linux-kernel - [tip:perfcounters/core] perf_counter tools: Add string.[ch]

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Date:	Tue, 2 Jun 2009 01:45:34 GMT
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter tools: Add string.[ch]

Commit-ID:  ea5cc87c63b49c133d15ec2911bb2e49e8124516
Gitweb:     http://git.kernel.org/tip/ea5cc87c63b49c133d15ec2911bb2e49e8124516
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 1 Jun 2009 22:31:03 -0300
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 2 Jun 2009 03:40:42 +0200

perf_counter tools: Add string.[ch]

Add hex conversion libraries. We are going to replace sscanf()
uses with them.

Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 Documentation/perf_counter/util/string.c |   34 ++++++++++++++++++++++++++++++
 Documentation/perf_counter/util/string.h |    8 +++++++
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/Documentation/perf_counter/util/string.c b/Documentation/perf_counter/util/string.c
new file mode 100644
index 0000000..ec33c0c
--- /dev/null
+++ b/Documentation/perf_counter/util/string.c
@@ -0,0 +1,34 @@
+#include "string.h"
+
+static int hex(char ch)
+{
+	if ((ch >= '0') && (ch <= '9'))
+		return ch - '0';
+	if ((ch >= 'a') && (ch <= 'f'))
+		return ch - 'a' + 10;
+	if ((ch >= 'A') && (ch <= 'F'))
+		return ch - 'A' + 10;
+	return -1;
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int hex2u64(const char *ptr, __u64 *long_val)
+{
+	const char *p = ptr;
+	*long_val = 0;
+
+	while (*p) {
+		const int hex_val = hex(*p);
+
+		if (hex_val < 0)
+			break;
+
+		*long_val = (*long_val << 4) | hex_val;
+		p++;
+	}
+
+	return p - ptr;
+}
diff --git a/Documentation/perf_counter/util/string.h b/Documentation/perf_counter/util/string.h
new file mode 100644
index 0000000..72812c1
--- /dev/null
+++ b/Documentation/perf_counter/util/string.h
@@ -0,0 +1,8 @@
+#ifndef _PERF_STRING_H_
+#define _PERF_STRING_H_
+
+#include <linux/types.h>
+
+int hex2u64(const char *ptr, __u64 *val);
+
+#endif
--
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