git@vger.kernel.org mailing list mirror (one of many)
 help / color / mirror / code / Atom feed
From: Beat Bolli <dev+git@drbeat.li>
To: git@vger.kernel.org
Cc: gitster@pobox.com, Beat Bolli <dev+git@drbeat.li>
Subject: [PATCH 5/6] string-list.c: avoid conversion from void * to function pointer
Date: Mon,  9 Jul 2018 21:25:36 +0200	[thread overview]
Message-ID: <20180709192537.18564-6-dev+git@drbeat.li> (raw)
In-Reply-To: <20180708144342.11922-1-dev+git@drbeat.li>

ISO C forbids the conversion of void pointers to function pointers.
Introduce a context struct that encapsulates the function pointer.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
---
 string-list.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/string-list.c b/string-list.c
index a0cf0cfe88..771c455098 100644
--- a/string-list.c
+++ b/string-list.c
@@ -224,18 +224,28 @@ struct string_list_item *string_list_append(struct string_list *list,
 			list->strdup_strings ? xstrdup(string) : (char *)string);
 }
 
+/*
+ * Encapsulate the compare function pointer because ISO C99 forbids
+ * casting from void * to a function pointer and vice versa.
+ */
+struct string_list_sort_ctx
+{
+	compare_strings_fn cmp;
+};
+
 static int cmp_items(const void *a, const void *b, void *ctx)
 {
-	compare_strings_fn cmp = ctx;
+	struct string_list_sort_ctx *sort_ctx = ctx;
 	const struct string_list_item *one = a;
 	const struct string_list_item *two = b;
-	return cmp(one->string, two->string);
+	return sort_ctx->cmp(one->string, two->string);
 }
 
 void string_list_sort(struct string_list *list)
 {
-	QSORT_S(list->items, list->nr, cmp_items,
-		list->cmp ? list->cmp : strcmp);
+	struct string_list_sort_ctx sort_ctx = {list->cmp ? list->cmp : strcmp};
+
+	QSORT_S(list->items, list->nr, cmp_items, &sort_ctx);
 }
 
 struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
-- 
2.18.0.203.gfac676dfb9


  parent reply	other threads:[~2018-07-09 19:26 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-08 14:43 [RFC PATCH 0/6] Compile cleanly in pedantic mode Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 1/6] connect.h: avoid forward declaration of an enum Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 2/6] refs/refs-internal.h: " Beat Bolli
2018-07-09 18:46   ` Jeff King
2018-07-09 19:30     ` Beat Bolli
2018-07-10  2:15       ` Jeff King
2018-07-08 14:43 ` [RFC PATCH 3/6] convert.c: replace "\e" escapes with "\033" Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 4/6] sequencer.c: avoid empty statements at top level Beat Bolli
2018-07-08 20:54   ` Eric Sunshine
2018-07-08 21:17     ` Philip Oakley
2018-07-09  9:37       ` ig
2018-07-09 21:34   ` Junio C Hamano
2018-07-09 21:37     ` Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 5/6] string-list.c: avoid conversion from void * to function pointer Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 6/6] utf8.c: avoid char overflow Beat Bolli
2018-07-09 13:14   ` Johannes Schindelin
2018-07-09 14:48     ` Beat Bolli
2018-07-09 15:45       ` Beat Bolli
2018-07-09 16:33       ` Junio C Hamano
2018-07-09 17:56         ` Beat Bolli
2018-07-09 18:18         ` Junio C Hamano
2018-07-09 20:04       ` Johannes Schindelin
2018-07-09 13:40 ` [RFC PATCH 0/6] Compile cleanly in pedantic mode Johannes Schindelin
2018-07-09 16:25 ` Junio C Hamano
2018-07-09 19:25 ` [PATCH " Beat Bolli
2018-07-09 20:25   ` Beat Bolli
2018-07-09 21:45   ` Junio C Hamano
2018-07-09 21:47     ` Beat Bolli
2018-07-10  7:34     ` Beat Bolli
2018-07-11 15:42       ` Junio C Hamano
2018-07-12 13:25         ` Johannes Schindelin
2018-07-12 15:40           ` Junio C Hamano
2018-07-09 19:25 ` [PATCH 1/6] connect.h: avoid forward declaration of an enum Beat Bolli
2018-07-09 19:25 ` [PATCH 2/6] refs/refs-internal.h: " Beat Bolli
2018-07-09 19:25 ` [PATCH 3/6] convert.c: replace "\e" escapes with "\033" Beat Bolli
2018-07-09 19:25 ` [PATCH 4/6] sequencer.c: avoid empty statements at top level Beat Bolli
2018-07-09 21:37   ` Junio C Hamano
2018-07-09 19:25 ` Beat Bolli [this message]
2018-07-09 19:25 ` [PATCH 6/6] utf8.c: avoid char overflow Beat Bolli

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180709192537.18564-6-dev+git@drbeat.li \
    --to=dev+git@drbeat.li \
    --cc=git@vger.kernel.org \
    --cc=gitster@pobox.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).