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Small parsing speed improvement. #273

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Small parsing speed improvement. #273

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15 changes: 12 additions & 3 deletions parse.c
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Original file line number Diff line number Diff line change
Expand Up @@ -217,16 +217,25 @@ Node *pa2stat(Node *a, Node *b, Node *c) /* pat, pat {...} */
Node *linkum(Node *a, Node *b)
{
Node *c;
static Node *prev_head, *prev_tail; /* auto-init to NULL */

if (errorflag) /* don't link things that are wrong */
return a;
if (a == NULL)
return(b);
else if (b == NULL)
return(a);
for (c = a; c->nnext != NULL; c = c->nnext)
;
c->nnext = b;

if (prev_head == a) {
prev_tail->nnext = b;
prev_tail = b;
} else {
for (c = a; c->nnext != NULL; c = c->nnext)
;
c->nnext = b;
prev_head = a;
prev_tail = b;
}
return(a);
}

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