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@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/Documentation/perf_counter/util/string.c b/Documentation/perf_counter/util/string.c
new file mode 100644 (file)
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 (file)
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