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- /* $Header: /u/christos/src/tcsh-6.03/RCS/sh.hist.c,v 3.6 1992/10/05 02:41:30 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 3.6 1992/10/05 02:41:30 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
-
- /*
- * C shell
- */
-
- 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;
- {
- extern time_t Htime;
- register struct Hist *np = (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));
-
- 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;
- }
- np->Hnext = Histlist.Hnext;
- Histlist.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;
-
- if (getn(value(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;
- default:
- stderror(ERR_HISTUS, "chrSL");
- 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) {
- loadhist(*vp);
- return;
- }
- else if (hflg & HIST_SAVE) {
- rechist(*vp);
- return;
- }
- if (*vp)
- n = getn(*vp);
- else {
- n = getn(value(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) {
- Char *cp = str2short("%h\t%T\t%R\n");
- Char buf[BUFSIZE];
- struct varent *vp = adrof(STRhistory);
-
- if (vp && vp->vec[0] && vp->vec[1])
- cp = vp->vec[1];
-
- tprintf(FMT_HISTORY, buf, cp, BUFSIZE, NULL, hp->Htime, (ptr_t) hp);
- for (cp = buf; *cp;)
- xputchar(*cp++);
- }
- else {
- /*
- * 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);
- }
- }
-
-
- void
- fmthist(fmt, ptr, buf)
- int fmt;
- ptr_t ptr;
- char *buf;
- {
- struct Hist *hp = (struct Hist *) ptr;
- switch (fmt) {
- case 'h':
- xsprintf(buf, "%6d", hp->Hnum);
- break;
- case 'R':
- if (HistLit && hp->histline)
- xsprintf(buf, "%S", hp->histline);
- else {
- Char ibuf[BUFSIZE], *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)
- Char *fname;
- {
- Char buf[BUFSIZE], hbuf[BUFSIZE];
- int fp, ftmp, oldidfds;
- extern int fast;
- struct varent *shist;
- static Char *dumphist[] = {STRhistory, STRmh, 0, 0};
-
- if (!fast) {
- /*
- * If $savehist is just set, we use the value of $history
- * else we use the value in $savehist
- */
- if ((shist = adrof(STRsavehist)) != NULL) {
- if (shist->vec[0][0] != '\0')
- (void) Strcpy(hbuf, shist->vec[0]);
- else if ((shist = adrof(STRhistory)) != 0 &&
- shist->vec[0][0] != '\0')
- (void) Strcpy(hbuf, shist->vec[0]);
- else
- return;
- }
- else
- return;
-
- if (fname == NULL)
- if ((fname = value(STRhistfile)) == STRNULL) {
- fname = Strcpy(buf, value(STRhome));
- (void) Strcat(buf, &STRtildothist[1]);
- }
-
- fp = creat(short2str(fname), 0600);
- if (fp == -1)
- return;
- oldidfds = didfds;
- didfds = 0;
- ftmp = SHOUT;
- SHOUT = fp;
- dumphist[2] = hbuf;
- dohist(dumphist, NULL);
- (void) close(fp);
- SHOUT = ftmp;
- didfds = oldidfds;
- }
- }
-
-
- void
- loadhist(fname)
- Char *fname;
- {
- static Char *loadhist_cmd[] = {STRsource, STRmh, NULL, NULL};
-
- if (fname != NULL)
- loadhist_cmd[2] = fname;
- else if ((fname = value(STRhistfile)) != STRNULL)
- loadhist_cmd[2] = fname;
- else
- loadhist_cmd[2] = STRtildothist;
-
- dosource(loadhist_cmd, NULL);
- }
-