From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 18 Mar 2022 15:51:12 +0100 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nVDwc-00FnSZ-Uj for lore@lore.pengutronix.de; Fri, 18 Mar 2022 15:51:12 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nVDwd-0007E8-FX for lore@pengutronix.de; Fri, 18 Mar 2022 15:51:12 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=+22h3mqpnDGqSgwNv9gudB4xcEslNZKCA4fVBgrSZ40=; b=Me7cdOnTOGbboq CYrx8sTYrPSlnPUqgR3OMgNLngB9tX00VjJz2nuztUULatiDYPPfE3WoBKihg1xPQxC6YHvttUjSp MKeS3+keC/lFPOqOCSPag4U+1sDBIHD8KIdIP0akb5mScgRQ+OulcF1sm4q2jjVbhZ2ae8/YYawW3 e4bj2/ZbVPaKUNqyzYnoDmCo/l28+Zjr9Avpu9YceSUGGnjNMsckLUQpmvQ6VKfhRmBk8qaCecYL/ M7jJerCuGq+PqQrQIOB126vYgVOGx50UyWjKFY2dQfoYvJSu5Q12Mu4nVkcRoupJJzgLCV1xpekrK WXNqrBIjxFPFB00k+OOw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nVDvM-0024sO-IK; Fri, 18 Mar 2022 14:49:52 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nVDvF-0024pt-2N for barebox@lists.infradead.org; Fri, 18 Mar 2022 14:49:48 +0000 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nVDvD-0006vR-SP; Fri, 18 Mar 2022 15:49:43 +0100 Received: from afa by dude.hi.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1nVDvD-0025bD-Dg; Fri, 18 Mar 2022 15:49:43 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Fri, 18 Mar 2022 15:49:42 +0100 Message-Id: <20220318144942.498124-1-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220318_074945_139510_9098D352 X-CRM114-Status: GOOD ( 12.05 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.4 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH] libfile: implement new pread_full X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) We already have pwrite_full, add pread_full for symmetry. Signed-off-by: Ahmad Fatoum --- include/libfile.h | 1 + lib/libfile.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/libfile.h b/include/libfile.h index 3c2fe1714dcb..a353ccfa9ea9 100644 --- a/include/libfile.h +++ b/include/libfile.h @@ -2,6 +2,7 @@ #ifndef __LIBFILE_H #define __LIBFILE_H +int pread_full(int fd, void *buf, size_t size, loff_t offset); int pwrite_full(int fd, const void *buf, size_t size, loff_t offset); int write_full(int fd, const void *buf, size_t size); int read_full(int fd, void *buf, size_t size); diff --git a/lib/libfile.c b/lib/libfile.c index 6b373f05ca72..1f533133c593 100644 --- a/lib/libfile.c +++ b/lib/libfile.c @@ -75,6 +75,31 @@ int write_full(int fd, const void *buf, size_t size) } EXPORT_SYMBOL(write_full); +/* + * pread_full - read to filedescriptor at offset + * + * Like pread, but this function only returns less bytes than + * requested when the end of file is reached. + */ +int pread_full(int fd, void *buf, size_t size, loff_t offset) +{ + size_t insize = size; + int now; + + while (size) { + now = pread(fd, buf, size, offset); + if (now == 0) + break; + if (now < 0) + return now; + size -= now; + buf += now; + } + + return insize - size; +} +EXPORT_SYMBOL(pread_full); + /* * read_full - read from filedescriptor * -- 2.30.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox