bin/csh/hist.c

   1 /* $NetBSD: hist.c,v 1.20 2013/07/16 17:47:43 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1980, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)hist.c      8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: hist.c,v 1.20 2013/07/16 17:47:43 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <stdarg.h>
  44 #include <stdlib.h>
  45
  46 #include "csh.h"
  47 #include "extern.h"
  48
  49 static void hfree(struct Hist *);
  50 static void dohist1(struct Hist *, int *, int, int);
  51 static void phist(struct Hist *, int);
  52
  53 void
  54 savehist(struct wordent *sp)
  55 {
  56     struct Hist *hp, *np;
  57     Char *cp;
  58     int histlen;
  59
  60     histlen = 0;
  61
  62     /* throw away null lines */
  63     if (sp->next->word[0] == '\n')
  64         return;
  65     cp = value(STRhistory);
  66     if (*cp) {
  67         Char *p = cp;
  68
  69         while (*p) {
  70             if (!Isdigit(*p)) {
  71                 histlen = 0;
  72                 break;
  73             }
  74             histlen = histlen * 10 + *p++ - '0';
  75         }
  76     }
  77     for (hp = &Histlist; (np = hp->Hnext) != NULL;)
  78         if (eventno - np->Href >= histlen || histlen == 0)
  79             hp->Hnext = np->Hnext, hfree(np);
  80         else
  81             hp = np;
  82     (void) enthist(++eventno, sp, 1);
  83 }
  84
  85 #ifdef EDIT
  86 void
  87 loadhist(struct Hist *hp) {
  88     char *h = NULL;
  89
  90     if (hi == NULL || hp == NULL)
  91         return;
  92     loadhist(hp->Hnext);
  93     if (sprlex(&h, &hp->Hlex) != -1) {
  94         HistEvent ev;
  95         history(hi, &ev, H_ENTER, h);
  96     }
  97 }
  98 #endif
  99
 100 struct Hist *
 101 enthist(int event, struct wordent *lp, int docopy)
 102 {
 103     struct Hist *np;
 104
 105 #ifdef EDIT
 106     if (hi) {
 107         char *h = NULL;
 108         if (sprlex(&h, lp) != -1) {
 109             HistEvent ev;
 110             history(hi, &ev, H_ENTER, h);
 111         }
 112     }
 113 #endif
 114     np = xmalloc(sizeof(*np));
 115     np->Hnum = np->Href = event;
 116     if (docopy) {
 117         copylex(&np->Hlex, lp);
 118     }
 119     else {
 120         np->Hlex.next = lp->next;
 121         lp->next->prev = &np->Hlex;
 122         np->Hlex.prev = lp->prev;
 123         lp->prev->next = &np->Hlex;
 124     }
 125     np->Hnext = Histlist.Hnext;
 126     Histlist.Hnext = np;
 127     return (np);
 128 }
 129
 130 static void
 131 hfree(struct Hist *hp)
 132 {
 133     freelex(&hp->Hlex);
 134     xfree((ptr_t) hp);
 135 }
 136
 137 void
 138 /*ARGSUSED*/
 139 dohist(Char **v, struct command *t)
 140 {
 141     sigset_t nsigset;
 142     int hflg, n, rflg;
 143
 144     hflg = 0;
 145     rflg = 0;
 146
 147     if (getn(value(STRhistory)) == 0)
 148         return;
 149     if (setintr) {
 150         sigemptyset(&nsigset);
 151         (void)sigaddset(&nsigset, SIGINT);
 152         (void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
 153     }
 154     while (*++v && **v == '-') {
 155         Char *vp = *v;
 156
 157         while (*++vp)
 158             switch (*vp) {
 159             case 'h':
 160                 hflg++;
 161                 break;
 162             case 'r':
 163                 rflg++;
 164                 break;
 165             case '-':           /* ignore multiple '-'s */
 166                 break;
 167             default:
 168                 stderror(ERR_HISTUS);
 169                 /* NOTREACHED */
 170             }
 171     }
 172     if (*v)
 173         n = getn(*v);
 174     else {
 175         n = getn(value(STRhistory));
 176     }
 177     dohist1(Histlist.Hnext, &n, rflg, hflg);
 178 }
 179
 180 static void
 181 dohist1(struct Hist *hp, int *np, int rflg, int hflg)
 182 {
 183     int print;
 184
 185     print = (*np) > 0;
 186
 187     for (; hp != 0; hp = hp->Hnext) {
 188         (*np)--;
 189         hp->Href++;
 190         if (rflg == 0) {
 191             dohist1(hp->Hnext, np, rflg, hflg);
 192             if (print)
 193                 phist(hp, hflg);
 194             return;
 195         }
 196         if (*np >= 0)
 197             phist(hp, hflg);
 198     }
 199 }
 200
 201 static void
 202 phist(struct Hist *hp, int hflg)
 203 {
 204     if (hflg == 0)
 205         (void)fprintf(cshout, "%6d\t", hp->Hnum);
 206     prlex(cshout, &hp->Hlex);
 207 }