354 lines
6.8 KiB
C
354 lines
6.8 KiB
C
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/*
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* Copyright (c) 1983 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)value.c 5.5 (Berkeley) 3/2/91";
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#endif /* not lint */
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#include "tip.h"
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#define MIDDLE 35
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static value_t *vlookup();
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static int col = 0;
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/*
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* Variable manipulation
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*/
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vinit()
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{
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register value_t *p;
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register char *cp;
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FILE *f;
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char file[256];
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for (p = vtable; p->v_name != NULL; p++) {
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if (p->v_type&ENVIRON)
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if (cp = getenv(p->v_name))
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p->v_value = cp;
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if (p->v_type&IREMOTE)
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number(p->v_value) = *address(p->v_value);
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}
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/*
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* Read the .tiprc file in the HOME directory
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* for sets
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*/
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strcpy(file, value(HOME));
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strcat(file, "/.tiprc");
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if ((f = fopen(file, "r")) != NULL) {
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register char *tp;
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while (fgets(file, sizeof(file)-1, f) != NULL) {
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if (vflag)
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printf("set %s", file);
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if (tp = rindex(file, '\n'))
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*tp = '\0';
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vlex(file);
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}
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fclose(f);
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}
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/*
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* To allow definition of exception prior to fork
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*/
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vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
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}
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static int vaccess();
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/*VARARGS1*/
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vassign(p, v)
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register value_t *p;
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char *v;
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{
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if (!vaccess(p->v_access, WRITE)) {
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printf("access denied\r\n");
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return;
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}
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switch (p->v_type&TMASK) {
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case STRING:
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if (p->v_value && equal(p->v_value, v))
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return;
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if (!(p->v_type&(ENVIRON|INIT)))
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free(p->v_value);
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if ((p->v_value = malloc(size(v)+1)) == NOSTR) {
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printf("out of core\r\n");
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return;
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}
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p->v_type &= ~(ENVIRON|INIT);
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strcpy(p->v_value, v);
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break;
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case NUMBER:
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if (number(p->v_value) == number(v))
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return;
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number(p->v_value) = number(v);
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break;
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case BOOL:
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if (boolean(p->v_value) == (*v != '!'))
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return;
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boolean(p->v_value) = (*v != '!');
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break;
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case CHAR:
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if (character(p->v_value) == *v)
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return;
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character(p->v_value) = *v;
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}
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p->v_access |= CHANGED;
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}
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static void vprint();
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vlex(s)
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register char *s;
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{
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register value_t *p;
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static void vtoken();
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if (equal(s, "all")) {
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for (p = vtable; p->v_name; p++)
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if (vaccess(p->v_access, READ))
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vprint(p);
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} else {
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register char *cp;
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do {
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if (cp = vinterp(s, ' '))
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cp++;
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vtoken(s);
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s = cp;
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} while (s);
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}
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if (col > 0) {
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printf("\r\n");
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col = 0;
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}
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}
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static void
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vtoken(s)
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register char *s;
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{
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register value_t *p;
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register char *cp;
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char *expand();
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if (cp = index(s, '=')) {
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*cp = '\0';
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if (p = vlookup(s)) {
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cp++;
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if (p->v_type&NUMBER)
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vassign(p, atoi(cp));
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else {
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if (strcmp(s, "record") == 0)
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cp = expand(cp);
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vassign(p, cp);
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}
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return;
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}
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} else if (cp = index(s, '?')) {
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*cp = '\0';
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if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
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vprint(p);
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return;
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}
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} else {
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if (*s != '!')
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p = vlookup(s);
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else
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p = vlookup(s+1);
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if (p != NOVAL) {
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vassign(p, s);
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return;
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}
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}
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printf("%s: unknown variable\r\n", s);
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}
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static void
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vprint(p)
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register value_t *p;
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{
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register char *cp;
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extern char *interp(), *ctrl();
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if (col > 0 && col < MIDDLE)
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while (col++ < MIDDLE)
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putchar(' ');
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col += size(p->v_name);
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switch (p->v_type&TMASK) {
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case BOOL:
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if (boolean(p->v_value) == FALSE) {
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col++;
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putchar('!');
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}
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printf("%s", p->v_name);
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break;
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case STRING:
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printf("%s=", p->v_name);
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col++;
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if (p->v_value) {
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cp = interp(p->v_value, NULL);
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col += size(cp);
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printf("%s", cp);
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}
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break;
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case NUMBER:
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col += 6;
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printf("%s=%-5d", p->v_name, number(p->v_value));
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break;
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case CHAR:
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printf("%s=", p->v_name);
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col++;
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if (p->v_value) {
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cp = ctrl(character(p->v_value));
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col += size(cp);
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printf("%s", cp);
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}
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break;
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}
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if (col >= MIDDLE) {
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col = 0;
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printf("\r\n");
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return;
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}
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}
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static int
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vaccess(mode, rw)
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register unsigned mode, rw;
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{
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if (mode & (rw<<PUBLIC))
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return (1);
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if (mode & (rw<<PRIVATE))
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return (1);
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return ((mode & (rw<<ROOT)) && getuid() == 0);
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}
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static value_t *
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vlookup(s)
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register char *s;
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{
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register value_t *p;
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for (p = vtable; p->v_name; p++)
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if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
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return (p);
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return (NULL);
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}
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char *
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vinterp(s, stop)
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register char *s;
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char stop;
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{
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register char *p = s, c;
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int num;
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while ((c = *s++) && c != stop)
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switch (c) {
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case '^':
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if (*s)
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*p++ = *s++ - 0100;
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else
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*p++ = c;
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break;
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case '\\':
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num = 0;
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c = *s++;
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if (c >= '0' && c <= '7')
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num = (num<<3)+(c-'0');
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else {
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register char *q = "n\nr\rt\tb\bf\f";
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for (; *q; q++)
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if (c == *q++) {
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*p++ = *q;
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goto cont;
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}
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*p++ = c;
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cont:
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break;
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}
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if ((c = *s++) >= '0' && c <= '7') {
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num = (num<<3)+(c-'0');
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if ((c = *s++) >= '0' && c <= '7')
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num = (num<<3)+(c-'0');
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else
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s--;
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} else
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s--;
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*p++ = num;
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break;
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default:
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*p++ = c;
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}
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*p = '\0';
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return (c == stop ? s-1 : NULL);
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}
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/*
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* assign variable s with value v (for NUMBER or STRING or CHAR types)
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*/
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vstring(s,v)
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register char *s;
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register char *v;
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{
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register value_t *p;
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char *expand();
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p = vlookup(s);
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if (p == 0)
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return (1);
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if (p->v_type&NUMBER)
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vassign(p, atoi(v));
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else {
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if (strcmp(s, "record") == 0)
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v = expand(v);
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vassign(p, v);
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}
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return (0);
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}
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