum = np->Hnum; p->Href = np->Href;
np->Hnum = n; np->Href = r;
}
}
np->Hnext = pp->Hnext;
pp->Hnext = np;
return (np);
}
static void
hfree(hp)
register struct Hist *hp;
{
freelex(&hp->Hlex);
if (hp->histline)
xfree((ptr_t) hp->histline);
xfree((ptr_t) hp);
}
/*ARGSUSED*/
void
dohist(vp, c)
Char **vp;
struct command *c;
{
int n, hflg = 0;
USE(c);
if (getn(varval(STRhistory)) == 0)
return;
if (setintr)
#ifdef BSDSIGS
(void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT));
#else
(void) sigrelse(SIGINT);
#endif
while (*++vp && **vp == '-') {
Char *vp2 = *vp;
while (*++vp2)
switch (*vp2) {
case 'c':
hflg |= HIST_CLEAR;
break;
case 'h':
hflg |= HIST_ONLY;
break;
case 'r':
hflg |= HIST_REV;
break;
case 'S':
hflg |= HIST_SAVE;
break;
case 'L':
hflg |= HIST_LOAD;
break;
case 'M':
hflg |= HIST_MERGE;
break;
default:
stderror(ERR_HISTUS, "chrSLM");
break;
}
}
if (hflg & HIST_CLEAR) {
struct Hist *np, *hp;
for (hp = &Histlist; (np = hp->Hnext) != NULL;)
hp->Hnext = np->Hnext, hfree(np);
}
if (hflg & (HIST_LOAD | HIST_MERGE)) {
loadhist(*vp, (hflg & HIST_MERGE) ? 1 : 0);
return;
}
else if (hflg & HIST_SAVE) {
rechist(*vp, 1);
return;
}
if (*vp)
n = getn(*vp);
else {
n = getn(varval(STRhistory));
}
dohist1(Histlist.Hnext, &n, hflg);
}
static void
dohist1(hp, np, hflg)
struct Hist *hp;
int *np, hflg;
{
bool print = (*np) > 0;
for (; hp != 0; hp = hp->Hnext) {
(*np)--;
hp->Href++;
if ((hflg & HIST_REV) == 0) {
dohist1(hp->Hnext, np, 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 & HIST_ONLY) {
/*
* Make file entry with history time in format:
* "+NNNNNNNNNN" (10 digits, left padded with ascii '0')
*/
xprintf("#+%010lu\n", hp->Htime);
if (HistLit && hp->histline)
xprintf("%S\n", hp->histline);
else
prlex(&hp->Hlex);
}
else {
Char *cp = str2short("%h\t%T\t%R\n");
Char buf[INBUFSIZE];
struct varent *vp = adrof(STRhistory);
if (vp && vp->vec[0] && vp->vec[1])
cp = vp->vec[1];
tprintf(FMT_HISTORY, buf, cp, INBUFSIZE, NULL, hp->Htime, (ptr_t) hp);
for (cp = buf; *cp;)
xputchar(*cp++);
}
}
void
fmthist(fmt, ptr, buf)
int fmt;
ptr_t ptr;
char *buf;
{
struct Hist *hp = (struct Hist *) ptr;
switch (fmt) {
case 'h':
(void) xsprintf(buf, "%6d", hp->Hnum);
break;
case 'R':
if (HistLit && hp->histline)
(void) xsprintf(buf, "%S", hp->histline);
else {
Char ibuf[INBUFSIZE], *ip;
char *p;
(void) sprlex(ibuf, &hp->Hlex);
for (p = buf, ip = ibuf; (*p++ = *ip++) != '\0'; )
continue;
}
break;
default:
buf[0] = '\0';
break;
}
}
void
rechist(fname, ref)
Char *fname;
int ref;
{
Char *snum;
int fp, ftmp, oldidfds;
struct varent *shist;
static Char *dumphist[] = {STRhistory, STRmh, 0, 0};
if (fname == NULL && !ref)
return;
/*
* If $savehist is just set, we use the value of $history
* else we use the value in $savehist
*/
if (((snum = varval(STRsavehist)) == STRNULL) &&
((snum = varval(STRhistory)) == STRNULL))
snum = STRmaxint;
if (fname == NULL) {
if ((fname = varval(STRhistfile)) == STRNULL)
fname = Strspl(varval(STRhome), &STRtildothist[1]);
else
fname = Strsave(fname);
}
else
fname = globone(fname, G_ERROR);
/*
* The 'savehist merge' feature is intended for an environment
* with numerous shells beeing in simultaneous use. Imagine
* any kind of window system. All these shells 'share' the same
* ~/.history file for recording their command line history.
* Currently the automatic merge can only succeed when the shells
* nicely quit one after another.
*
* Users that like to nuke their environment require here an atomic
* loadhist-creat-dohist(dumphist)-close
* sequence.
*
* jw.
*/
/*
* We need the didfds stuff before loadhist otherwise
* exec in a script will fail to print if merge is set.
* From: mveksler@iil.intel.com (Veksler Michael)
*/
oldidfds = didfds;
didfds = 0;
if ((shist = adrof(STRsavehist)) != NULL)
if (shist->vec[1] && eq(shist->vec[1], STRmerge))
loadhist(fname, 1);
fp = creat(short2str(fname), 0600);
if (fp == -1) {
didfds = oldidfds;
return;
}
ftmp = SHOUT;
SHOUT = fp;
dumphist[2] = snum;
dohist(dumphist, NULL);
(void) close(fp);
SHOUT = ftmp;
didfds = oldidfds;
xfree((ptr_t) fname);
}
void
loadhist(fname, mflg)
Char *fname;
bool mflg;
{
static Char *loadhist_cmd[] = {STRsource, NULL, NULL, NULL};
loadhist_cmd[1] = mflg ? STRmm : STRmh;
if (fname != NULL)
loadhist_cmd[2] = fname;
else if ((fname = varval(STRhistfile)) != STRNULL)
loadhist_cmd[2] = fname;
else
loadhist_cmd[2] = STRtildothist;
dosource(loadhist_cmd, NULL);
}
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