Re: [PATCH] prefix_path(): Unconditionally free result of prefix_path

[Eric Sunshine <sunshine@sunshineco.com>]

On Mon, May 4, 2015 at 3:11 PM, Stefan Beller <sbeller@google.com> wrote:
> prefix_path(): Unconditionally free result of prefix_path

Slightly redundant mention of "prefix_path". Also, prevailing custom
is to drop capitalization.

> prefix_path() always returns a newly allocated string since
> d089eba (setup: sanitize absolute and funny paths in get_pathspec(),
> 2008-01-28)

I'd probably turn this sentence fragment into a proper sentence:

    As of d089eba (...), prefix_path() always returns a newly
    allocated string, so free its result unconditionally.

> Additionally the const is dropped from the pointers, so the call to
> free doesn't need a cast.

Imperative mood:

    Additionally, drop the const from variables to which the
    prefix_path() result is assigned so they can be free()'d
    without having to cast-away constness.

> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---
>
> Notes:
>     Thanks for all the suggestions!
>     They are incorporated into this version of the patch.

Thanks, this version looks much better.

FWIW, with or without addressing the very minor nits above:

Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>

> diff --git a/builtin/checkout-index.c b/builtin/checkout-index.c
> index 9ca2da1..8028c37 100644
> --- a/builtin/checkout-index.c
> +++ b/builtin/checkout-index.c
> @@ -241,7 +241,7 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
>         /* Check out named files first */
>         for (i = 0; i < argc; i++) {
>                 const char *arg = argv[i];
> -               const char *p;
> +               char *p;
>
>                 if (all)
>                         die("git checkout-index: don't mix '--all' and explicit filenames");
> @@ -249,8 +249,7 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
>                         die("git checkout-index: don't mix '--stdin' and explicit filenames");
>                 p = prefix_path(prefix, prefix_length, arg);
>                 checkout_file(p, prefix);
> -               if (p < arg || p > arg + strlen(arg))
> -                       free((char *)p);
> +               free(p);
>         }
>
>         if (read_from_stdin) {
> @@ -260,7 +259,7 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
>                         die("git checkout-index: don't mix '--all' and '--stdin'");
>
>                 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
> -                       const char *p;
> +                       char *p;
>                         if (line_termination && buf.buf[0] == '"') {
>                                 strbuf_reset(&nbuf);
>                                 if (unquote_c_style(&nbuf, buf.buf, NULL))
> @@ -269,8 +268,7 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
>                         }
>                         p = prefix_path(prefix, prefix_length, buf.buf);
>                         checkout_file(p, prefix);
> -                       if (p < buf.buf || p > buf.buf + buf.len)
> -                               free((char *)p);
> +                       free(p);
>                 }
>                 strbuf_release(&nbuf);
>                 strbuf_release(&buf);
> diff --git a/builtin/update-index.c b/builtin/update-index.c
> index 6271b54..a92eed2 100644
> --- a/builtin/update-index.c
> +++ b/builtin/update-index.c
> @@ -532,10 +532,9 @@ static int do_unresolve(int ac, const char **av,
>
>         for (i = 1; i < ac; i++) {
>                 const char *arg = av[i];
> -               const char *p = prefix_path(prefix, prefix_length, arg);
> +               char *p = prefix_path(prefix, prefix_length, arg);
>                 err |= unresolve_one(p);
> -               if (p < arg || p > arg + strlen(arg))
> -                       free((char *)p);
> +               free(p);
>         }
>         return err;
>  }
> --
> 2.4.0.rc3.16.g0ab00b9