Re: [PATCH] http: cast result to FILE *

[Junio C Hamano <gitster@pobox.com>]

Dan McGregor <dan.mcgregor@usask.ca> writes:

> Commit 8dd2e88a92 ("http: support file handles for HTTP_KEEP_ERROR",
> 2019-01-10) introduced an implicit assumption that rewind, fileno, and
> fflush are functions. At least on FreeBSD fileno is not, and as such
> passing a void * failed.

I am not strongly opposed to this patch, but shouldn't you be filing
a bug report against FreeBSD instead?  The implementation is free to
define fileno(fh) as a macro, but it shouldn't force such a change
to conformant programs.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206146

> Explicitly cast result to a FILE * when using standard functions that
> may ultimately be macros.
>
> Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
> ---
>  http.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/http.c b/http.c
> index 954bebf684..8b9476b151 100644
> --- a/http.c
> +++ b/http.c
> @@ -1996,12 +1996,12 @@ static int http_request_reauth(const char *url,
>  		strbuf_reset(result);
>  		break;
>  	case HTTP_REQUEST_FILE:
> -		if (fflush(result)) {
> +		if (fflush((FILE *)result)) {
>  			error_errno("unable to flush a file");
>  			return HTTP_START_FAILED;
>  		}
> -		rewind(result);
> -		if (ftruncate(fileno(result), 0) < 0) {
> +		rewind((FILE *)result);
> +		if (ftruncate(fileno((FILE *)result), 0) < 0) {
>  			error_errno("unable to truncate a file");
>  			return HTTP_START_FAILED;
>  		}