BSD 4_4 release

[unix-history] / usr / src / contrib / connectd / tip / value.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)value.c     5.1 (Berkeley) 4/30/85";
#endif not lint

#include "tip.h"

#define MIDDLE  35

static value_t *vlookup();
static int col = 0;

/*
* Variable manipulation
*/
vinit()
{
       register value_t *p;
       register char *cp;
       FILE *f;
       char file[256];

       for (p = vtable; p->v_name != NULL; p++) {
               if (p->v_type&ENVIRON)
                       if (cp = getenv(p->v_name))
                               p->v_value = cp;
               if (p->v_type&IREMOTE)
                       number(p->v_value) = *address(p->v_value);
       }
       /*
        * Read the .tiprc file in the HOME directory
        *  for sets
        */
       strcpy(file, value(HOME));
       strcat(file, "/.tiprc");
       if ((f = fopen(file, "r")) != NULL) {
               register char *tp;

               while (fgets(file, sizeof(file)-1, f) != NULL) {
                       if (vflag)
                               printf("set %s", file);
                       if (tp = rindex(file, '\n'))
                               *tp = '\0';
                       vlex(file);
               }
               fclose(f);
       }
       /*
        * To allow definition of exception prior to fork
        */
       vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
}

/*VARARGS1*/
vassign(p, v)
       register value_t *p;
       char *v;
{

       if (!vaccess(p->v_access, WRITE)) {
               printf("access denied\r\n");
               return;
       }
       switch (p->v_type&TMASK) {

       case STRING:
               if (equal(p->v_value, v))
                       return;
               if (!(p->v_type&(ENVIRON|INIT)))
                       free(p->v_value);
               if ((p->v_value = malloc(size(v)+1)) == NOSTR) {
                       printf("out of core\r\n");
                       return;
               }
               p->v_type &= ~(ENVIRON|INIT);
               strcpy(p->v_value, v);
               break;

       case NUMBER:
               if (number(p->v_value) == number(v))
                       return;
               number(p->v_value) = number(v);
               break;

       case BOOL:
               if (boolean(p->v_value) == (*v != '!'))
                       return;
               boolean(p->v_value) = (*v != '!');
               break;

       case CHAR:
               if (character(p->v_value) == *v)
                       return;
               character(p->v_value) = *v;
       }
       p->v_access |= CHANGED;
}

vlex(s)
       register char *s;
{
       register value_t *p;

       if (equal(s, "all")) {
               for (p = vtable; p->v_name; p++)
                       if (vaccess(p->v_access, READ))
                               vprint(p);
       } else {
               register char *cp;

               do {
                       if (cp = vinterp(s, ' '))
                               cp++;
                       vtoken(s);
                       s = cp;
               } while (s);
       }
       if (col > 0) {
               printf("\r\n");
               col = 0;
       }
}

static int
vtoken(s)
       register char *s;
{
       register value_t *p;
       register char *cp;
       char *expand();

       if (cp = index(s, '=')) {
               *cp = '\0';
               if (p = vlookup(s)) {
                       cp++;
                       if (p->v_type&NUMBER)
                               vassign(p, atoi(cp));
                       else {
                               if (strcmp(s, "record") == 0)
                                       cp = expand(cp);
                               vassign(p, cp);
                       }
                       return;
               }
       } else if (cp = index(s, '?')) {
               *cp = '\0';
               if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
                       vprint(p);
                       return;
               }
       } else {
               if (*s != '!')
                       p = vlookup(s);
               else
                       p = vlookup(s+1);
               if (p != NOVAL) {
                       vassign(p, s);
                       return;
               }
       }
       printf("%s: unknown variable\r\n", s);
}

static int
vprint(p)
       register value_t *p;
{
       register char *cp;
       extern char *interp(), *ctrl();

       if (col > 0 && col < MIDDLE)
               while (col++ < MIDDLE)
                       putchar(' ');
       col += size(p->v_name);
       switch (p->v_type&TMASK) {

       case BOOL:
               if (boolean(p->v_value) == FALSE) {
                       col++;
                       putchar('!');
               }
               printf("%s", p->v_name);
               break;

       case STRING:
               printf("%s=", p->v_name);
               col++;
               if (p->v_value) {
                       cp = interp(p->v_value, NULL);
                       col += size(cp);
                       printf("%s", cp);
               }
               break;

       case NUMBER:
               col += 6;
               printf("%s=%-5d", p->v_name, number(p->v_value));
               break;

       case CHAR:
               printf("%s=", p->v_name);
               col++;
               if (p->v_value) {
                       cp = ctrl(character(p->v_value));
                       col += size(cp);
                       printf("%s", cp);
               }
               break;
       }
       if (col >= MIDDLE) {
               col = 0;
               printf("\r\n");
               return;
       }
}


static int
vaccess(mode, rw)
       register unsigned mode, rw;
{
       if (mode & (rw<<PUBLIC))
               return (1);
       if (mode & (rw<<PRIVATE))
               return (1);
       return ((mode & (rw<<ROOT)) && getuid() == 0);
}

static value_t *
vlookup(s)
       register char *s;
{
       register value_t *p;

       for (p = vtable; p->v_name; p++)
               if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
                       return (p);
       return (NULL);
}

char *
vinterp(s, stop)
       register char *s;
       char stop;
{
       register char *p = s, c;
       int num;

       while ((c = *s++) && c != stop)
               switch (c) {

               case '^':
                       if (*s)
                               *p++ = *s++ - 0100;
                       else
                               *p++ = c;
                       break;

               case '\\':
                       num = 0;
                       c = *s++;
                       if (c >= '0' && c <= '7')
                               num = (num<<3)+(c-'0');
                       else {
                               register char *q = "n\nr\rt\tb\bf\f";

                               for (; *q; q++)
                                       if (c == *q++) {
                                               *p++ = *q;
                                               goto cont;
                                       }
                               *p++ = c;
                       cont:
                               break;
                       }
                       if ((c = *s++) >= '0' && c <= '7') {
                               num = (num<<3)+(c-'0');
                               if ((c = *s++) >= '0' && c <= '7')
                                       num = (num<<3)+(c-'0');
                               else
                                       s--;
                       } else
                               s--;
                       *p++ = num;
                       break;

               default:
                       *p++ = c;
               }
       *p = '\0';
       return (c == stop ? s-1 : NULL);
}

/*
* assign variable s with value v (for NUMBER or STRING or CHAR types)
*/

vstring(s,v)
       register char *s;
       register char *v;
{
       register value_t *p;
       char *expand();

       p = vlookup(s); 
       if (p == 0)
               return (1);
       if (p->v_type&NUMBER)
               vassign(p, atoi(v));
       else {
               if (strcmp(s, "record") == 0)
                       v = expand(v);
               vassign(p, v);
       }
       return (0);
}