[deliverable/linux.git] / Documentation / perf_counter / util / string.c

#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;
}
Commit	Line	Data
ea5cc87c ACM	1	#include "string.h"
	2
	3	static int hex(char ch)
	4	{
	5	if ((ch >= '0') && (ch <= '9'))
	6	return ch - '0';
	7	if ((ch >= 'a') && (ch <= 'f'))
	8	return ch - 'a' + 10;
	9	if ((ch >= 'A') && (ch <= 'F'))
	10	return ch - 'A' + 10;
	11	return -1;
	12	}
	13
	14	/*
	15	* While we find nice hex chars, build a long_val.
	16	* Return number of chars processed.
	17	*/
	18	int hex2u64(const char ptr, __u64 long_val)
	19	{
	20	const char *p = ptr;
	21	*long_val = 0;
	22
	23	while (*p) {
	24	const int hex_val = hex(*p);
	25
	26	if (hex_val < 0)
	27	break;
	28
	29	long_val = (long_val << 4) \| hex_val;
	30	p++;
	31	}
	32
	33	return p - ptr;
	34	}