perf tools: Add new perf_atoll() function to parse string representing size in bytes
Hitoshi Mitake [Sun, 15 Nov 2009 11:36:53 +0000 (20:36 +0900)]
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@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258285013-4759-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/string.c
tools/perf/util/string.h

index 04743d3..2270435 100644 (file)
@@ -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;
+}
index 2c84bf6..e50b07f 100644 (file)
@@ -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)