1 /* $NetBSD: hist.c,v 1.7 1995/03/21 18:35:44 mycroft 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 5/31/93"; 39 #else 40 static char rcsid[] = "$NetBSD: hist.c,v 1.7 1995/03/21 18:35:44 mycroft Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <stdlib.h> 46 #if __STDC__ 47 # include <stdarg.h> 48 #else 49 # include <varargs.h> 50 #endif 51 52 #include "csh.h" 53 #include "extern.h" 54 55 static void hfree __P((struct Hist *)); 56 static void dohist1 __P((struct Hist *, int *, int, int)); 57 static void phist __P((struct Hist *, int)); 58 59 void 60 savehist(sp) 61 struct wordent *sp; 62 { 63 register struct Hist *hp, *np; 64 register int histlen = 0; 65 Char *cp; 66 67 /* throw away null lines */ 68 if (sp->next->word[0] == '\n') 69 return; 70 cp = value(STRhistory); 71 if (*cp) { 72 register Char *p = cp; 73 74 while (*p) { 75 if (!Isdigit(*p)) { 76 histlen = 0; 77 break; 78 } 79 histlen = histlen * 10 + *p++ - '0'; 80 } 81 } 82 for (hp = &Histlist; (np = hp->Hnext) != NULL;) 83 if (eventno - np->Href >= histlen || histlen == 0) 84 hp->Hnext = np->Hnext, hfree(np); 85 else 86 hp = np; 87 (void) enthist(++eventno, sp, 1); 88 } 89 90 struct Hist * 91 enthist(event, lp, docopy) 92 int event; 93 register struct wordent *lp; 94 bool docopy; 95 { 96 register struct Hist *np; 97 98 np = (struct Hist *) xmalloc((size_t) sizeof(*np)); 99 np->Hnum = np->Href = event; 100 if (docopy) { 101 copylex(&np->Hlex, lp); 102 } 103 else { 104 np->Hlex.next = lp->next; 105 lp->next->prev = &np->Hlex; 106 np->Hlex.prev = lp->prev; 107 lp->prev->next = &np->Hlex; 108 } 109 np->Hnext = Histlist.Hnext; 110 Histlist.Hnext = np; 111 return (np); 112 } 113 114 static void 115 hfree(hp) 116 register struct Hist *hp; 117 { 118 119 freelex(&hp->Hlex); 120 xfree((ptr_t) hp); 121 } 122 123 void 124 /*ARGSUSED*/ 125 dohist(v, t) 126 Char **v; 127 struct command *t; 128 { 129 int n, rflg = 0, hflg = 0; 130 sigset_t sigset; 131 132 if (getn(value(STRhistory)) == 0) 133 return; 134 if (setintr) { 135 sigemptyset(&sigset); 136 sigaddset(&sigset, SIGINT); 137 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 break; 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(hp, np, rflg, hflg) 167 struct Hist *hp; 168 int *np, rflg, hflg; 169 { 170 bool 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(hp, hflg) 188 register struct Hist *hp; 189 int hflg; 190 { 191 if (hflg == 0) 192 (void) fprintf(cshout, "%6d\t", hp->Hnum); 193 prlex(cshout, &hp->Hlex); 194 } 195