source: trunk/third/tcsh/sh.hist.c @ 9006

/* $Header: /afs/dev.mit.edu/source/repository/third/tcsh/sh.hist.c,v 1.1.1.1 1996-10-02 06:09:21 ghudson 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 1.1.1.1 1996-10-02 06:09:21 ghudson 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);
}