Commit-ID: d2fb8b4151a92223da6a84006f8f248ebeb6677d
Gitweb: http://git.kernel.org/tip/d2fb8b4151a92223da6a84006f8f248ebeb6677d
Author: Hitoshi Mitake <mitake@xxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Sun, 15 Nov 2009 20:36:53 +0900
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sun, 15 Nov 2009 14:54:23 +0100
perf tools: Add new perf_atoll() function to parse string representing size in bytes
This patch modifies util/string.[ch] to add new function:
perf_atoll() to parse string representing size in bytes.
This function parses (\d+)(b|B|kb|KB|mb|MB|gb|GB) (e.g. "256MB")
and returns its numeric value. (e.g. 268435456)
Signed-off-by: Hitoshi Mitake <mitake@xxxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
LKML-Reference: <1258285013-4759-1-git-send-email-mitake@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
tools/perf/util/string.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/string.h | 1 +
2 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index 04743d3..2270435 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -1,5 +1,7 @@
#include <string.h>
+#include <stdlib.h>
#include "string.h"
+#include "util.h"
static int hex(char ch)
{
@@ -43,3 +45,85 @@ char *strxfrchar(char *s, char from, char to)
return s;
}
+
+#define K 1024LL
+/*
+ * perf_atoll()
+ * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
+ * and return its numeric value
+ */
+s64 perf_atoll(const char *str)
+{
+ unsigned int i;
+ s64 length = -1, unit = 1;
+
+ if (!isdigit(str[0]))
+ goto out_err;
+
+ for (i = 1; i < strlen(str); i++) {
+ switch (str[i]) {
+ case 'B':
+ case 'b':
+ break;
+ case 'K':
+ if (str[i + 1] != 'B')
+ goto out_err;
+ else
+ goto kilo;
+ case 'k':
+ if (str[i + 1] != 'b')
+ goto out_err;
+kilo:
+ unit = K;
+ break;
+ case 'M':
+ if (str[i + 1] != 'B')
+ goto out_err;
+ else
+ goto mega;
+ case 'm':
+ if (str[i + 1] != 'b')
+ goto out_err;
+mega:
+ unit = K * K;
+ break;
+ case 'G':
+ if (str[i + 1] != 'B')
+ goto out_err;
+ else
+ goto giga;
+ case 'g':
+ if (str[i + 1] != 'b')
+ goto out_err;
+giga:
+ unit = K * K * K;
+ break;
+ case 'T':
+ if (str[i + 1] != 'B')
+ goto out_err;
+ else
+ goto tera;
+ case 't':
+ if (str[i + 1] != 'b')
+ goto out_err;
+tera:
+ unit = K * K * K * K;
+ break;
+ case '\0': /* only specified figures */
+ unit = 1;
+ break;
+ default:
+ if (!isdigit(str[i]))
+ goto out_err;
+ break;
+ }
+ }
+
+ length = atoll(str) * unit;
+ goto out;
+
+out_err:
+ length = -1;
+out:
+ return length;
+}
diff --git a/tools/perf/util/string.h b/tools/perf/util/string.h
index 2c84bf6..e50b07f 100644
--- a/tools/perf/util/string.h
+++ b/tools/perf/util/string.h
@@ -5,6 +5,7 @@
int hex2u64(const char *ptr, u64 *val);
char *strxfrchar(char *s, char from, char to);
+s64 perf_atoll(const char *str);
#define _STR(x) #x
#define STR(x) _STR(x)
--
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