tools/perf/util/units.c

Source file repositories/reference/linux-study-clean/tools/perf/util/units.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/units.c
Extension
.c
Size
1246 bytes
Lines
77
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (s) {
			unsigned long int value;
			char *endptr;

			value = strtoul(str, &endptr, 10);
			if (s != endptr)
				break;

			if (value > ULONG_MAX / i->mult)
				break;
			value *= i->mult;
			return value;
		}
		i++;
	}

	return (unsigned long) -1;
}

double convert_unit_double(double value, char *unit)
{
	*unit = ' ';

	if (value > 1000.0) {
		value /= 1000.0;
		*unit = 'K';
	}

	if (value > 1000.0) {
		value /= 1000.0;
		*unit = 'M';
	}

	if (value > 1000.0) {
		value /= 1000.0;
		*unit = 'G';
	}

	return value;
}

unsigned long convert_unit(unsigned long value, char *unit)
{
	double v = convert_unit_double((double)value, unit);

	return (unsigned long)v;
}

int unit_number__scnprintf(char *buf, size_t size, u64 n)
{
	char unit[] = "BKMG";
	int i = 0;

	while (((n / 1024) > 1) && (i < 3)) {
		n /= 1024;
		i++;
	}

	return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
}

Annotation

Implementation Notes