From patchwork Wed Jul 31 18:32:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 815809 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4BD7376F1; Wed, 31 Jul 2024 18:32:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722450760; cv=none; b=H4spv3XUU4k90/ErbLchYnR4zHQeyk7nQcVqx/Ax/TK9Y2HHNEoT+859+vS1DYvguAuYFhXcZr5oaTJmNurL0oju5BqXxCIOWgQ8a7zrkFj0U/ZI6UCSW8e2N5a7UQlfYDfYzEd5pwXXFW2Gj7oiic+oapdcIcBAaHU6bGSVF7Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722450760; c=relaxed/simple; bh=4M9s9OEh7nIvlxiEHReQEzcVjYytheID7Gh0tJI5QY4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AKvoB10nnyNpPN2/2Oy+d5PK7u5YsNWXEloukY/hzhAUabfgKS4pB+Vk1+WGVz7ePmGQdX0OFHEnZ5fgqaLPxPMRZbKXTxjnJSwDHmJyH0UbWdvV3SATRmlPOqj9MMJTtv+4/quedwXEVxZ4LKtAeIOq4ocRdJLO+s6yb5AYQZk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=p/9kJcMx; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="p/9kJcMx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1722450753; bh=4M9s9OEh7nIvlxiEHReQEzcVjYytheID7Gh0tJI5QY4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=p/9kJcMxLQxNt8HsEiaXyIPhbKM7VB/BGEN+ci/URg2tnOhRL4ZbZO7vH0N68a2ma 7P/cGd+3u2LezKJ+kUH0msrtOhl33hy1thIO89DHRGDEYhHrttib8QV8psrjeyvCcB e8RM1jMpnWAnN0R9ng3RhFNF/6WqvcU9SDt53PdQ= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Wed, 31 Jul 2024 20:32:07 +0200 Subject: [PATCH 1/2] tools/nolibc: add support for [v]sscanf() Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240731-nolibc-scanf-v1-1-f71bcc4abb9e@weissschuh.net> References: <20240731-nolibc-scanf-v1-0-f71bcc4abb9e@weissschuh.net> In-Reply-To: <20240731-nolibc-scanf-v1-0-f71bcc4abb9e@weissschuh.net> To: Willy Tarreau , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1722450752; l=4543; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=4M9s9OEh7nIvlxiEHReQEzcVjYytheID7Gh0tJI5QY4=; b=92ALCUV21ClawaK5mx0eDPz91mg1SI/YXhm2pJMHId/NtertpyQXKPTZytzi6Xi9dqlf/sYQJ doErh1gDrOnDp+MnbclmhU1q7ZhA7z8sRwIZWcKDM+IKpGqB3r5640Q X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= The implementation is limited and only supports numeric arguments. Signed-off-by: Thomas Weißschuh --- tools/include/nolibc/stdio.h | 93 ++++++++++++++++++++++++++++ tools/testing/selftests/nolibc/nolibc-test.c | 59 ++++++++++++++++++ 2 files changed, 152 insertions(+) diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index c968dbbc4ef8..d63c45c06d8e 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -348,6 +348,99 @@ int printf(const char *fmt, ...) return ret; } +static __attribute__((unused)) +int vsscanf(const char *str, const char *format, va_list args) +{ + uintmax_t uval; + intmax_t ival; + int base; + char *endptr; + int matches; + int lpref; + + matches = 0; + + while (1) { + if (*format == '%') { + lpref = 0; + format++; + + if (*format == 'l') { + lpref = 1; + format++; + if (*format == 'l') { + lpref = 2; + format++; + } + } + + if (*format == '%') { + if ('%' != *str) + goto done; + str++; + format++; + continue; + } else if (*format == 'd') { + ival = strtoll(str, &endptr, 10); + if (lpref == 0) + *va_arg(args, int *) = ival; + else if (lpref == 1) + *va_arg(args, long *) = ival; + else if (lpref == 2) + *va_arg(args, long long *) = ival; + } else if (*format == 'u' || *format == 'x' || *format == 'X') { + base = *format == 'u' ? 10 : 16; + uval = strtoull(str, &endptr, base); + if (lpref == 0) + *va_arg(args, unsigned int *) = uval; + else if (lpref == 1) + *va_arg(args, unsigned long *) = uval; + else if (lpref == 2) + *va_arg(args, unsigned long long *) = uval; + } else if (*format == 'p') { + *va_arg(args, void **) = (void *)strtoul(str, &endptr, 16); + } else { + SET_ERRNO(EILSEQ); + goto done; + } + + format++; + str = endptr; + matches++; + + } else if (*format == '\0') { + goto done; + } else if (isspace(*format)) { + while (isspace(*format)) + format++; + while (isspace(*str)) + str++; + } else if (*format == *str) { + format++; + str++; + } else { + if (!matches) + matches = EOF; + goto done; + } + } + +done: + return matches; +} + +static __attribute__((unused, format(scanf, 2, 3))) +int sscanf(const char *str, const char *format, ...) +{ + va_list args; + int ret; + + va_start(args, format); + ret = vsscanf(str, format, args); + va_end(args); + return ret; +} + static __attribute__((unused)) void perror(const char *msg) { diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 093d0512f4c5..addbceb0b276 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1277,6 +1277,64 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm return ret; } +static int test_scanf(void) +{ + unsigned long long ull; + unsigned long ul; + unsigned int u; + long long ll; + long l; + void *p; + int i; + + if (sscanf("", "foo") != EOF) + return 1; + + if (sscanf("foo", "foo") != 0) + return 2; + + if (sscanf("123", "%d", &i) != 1) + return 3; + + if (i != 123) + return 4; + + if (sscanf("a123b456c0x90", "a%db%uc%p", &i, &u, &p) != 3) + return 5; + + if (i != 123) + return 6; + + if (u != 456) + return 7; + + if (p != (void *)0x90) + return 8; + + if (sscanf("a b1", "a b%d", &i) != 1) + return 9; + + if (i != 1) + return 10; + + if (sscanf("a%1", "a%%%d", &i) != 1) + return 11; + + if (i != 1) + return 12; + + if (sscanf("1|2|3|4|5|6", + "%d|%ld|%lld|%u|%lu|%llu", + &i, &l, &ll, &u, &ul, &ull) != 6) + return 13; + + if (i != 1 || l != 2 || ll != 3 || + u != 4 || ul != 5 || ull != 6) + return 14; + + return 0; +} + static int run_vfprintf(int min, int max) { int test; @@ -1298,6 +1356,7 @@ static int run_vfprintf(int min, int max) CASE_TEST(char); EXPECT_VFPRINTF(1, "c", "%c", 'c'); break; CASE_TEST(hex); EXPECT_VFPRINTF(1, "f", "%x", 0xf); break; CASE_TEST(pointer); EXPECT_VFPRINTF(3, "0x1", "%p", (void *) 0x1); break; + CASE_TEST(scanf); EXPECT_ZR(1, test_scanf()); break; case __LINE__: return ret; /* must be last */ /* note: do not set any defaults so as to permit holes above */