performance

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

#ifndef lint
static  char *sccsid = "@(#)hist.c      4.9 (Berkeley) %G%";
#endif

#include "sh.h"

/*
* C shell
*/

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("history");
       if (*cp) {
               register char *p = cp;

               while (*p) {
                       if (!digit(*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 *) xalloc(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, hflg = 0;
       if (getn(value("history")) == 0)
               return;
       if (setintr)
               (void) sigsetmask(sigblock(0) & ~sigmask(SIGINT));
       vp++;
       while (*vp && *vp[0] == '-') {
               if (*vp && eq(*vp, "-h"))
                       hflg++;
               else if (*vp && eq(*vp, "-r"))
                       rflg++;
               vp++;
       }
       if (*vp)
               n = getn(*vp);
       else {
               n = getn(value("history"));
       }
       dohist1(Histlist.Hnext, &n, rflg, hflg);
}

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

phist(hp, hflg)
       register struct Hist *hp;
       int hflg;
{

       if (hflg == 0)
               printf("%6d\t", hp->Hnum);
       prlex(&hp->Hlex);
}