From d79edf98b8d3dd8c1cbf9ad1be7728e13ed7a364 Mon Sep 17 00:00:00 2001
From: Jacob Moody <moody@posixcafe.org>
Date: Tue, 21 Mar 2023 21:24:16 +0000
Subject: cpp: #pragma once support

---
 sys/src/cmd/cpp/include.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'sys/src/cmd/cpp/include.c')

diff --git a/sys/src/cmd/cpp/include.c b/sys/src/cmd/cpp/include.c
index a4e716482..347916981 100644
--- a/sys/src/cmd/cpp/include.c
+++ b/sys/src/cmd/cpp/include.c
@@ -6,12 +6,16 @@ Includelist	includelist[NINCLUDE];
 
 char	*objname;
 
+Qid	incblocked[NONCE];
+int	nblocked = 0;
+
 void
 doinclude(Tokenrow *trp)
 {
 	char fname[256], iname[256], *p;
 	Includelist *ip;
 	int angled, len, fd, i;
+	Dir *d;
 
 	trp->tp += 1;
 	if (trp->tp>=trp->lp)
@@ -87,6 +91,15 @@ doinclude(Tokenrow *trp)
 		write(1,"\n",1);
 	}
 	if (fd >= 0) {
+		d = dirfstat(fd);
+		if (d == nil)
+			error(FATAL, "Out of memory from dirfstat");
+		for (i=0; i<nblocked; i++)
+			if (incblocked[i].path == d->qid.path && incblocked[i].type == d->qid.type) {
+				free(d);
+				return;
+			}
+		free(d);
 		if (++incdepth > 20)
 			error(FATAL, "#include too deeply nested");
 		setsource((char*)newstring((uchar*)iname, strlen(iname), 0), fd, NULL);
-- 
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