+/* value.c 4.1 81/05/09 */
+#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;
+
+ if (cp = index(s, '=')) {
+ *cp = '\0';
+ if (p = vlookup(s)) {
+ cp++;
+ if (p->v_type&NUMBER)
+ vassign(p, atoi(cp));
+ else
+ 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);
+ 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);
+}
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