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+/* $Header: /p/tcsh/cvsroot/tcsh/sh.hist.c,v 3.40 2007/03/01 17:14:51 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. 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("$tcsh: sh.hist.c,v 3.40 2007/03/01 17:14:51 christos Exp $")
+
+#include "tc.h"
+
+extern int histvalid;
+extern struct Strbuf histline;
+Char HistLit = 0;
+
+static int heq (const struct wordent *, const struct wordent *);
+static void hfree (struct Hist *);
+static void dohist1 (struct Hist *, int *, int);
+static void phist (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
+#define HIST_TIME 0x40
+
+/*
+ * C shell
+ */
+
+void
+savehist(struct wordent *sp, int mflg)
+{
+ struct Hist *hp, *np;
+ int histlen = 0;
+ Char *cp;
+
+ /* throw away null lines */
+ if (sp && sp->next->word[0] == '\n')
+ return;
+ cp = varval(STRhistory);
+ while (*cp) {
+ if (!Isdigit(*cp)) {
+ histlen = 0;
+ break;
+ }
+ histlen = histlen * 10 + *cp++ - '0';
+ }
+ if (sp)
+ (void) enthist(++eventno, sp, 1, mflg);
+ for (hp = &Histlist; (np = hp->Hnext) != NULL;)
+ if (eventno - np->Href >= histlen || histlen == 0)
+ hp->Hnext = np->Hnext, hfree(np);
+ else
+ hp = np;
+}
+
+static int
+heq(const struct wordent *a0, const struct wordent *b0)
+{
+ const struct wordent *a = a0->next, *b = b0->next;
+
+ for (;;) {
+ if (Strcmp(a->word, b->word) != 0)
+ return 0;
+ a = a->next;
+ b = b->next;
+ if (a == a0)
+ return (b == b0) ? 1 : 0;
+ if (b == b0)
+ return 0;
+ }
+}
+
+
+struct Hist *
+enthist(int event, struct wordent *lp, int docopy, int mflg)
+{
+ struct Hist *p = NULL, *pp = &Histlist;
+ int n, r;
+ struct Hist *np;
+ const 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;
+ if (Htime != 0 && p->Htime > Htime)
+ Htime = p->Htime;
+ n = p->Href;
+ hfree(p);
+ for (p = px->Hnext; p != NULL; p = p->Hnext)
+ p->Href = n--;
+ break;
+ }
+ }
+ else if (eq(dp, STRall)) {
+ for (p = pp; (p = p->Hnext) != NULL;)
+ if (heq(lp, &(p->Hlex))) {
+ eventno--;
+ break;
+ }
+ }
+ else if (eq(dp, STRprev)) {
+ if (pp->Hnext && heq(lp, &(pp->Hnext->Hlex))) {
+ p = pp->Hnext;
+ eventno--;
+ }
+ }
+ }
+
+ np = p ? p : xmalloc(sizeof(*np));
+
+ /* Pick up timestamp set by lex() in Htime if reading saved history */
+ if (Htime != 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.s);
+ 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(struct Hist *hp)
+{
+
+ freelex(&hp->Hlex);
+ if (hp->histline)
+ xfree(hp->histline);
+ xfree(hp);
+}
+
+
+/*ARGSUSED*/
+void
+dohist(Char **vp, struct command *c)
+{
+ int n, hflg = 0;
+
+ USE(c);
+ if (getn(varval(STRhistory)) == 0)
+ return;
+ 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;
+ case 'T':
+ hflg |= HIST_TIME;
+ break;
+ default:
+ stderror(ERR_HISTUS, "chrSLMT");
+ 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);
+ else if (hflg & HIST_SAVE)
+ rechist(*vp, 1);
+ else {
+ if (*vp)
+ n = getn(*vp);
+ else {
+ n = getn(varval(STRhistory));
+ }
+ dohist1(Histlist.Hnext, &n, hflg);
+ }
+}
+
+static void
+dohist1(struct Hist *hp, int *np, int hflg)
+{
+ int print = (*np) > 0;
+
+ for (; hp != 0; hp = hp->Hnext) {
+ if (setintr) {
+ int old_pintr_disabled;
+
+ pintr_push_enable(&old_pintr_disabled);
+ cleanup_until(&old_pintr_disabled);
+ }
+ (*np)--;
+ 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(struct Hist *hp, int hflg)
+{
+ if (hflg & HIST_ONLY) {
+ int old_output_raw;
+
+ /*
+ * Control characters have to be written as is (output_raw).
+ * This way one can preserve special characters (like tab) in
+ * the history file.
+ * From: mveksler@vnet.ibm.com (Veksler Michael)
+ */
+ old_output_raw = output_raw;
+ output_raw = 1;
+ cleanup_push(&old_output_raw, output_raw_restore);
+ if (hflg & HIST_TIME)
+ /*
+ * Make file entry with history time in format:
+ * "+NNNNNNNNNN" (10 digits, left padded with ascii '0')
+ */
+
+ xprintf("#+%010lu\n", (unsigned long)hp->Htime);
+
+ if (HistLit && hp->histline)
+ xprintf("%S\n", hp->histline);
+ else
+ prlex(&hp->Hlex);
+ cleanup_until(&old_output_raw);
+ }
+ else {
+ Char *cp = str2short("%h\t%T\t%R\n");
+ Char *p;
+ struct varent *vp = adrof(STRhistory);
+
+ if (vp && vp->vec != NULL && vp->vec[0] && vp->vec[1])
+ cp = vp->vec[1];
+
+ p = tprintf(FMT_HISTORY, cp, NULL, hp->Htime, hp);
+ cleanup_push(p, xfree);
+ for (cp = p; *cp;)
+ xputwchar(*cp++);
+ cleanup_until(p);
+ }
+}
+
+
+char *
+fmthist(int fmt, ptr_t ptr)
+{
+ struct Hist *hp = ptr;
+ char *buf;
+
+ switch (fmt) {
+ case 'h':
+ return xasprintf("%6d", hp->Hnum);
+ case 'R':
+ if (HistLit && hp->histline)
+ return xasprintf("%S", hp->histline);
+ else {
+ Char *istr, *ip;
+ char *p;
+
+ istr = sprlex(&hp->Hlex);
+ buf = xmalloc(Strlen(istr) * MB_LEN_MAX + 1);
+
+ for (p = buf, ip = istr; *ip != '\0'; ip++)
+ p += one_wctomb(p, CHAR & *ip);
+
+ *p = '\0';
+ xfree(istr);
+ return buf;
+ }
+ default:
+ buf = xmalloc(1);
+ buf[0] = '\0';
+ return buf;
+ }
+}
+
+void
+rechist(Char *fname, int ref)
+{
+ Char *snum;
+ int fp, ftmp, oldidfds;
+ struct varent *shist;
+ static Char *dumphist[] = {STRhistory, STRmhT, 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);
+ cleanup_push(fname, xfree);
+
+ /*
+ * The 'savehist merge' feature is intended for an environment
+ * with numerous shells being 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 && shist->vec != NULL)
+ if (shist->vec[1] && eq(shist->vec[1], STRmerge))
+ loadhist(fname, 1);
+ fp = xcreat(short2str(fname), 0600);
+ if (fp == -1) {
+ didfds = oldidfds;
+ cleanup_until(fname);
+ return;
+ }
+ ftmp = SHOUT;
+ SHOUT = fp;
+ dumphist[2] = snum;
+ dohist(dumphist, NULL);
+ xclose(fp);
+ SHOUT = ftmp;
+ didfds = oldidfds;
+ cleanup_until(fname);
+}
+
+
+void
+loadhist(Char *fname, int 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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