From 00d3d577cac8dc05e683b16bfe3dbe4a692cb172 Mon Sep 17 00:00:00 2001 From: "A. Wilcox" Date: Tue, 12 Mar 2019 15:31:22 -0500 Subject: [PATCH] setvbuf: return failure if mode is invalid POSIX requires setvbuf to return non-zero if `mode` is not one of _IONBF, _IOLBF, or _IOFBF. --- src/stdio/setvbuf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/stdio/setvbuf.c b/src/stdio/setvbuf.c index 06ea296c..523dddc8 100644 --- a/src/stdio/setvbuf.c +++ b/src/stdio/setvbuf.c @@ -12,13 +12,15 @@ int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size) if (type == _IONBF) { f->buf_size = 0; - } else { + } else if (type == _IOLBF || type == _IOFBF) { if (buf && size >= UNGET) { f->buf = (void *)(buf + UNGET); f->buf_size = size - UNGET; } if (type == _IOLBF && f->buf_size) f->lbf = '\n'; + } else { + return -1; } f->flags |= F_SVB; -- 2.25.1