bin/csh/hist.c

   1 /* $NetBSD: hist.c,v 1.17 2007/07/16 14:07:01 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 1.17 2007/07/16 14:07:01 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 struct Hist *
  86 enthist(int event, struct wordent *lp, int docopy)
  87 {
  88     struct Hist *np;
  89
  90     np = (struct Hist *)xmalloc((size_t)sizeof(*np));
  91     np->Hnum = np->Href = event;
  92     if (docopy) {
  93         copylex(&np->Hlex, lp);
  94     }
  95     else {
  96         np->Hlex.next = lp->next;
  97         lp->next->prev = &np->Hlex;
  98         np->Hlex.prev = lp->prev;
  99         lp->prev->next = &np->Hlex;
 100     }
 101     np->Hnext = Histlist.Hnext;
 102     Histlist.Hnext = np;
 103     return (np);
 104 }
 105
 106 static void
 107 hfree(struct Hist *hp)
 108 {
 109     freelex(&hp->Hlex);
 110     xfree((ptr_t) hp);
 111 }
 112
 113 void
 114 /*ARGSUSED*/
 115 dohist(Char **v, struct command *t)
 116 {
 117     sigset_t nsigset;
 118     int hflg, n, rflg;
 119
 120     hflg = 0;
 121     rflg = 0;
 122
 123     if (getn(value(STRhistory)) == 0)
 124         return;
 125     if (setintr) {
 126         sigemptyset(&nsigset);
 127         (void)sigaddset(&nsigset, SIGINT);
 128         (void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
 129     }
 130     while (*++v && **v == '-') {
 131         Char *vp = *v;
 132
 133         while (*++vp)
 134             switch (*vp) {
 135             case 'h':
 136                 hflg++;
 137                 break;
 138             case 'r':
 139                 rflg++;
 140                 break;
 141             case '-':           /* ignore multiple '-'s */
 142                 break;
 143             default:
 144                 stderror(ERR_HISTUS);
 145                 /* NOTREACHED */
 146             }
 147     }
 148     if (*v)
 149         n = getn(*v);
 150     else {
 151         n = getn(value(STRhistory));
 152     }
 153     dohist1(Histlist.Hnext, &n, rflg, hflg);
 154 }
 155
 156 static void
 157 dohist1(struct Hist *hp, int *np, int rflg, int hflg)
 158 {
 159     int print;
 160
 161     print = (*np) > 0;
 162
 163     for (; hp != 0; hp = hp->Hnext) {
 164         (*np)--;
 165         hp->Href++;
 166         if (rflg == 0) {
 167             dohist1(hp->Hnext, np, rflg, hflg);
 168             if (print)
 169                 phist(hp, hflg);
 170             return;
 171         }
 172         if (*np >= 0)
 173             phist(hp, hflg);
 174     }
 175 }
 176
 177 static void
 178 phist(struct Hist *hp, int hflg)
 179 {
 180     if (hflg == 0)
 181         (void)fprintf(cshout, "%6d\t", hp->Hnum);
 182     prlex(cshout, &hp->Hlex);
 183 }