Module: LinuxStat::Misc

Defined in:

ext/misc/integer/integer?.c

Class Method Summary

• .integer?(val) ⇒ Boolean

Class Method Details

.integer?(val) ⇒ Boolean

Returns:

• (Boolean)

# File 'ext/misc/integer/integer?.c', line 18

VALUE isNumber(VALUE obj, VALUE val) {
	// Expecting a String as input, return Qnil for any other type
	if (!RB_TYPE_P(val, T_STRING))
		return Qnil;

	char *str = StringValuePtr(val);
	size_t len = RSTRING_LEN(val);

	// If the string is empty, return false
	if (len == 0) return Qfalse;

	size_t i = 0;
	char ch = str[0];

	// If the string starts with '-', skip it but ensure there are digits after it
	if (ch == '-') {
		i = 1;
		if (i == len) return Qfalse;
	}

	// Iterate through each character to check if it's a digit
	for (; i < len; i++) {
		ch = str[i];

		if (ch < '0' || ch > '9') {
			return Qfalse;
		}
	}

	return Qtrue;
}