773 lines
13 KiB
C
773 lines
13 KiB
C
/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley Software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef lint
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static char *sccsid = "@(#)sh.set.c 1.1 92/07/30 SMI; from UCB 5.2 6/6/85";
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#endif
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#include "sh.h"
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#include "sh.tconst.h"
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/*
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* C Shell
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*/
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doset(v)
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register tchar **v;
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{
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register tchar *p;
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tchar *vp, op;
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tchar **vecp;
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bool hadsub;
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int subscr;
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#ifdef TRACE
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tprintf("TRACE- doset()\n");
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#endif
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v++;
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p = *v++;
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if (p == 0) {
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prvars();
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return;
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}
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do {
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hadsub = 0;
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for (vp = p; alnum(*p); p++)
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continue;
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if (vp == p || !letter(*vp))
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goto setsyn;
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if (*p == '[') {
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hadsub++;
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p = getinx(p, &subscr);
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}
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if (op = *p) {
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*p++ = 0;
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if (*p == 0 && *v && **v == '(')
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p = *v++;
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} else if (*v && eq(*v, S_EQ/*"="*/)) {
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op = '=', v++;
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if (*v)
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p = *v++;
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}
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if (op && op != '=')
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setsyn:
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bferr("Syntax error");
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if (eq(p, S_LPAR/*"("*/)) {
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register tchar **e = v;
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if (hadsub)
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goto setsyn;
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for (;;) {
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if (!*e)
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bferr("Missing )");
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if (**e == ')')
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break;
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e++;
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}
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p = *e;
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*e = 0;
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vecp = saveblk(v);
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set1(vp, vecp, &shvhed);
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*e = p;
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v = e + 1;
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} else if (hadsub)
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asx(vp, subscr, savestr(p));
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else
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set(vp, savestr(p));
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if (eq(vp, S_path/*"path"*/)) {
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exportpath(adrof(S_path/*"path"*/)->vec);
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dohash();
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} else if (eq(vp, S_histchars/*"histchars"*/)) {
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register tchar *p = value(S_histchars/*"histchars"*/);
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HIST = *p++;
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HISTSUB = *p;
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} else if (eq(vp, S_user/*"user"*/))
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setenv(S_USER/*"USER"*/, value(vp));
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else if (eq(vp, S_term/*"term"*/))
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setenv(S_TERM/*"TERM"*/, value(vp));
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else if (eq(vp, S_home/*"home"*/))
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setenv(S_HOME/*"HOME"*/, value(vp));
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#ifdef FILEC
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else if (eq(vp, S_filec/*"filec"*/))
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filec = 1;
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#endif
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} while (p = *v++);
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}
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tchar *
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getinx(cp, ip)
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register tchar *cp;
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register int *ip;
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{
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#ifdef TRACE
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tprintf("TRACE- getinx()\n");
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#endif
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*ip = 0;
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*cp++ = 0;
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while (*cp && digit(*cp))
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*ip = *ip * 10 + *cp++ - '0';
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if (*cp++ != ']')
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bferr("Subscript error");
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return (cp);
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}
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asx(vp, subscr, p)
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tchar *vp;
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int subscr;
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tchar *p;
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{
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register struct varent *v = getvx(vp, subscr);
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#ifdef TRACE
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tprintf("TRACE- asx()\n");
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#endif
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xfree(v->vec[subscr - 1]);
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v->vec[subscr - 1] = globone(p);
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}
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struct varent *
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getvx(vp, subscr)
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tchar *vp;
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{
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register struct varent *v = adrof(vp);
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#ifdef TRACE
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tprintf("TRACE- getvx()\n");
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#endif
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if (v == 0)
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udvar(vp);
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if (subscr < 1 || subscr > blklen(v->vec))
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bferr("Subscript out of range");
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return (v);
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}
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tchar plusplus[2] = { '1', 0 };
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dolet(v)
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tchar **v;
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{
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register tchar *p;
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tchar *vp, c, op;
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bool hadsub;
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int subscr;
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v++;
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p = *v++;
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if (p == 0) {
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prvars();
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return;
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}
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do {
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hadsub = 0;
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for (vp = p; alnum(*p); p++)
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continue;
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if (vp == p || !letter(*vp))
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goto letsyn;
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if (*p == '[') {
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hadsub++;
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p = getinx(p, &subscr);
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}
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if (*p == 0 && *v)
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p = *v++;
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if (op = *p)
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*p++ = 0;
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else
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goto letsyn;
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vp = savestr(vp);
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if (op == '=') {
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c = '=';
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p = xset(p, &v);
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} else {
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c = *p++;
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/* if (any(c, "+-")) { */
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if (c == '+' || c == '-') {
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if (c != op || *p)
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goto letsyn;
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p = plusplus;
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} else {
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/*if (any(op, "<>")) {*/
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if (op == '<' || op == '>') {
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if (c != op)
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goto letsyn;
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c = *p++;
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letsyn:
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bferr("Syntax error");
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}
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if (c != '=')
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goto letsyn;
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p = xset(p, &v);
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}
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}
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if (op == '=')
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if (hadsub)
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asx(vp, subscr, p);
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else
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set(vp, p);
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else
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if (hadsub)
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#ifndef V6
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/* avoid bug in vax CC */
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{
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struct varent *gv = getvx(vp, subscr);
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asx(vp, subscr, operate(op, gv->vec[subscr - 1], p));
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}
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#else
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asx(vp, subscr, operate(op, getvx(vp, subscr)->vec[subscr - 1], p));
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#endif
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else
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set(vp, operate(op, value(vp), p));
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if (eq(vp, S_path/*"path"*/)) {
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exportpath(adrof(S_path/*"path"*/)->vec);
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dohash();
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}
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XFREE(vp)
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if (c != '=')
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XFREE(p)
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} while (p = *v++);
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}
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tchar *
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xset(cp, vp)
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tchar *cp, ***vp;
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{
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register tchar *dp;
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#ifdef TRACE
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tprintf("TRACE- xset()\n");
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#endif
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if (*cp) {
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dp = savestr(cp);
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--(*vp);
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xfree(**vp);
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**vp = dp;
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}
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return (putn(exp(vp)));
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}
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tchar *
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operate(op, vp, p)
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tchar op, *vp, *p;
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{
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tchar opr[2];
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tchar *vec[5];
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register tchar **v = vec;
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tchar **vecp = v;
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register int i;
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if (op != '=') {
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if (*vp)
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*v++ = vp;
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opr[0] = op;
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opr[1] = 0;
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*v++ = opr;
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if (op == '<' || op == '>')
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*v++ = opr;
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}
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*v++ = p;
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*v++ = 0;
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i = exp(&vecp);
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if (*vecp)
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bferr("Expression syntax");
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return (putn(i));
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}
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static tchar *putp;
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tchar *
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putn(n)
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register int n;
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{
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static tchar number[15];
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#ifdef TRACE
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tprintf("TRACE- putn()\n");
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#endif
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putp = number;
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if (n < 0) {
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n = -n;
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*putp++ = '-';
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}
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if (sizeof (int) == 2 && n == -32768) {
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*putp++ = '3';
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n = 2768;
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#ifdef pdp11
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}
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#else
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} else if (sizeof (int) == 4 && n == -2147483648) {
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*putp++ = '2';
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n = 147483648;
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}
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#endif
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putn1(n);
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*putp = 0;
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return (savestr(number));
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}
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putn1(n)
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register int n;
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{
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#ifdef TRACE
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tprintf("TRACE- putn1()\n");
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#endif
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if (n > 9)
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putn1(n / 10);
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*putp++ = n % 10 + '0';
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}
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getn(cp)
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register tchar *cp;
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{
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register int n;
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int sign;
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#ifdef TRACE
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tprintf("TRACE- getn()\n");
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#endif
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sign = 0;
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if (cp[0] == '+' && cp[1])
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cp++;
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if (*cp == '-') {
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sign++;
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cp++;
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if (!digit(*cp))
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goto badnum;
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}
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n = 0;
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while (digit(*cp))
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n = n * 10 + *cp++ - '0';
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if (*cp)
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goto badnum;
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return (sign ? -n : n);
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badnum:
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bferr("Badly formed number");
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return (0);
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}
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tchar *
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value1(var, head)
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tchar *var;
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struct varent *head;
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{
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register struct varent *vp;
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#ifdef TRACE
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tprintf("TRACE- value1()\n");
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#endif
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vp = adrof1(var, head);
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return (vp == 0 || vp->vec[0] == 0 ? S_/*""*/ : vp->vec[0]);
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}
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struct varent *
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madrof(pat, vp)
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tchar *pat;
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register struct varent *vp;
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{
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register struct varent *vp1;
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#ifdef TRACE
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tprintf("TRACE- madrof()\n");
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#endif
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for (; vp; vp = vp->v_right) {
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if (vp->v_left && (vp1 = madrof(pat, vp->v_left)))
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return vp1;
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if (Gmatch(vp->v_name, pat))
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return vp;
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}
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return vp;
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}
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struct varent *
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adrof1(name, v)
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register tchar *name;
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register struct varent *v;
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{
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register cmp;
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#ifdef TRACE
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tprintf("TRACE- adrof1()\n");
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#endif
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v = v->v_left;
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while (v && ((cmp = *name - *v->v_name) ||
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(cmp = strcmp_(name, v->v_name))))
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if (cmp < 0)
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v = v->v_left;
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else
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v = v->v_right;
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return v;
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}
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/*
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* The caller is responsible for putting value in a safe place
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*/
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set(var, val)
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tchar *var, *val;
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{
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register tchar **vec = (tchar **) xalloc(2 * sizeof (tchar **));
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#ifdef TRACE
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tprintf("TRACE- set()\n");
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#endif
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vec[0] = onlyread(val) ? savestr(val) : val;
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vec[1] = 0;
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set1(var, vec, &shvhed);
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}
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set1(var, vec, head)
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tchar *var, **vec;
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struct varent *head;
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{
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register tchar **oldv = vec;
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#ifdef TRACE
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tprintf("TRACE- set1()\n");
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#endif
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gflag = 0; tglob(oldv);
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if (gflag) {
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vec = glob(oldv);
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if (vec == 0) {
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bferr("No match");
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blkfree(oldv);
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return;
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}
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blkfree(oldv);
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gargv = 0;
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}
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setq(var, vec, head);
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}
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setq(name, vec, p)
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tchar *name, **vec;
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register struct varent *p;
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{
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register struct varent *c;
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register f;
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#ifdef TRACE
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tprintf("TRACE- setq()\n");
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#endif
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f = 0; /* tree hangs off the header's left link */
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while (c = p->v_link[f]) {
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if ((f = *name - *c->v_name) == 0 &&
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(f = strcmp_(name, c->v_name)) == 0) {
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blkfree(c->vec);
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goto found;
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}
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p = c;
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f = f > 0;
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}
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p->v_link[f] = c = (struct varent *)xalloc(sizeof (struct varent));
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c->v_name = savestr(name);
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c->v_bal = 0;
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c->v_left = c->v_right = 0;
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c->v_parent = p;
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balance(p, f, 0);
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found:
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trim(c->vec = vec);
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}
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unset(v)
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tchar *v[];
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{
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#ifdef TRACE
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tprintf("TRACE- unset()\n");
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#endif
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unset1(v, &shvhed);
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if (adrof(S_histchars/*"histchars"*/) == 0) {
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HIST = '!';
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HISTSUB = '^';
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}
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#ifdef FILEC
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if (adrof(S_filec/*"filec"*/) == 0)
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filec = 0;
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#endif
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}
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unset1(v, head)
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register tchar *v[];
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struct varent *head;
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{
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register struct varent *vp;
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register int cnt;
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#ifdef TRACE
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tprintf("TRACE- unset1()\n");
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#endif
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while (*++v) {
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cnt = 0;
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while (vp = madrof(*v, head->v_left))
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unsetv1(vp), cnt++;
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if (cnt == 0)
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setname(*v);
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}
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}
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unsetv(var)
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tchar *var;
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{
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register struct varent *vp;
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#ifdef TRACE
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tprintf("TRACE- unsetv()\n");
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#endif
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if ((vp = adrof1(var, &shvhed)) == 0)
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udvar(var);
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unsetv1(vp);
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}
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unsetv1(p)
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register struct varent *p;
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{
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register struct varent *c, *pp;
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register f;
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#ifdef TRACE
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tprintf("TRACE- unsetv1()\n");
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#endif
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/*
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* Free associated memory first to avoid complications.
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*/
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blkfree(p->vec);
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XFREE(p->v_name);
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/*
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* If p is missing one child, then we can move the other
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* into where p is. Otherwise, we find the predecessor
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* of p, which is guaranteed to have no right child, copy
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* it into p, and move it's left child into it.
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*/
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if (p->v_right == 0)
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c = p->v_left;
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else if (p->v_left == 0)
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c = p->v_right;
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else {
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for (c = p->v_left; c->v_right; c = c->v_right)
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;
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p->v_name = c->v_name;
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p->vec = c->vec;
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p = c;
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c = p->v_left;
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}
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/*
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* Move c into where p is.
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*/
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pp = p->v_parent;
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f = pp->v_right == p;
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if (pp->v_link[f] = c)
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c->v_parent = pp;
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/*
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* Free the deleted node, and rebalance.
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*/
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XFREE( (tchar *)p);
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balance(pp, f, 1);
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}
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setNS(cp)
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tchar *cp;
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{
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#ifdef TRACE
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tprintf("TRACE- setNS()\n");
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#endif
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set(cp, S_/*""*/);
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}
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shift(v)
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register tchar **v;
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{
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register struct varent *argv;
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register tchar *name;
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#ifdef TRACE
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tprintf("TRACE- shift()\n");
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#endif
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v++;
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name = *v;
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if (name == 0)
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name = S_argv/*"argv"*/;
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else
|
|
(void) strip(name);
|
|
argv = adrof(name);
|
|
if (argv == 0)
|
|
udvar(name);
|
|
if (argv->vec[0] == 0)
|
|
bferr("No more words");
|
|
lshift(argv->vec, 1);
|
|
}
|
|
|
|
exportpath(val)
|
|
tchar **val;
|
|
{
|
|
tchar exppath[BUFSIZ];
|
|
|
|
#ifdef TRACE
|
|
tprintf("TRACE- exportpath()\n");
|
|
#endif
|
|
exppath[0] = 0;
|
|
if (val)
|
|
while (*val) {
|
|
if (strlen_(*val) + strlen_(exppath) + 2 > BUFSIZ) {
|
|
printf("Warning: ridiculously long PATH truncated\n");
|
|
break;
|
|
}
|
|
(void) strcat_(exppath, *val++);
|
|
if (*val == 0 || eq(*val, S_RPAR/*")"*/))
|
|
break;
|
|
(void) strcat_(exppath, S_COLON/*":"*/);
|
|
}
|
|
setenv(S_PATH/*"PATH"*/, exppath);
|
|
}
|
|
|
|
/* macros to do single rotations on node p */
|
|
#define rright(p) (\
|
|
t = (p)->v_left,\
|
|
(t)->v_parent = (p)->v_parent,\
|
|
((p)->v_left = t->v_right) ? (t->v_right->v_parent = (p)) : 0,\
|
|
(t->v_right = (p))->v_parent = t,\
|
|
(p) = t)
|
|
#define rleft(p) (\
|
|
t = (p)->v_right,\
|
|
(t)->v_parent = (p)->v_parent,\
|
|
((p)->v_right = t->v_left) ? (t->v_left->v_parent = (p)) : 0,\
|
|
(t->v_left = (p))->v_parent = t,\
|
|
(p) = t)
|
|
|
|
/*
|
|
* Rebalance a tree, starting at p and up.
|
|
* F == 0 means we've come from p's left child.
|
|
* D == 1 means we've just done a delete, otherwise an insert.
|
|
*/
|
|
balance(p, f, d)
|
|
register struct varent *p;
|
|
register f;
|
|
{
|
|
register struct varent *pp;
|
|
register struct varent *t; /* used by the rotate macros */
|
|
register ff;
|
|
|
|
#ifdef TRACE
|
|
tprintf("TRACE- balance()\n");
|
|
#endif
|
|
/*
|
|
* Ok, from here on, p is the node we're operating on;
|
|
* pp is it's parent; f is the branch of p from which we have come;
|
|
* ff is the branch of pp which is p.
|
|
*/
|
|
for (; pp = p->v_parent; p = pp, f = ff) {
|
|
ff = pp->v_right == p;
|
|
if (f ^ d) { /* right heavy */
|
|
switch (p->v_bal) {
|
|
case -1: /* was left heavy */
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* was balanced */
|
|
p->v_bal = 1;
|
|
break;
|
|
case 1: /* was already right heavy */
|
|
switch (p->v_right->v_bal) {
|
|
case 1: /* sigle rotate */
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal = 0;
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* single rotate */
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal = 1;
|
|
p->v_bal = -1;
|
|
break;
|
|
case -1: /* double rotate */
|
|
rright(p->v_right);
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal =
|
|
p->v_bal < 1 ? 0 : -1;
|
|
p->v_right->v_bal =
|
|
p->v_bal > -1 ? 0 : 1;
|
|
p->v_bal = 0;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
} else { /* left heavy */
|
|
switch (p->v_bal) {
|
|
case 1: /* was right heavy */
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* was balanced */
|
|
p->v_bal = -1;
|
|
break;
|
|
case -1: /* was already left heavy */
|
|
switch (p->v_left->v_bal) {
|
|
case -1: /* single rotate */
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_right->v_bal = 0;
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* signle rotate */
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_right->v_bal = -1;
|
|
p->v_bal = 1;
|
|
break;
|
|
case 1: /* double rotate */
|
|
rleft(p->v_left);
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_left->v_bal =
|
|
p->v_bal < 1 ? 0 : -1;
|
|
p->v_right->v_bal =
|
|
p->v_bal > -1 ? 0 : 1;
|
|
p->v_bal = 0;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If from insert, then we terminate when p is balanced.
|
|
* If from delete, then we terminate when p is unbalanced.
|
|
*/
|
|
if ((p->v_bal == 0) ^ d)
|
|
break;
|
|
}
|
|
}
|
|
|
|
plist(p)
|
|
register struct varent *p;
|
|
{
|
|
register struct varent *c;
|
|
register len;
|
|
|
|
#ifdef TRACE
|
|
tprintf("TRACE- plist()\n");
|
|
#endif
|
|
if (setintr)
|
|
(void) sigsetmask(sigblock(0) & ~ sigmask(SIGINT));
|
|
for (;;) {
|
|
while (p->v_left)
|
|
p = p->v_left;
|
|
x:
|
|
if (p->v_parent == 0) /* is it the header? */
|
|
return;
|
|
len = blklen(p->vec);
|
|
printf("%t", p->v_name);
|
|
putchar('\t');
|
|
if (len != 1)
|
|
putchar('(');
|
|
blkpr(p->vec);
|
|
if (len != 1)
|
|
putchar(')');
|
|
putchar('\n');
|
|
if (p->v_right) {
|
|
p = p->v_right;
|
|
continue;
|
|
}
|
|
do {
|
|
c = p;
|
|
p = p->v_parent;
|
|
} while (p->v_right == c);
|
|
goto x;
|
|
}
|
|
}
|