Home | History | Annotate | Line # | Download | only in csh
hist.c revision 1.15 
      1 /* $NetBSD: hist.c,v 1.15 2003/08/07 09:05:06 agc 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 1.15 2003/08/07 09:05:06 agc 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, bool 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     bool 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 }
    184