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Commit ea5cc87c authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by Ingo Molnar
Browse files

perf_counter tools: Add string.[ch] 



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

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 229c4eed

Documentation/perf_counter/util/string.c

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#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;

}

Documentation/perf_counter/util/string.h

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#ifndef _PERF_STRING_H_

#define _PERF_STRING_H_



#include <linux/types.h>



int hex2u64(const char *ptr, __u64 *val);



#endif