From patchwork Mon Sep 2 22:39:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "brian m. carlson" X-Patchwork-Id: 11127087 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CF1091813 for ; Mon, 2 Sep 2019 22:39:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF83721670 for ; Mon, 2 Sep 2019 22:39:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (3072-bit key) header.d=crustytoothpaste.net header.i=@crustytoothpaste.net header.b="k/MIDeiy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727787AbfIBWj4 (ORCPT ); Mon, 2 Sep 2019 18:39:56 -0400 Received: from injection.crustytoothpaste.net ([192.241.140.119]:58510 "EHLO injection.crustytoothpaste.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727635AbfIBWjy (ORCPT ); Mon, 2 Sep 2019 18:39:54 -0400 Received: from genre.crustytoothpaste.net (unknown [IPv6:2001:470:b978:101:6959:e43b:5cf6:a465]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by injection.crustytoothpaste.net (Postfix) with ESMTPSA id 89DE660FBE; Mon, 2 Sep 2019 22:39:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=crustytoothpaste.net; s=default; t=1567463992; bh=jrWBhDkJ1D78B//37wU5SAN2JFspob4KOc83NhDNEb4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Reply-To: Subject:Date:To:CC:Resent-Date:Resent-From:Resent-To:Resent-Cc: In-Reply-To:References:Content-Type:Content-Disposition; b=k/MIDeiy1Qrpvw7P/EwVPj4aNu9UuwaKNSc8VF5P1U21G4MqzodnWgs9uZf+oLfQ/ maSRXEL5ltMdpXxOcGvvN6q+K1ryfV87nH1RjWFqSM+ArfY+Ut23Iiy3KaTV8crnIa /AsFmzA15Xjw+azR3M3NF2P9OvPnnGpOwE+YPbr8m85czFGcEgpMX+CYLq3nLNCp00 qlfo05Wmj6GfRCMnB0bZxZpgjPvETGR/f1jE+zO3qj359fbf7ksS0j5vZpe+BxyOFk IUCveXH/12ij0srVziHsUOvkboSe0qLnvglKWHTAcOJbFOC6pgkvJG6Z3KpKsTZb1L 7J2KQMXdh+RaqfDH+qB23TS5JydboANHuHfe8OBATX1GNChDoJpTA/XFoOoiaANX3X Pr9CAu6NEO/3puf/p+k1uJVsyK0h0Mm4zWv+mtI6WfF9YOs2IYdnqpeYKKi07VCCmC tfSmoxb0pp2wl76ZP7aS7XpXQo3biSfMBKZlIXUGR8MiPLBs+DK From: "brian m. carlson" To: Cc: Phillip Wood , Johannes Schindelin Subject: [PATCH v6 1/2] path: add a function to check for path suffix Date: Mon, 2 Sep 2019 22:39:43 +0000 Message-Id: <20190902223944.897504-2-sandals@crustytoothpaste.net> X-Mailer: git-send-email 2.23.0.162.g0b9fbb3734 In-Reply-To: <20190902223944.897504-1-sandals@crustytoothpaste.net> References: <20190825233340.10894-1-sandals@crustytoothpaste.net> <20190902223944.897504-1-sandals@crustytoothpaste.net> MIME-Version: 1.0 X-Spam-Score: 1.994 (*) DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RDNS_NONE,SPF_FAIL,URIBL_BLOCKED Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org We have a function to strip the path suffix from a commit, but we don't have one to check for a path suffix. For a plain filename, we can use basename, but that requires an allocation, since POSIX allows it to modify its argument. Refactor strip_path_suffix into a helper function and a new function, ends_with_path_components, to meet this need. Signed-off-by: brian m. carlson --- path.c | 39 ++++++++++++++++++++++++++++++--------- path.h | 3 +++ 2 files changed, 33 insertions(+), 9 deletions(-) diff --git a/path.c b/path.c index 25e97b8c3f..e3da1f3c4e 100644 --- a/path.c +++ b/path.c @@ -1221,31 +1221,52 @@ static inline int chomp_trailing_dir_sep(const char *path, int len) } /* - * If path ends with suffix (complete path components), returns the - * part before suffix (sans trailing directory separators). - * Otherwise returns NULL. + * If path ends with suffix (complete path components), returns the offset of + * the last character in the path before the suffix (sans trailing directory + * separators), and -1 otherwise. */ -char *strip_path_suffix(const char *path, const char *suffix) +static ssize_t stripped_path_suffix_offset(const char *path, const char *suffix) { int path_len = strlen(path), suffix_len = strlen(suffix); while (suffix_len) { if (!path_len) - return NULL; + return -1; if (is_dir_sep(path[path_len - 1])) { if (!is_dir_sep(suffix[suffix_len - 1])) - return NULL; + return -1; path_len = chomp_trailing_dir_sep(path, path_len); suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); } else if (path[--path_len] != suffix[--suffix_len]) - return NULL; + return -1; } if (path_len && !is_dir_sep(path[path_len - 1])) - return NULL; - return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); + return -1; + return chomp_trailing_dir_sep(path, path_len); +} + +/* + * Returns true if the path ends with components, considering only complete path + * components, and false otherwise. + */ +int ends_with_path_components(const char *path, const char *components) +{ + return stripped_path_suffix_offset(path, components) != -1; +} + +/* + * If path ends with suffix (complete path components), returns the + * part before suffix (sans trailing directory separators). + * Otherwise returns NULL. + */ +char *strip_path_suffix(const char *path, const char *suffix) +{ + ssize_t offset = stripped_path_suffix_offset(path, suffix); + + return offset == -1 ? NULL : xstrndup(path, offset); } int daemon_avoid_alias(const char *p) diff --git a/path.h b/path.h index 2ba6ca58c8..14d6dcad16 100644 --- a/path.h +++ b/path.h @@ -193,4 +193,7 @@ const char *git_path_merge_head(struct repository *r); const char *git_path_fetch_head(struct repository *r); const char *git_path_shallow(struct repository *r); + +int ends_with_path_components(const char *path, const char *components); + #endif /* PATH_H */