On 2023/05/28 18:09:00 +0200, Marc Espie <marc.espie.open...@gmail.com> wrote:
> Here's a slightly more specific diff avoiding useless stat(2)
looks fine to me, and in ports it produces a nice error message:
% chmod 600 Makefile
% make
[...]
make: don't know how to make do-extract
Stop in .
Makefile(s) that couldn't be read:
Makefile: Permission denied
so fwiw ok op@
one comment and a minor style nit below
> [...]
> Index: main.c
> ===================================================================
> RCS file: /cvs/src/usr.bin/make/main.c,v
> retrieving revision 1.129
> diff -u -p -r1.129 main.c
> --- main.c 17 Jan 2023 13:03:22 -0000 1.129
> +++ main.c 28 May 2023 16:07:45 -0000
> [...]
> +static FILE *
> +open_makefile(const char *fname)
> +{
> + FILE *stream;
> + struct unreadable *u;
> +
> + stream = fopen(fname, "r");
> + if (stream != NULL)
> + return stream;
> +
> + if (errno != ENOENT) {
> + u = emalloc(sizeof *u);
> + u->fname = strdup(fname);
it's unlikely, but strdup can fail here clobbering errno and leaving
fname NULL. estrdup() should be used instead.
> + u->errcode = errno;
> + Lst_AtEnd(&unreadable, u);
> + }
> +
> + return NULL;
> +}
> [...]
> @@ -866,7 +910,14 @@ ReadMakefile(void *p, void *q)
> name = Dir_FindFile(fname, userIncludePath);
> if (!name)
> name = Dir_FindFile(fname, systemIncludePath);
> - if (!name || !(stream = fopen(name, "r")))
> + if (!name)
> + return false;
> + /* do not try to open a file we already have, so that
> + * dump_unreadable() yields non-confusing results.
> + */
other multiline comments are spelled as
/*
* do not try to open a file we already have, so that
* dump_unreadable() yields non-confusing results.
*/
and btw thanks for adding this comment, figuring out why this was
needed wouldn't have been straightforward to me.
> + if (strcmp(name, fname) == 0)
> + return false;
> + if ((stream = open_makefile(name)) == NULL)
> return false;
> fname = name;
> /*
