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Date: Tue, 12 Mar 2019 20:32:05 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] setvbuf: return failure if mode is invalid
On Tue, Mar 12, 2019 at 03:31:22PM -0500, A. Wilcox wrote:
> 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;
> --
> 2.19.2
Thanks; will commit. FWIW this seems to be a C requirement not
specific to POSIX.
Rich
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