1 /* $NetBSD: hist.c,v 1.12 2001/09/14 14:04:00 wiz 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 5/31/93"; 40 #else 41 __RCSID("$NetBSD: hist.c,v 1.12 2001/09/14 14:04:00 wiz Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 47 #include <stdlib.h> 48 49 #if __STDC__ 50 # include <stdarg.h> 51 #else 52 # include <varargs.h> 53 #endif 54 55 #include "csh.h" 56 #include "extern.h" 57 58 static void hfree(struct Hist *); 59 static void dohist1(struct Hist *, int *, int, int); 60 static void phist(struct Hist *, int); 61 62 void 63 savehist(struct wordent *sp) 64 { 65 struct Hist *hp, *np; 66 Char *cp; 67 int histlen; 68 69 histlen = 0; 70 71 /* throw away null lines */ 72 if (sp->next->word[0] == '\n') 73 return; 74 cp = value(STRhistory); 75 if (*cp) { 76 Char *p = cp; 77 78 while (*p) { 79 if (!Isdigit(*p)) { 80 histlen = 0; 81 break; 82 } 83 histlen = histlen * 10 + *p++ - '0'; 84 } 85 } 86 for (hp = &Histlist; (np = hp->Hnext) != NULL;) 87 if (eventno - np->Href >= histlen || histlen == 0) 88 hp->Hnext = np->Hnext, hfree(np); 89 else 90 hp = np; 91 (void) enthist(++eventno, sp, 1); 92 } 93 94 struct Hist * 95 enthist(int event, struct wordent *lp, bool docopy) 96 { 97 struct Hist *np; 98 99 np = (struct Hist *)xmalloc((size_t)sizeof(*np)); 100 np->Hnum = np->Href = event; 101 if (docopy) { 102 copylex(&np->Hlex, lp); 103 } 104 else { 105 np->Hlex.next = lp->next; 106 lp->next->prev = &np->Hlex; 107 np->Hlex.prev = lp->prev; 108 lp->prev->next = &np->Hlex; 109 } 110 np->Hnext = Histlist.Hnext; 111 Histlist.Hnext = np; 112 return (np); 113 } 114 115 static void 116 hfree(struct Hist *hp) 117 { 118 freelex(&hp->Hlex); 119 xfree((ptr_t) hp); 120 } 121 122 void 123 /*ARGSUSED*/ 124 dohist(Char **v, struct command *t) 125 { 126 sigset_t sigset; 127 int hflg, n, rflg; 128 129 hflg = 0; 130 rflg = 0; 131 132 if (getn(value(STRhistory)) == 0) 133 return; 134 if (setintr) { 135 sigemptyset(&sigset); 136 (void)sigaddset(&sigset, SIGINT); 137 (void)sigprocmask(SIG_UNBLOCK, &sigset, NULL); 138 } 139 while (*++v && **v == '-') { 140 Char *vp = *v; 141 142 while (*++vp) 143 switch (*vp) { 144 case 'h': 145 hflg++; 146 break; 147 case 'r': 148 rflg++; 149 break; 150 case '-': /* ignore multiple '-'s */ 151 break; 152 default: 153 stderror(ERR_HISTUS); 154 /* NOTREACHED */ 155 } 156 } 157 if (*v) 158 n = getn(*v); 159 else { 160 n = getn(value(STRhistory)); 161 } 162 dohist1(Histlist.Hnext, &n, rflg, hflg); 163 } 164 165 static void 166 dohist1(struct Hist *hp, int *np, int rflg, int hflg) 167 { 168 bool print; 169 170 print = (*np) > 0; 171 172 for (; hp != 0; hp = hp->Hnext) { 173 (*np)--; 174 hp->Href++; 175 if (rflg == 0) { 176 dohist1(hp->Hnext, np, rflg, hflg); 177 if (print) 178 phist(hp, hflg); 179 return; 180 } 181 if (*np >= 0) 182 phist(hp, hflg); 183 } 184 } 185 186 static void 187 phist(struct Hist *hp, int hflg) 188 { 189 if (hflg == 0) 190 (void)fprintf(cshout, "%6d\t", hp->Hnum); 191 prlex(cshout, &hp->Hlex); 192 } 193