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Do not injest register on empty put_reg

This commit is contained in:
Devine Lu Linvega 2024-04-20 11:09:43 -07:00
parent 6a61088a70
commit f139f3218e
1 changed files with 3 additions and 8 deletions
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11
src/modal.c
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@ -48,12 +48,7 @@ set_reg(int r, char *b)
static void
put_reg(char r)
{
char c, *s = regs[(int)r], *ss;
if(!s) {
*dst_++ = '?', *dst_++ = r;
return;
}
ss = walk(s);
char c, *s = regs[(int)r], *ss = walk(s);
if(r == '*') {
int i, depth = 0;
if(*s == '(') { /* special explode tuple */
@ -142,7 +137,7 @@ write_rule(Rule *r, char last, char *res)
{
char c, *b = r->b, *origin = dst_;
while((c = *b++))
if(spacer(last) && c == '?')
if(spacer(last) && c == '?' && regs[(int)*b])
put_reg(*b++);
else
*dst_++ = c, last = c;
@ -222,7 +217,7 @@ main(int argc, char **argv)
return !printf("usage: modal [-vqn] source.modal\n");
for(i = 1; i < argc && *argv[i] == '-'; i++) {
switch(argv[i][1]) {
case 'v': /* version */ return !printf("Modal Interpreter, 19 Apr 2024.\n");
case 'v': /* version */ return !printf("Modal Interpreter, 20 Apr 2024.\n");
case 'q': /* quiet */ fclose(stderr); break;
case 'n': /* infinite */ cycles = 0xffffffff; break;
}