/*
 * Copyright 2000 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include "tip.h"

#define MIDDLE  35

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

extern char     *interp(char *);

static void     vtoken(char *);
static void     vprint(value_t *);
static int      vaccess(unsigned, unsigned);

/*
 * Variable manipulation
 */
void
vinit(void)
{
        value_t *p;
        char *cp;
        FILE *f;
        char file[1024];

        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
         */
        if ((cp = value(HOME)) == NULL)
                cp = "";
        (void) strlcpy(file, cp, sizeof (file));
        (void) strlcat(file, "/.tiprc", sizeof (file));
        if ((f = fopen(file, "r")) != NULL) {
                char *tp;

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

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

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

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

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

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

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

static void
vtoken(char *s)
{
        value_t *p;
        char *cp, *cp2;

        if (cp = strchr(s, '=')) {
                *cp = '\0';
                if (p = vlookup(s)) {
                        cp++;
                        if (p->v_type&NUMBER)
                                vassign(p, (char *)atoi(cp));
                        else {
                                if (strcmp(s, "record") == 0)
                                        if ((cp2 = expand(cp)) != NOSTR)
                                                cp = cp2;
                                vassign(p, cp);
                        }
                        return;
                }
        } else if (cp = strchr(s, '?')) {
                *cp = '\0';
                if ((p = vlookup(s)) != NULL && vaccess(p->v_access, READ)) {
                        vprint(p);
                        return;
                }
        } else {
                if (*s != '!')
                        p = vlookup(s);
                else
                        p = vlookup(s+1);
                if (p != NOVAL) {
                        if (p->v_type&BOOL)
                                vassign(p, s);
                        else
                                (void) printf("%s: no value specified\r\n", s);
                        return;
                }
        }
        (void) printf("%s: unknown variable\r\n", s);
}

static void
vprint(value_t *p)
{
        char *cp;

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

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

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

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

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


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

static value_t *
vlookup(char *s)
{
        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(char *s, char stop)
{
        char *p = s, c;
        int num;

        while ((c = *s++) != 0 && 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 {
                                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)
 */
int
vstring(char *s, char *v)
{
        value_t *p;
        char *v2;

        p = vlookup(s);
        if (p == 0)
                return (1);
        if (p->v_type&NUMBER)
                vassign(p, (char *)atoi(v));
        else {
                if (strcmp(s, "record") == 0)
                        if ((v2 = expand(v)) != NOSTR)
                                v = v2;
                vassign(p, v);
        }
        return (0);
}