From 984e353160593b20d1e2944e1f2e9ce2117c8490 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Sun, 22 Aug 2004 15:39:56 +0000
Subject: PowerPC Linux support from ericvh. Mainly adding va_copy/va_end. Also
 fix bug in sprint wrapping around top of memory.

---
 src/lib9/fmt/sprint.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/lib9/fmt/sprint.c')

diff --git a/src/lib9/fmt/sprint.c b/src/lib9/fmt/sprint.c
index 57150c36..ac68851b 100644
--- a/src/lib9/fmt/sprint.c
+++ b/src/lib9/fmt/sprint.c
@@ -18,10 +18,19 @@ int
 sprint(char *buf, char *fmt, ...)
 {
 	int n;
+	uint len;
 	va_list args;
 
+	len = 1<<30;  /* big number, but sprint is deprecated anyway */
+	/*
+	 * on PowerPC, the stack is near the top of memory, so
+	 * we must be sure not to overflow a 32-bit pointer.
+	 */
+	if(buf+len < buf)
+		len = -(uint)buf-1;
+
 	va_start(args, fmt);
-	n = vsnprint(buf, 65536, fmt, args);	/* big number, but sprint is deprecated anyway */
+	n = vsnprint(buf, len, fmt, args);
 	va_end(args);
 	return n;
 }
-- 
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