usr/src/bin/csh/hist.c

/*-
 * Copyright (c) 1980, 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)hist.c      5.5 (Berkeley) %G%";
#endif /* not lint */

#include "sh.h"

static void hfree();
static void dohist1();
static void phist();

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;)
        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;
{
    register struct Hist *np;

    np = (struct Hist *) xmalloc((size_t) sizeof(*np));
    (void) time(&(np->Htime));
    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(hp)
    register struct Hist *hp;
{

    freelex(&hp->Hlex);
    xfree((ptr_t) hp);
}

void
dohist(vp)
    Char  **vp;
{
    int     n, rflg = 0, hflg = 0, tflg = 0;

    if (getn(value(STRhistory)) == 0)
        return;
    if (setintr)
        (void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT));
    while (*++vp && **vp == '-') {
        Char   *vp2 = *vp;

        while (*++vp2)
            switch (*vp2) {
            case 'h':
                hflg++;
                break;
            case 'r':
                rflg++;
                break;
            case 't':
                tflg++;
                break;
            case '-':           /* ignore multiple '-'s */
                break;
            default:
                stderror(ERR_HISTUS);
                break;
            }
    }
    if (*vp)
        n = getn(*vp);
    else {
        n = getn(value(STRhistory));
    }
    dohist1(Histlist.Hnext, &n, rflg, hflg, tflg);
}

static void
dohist1(hp, np, rflg, hflg, tflg)
    struct Hist *hp;
    int    *np, rflg, hflg, tflg;
{
    bool    print = (*np) > 0;

    for (; hp != 0; hp = hp->Hnext) {
        (*np)--;
        hp->Href++;
        if (rflg == 0) {
            dohist1(hp->Hnext, np, rflg, hflg, tflg);
            if (print)
                phist(hp, hflg, tflg);
            return;
        }
        if (*np >= 0)
            phist(hp, hflg, tflg);
    }
}

static void
phist(hp, hflg, tflg)
    register struct Hist *hp;
    int     hflg, tflg;
{
    struct tm *t;
    char    ampm = 'a';

    if (hflg == 0) {
        xprintf("%6d\t", hp->Hnum);
        if (tflg == 0) {
            t = localtime(&hp->Htime);
            if (adrof(STRampm)) {       /* addition by Hans J. Albertsson */
                if (t->tm_hour >= 12) {
                    if (t->tm_hour > 12)
                        t->tm_hour -= 12;
                    ampm = 'p';
                }
                else if (t->tm_hour == 0)
                    t->tm_hour = 12;
                xprintf("%2d:%02d%cm\t", t->tm_hour, t->tm_min, ampm);
            }
            else {
                xprintf("%2d:%02d\t", t->tm_hour, t->tm_min);
            }
        }
    }
    prlex(&hp->Hlex);
}