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From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux@rasmusvillemoes.dk
Subject: [PATCH 05/12] parse_integer: convert scanf()
Date: Fri, 8 May 2015 21:33:48 +0300	[thread overview]
Message-ID: <20150508183348.GC9182@p183.telecom.by> (raw)
In-Reply-To: <20150508182911.GA9044@p183.telecom.by>

Remove base second guessing -- done by parse_integer() just fine.

Uniformly fix too liberal acceptance in %lu/%ld cases in the next patch.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
 lib/vsprintf.c | 36 ++++++++++--------------------------
 1 file changed, 10 insertions(+), 26 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index da39c60..6509c54 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -2470,8 +2470,6 @@ EXPORT_SYMBOL_GPL(bprintf);
 int vsscanf(const char *buf, const char *fmt, va_list args)
 {
 	const char *str = buf;
-	char *next;
-	char digit;
 	int num = 0;
 	u8 qualifier;
 	unsigned int base;
@@ -2483,6 +2481,8 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 	bool is_sign;
 
 	while (*fmt) {
+		int len;
+
 		/* skip any white space in format */
 		/* white space in format matchs any amount of
 		 * white space, including none, in the input.
@@ -2611,35 +2611,22 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 		 */
 		str = skip_spaces(str);
 
-		digit = *str;
-		if (is_sign && digit == '-')
-			digit = *(str + 1);
-
-		if (!digit
-		    || (base == 16 && !isxdigit(digit))
-		    || (base == 10 && !isdigit(digit))
-		    || (base == 8 && (!isdigit(digit) || digit > '7'))
-		    || (base == 0 && !isdigit(digit)))
-			break;
-
 		if (is_sign)
-			val.s = qualifier != 'L' ?
-				simple_strtol(str, &next, base) :
-				simple_strtoll(str, &next, base);
+			len = parse_integer(str, base, &val.s);
 		else
-			val.u = qualifier != 'L' ?
-				simple_strtoul(str, &next, base) :
-				simple_strtoull(str, &next, base);
+			len = parse_integer(str, base, &val.u);
+		if (len < 0)
+			break;
 
-		if (field_width > 0 && next - str > field_width) {
+		if (field_width > 0) {
 			if (base == 0)
 				_parse_integer_fixup_radix(str, &base);
-			while (next - str > field_width) {
+			while (len > field_width) {
 				if (is_sign)
 					val.s = div_s64(val.s, base);
 				else
 					val.u = div_u64(val.u, base);
-				--next;
+				len--;
 			}
 		}
 
@@ -2680,10 +2667,7 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 			break;
 		}
 		num++;
-
-		if (!next)
-			break;
-		str = next;
+		str += len;
 	}
 
 	return num;
-- 
2.0.4


  parent reply	other threads:[~2015-05-08 18:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-08 18:29 [PATCH 01/12] kstrto*: accept "-0" for signed conversion Alexey Dobriyan
2015-05-08 18:30 ` [PATCH 02/12] Add parse_integer() (replacement for simple_strto*()) Alexey Dobriyan
2015-05-08 20:46   ` Andrew Morton
2015-05-08 21:52     ` Rasmus Villemoes
2015-05-10 13:52     ` Alexey Dobriyan
2015-05-13 12:19       ` Alexey Dobriyan
2015-05-10 15:52   ` Noel Grandin
2015-07-09 19:28   ` Andrew Morton
2015-07-10  6:46     ` Alexey Dobriyan
2015-05-08 18:31 ` [PATCH 03/12] parse_integer: add runtime testsuite Alexey Dobriyan
2015-05-08 18:33 ` [PATCH 04/12] parse-integer: rewrite kstrto*() Alexey Dobriyan
2015-05-08 18:33 ` Alexey Dobriyan [this message]
2015-05-08 18:34 ` [PATCH 06/12] scanf: fix type range overflow Alexey Dobriyan
2015-05-08 18:35 ` [PATCH 07/12] parse_integer: convert lib/ Alexey Dobriyan
2015-05-08 18:35 ` [PATCH 08/12] parse_integer: convert mm/ Alexey Dobriyan
2015-05-08 18:36 ` [PATCH 09/12] parse_integer: convert fs/ Alexey Dobriyan
2015-05-08 18:37 ` [PATCH 10/37] parse_integer: convert fs/cachefiles/ Alexey Dobriyan
2015-05-08 18:39 ` [PATCH 11/12] parse_integer: convert ext2, ext3, ext4 Alexey Dobriyan
2015-05-08 18:40 ` [PATCH 12/12] parse_integer: convert fs/ocfs2/ Alexey Dobriyan

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