BSD 4 release

[unix-history] / usr / src / cmd / csh / sh.hist.c

static  char *sccsid = "@(#)sh.hist.c 4.1 10/9/80";

#include "sh.h"

/*
* C shell
*/

savehist(sp)
       struct wordent *sp;
{
       register struct Hist *hp, *np;
       int histlen;
       register char *cp;

       cp = value("history");
       if (*cp == 0)
               histlen = 0;
       else {
               while (*cp && digit(*cp))
                       cp++;
               /* avoid a looping snafu */
               if (*cp)
                       set("history", "10");
               histlen = getn(value("history"));
       }
       /* throw away null lines */
       if (sp->next->word[0] == '\n')
               return;
       for (hp = &Histlist; np = hp->Hnext;)
               if (eventno - np->Href >= histlen || histlen == 0)
                       hp->Hnext = np->Hnext, hfree(np);
               else
                       hp = np;
       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 *) calloc(1, sizeof *np);
       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);
}

hfree(hp)
       register struct Hist *hp;
{

       freelex(&hp->Hlex);
       xfree((char *)hp);
}

dohist(vp)
       char **vp;
{
       int n, rflg = 0;

       if (getn(value("history")) == 0)
               return;
       if (setintr)
               sigrelse(SIGINT);
       vp++;
       if (*vp && eq(*vp, "-r")) {
               rflg++;
               vp++;
       }
       if (*vp)
               n = getn(*vp);
       else
               n = 1000;
       dohist1(Histlist.Hnext, &n, rflg);
}

dohist1(hp, np, rflg)
       struct Hist *hp;
       int *np;
{
       bool print = (*np) > 0;
top:
       if (hp == 0)
               return;
       (*np)--;
       hp->Href++;
       if (rflg == 0) {
               dohist1(hp->Hnext, np, rflg);
               if (print)
                       phist(hp);
               return;
       }
       if (*np >= 0)
               phist(hp);
       hp = hp->Hnext;
       goto top;
}

phist(hp)
       register struct Hist *hp;
{

       printf("%6d\t", hp->Hnum);
       prlex(&hp->Hlex);
}