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Commit d2fb8b41 authored by Hitoshi Mitake's avatar Hitoshi Mitake Committed by Ingo Molnar
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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: default avatarHitoshi 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: default avatarIngo Molnar <mingo@elte.hu>
parent 0ffa798d

tools/perf/util/string.c

+84 −0
Original line number Diff line number Diff line 
#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;

}

tools/perf/util/string.h

+1 −0
Original line number Diff line number Diff line
@@ -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)