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-rw-r--r--lib9/vsnprint.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib9/vsnprint.c b/lib9/vsnprint.c
index 841d142c..3a5710cb 100644
--- a/lib9/vsnprint.c
+++ b/lib9/vsnprint.c
@@ -27,8 +27,9 @@ vsnprint(char *buf, int len, char *fmt, va_list args)
f.flush = nil;
f.farg = nil;
f.nfmt = 0;
- f.args = args;
+ va_copy(f.args, args);
dofmt(&f, fmt);
+ va_end(f.args);
*(char*)f.to = '\0';
return (char*)f.to - buf;
}